技术领域technical field
本发明涉及通信领域技术，尤其是涉及一种定时同步方法以及小基站。The present invention relates to the technology in the communication field, and in particular to a timing synchronization method and a small base station.
背景技术Background technique
在长期演进LTE(Long Term Evolution)-A Rel-12版本中，针对热点区域的增强成为一个热门课题。其中，热点区域是由多个低功率的小基站(Pico eNB，Pico eNodeB)覆盖形成多个小小区网络(SCN，Small Cell Network)。In the Long Term Evolution (Long Term Evolution)-A Rel-12 version, enhancement for hotspot areas has become a hot topic. Wherein, the hotspot area is covered by multiple low-power small base stations (Pico eNB, Pico eNodeB) to form multiple small cell networks (SCN, Small Cell Network).
由于小基站覆盖范围比宏基站(MeNB，Macro Evolved NodeB)更小，服务的用户设备(UE，User Equipment)数量也比MeNB更少，因而可以减少导频和控制信令的开销。加上，由于小基站服务的UE数量较少，有些时候甚至没有需要提供服务的UE，且由于小基站的作用是提高系统吞吐量，而不像宏基站一样需要保证覆盖，因而为了节电考虑，小基站可以被关闭或进入睡眠状态，进入睡眠状态的小基站不再为UE提供服务。Since the coverage area of the small base station is smaller than that of the macro base station (MeNB, Macro Evolved NodeB), and the number of served user equipment (UE, User Equipment) is also smaller than that of the MeNB, the overhead of pilot and control signaling can be reduced. In addition, due to the small number of UEs served by the small base station, sometimes there are no UEs that need to provide services, and because the role of the small base station is to improve the system throughput, it does not need to ensure coverage like the macro base station, so in order to save power , the small base station may be turned off or enter a sleep state, and the small base station in the sleep state no longer provides services for the UE.
在LTE时分双工(TDD，Time Division Duplex)和LTE频分双工(FDD，FrequencyDivision Duplex)系统中，为了减少小区间的干扰，小区间需要精确同步。对于没有宏覆盖的场景，小基站需要获得定时同步是一件比较困难的事情。现有的用于家庭基站(HeNB，Home Evolved NodeB)的最常用的同步方法是网络监听机制(NLM，Network ListeningMechanism)。在NLM中，小基站使用网络监听从另一个基站处获得同步，与该上级同步基站保持同步，如果小基站无法直接从另一个基站处获得同步则需要经过多个节点转发从较远的基站处获得同步；但是在定时同步的过程中，当上级同步基站无法用于定时同步时，小基站需要耗费一定的时间重新进行同步源的搜索，在这段时间内无法为UE提供服务，且以小基站为上级同步基站的那些基站也无法进行定时同步而获得稳定的同步源。In LTE Time Division Duplex (TDD, Time Division Duplex) and LTE Frequency Division Duplex (FDD, Frequency Division Duplex) systems, in order to reduce inter-cell interference, precise synchronization is required between cells. For scenarios without macro coverage, it is difficult for small base stations to obtain timing synchronization. The most common synchronization method currently used for a home base station (HeNB, Home Evolved NodeB) is a network listening mechanism (NLM, Network Listening Mechanism). In NLM, the small base station uses network monitoring to obtain synchronization from another base station, and maintains synchronization with the superior synchronization base station. If the small base station cannot directly obtain synchronization from another base station, it needs to be forwarded from a distant base station through multiple nodes. However, in the process of timing synchronization, when the upper-level synchronization base station cannot be used for timing synchronization, the small base station needs to spend a certain amount of time to search for the synchronization source again. During this period of time, it cannot provide services for the UE. Those base stations whose base stations are superior synchronization base stations also cannot perform timing synchronization to obtain a stable synchronization source.
发明内容Contents of the invention
本发明实施例提供了一种定时同步方法以及小基站，用于避免当同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题。Embodiments of the present invention provide a timing synchronization method and a small base station, which are used to avoid the problem that the small base station needs to search for a synchronization source again when the synchronization base station cannot be used for timing synchronization.
有鉴于此，本发明第一方面提供一种定时同步方法，包括：In view of this, the first aspect of the present invention provides a timing synchronization method, including:
确定用于定时同步的第一上级同步基站；determining a first upper-level synchronization base station for timing synchronization;
确定至少一个第二上级同步基站；determining at least one second superior synchronization base station;
若所述第二上级同步基站用于定时同步的备选，则当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；If the second upper-level synchronization base station is used as a candidate for timing synchronization, when the first upper-level synchronization base station cannot be used for timing synchronization, use the second upper-level synchronization base station to perform timing synchronization;
若所述第二上级同步基站也用于定时同步，则利用所述第一上级同步基站和/或所述第二上级同步基站进行定时同步。If the second upper-level synchronization base station is also used for timing synchronization, use the first higher-level synchronization base station and/or the second upper-level synchronization base station to perform timing synchronization.
在第一方面的第一种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述第二上级同步基站基于如下方式确定：In a first possible implementation manner of the first aspect, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the second upper-level synchronization base station is determined based on the following method:
确定与所述第一上级同步基站具有相同同步等级的基站为第二上级同步基站；determining that a base station having the same synchronization level as the first upper-level synchronization base station is a second upper-level synchronization base station;
或确定同步等级最高的基站为第二上级同步基站；Or determine that the base station with the highest synchronization level is the second superior synchronization base station;
或确定信号强度最大的基站为第二上级同步基站。Or determine that the base station with the highest signal strength is the second superior synchronization base station.
结合第一方面的第一种可能的实现方式，在第二种可能的实现方式中，所述确定同步等级最高的基站为第二上级同步基站，包括：With reference to the first possible implementation of the first aspect, in a second possible implementation, determining that the base station with the highest synchronization level is the second upper-level synchronization base station includes:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站时，确定同步等级最高的基站为第二上级同步基站；If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest synchronization level is the second upper-level synchronization base station;
所述确定信号强度最大的基站为第二上级同步基站，包括：The base station with the largest determined signal strength is the second superior synchronization base station, including:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station or there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station ;or
若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站时，确定信号强度最大的基站为第二上级同步基站。If it is determined that there is no base station with the same synchronization level as the first upper level synchronization base station and there are multiple base stations with the highest synchronization level, determine that the base station with the highest signal strength is the second upper level synchronization base station.
结合第一方面的第一种可能的实现方式，在第三种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述方法还包括：With reference to the first possible implementation of the first aspect, in a third possible implementation, if the second upper-level synchronization base station is used for timing synchronization options, the method further includes:
若所述第二上级同步基站无法用于定时同步或所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，基于所述第二上级同步基站的确定方式确定新的备选上级同步基站。If the second upper-level synchronization base station cannot be used for timing synchronization or the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station for timing synchronization, determine a new candidate based on the determination method of the second upper-level synchronization base station Superior synchronization base station.
在第一方面的第四种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述方法还包括：In a fourth possible implementation manner of the first aspect, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the method further includes:
若所述第一上级同步基站与所述第二上级同步基站具有不相同的同步等级，且所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，调整自身同步等级比所述第二上级同步基站的同步等级低一级，并控制以其为上级同步基站的基站对应调整同步等级。If the first upper-level synchronous base station and the second upper-level synchronous base station have different synchronization levels, and the second upper-level synchronous base station is upgraded to the current upper-level synchronization base station used for timing synchronization, adjust the self-synchronization level ratio. The synchronization level of the second upper-level synchronization base station is one level lower, and controls the base station using it as the upper-level synchronization base station to adjust the synchronization level accordingly.
结合第一方面的第一种至第四种任一可能的实现方式，在第五种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述确定至少一个第二上级同步基站之前，包括：With reference to any one of the first to fourth possible implementations of the first aspect, in a fifth possible implementation, if the second upper-level synchronization base station is used for timing synchronization options, the determining at least one Before the second superior synchronization base station, including:
设置并维护备选上级同步基站列表，所述备选上级同步基站列表中的备选上级同步基站的同步等级都相同，且都与所述第一上级同步基站的同步等级相同，或所述备选上级同步基站列表中的备选上级同步基站同步等级不同；Setting and maintaining a list of candidate upper-level synchronization base stations, where the synchronization levels of the candidate upper-level synchronization base stations in the list of candidate upper-level synchronization base stations are all the same, and are the same as the synchronization levels of the first upper-level synchronization base station, or the candidate The synchronization levels of the candidate upper-level synchronization base stations in the selected upper-level synchronization base station list are different;
所述确定至少一个第二上级同步基站为：The determining at least one second upper-level synchronization base station is:
基于所述第二上级同步基站的确定方式，确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站。Based on the determining manner of the second upper-level synchronization base station, at least one candidate upper-level synchronization base station in the candidate upper-level synchronization base station list is determined as the second upper-level synchronization base station.
在第一方面的第六种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述第一上级同步基站和第二上级同步基站基于如下方式确定：In a sixth possible implementation manner of the first aspect, if the second upper-level synchronization base station is used for timing synchronization, the first upper-level synchronization base station and the second upper-level synchronization base station are determined based on the following method:
确定至少两个具有相同同步等级的一组基站为第一上级同步基站和第二上级同步基站，且相互之间的误差在预置阈值范围内。A group of at least two base stations with the same synchronization level is determined as a first upper-level synchronization base station and a second higher-level synchronization base station, and the mutual errors are within a preset threshold range.
结合第一方面的第六种可能的实现方式，在第七种可能的实现方式中，若所述第二上级同步基站用于定时同步，第一上级同步基站和第二上级同步基站还基于如下方式确定：With reference to the sixth possible implementation of the first aspect, in a seventh possible implementation, if the second upper-level synchronization base station is used for timing synchronization, the first upper-level synchronization base station and the second upper-level synchronization base station are also based on the following Determined by:
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个同步等级最高的那组基站为第一上级同步基站和第二上级同步基站；If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine at least two groups of base stations with the highest synchronization level as the first upper-level synchronization base station and the second upper-level synchronization base station;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；Or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two groups of base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station ;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。Or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two base stations with the same upper-level synchronization base station are the first upper-level synchronization base station and the second upper-level synchronization base station Synchronize base stations.
结合第一方面的第七种可能的实现方式，在第八种可能的实现方式中，所述确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站，包括：With reference to the seventh possible implementation of the first aspect, in an eighth possible implementation, the determining that at least two groups of base stations with the highest signal strengths are the first upper-level synchronization base station and the second upper-level synchronization base station includes: :
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, determine that at least two base stations with the highest signal strength are the first an upper-level synchronization base station and a second upper-level synchronization base station;
所述确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站，包括：The determination of at least two base stations having the same upper-level synchronization base station as the first upper-level synchronization base station and the second upper-level synchronization base station includes:
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站；或If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, determine that at least two base stations with the same upper level synchronization base station are A first upper-level synchronization base station and a second upper-level synchronization base station; or
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且在多组同步等级最高的基站中有多组信号强度最大的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, and there are multiple groups of base stations with the highest signal strength among the multiple groups of base stations with the highest synchronization level, determine at least two groups with The group of base stations of the same upper level synchronization base station is the first upper level synchronization base station and the second upper level synchronization base station.
结合第一方面的第八种可能的实现方式，在第九种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述方法还包括：With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, if the second upper-level synchronization base station is used for timing synchronization, the method further includes:
获取所述第二上级同步基站发送同步信号的位置；Acquiring the location where the second upper-level synchronization base station sends the synchronization signal;
在自身相应位置上设置为多媒体广播单频网MBSFN子帧。It is set as a multimedia broadcast single frequency network (MBSFN) subframe at its corresponding position.
结合第一方面的第八种可能的实现方式，在第十种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述方法还包括：With reference to the eighth possible implementation manner of the first aspect, in a tenth possible implementation manner, if the second upper-level synchronization base station is used for timing synchronization, the method further includes:
获取所述第二上级同步基站接收其上级同步基站发送的同步信号的位置；Obtaining the location where the second upper-level synchronization base station receives the synchronization signal sent by its upper-level synchronization base station;
在自身相应位置上设置为MBSFN子帧。It is set as an MBSFN subframe at its corresponding position.
在第一方面的第十一种可能的实现方式中，所述利用所述第二上级同步基站进行定时同步，之前包括：In an eleventh possible implementation manner of the first aspect, the performing timing synchronization by using the second upper-level synchronization base station includes:
当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，When the link with the first upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization; or,
当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。When the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
在第一方面的第十二种可能的实现方式中，所述定时同步包括初始定时同步和同步跟踪。In a twelfth possible implementation manner of the first aspect, the timing synchronization includes initial timing synchronization and synchronization tracking.
本发明第二方面提供一种小基站，包括：A second aspect of the present invention provides a small base station, including:
确定模块，用于确定用于定时同步的第一上级同步基站；A determining module, configured to determine a first upper-level synchronization base station for timing synchronization;
所述确定模块，还用于确定至少一个第二上级同步基站；The determining module is further configured to determine at least one second upper-level synchronization base station;
处理模块，用于若所述第二上级同步基站用于定时同步的备选，则当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；A processing module, configured to use the second upper-level synchronization base station to perform timing synchronization when the first upper-level synchronization base station cannot be used for timing synchronization if the second upper-level synchronization base station is used as a candidate for timing synchronization;
所述处理模块，还用于若所述第二上级同步基站也用于定时同步，则利用所述第一上级同步基站和/或所述第二上级同步基站进行定时同步。The processing module is further configured to use the first upper-level synchronization base station and/or the second upper-level synchronization base station to perform timing synchronization if the second upper-level synchronization base station is also used for timing synchronization.
在第二方面的第一种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述确定模块具体基于如下方式确定所述第二上级同步基站：确定与所述第一上级同步基站具有相同同步等级的基站为第二上级同步基站；或确定同步等级最高的基站为第二上级同步基站；或确定信号强度最大的基站为第二上级同步基站。In the first possible implementation manner of the second aspect, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the determining module specifically determines the second upper-level synchronization base station based on the following method: The base stations with the same synchronization level as the first upper level synchronous base station are the second upper level synchronous base stations; or the base station with the highest synchronization level is determined to be the second upper level synchronous base station; or the base station with the highest signal strength is determined to be the second upper level synchronous base station.
结合第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述确定模块，用于确定同步等级最高的基站为第二上级同步基站具体为若确定出没有与所述第一上级同步基站具有相同同步等级的基站时，确定同步等级最高的基站为第二上级同步基站；With reference to the first possible implementation of the second aspect, in the second possible implementation, the determination module is configured to determine that the base station with the highest synchronization level is the second upper-level synchronization base station, specifically if it is determined that there is no When the first upper-level synchronization base station has base stations with the same synchronization level, determine that the base station with the highest synchronization level is the second upper-level synchronization base station;
所述确定模块，用于确定信号强度最大的基站为第二上级同步基站具体为若确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站时，确定信号强度最大的基站为第二上级同步基站。The determining module is configured to determine that the base station with the highest signal strength is the second upper-level synchronization base station, specifically if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station or there are multiple base stations that are synchronized with the first-level synchronization base station When the base station has base stations with the same synchronization level, determine that the base station with the highest signal strength is the second superior synchronization base station; or if it is determined that there is no base station with the same synchronization level as the first superior synchronization base station and there are multiple base stations with the highest synchronization level When , it is determined that the base station with the highest signal strength is the second superior synchronization base station.
结合第二方面的第一种可能的实现方式，在第三种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述确定模块还用于：With reference to the first possible implementation of the second aspect, in a third possible implementation, if the second upper-level synchronization base station is used for timing synchronization options, the determination module is further configured to:
若所述第二上级同步基站无法用于定时同步或所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，基于所述第二上级同步基站的确定方式确定新的备选上级同步基站。If the second upper-level synchronization base station cannot be used for timing synchronization or the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station for timing synchronization, determine a new candidate based on the determination method of the second upper-level synchronization base station Superior synchronization base station.
在第二方面的第四种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述小基站还包括：In a fourth possible implementation manner of the second aspect, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the small base station further includes:
调整模块，用于若所述第一上级同步基站与所述第二上级同步基站具有不相同的同步等级，且所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，调整自身同步等级比所述第二上级同步基站的同步等级低一级；An adjustment module, configured to adjust if the first upper-level synchronization base station and the second upper-level synchronization base station have different synchronization levels, and the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station used for timing synchronization. The self-synchronization level is one level lower than the synchronization level of the second superior synchronization base station;
控制模块，用于控制以所述小基站为上级同步基站的基站对应调整同步等级。A control module, configured to control a base station with the small base station as a superior synchronization base station to correspondingly adjust the synchronization level.
结合第二方面的第一种至第四种任一可能的实现方式，在第五种可能的实现方式中，若所述第二上级同步基站用于定时同步的备选，所述小基站还包括：With reference to any one of the first to fourth possible implementation manners of the second aspect, in a fifth possible implementation manner, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the small base station further include:
设置模块，用于设置并维护备选上级同步基站列表，所述备选上级同步基站列表中的备选上级同步基站同步等级都相同，且都与所述第一上级同步基站的同步等级相同，或所述备选上级同步基站列表中的备选上级同步基站同步等级不同；A setting module, configured to set and maintain a list of candidate upper-level synchronization base stations, where the synchronization levels of the candidate upper-level synchronization base stations in the list of candidate upper-level synchronization base stations are all the same, and are the same as the synchronization levels of the first upper-level synchronization base station, or the synchronization levels of the candidate upper-level synchronization base stations in the candidate upper-level synchronization base station list are different;
所述确定模块，用于确定至少一个第二上级同步基站具体为基于所述第二上级同步基站的确定方式，确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站。The determining module is configured to determine at least one second upper-level synchronous base station, specifically based on the determination method of the second upper-level synchronous base station, and determine at least one candidate upper-level synchronous base station in the list of candidate upper-level synchronous base stations as the second Superior synchronization base station.
在第二方面第六种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述确定模块基于如下方式确定所述第一上级同步基站和第二上级同步基站：确定至少两个具有相同同步等级的一组基站为所述第一上级同步基站和第二上级同步基站，且相互之间的误差在预置阈值范围内。In the sixth possible implementation manner of the second aspect, if the second upper-level synchronization base station is used for timing synchronization, the determination module determines the first upper-level synchronization base station and the second upper-level synchronization base station based on the following method: determine at least Two groups of base stations with the same synchronization level are the first upper-level synchronization base station and the second upper-level synchronization base station, and the mutual errors are within a preset threshold range.
结合第二方面的第六种可能的实现方式，在第七种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述确定模块还基于如下方式确定所述第一上级同步基站和第二上级同步基站：若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个同步等级最高的那组基站为第一上级同步基站和第二上级同步基站；或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner, if the second upper-level synchronization base station is used for timing synchronization, the determining module further determines the first upper-level synchronization base station based on the following method Synchronous base station and second superior synchronous base station: If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual error is within the preset threshold range, determine at least two base stations with the highest synchronization level as the first superior Synchronize the base station and the second superior synchronization base station; or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual error is within the preset threshold range, determine that the group of base stations with at least two signal strengths is the first An upper-level synchronous base station and a second upper-level synchronous base station; or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual error is within a preset threshold range, determine at least two groups of base stations with the same upper-level synchronous base station are the first upper-level synchronous base station and the second upper-level synchronous base station.
结合第二方面的第七种可能的实现方式，在第八种可能的实现方式中，所述确定模块，用于确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站具体为若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；With reference to the seventh possible implementation of the second aspect, in an eighth possible implementation, the determining module is configured to determine that at least two base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station. Specifically, if multiple groups of base stations with the same synchronization level are determined and the errors between them are within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, at least two groups with the highest signal strength are determined. The group of base stations is a first upper-level synchronization base station and a second upper-level synchronization base station;
所述确定模块，用于确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站具体为若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站；The determination module is used to determine that at least two base stations with the same upper-level synchronization base station are the first upper-level synchronization base station and the second upper-level synchronization base station. Specifically, if it is determined that there are multiple groups of base stations with the same synchronization level. The error is within the preset threshold range, and when there are multiple groups of base stations with the highest synchronization level, determine at least two groups of base stations with the same upper-level synchronization base station as the first higher-level synchronization base station and the second higher-level synchronization base station;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且在多组同步等级最高的基站中有多组信号强度最大的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。Or if it is determined that there are multiple groups of base stations with the same synchronization level and the errors between them are within the preset threshold range, and there are multiple groups of base stations with the highest signal strength among the multiple groups of base stations with the highest synchronization level, determine at least two The group of base stations with the same upper level synchronization base station is the first upper level synchronization base station and the second upper level synchronization base station.
结合第二方面的第八种可能的实现方式，在第九种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述小基站还包括：With reference to the eighth possible implementation manner of the second aspect, in a ninth possible implementation manner, if the second upper-level synchronization base station is used for timing synchronization, the small base station further includes:
获取模块，用于获取所述第二上级同步基站发送同步信号的位置；An acquisition module, configured to acquire the location where the second superior synchronization base station sends the synchronization signal;
所述设置模块，用于在所述小基站相应位置上设置为多媒体广播单频网MBSFN子帧。The setting module is configured to set a multimedia broadcast single frequency network (MBSFN) subframe at a corresponding position of the small base station.
结合第二方面的第八种可能的实现方式，在第十种可能的实现方式中，若所述第二上级同步基站用于定时同步，所述小基站还包括：With reference to the eighth possible implementation manner of the second aspect, in a tenth possible implementation manner, if the second upper-level synchronization base station is used for timing synchronization, the small base station further includes:
获取模块，用于获取所述第二上级同步基站接收其上级同步基站发送的同步信号的位置；An acquisition module, configured to acquire the position where the second upper-level synchronization base station receives the synchronization signal sent by its upper-level synchronization base station;
所述设置模块，用于在所述小基站相应位置上设置为MBSFN子帧。The setting module is configured to set an MBSFN subframe at a corresponding position of the small base station.
在第二方面第十一种可能的实现方式中，所述小基站还包括：In an eleventh possible implementation manner of the second aspect, the small base station further includes:
判断模块，用于当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。A judging module, configured to determine that the first upper-level synchronization base station cannot be used for timing synchronization when the link with the first upper-level synchronization base station fails; or, when the first upper-level synchronization base station and its upper-level synchronization base station link When it fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
从以上技术方案可以看出，本发明实施例提供的一种定时同步方法以及小基站，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，也用于定时同步或用于定时同步的备选，以避免当前上级同步基站无法用于定时同步时，需要重新进行同步源搜索的问题。It can be seen from the above technical solutions that the timing synchronization method and the small base station provided by the embodiment of the present invention not only determine the first upper-level synchronization base station currently used for timing synchronization, but also determine the second upper-level synchronization base station, which is also used for timing synchronization. Synchronization or an alternative for timing synchronization, so as to avoid the problem of re-searching for synchronization sources when the current superior synchronization base station cannot be used for timing synchronization.
附图说明Description of drawings
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.
图1为本发明实施例提供的一种定时同步方法的流程示意图；FIG. 1 is a schematic flowchart of a timing synchronization method provided by an embodiment of the present invention;
图2为本发明实施例提供的定时同步方法的另一流程示意图；FIG. 2 is another schematic flowchart of a timing synchronization method provided by an embodiment of the present invention;
图3为本发明实施例提供的定时同步方法的另一流程示意图；FIG. 3 is another schematic flowchart of a timing synchronization method provided by an embodiment of the present invention;
图4为本发明实施例提供的定时同步方法的另一流程示意图；FIG. 4 is another schematic flowchart of a timing synchronization method provided by an embodiment of the present invention;
图5为本发明实施例提供的小基站的结构示意图；FIG. 5 is a schematic structural diagram of a small base station provided by an embodiment of the present invention;
图6为本发明实施例提供的小基站的另一结构示意图；FIG. 6 is another schematic structural diagram of a small base station provided by an embodiment of the present invention;
图7为本发明实施例提供的小基站的另一结构示意图。FIG. 7 is another schematic structural diagram of a small base station provided by an embodiment of the present invention.
具体实施方式Detailed ways
本发明实施例提供了一种定时同步方法以及小基站，用于避免当上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题。Embodiments of the present invention provide a timing synchronization method and a small base station, which are used to avoid the problem that the small base station needs to search for a synchronization source again when an upper-level synchronization base station cannot be used for timing synchronization.
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
以下分别进行详细说明。Each will be described in detail below.
请参考图1，图1为本发明实施例提供的一种定时同步方法的流程示意图，其中，所述方法包括：Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a timing synchronization method provided by an embodiment of the present invention, wherein the method includes:
S101、确定用于定时同步的第一上级同步基站；S101. Determine a first upper-level synchronization base station for timing synchronization;
其中，本发明方法执行主体为需要定时同步的小基站，如微基站pico eNB、家庭小基站femto eNB、家庭基站HeNB等，为方便描述和理解，可简称为目标基站；所述定时同步方法可以适用于长期演进时分双工LTE TDD系统和长期演进频分双工LTE FDD系统；Wherein, the execution subject of the method of the present invention is a small base station that needs timing synchronization, such as a micro base station pico eNB, a home small base station femto eNB, a home base station HeNB, etc., for the convenience of description and understanding, it can be referred to as a target base station for short; the timing synchronization method can be Applicable to Long Term Evolution Time Division Duplex LTE TDD system and Long Term Evolution Frequency Division Duplex LTE FDD system;
S102、确定至少一个第二上级同步基站；S102. Determine at least one second upper-level synchronization base station;
可以理解的是，所述第一上级同步基站和第二上级同步基站为所述目标基站的相邻基站，其中，第一上级同步基站为目标基站当前用于定时同步的基站；另容易想到的是，所述第一上级同步基站和第二上级同步基站可以是小基站，如pico、femto、HeNB等，也可以是其他类型的基站，如全球移动通讯系统(GSM，Global System of Mobilecommunication)或码分多址(CDMA，Code Division Multiple Access)中的基站(BS，BaseStation、BTS，Base Transceiver Station)，也可以是宽带码分多址(WCDMA，WidebandCode Division Multiple Access)中的基站(NodeB)，还可以是LTE和LTE-A中的演进型基站(eNB或e-NodeB，evolutional Node B)，本发明对此不作具体限定。It can be understood that the first upper-level synchronization base station and the second upper-level synchronization base station are adjacent base stations of the target base station, wherein the first upper-level synchronization base station is a base station currently used by the target base station for timing synchronization; another easily conceivable Yes, the first upper-level synchronous base station and the second upper-level synchronous base station can be small base stations, such as pico, femto, HeNB, etc., or other types of base stations, such as Global System of Mobile Communications (GSM, Global System of Mobilecommunication) or A base station (BS, BaseStation, BTS, Base Transceiver Station) in code division multiple access (CDMA, Code Division Multiple Access), also can be a base station (NodeB) in wideband code division multiple access (WCDMA, Wideband Code Division Multiple Access), It may also be an evolved base station (eNB or e-NodeB, evolutional Node B) in LTE and LTE-A, which is not specifically limited in the present invention.
本发明实施例中可以根据具体应用场景，判定第一上级同步基站和第二上级同步基站的确定顺序，在某些实施方式中，可以先确定第一上级同步基站，再确定第二上级同步基站，在某些实施方式中，可以同时确定第一上级同步基站和第二上级同步基站，此处不作具体限定。In the embodiment of the present invention, the determination order of the first upper-level synchronous base station and the second upper-level synchronous base station can be determined according to the specific application scenario. In some implementations, the first upper-level synchronous base station can be determined first, and then the second upper-level synchronous base station can be determined. , in some implementation manners, the first upper-level synchronization base station and the second upper-level synchronization base station may be determined at the same time, which is not specifically limited here.
S103a、若所述第二上级同步基站用于定时同步的备选，则当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；S103a. If the second upper-level synchronization base station is used as a candidate for timing synchronization, when the first upper-level synchronization base station cannot be used for timing synchronization, use the second upper-level synchronization base station to perform timing synchronization;
在该实施方式下，所述第一上级同步基站为目标基站当前用于定时同步的基站，所述第二上级同步基站为当第一上级同步基站无法用于定时同步时用于定时同步的备选基站；In this embodiment, the first upper-level synchronization base station is the base station currently used for timing synchronization by the target base station, and the second upper-level synchronization base station is the backup base station for timing synchronization when the first upper-level synchronization base station cannot be used for timing synchronization. Choose a base station;
S103b、若所述第二上级同步基站也用于定时同步，则利用所述第一上级同步基站和/或所述第二上级同步基站进行定时同步。S103b. If the second upper-level synchronization base station is also used for timing synchronization, use the first upper-level synchronization base station and/or the second upper-level synchronization base station to perform timing synchronization.
在该实施方式下，所述第一上级同步基站和第二上级同步基站同为目标基站当前用于定时同步的基站，所述第一上级同步基站和第二上级同步基站可以同时为目标基站提供定时同步，也可以分时为目标基站提供定时同步，另容易想到的是，当所述第一上级同步基站和第二上级同步基站中的一个基站无法用于定时同步时，目标基站可以利用其他的可用于定时同步的基站进行定时同步。In this embodiment, the first upper-level synchronization base station and the second upper-level synchronization base station are both base stations currently used by the target base station for timing synchronization, and the first upper-level synchronization base station and the second upper-level synchronization base station can simultaneously provide the target base station with Timing synchronization can also provide timing synchronization for the target base station in time-sharing. It is also easy to imagine that when one of the first upper-level synchronization base station and the second upper-level synchronization base station cannot be used for timing synchronization, the target base station can use other The base stations that can be used for timing synchronization perform timing synchronization.
由上述可知，本发明实施例提供的一种定时同步方法，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，也用于定时同步或用于定时同步的备选，以避免当前上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题。It can be seen from the above that the timing synchronization method provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station, which is also used for timing synchronization or is used for timing synchronization. Optional, to avoid the problem that the small base station needs to search for the synchronization source again when the current superior synchronization base station cannot be used for timing synchronization.
为方便理解和描述，以下实施例分别针对第二上级同步基站用于定时同步的备选和第二上级同步基站用于定时同步这两种情况对本发明实施例提供的定时同步方法进行具体分析：For the convenience of understanding and description, the following embodiments specifically analyze the timing synchronization method provided by the embodiment of the present invention for the two cases where the second upper-level synchronization base station is used for timing synchronization and the second upper-level synchronization base station is used for timing synchronization:
若假设在本发明该实施方式中，所述第二上级同步基站用于定时同步的备选，即目标基站在搜索同步源的时候，需要确定一个当前用于定时同步的第一上级同步基站和确定至少一个用于定时同步的备选的第二上级同步基站；可参考图2，图2为本发明实施例提供的定时同步方法的另一流程示意图，其中，所述方法包括：If it is assumed that in this embodiment of the present invention, the second upper-level synchronization base station is used as a candidate for timing synchronization, that is, when the target base station searches for a synchronization source, it needs to determine a current first-level synchronization base station and Determine at least one alternative second upper-level synchronization base station for timing synchronization; refer to FIG. 2, which is another schematic flowchart of a timing synchronization method provided by an embodiment of the present invention, wherein the method includes:
S201、确定用于定时同步的第一上级同步基站；S201. Determine a first upper-level synchronization base station for timing synchronization;
S202、确定与所述第一上级同步基站具有相同同步等级的基站为第二上级同步基站；或确定同步等级最高的基站为第二上级同步基站；或确定信号强度最大的基站为第二上级同步基站。S202. Determine that the base station with the same synchronization level as the first upper-level synchronization base station is the second-level synchronization base station; or determine that the base station with the highest synchronization level is the second-level synchronization base station; or determine that the base station with the highest signal strength is the second-level synchronization base station base station.
可以理解的是，本发明实施例中信号强度可以是同步信号强度、参考信号强度、控制信号强度、数据信号强度或者这些信号的组合的信号强度叠加，此处不作具体限定。It can be understood that the signal strength in this embodiment of the present invention may be a synchronous signal strength, a reference signal strength, a control signal strength, a data signal strength, or a combined signal strength superposition of these signals, which is not specifically limited here.
可选的，在该实施方式中，所述第二上级同步基站可以基于S202的方式进行确定，也可以基于以下方式进行确定：Optionally, in this implementation manner, the second upper-level synchronization base station may determine based on the manner of S202, or may determine based on the following manner:
进一步地，所述确定同步等级最高的基站为第二上级同步基站可以包括：Further, the determining that the base station with the highest synchronization level is the second superior synchronization base station may include:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站时，确定同步等级最高的基站为第二上级同步基站；If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest synchronization level is the second upper-level synchronization base station;
所述确定信号强度最大的基站为第二上级同步基站可以包括：The determining that the base station with the highest signal strength is the second superior synchronization base station may include:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或者，若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站时，确定信号强度最大的基站为第二上级同步基站。If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station or there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station or, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station and there are multiple base stations with the highest synchronization level, determine that the base station with the highest signal strength is the second upper-level synchronization base station.
可以理解的是，优先选择与所述第一上级同步基站具有相同同步等级的基站，这样当第一上级同步基站无法用于定时同步时，目标基站可以直接使用备选的第二上级同步基站进行定时同步，且进行定时同步时不需要调整目标基站本身的同步等级，也不需要调整以目标基站为上级同步基站的那些基站的同步等级；It can be understood that the base station with the same synchronization level as the first upper-level synchronization base station is preferentially selected, so that when the first upper-level synchronization base station cannot be used for timing synchronization, the target base station can directly use an alternative second upper-level synchronization base station. Timing synchronization, and timing synchronization does not need to adjust the synchronization level of the target base station itself, nor does it need to adjust the synchronization levels of those base stations with the target base station as the upper synchronization base station;
在某些实施方式中，目标基站可以直接根据同步等级的高低确定第二上级同步基站；也可以更进一步地，在确定出没有与所述第一上级同步基站具有相同同步等级的基站的情况下，优选选择同步等级最高的基站为第二上级同步基站；另可以理解的是，同步等级最高的基站可以理解为跳数最少或节点转发次数最少的基站，这样的基站能够保证同步精度误差累积最小；In some implementations, the target base station can directly determine the second upper-level synchronization base station according to the level of the synchronization level; or further, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station , it is preferable to select the base station with the highest synchronization level as the second superior synchronization base station; it can also be understood that the base station with the highest synchronization level can be understood as the base station with the least number of hops or the least number of node forwarding times, and such a base station can guarantee the minimum accumulation of synchronization accuracy errors ;
在某些实施方式中，目标基站可以直接根据信号强度的强弱确定第二上级同步基站；也可以更进一步地，在确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站的情况下，确定信号强度最大的基站为第二上级同步基站。In some implementation manners, the target base station may directly determine the second upper-level synchronization base station according to the strength of the signal strength; When there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station; or if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station And when there are multiple base stations with the highest synchronization level, it is determined that the base station with the highest signal strength is the second upper level synchronization base station.
S203、当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；S203. When the first upper-level synchronization base station cannot be used for timing synchronization, use the second upper-level synchronization base station to perform timing synchronization;
可选地，若目标基站在确定一个用于定时同步的第一上级同步基站，和确定一个用于定时同步的备选的第二上级同步基站后，备选上级同步基站(即第二上级同步基站)可以基于以下方式进行使用：Optionally, if the target base station determines a first upper-level synchronization base station for timing synchronization and an alternative second upper-level synchronization base station for timing synchronization, the candidate upper-level synchronization base station (that is, the second upper-level synchronization base station) base station) can be used in the following ways:
在一应用场景下，若第二上级同步基站的同步等级与第一上级同步基站的同步等级相同，则当第一上级同步基站无法用于定时同步时，备选的一个第二上级同步基站升级为当前上级同步基站，以使目标基站可以快速获得一个新的上级同步基站。由于新上级同步基站(即第二上级同步基站)的同步等级与原上级同步基站(即第一上级同步基站)的同步等级相同，因而上级同步基站的变更不会引起目标基站的同步等级发生变化，目标基站可以直接使用新上级同步基站(即第二上级同步基站)进行定时同步而不需要调整自身的同步等级，也不需要调整以目标基站为上级同步基站的那些基站的同步等级。In an application scenario, if the synchronization level of the second upper-level synchronization base station is the same as that of the first-level synchronization base station, when the first-level synchronization base station cannot be used for timing synchronization, an alternative second-level synchronization base station is upgraded Synchronize the base station for the current upper level, so that the target base station can quickly obtain a new upper level synchronization base station. Since the synchronization level of the new upper-level synchronization base station (i.e., the second upper-level synchronization base station) is the same as that of the original upper-level synchronization base station (i.e., the first upper-level synchronization base station), the change of the upper-level synchronization base station will not cause the synchronization level of the target base station to change , the target base station can directly use the new upper synchronization base station (ie, the second upper synchronization base station) to perform timing synchronization without adjusting its own synchronization level, and without adjusting the synchronization levels of those base stations with the target base station as the upper synchronization base station.
在另一应用场景下，若所述第一上级同步基站与所述第二上级同步基站具有不相同的同步等级，且所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，目标基站调整其自身同步等级比所述第二上级同步基站的同步等级低一级，并控制以其为上级同步基站的基站对应调整同步等级。In another application scenario, if the first upper-level synchronization base station and the second higher-level synchronization base station have different synchronization levels, and the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station used for timing synchronization , the target base station adjusts its own synchronization level to be one level lower than the synchronization level of the second upper level synchronization base station, and controls the base station with it as the upper level synchronization base station to adjust the synchronization level accordingly.
即在该应用场景下，当原上级同步基站(即第一上级同步基站)无法用于定时同步时，备选的一个第二上级同步基站同样升级为当前上级同步基站，目标基站可以快速获得一个新的上级同步基站。但由于新上级同步基站(即第二上级同步基站)的同步等级与原上级同步基站(即第一上级同步基站)的同步等级不相同，因而上级同步基站的变更将引起目标基站的等级发生变化，此时，目标基站可以直接使用新上级同步基站(即第二上级同步基站)进行定时同步，但需要调整自身的同步等级比新上级同步基站的同步等级低一级，而那些以目标基站为上级同步基站的基站也需要对应调整同步等级。That is, in this application scenario, when the original upper-level synchronization base station (that is, the first upper-level synchronization base station) cannot be used for timing synchronization, an alternative second-level synchronization base station is also upgraded to the current upper-level synchronization base station, and the target base station can quickly obtain a New superior synchronization base station. However, since the synchronization level of the new upper-level synchronization base station (i.e., the second upper-level synchronization base station) is different from that of the original upper-level synchronization base station (i.e., the first upper-level synchronization base station), the change of the upper-level synchronization base station will cause the level of the target base station to change , at this time, the target base station can directly use the new upper-level synchronization base station (that is, the second upper-level synchronization base station) for timing synchronization, but it needs to adjust its own synchronization level to be one level lower than the synchronization level of the new upper-level synchronization base station, and those whose target base station is The base stations of the upper-level synchronization base stations also need to adjust the synchronization level accordingly.
可以理解的是，该实施方式中，备选上级同步基站(即第二上级同步基站)的使用可以适用于多个第二上级同步基站的场景，本实施例仅以一个第二上级同步基站作为备选的上级同步基站为例进行说明，并不构成对本发明的限定。It can be understood that, in this implementation manner, the use of an alternative upper-level synchronization base station (that is, the second upper-level synchronization base station) can be applied to a scenario where multiple second-level synchronization base stations are used. In this embodiment, only one second-level synchronization base station is used as the The optional superior synchronization base station is described as an example, which does not constitute a limitation of the present invention.
可选的，在所述第二上级同步基站用于定时同步的备选的实施方式中，所述定时同步方法还包括：Optionally, in an alternative implementation manner in which the second upper-level synchronization base station is used for timing synchronization, the timing synchronization method further includes:
若所述第二上级同步基站无法用于定时同步或所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，基于所述第二上级同步基站的确定方式确定新的备选上级同步基站。If the second upper-level synchronization base station cannot be used for timing synchronization or the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station for timing synchronization, determine a new candidate based on the determination method of the second upper-level synchronization base station Superior synchronization base station.
可以理解的是，在本发明该实施方式中所述目标基站始终维护着至少一个备选上级同步基站(即第二上级同步基站)。当备选上级同步基站无法用于定时同步或升级为当前用于定时同步的上级同步基站时，重新按照备选上级同步基站的选择规则选择一个新的备选上级同步基站。It can be understood that, in this embodiment of the present invention, the target base station always maintains at least one candidate upper-level synchronization base station (ie, the second upper-level synchronization base station). When the candidate upper-level synchronization base station cannot be used for timing synchronization or is upgraded to the current upper-level synchronization base station for timing synchronization, a new candidate higher-level synchronization base station is selected according to the selection rule of the candidate upper-level synchronization base station.
在本实施例中，可选的，目标基站利用所述第二上级同步基站进行定时同步(S203)之前还可以包括：当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。In this embodiment, optionally, before the target base station uses the second upper-level synchronization base station to perform timing synchronization (S203), it may further include: when the link with the first upper-level synchronization base station fails, judging that the second An upper-level synchronization base station cannot be used for timing synchronization; or, when the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
可以理解的是，目标基站与所述第一上级同步基站链路失败，例如检测到连续N次检测到失步，可以确定目标基站与所述第一上级同步基站没有同步上，所述N为预设值；其中，目标基站与所述第一上级同步基站链路失败链路失败可以是由于第一上级同步基站随机关闭，或者目标基站与第一上级同步基站之间的信道质量差等原因所导致；所述第一上级同步基站与其上级同步基站链路失败，可以是由于第一上级同步基站的上级同步基站随机关闭，或者第一上级同步基站与第一上级同步基站的上级同步基站之间的信道质量差等原因所导致，本发明对此不作具体限定。It can be understood that, if the link between the target base station and the first upper-level synchronization base station fails, for example, when out-of-synchronization is detected for N consecutive times, it can be determined that the target base station is not synchronized with the first upper-level synchronization base station, and the N is Preset value; wherein, the link failure between the target base station and the first upper-level synchronization base station may be due to the random shutdown of the first-level synchronization base station, or poor channel quality between the target base station and the first upper-level synchronization base station. Caused; the failure of the link between the first upper-level synchronization base station and its upper-level synchronization base station may be due to the random shutdown of the upper-level synchronization base station of the first upper-level synchronization base station, or the connection between the first upper-level synchronization base station and the first-level synchronization base station. It is caused by reasons such as poor channel quality, which is not specifically limited in the present invention.
另外，本发明实施方式中，所述定时同步可以包括初始定时同步和同步跟踪，其中，初始定时同步是指目标基站或目标终端入网时初次获得定时，此时需要通过扫描主/辅同步信号(PSS/SSS，Primary/Secondary Synchronization Signal)得到；同步跟踪是指在已经获得定时的基础上维持同步，通过检测公共参考信号(CRS，Common ReferenceSignal)来实现定时的微调以维持同步。In addition, in the embodiments of the present invention, the timing synchronization may include initial timing synchronization and synchronization tracking, wherein the initial timing synchronization refers to the target base station or target terminal obtaining timing for the first time when it accesses the network. At this time, it is necessary to scan the primary/secondary synchronization signal ( PSS/SSS, Primary/Secondary Synchronization Signal) obtained; synchronous tracking refers to maintaining synchronization on the basis of already obtained timing, and realizing timing fine-tuning to maintain synchronization by detecting a common reference signal (CRS, Common ReferenceSignal).
由上述可知，本发明实施例提供的一种定时同步方法，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，用于定时同步的备选，以避免当前上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用第二上级同步基站继续保持同步，减少基站和基站、用户设备(UE，User Equipment)和UE之间的干扰。It can be known from the above that the timing synchronization method provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station for timing synchronization alternatives, so as to avoid the current When the upper-level synchronization base station cannot be used for timing synchronization, the small base station needs to search for the synchronization source again, so that the second upper-level synchronization base station can be used to continue to maintain synchronization, reducing the communication between the base station and the base station, user equipment (UE, User Equipment) and UE. interference.
若假设在本发明该实施方式中，所述第二上级同步基站用于定时同步的备选，与上一实施例不同的是，该实施方式中，在所述确定至少一个第二上级同步基站之前，还包括设置并维护备选上级同步基站列表；即目标基站在搜索同步源的时候，需要确定一个当前用于定时同步的第一上级同步基站，还需要维护一个备选上级同步基站列表，容易想到的是，所述备选上级同步基站列表包括若干个备选上级同步基站；可参考图3，图3为本发明实施例提供的定时同步方法的另一流程示意图，其中，所述方法包括：If it is assumed that in this embodiment of the present invention, the second upper-level synchronization base station is used as a candidate for timing synchronization, the difference from the previous embodiment is that in this embodiment, when determining at least one second upper-level synchronization base station Previously, it also included setting and maintaining a list of alternative upper-level synchronization base stations; that is, when the target base station searches for a synchronization source, it needs to determine a first upper-level synchronization base station currently used for timing synchronization, and also needs to maintain a list of alternative upper-level synchronization base stations. It is easy to imagine that the list of candidate upper-level synchronization base stations includes several candidate upper-level synchronization base stations; refer to FIG. 3 , which is another schematic flowchart of a timing synchronization method provided by an embodiment of the present invention, wherein the method include:
S301、确定用于定时同步的第一上级同步基站；S301. Determine a first upper-level synchronization base station for timing synchronization;
S302、设置并维护备选上级同步基站列表；S302. Setting and maintaining a list of candidate upper-level synchronization base stations;
其中，所述备选上级同步基站列表中的备选上级同步基站同步等级都相同，且都与所述第一上级同步基站的同步等级相同，或者，所述备选上级同步基站列表中的备选上级同步基站同步等级不同；Wherein, the synchronization levels of the candidate upper-level synchronization base stations in the list of candidate upper-level synchronization base stations are all the same, and are the same as the synchronization level of the first upper-level synchronization base station, or, the candidate in the list of candidate upper-level synchronization base stations The synchronization level of the upper-level synchronization base station is different;
S303、确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站；S303. Determine at least one candidate upper-level synchronization base station in the candidate upper-level synchronization base station list as a second upper-level synchronization base station;
可以理解的是，在该实施方式下，可以基于上一实施例中所述第二上级同步基站的确定方式，确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站；即该实施方式中确定第二上级同步基站的方式为：确定与所述第一上级同步基站具有相同同步等级的基站为第二上级同步基站；或确定同步等级最高的基站为第二上级同步基站；或确定信号强度最大的基站为第二上级同步基站。It can be understood that, in this implementation manner, at least one candidate upper-level synchronization base station in the candidate upper-level synchronization base station list may be determined as the second-level synchronization base station based on the determination method of the second-level synchronization base station in the previous embodiment The upper-level synchronous base station; that is, the way to determine the second upper-level synchronous base station in this embodiment is: determine the base station that has the same synchronization level as the first upper-level synchronous base station as the second upper-level synchronous base station; or determine that the base station with the highest synchronization level is the first The second upper-level synchronous base station; or determine the base station with the highest signal strength as the second upper-level synchronous base station.
进一步地，所述确定同步等级最高的基站为第二上级同步基站可以包括：Further, the determining that the base station with the highest synchronization level is the second superior synchronization base station may include:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站时，确定同步等级最高的基站为第二上级同步基站；If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest synchronization level is the second upper-level synchronization base station;
所述确定信号强度最大的基站为第二上级同步基站可以包括：The determining that the base station with the highest signal strength is the second superior synchronization base station may include:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或者，若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站时，确定信号强度最大的基站为第二上级同步基站。If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station or there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station or, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station and there are multiple base stations with the highest synchronization level, determine that the base station with the highest signal strength is the second upper-level synchronization base station.
可以理解的是，在该实施方式中，无论是所述备选上级同步基站列表中的备选上级同步基站同步等级都相同的场景，还是所述备选上级同步基站列表中的备选上级同步基站同步等级不同的场景，在所述备选上级同步基站列表中选择确定至少一个备选上级同步基站为第二上级同步基站时，都可以优先选择与所述第一上级同步基站具有相同同步等级的基站，这样当第一上级同步基站无法用于定时同步时，目标基站可以直接使用备选的第二上级同步基站进行定时同步，且进行定时同步时不需要调整目标基站本身的同步等级，也不需要调整以目标基站为上级同步基站的那些基站的同步等级；It can be understood that, in this embodiment, whether it is the scenario where the synchronization levels of the candidate upper-level synchronization base stations in the candidate upper-level synchronization base station list are the same, or the candidate upper-level synchronization base station in the candidate upper-level synchronization base station list In the scenario where the synchronization levels of the base stations are different, when at least one candidate upper-level synchronization base station is selected and determined as the second upper-level synchronization base station in the list of candidate upper-level synchronization base stations, it can be preferentially selected to have the same synchronization level as the first upper-level synchronization base station In this way, when the first upper-level synchronization base station cannot be used for timing synchronization, the target base station can directly use the alternative second upper-level synchronization base station for timing synchronization, and there is no need to adjust the synchronization level of the target base station itself when performing timing synchronization. There is no need to adjust the synchronization level of those base stations with the target base station as the superior synchronization base station;
在某些实施方式中，目标基站可以直接根据同步等级的高低确定第二上级同步基站；也可以更进一步地，在确定出没有与所述第一上级同步基站具有相同同步等级的基站的情况下，优选选择同步等级最高的基站为第二上级同步基站；另可以理解的是，同步等级最高的基站可以理解为跳数最少或节点转发次数最少的基站，这样的基站能够保证同步精度误差累积最小；In some implementations, the target base station can directly determine the second upper-level synchronization base station according to the level of the synchronization level; or further, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station , it is preferable to select the base station with the highest synchronization level as the second superior synchronization base station; it can also be understood that the base station with the highest synchronization level can be understood as the base station with the least number of hops or the least number of node forwarding times, and such a base station can guarantee the minimum accumulation of synchronization accuracy errors ;
在某些实施方式中，目标基站可以直接根据信号强度的强弱确定第二上级同步基站；也可以更进一步地，在确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站的情况下，确定信号强度最大的基站为第二上级同步基站。In some implementation manners, the target base station may directly determine the second upper-level synchronization base station according to the strength of the signal strength; When there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station; or if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station And when there are multiple base stations with the highest synchronization level, it is determined that the base station with the highest signal strength is the second upper level synchronization base station.
S304、当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；S304. When the first upper-level synchronization base station cannot be used for timing synchronization, use the second upper-level synchronization base station to perform timing synchronization;
可选地，若目标基站在确定一个用于定时同步的第一上级同步基站，和从备选上级同步基站列表中确定一个用于定时同步的备选的第二上级同步基站后，第二上级同步基站可以基于以下方式进行使用：Optionally, if the target base station determines a first upper-level synchronization base station for timing synchronization and determines a candidate second-level synchronization base station for timing synchronization from the list of candidate upper-level synchronization base stations, the second upper-level synchronization base station Synchronous base stations can be used in the following ways:
在一应用场景下，当第一上级同步基站无法用于定时同步时，第二上级同步基站升级为当前上级同步基站，以使目标基站可以快速获得一个新的上级同步基站。若第二上级同步基站的同步等级与第一上级同步基站的同步等级相同，上级同步基站的变更不会引起目标基站的同步等级发生变化，目标基站可以直接使用新上级同步基站(即第二上级同步基站)进行定时同步而不需要调整自身的同步等级，也不需要调整以目标基站为上级同步基站的那些基站的同步等级。In an application scenario, when the first upper-level synchronization base station cannot be used for timing synchronization, the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station, so that the target base station can quickly obtain a new upper-level synchronization base station. If the synchronization level of the second upper-level synchronization base station is the same as that of the first-level synchronization base station, the change of the upper-level synchronization base station will not cause the synchronization level of the target base station to change, and the target base station can directly use the new upper-level synchronization base station (that is, the second-level synchronization base station). Synchronization base station) performs timing synchronization without adjusting its own synchronization level, and without adjusting the synchronization levels of those base stations whose upper level synchronization base station is the target base station.
在另一应用场景下，若所述第一上级同步基站与第二上级同步基站具有不相同的同步等级，且所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，目标基站调整其自身同步等级比所述第二上级同步基站的同步等级低一级，并控制以其为上级同步基站的基站对应调整同步等级。In another application scenario, if the first upper-level synchronization base station and the second upper-level synchronization base station have different synchronization levels, and the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station used for timing synchronization, the target The base station adjusts its own synchronization level to be one level lower than the synchronization level of the second upper level synchronization base station, and controls the base station with it as the upper level synchronization base station to adjust the synchronization level accordingly.
即在该应用场景下，当原上级同步基站(即第一上级同步基站)无法用于定时同步时，备选的一个第二上级同步基站同样升级为当前上级同步基站，目标基站可以快速获得一个新的上级同步基站。但由于新上级同步基站(即第二上级同步基站)的同步等级与原上级同步基站(即第一上级同步基站)的同步等级不相同，因而上级同步基站的变更将引起目标基站的等级发生变化，此时，目标基站可以直接使用新上级同步基站(即第二上级同步基站)进行定时同步，但需要调整自身的同步等级比新上级同步基站的同步等级低一级，而那些以目标基站为上级同步基站的基站也需要对应调整同步等级。That is, in this application scenario, when the original upper-level synchronization base station (that is, the first upper-level synchronization base station) cannot be used for timing synchronization, an alternative second-level synchronization base station is also upgraded to the current upper-level synchronization base station, and the target base station can quickly obtain a New superior synchronization base station. However, since the synchronization level of the new upper-level synchronization base station (i.e., the second upper-level synchronization base station) is different from that of the original upper-level synchronization base station (i.e., the first upper-level synchronization base station), the change of the upper-level synchronization base station will cause the level of the target base station to change , at this time, the target base station can directly use the new upper-level synchronization base station (that is, the second upper-level synchronization base station) for timing synchronization, but it needs to adjust its own synchronization level to be one level lower than the synchronization level of the new upper-level synchronization base station, and those whose target base station is The base stations of the upper-level synchronization base stations also need to adjust the synchronization level accordingly.
可以理解的是，该实施方式中，备选上级同步基站(即第二上级同步基站)的使用可以适用于多个第二上级同步基站的场景，本实施例仅以一个第二上级同步基站作为备选的上级同步基站为例进行说明，并不构成对本发明的限定。It can be understood that, in this implementation manner, the use of an alternative upper-level synchronization base station (that is, the second upper-level synchronization base station) can be applied to a scenario where multiple second-level synchronization base stations are used. In this embodiment, only one second-level synchronization base station is used as the The optional superior synchronization base station is described as an example, which does not constitute a limitation of the present invention.
需要说明的是，本发明该实施方式中，仅以基于上述第二上级同步基站的确定方式，从备选上级同步基站列表中选择至少一个备选上级同步基站作为第二上级同步基站为例子来具体实施第二上级同步基站的确定，但并不构成对本发明的限定，在某些实施方式中，备选上级同步基站列表中的备选上级同步基站可以是按照一定规则进行排序设置，所述规则可以参照上述第二上级同步基站的确定方式，即与第一上级同步基站相同同步等级的基站排在前面，与第一上级同步基站同步等级不相同的基站排在后面；同步等级小即同步等级高的基站排在前面，同步等级大即同步等级低的基站排在后面；将信号强度大的基站排在前面，信号强度小的基站排在后面。若在该实施方式中，所述备选上级同步基站列表中的备选上级同步基站按所述规则排列好后，目标基站可以确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站；在所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步。It should be noted that, in this embodiment of the present invention, only at least one candidate upper-level synchronous base station is selected from the candidate upper-level synchronous base station list as the second upper-level synchronous base station based on the determination method of the above-mentioned second upper-level synchronous base station as an example. Specifically implement the determination of the second upper-level synchronous base station, but this does not constitute a limitation to the present invention. In some implementations, the candidate upper-level synchronous base stations in the list of candidate upper-level synchronous base stations may be arranged according to certain rules. The rules can refer to the determination method of the second upper-level synchronization base station above, that is, the base stations with the same synchronization level as the first-level synchronization base station are ranked in front, and the base stations with a synchronization level different from the first-level synchronization base station are in the back; the synchronization level is small. The base stations with high level are ranked in front, and the base stations with high or low synchronization level are ranked in the back; the base stations with high signal strength are ranked in front, and the base stations with low signal strength are ranked in the back. If in this embodiment, after the candidate upper-level synchronization base stations in the candidate upper-level synchronization base station list are arranged according to the rules, the target base station can determine at least one candidate upper-level synchronization base station in the candidate upper-level synchronization base station list. The base station is a second upper-level synchronization base station; when the first upper-level synchronization base station cannot be used for timing synchronization, the second upper-level synchronization base station is used for timing synchronization.
可选的，在所述第二上级同步基站用于定时同步的备选的实施方式中，所述定时同步方法还包括：Optionally, in an alternative implementation manner in which the second upper-level synchronization base station is used for timing synchronization, the timing synchronization method further includes:
若所述第二上级同步基站无法用于定时同步或所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，基于所述第二上级同步基站的确定方式确定新的备选上级同步基站。If the second upper-level synchronization base station cannot be used for timing synchronization or the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station for timing synchronization, determine a new candidate based on the determination method of the second upper-level synchronization base station Superior synchronization base station.
可以理解的是，在本发明该实施方式中所述目标基站始终维护着一个备选上级同步基站列表。针对该可选方式，若备选上级同步基站列表中的备选上级同步基站按所述规则排列好，当备选上级同步基站列表中的第一个备选上级同步基站升级为当前的上级同步基站时，备选上级同步基站列表中的第二个备选上级同步基站升级为备选上级同步基站列表中的第一个备选上级同步基站。另容易想到的是，在该实施实施中，当备选上级同步基站列表中的备选上级同步基站无法用于定时同步时，可将该备选上级同步基站从备选上级同步基站列表中移除。It can be understood that, in this embodiment of the present invention, the target base station always maintains a list of candidate upper-level synchronization base stations. For this optional mode, if the candidate upper-level synchronization base stations in the candidate upper-level synchronization base station list are arranged according to the rules, when the first candidate upper-level synchronization base station in the candidate upper-level synchronization base station list is upgraded to the current upper-level synchronization base station When the base station is selected, the second candidate upper-level synchronization base station in the candidate upper-level synchronization base station list is upgraded to the first candidate higher-level synchronization base station in the candidate upper-level synchronization base station list. It is also easy to imagine that, in this implementation, when the candidate upper-level synchronization base station in the candidate upper-level synchronization base station list cannot be used for timing synchronization, the candidate upper-level synchronization base station can be removed from the candidate upper-level synchronization base station list. remove.
在本实施例中，可选的，目标基站利用所述第二上级同步基站进行定时同步(S304)，之前还可以包括：当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。In this embodiment, optionally, the target base station uses the second upper-level synchronization base station to perform timing synchronization (S304). The first upper-level synchronization base station cannot be used for timing synchronization; or, when the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
可以理解的是，目标基站与所述第一上级同步基站链路失败，例如检测到连续N次检测到失步，可以确定目标基站与所述第一上级同步基站没有同步上，所述N为预设值；其中，目标基站与所述第一上级同步基站链路失败链路失败可以是由于第一上级同步基站随机关闭，或者目标基站与第一上级同步基站之间的信道质量差等原因所导致；所述第一上级同步基站与其上级同步基站链路失败，可以是由于第一上级同步基站的上级同步基站随机关闭，或者第一上级同步基站与第一上级同步基站的上级同步基站之间的信道质量差等原因所导致，本发明对此不作具体限定。It can be understood that, if the link between the target base station and the first upper-level synchronization base station fails, for example, when out-of-synchronization is detected for N consecutive times, it can be determined that the target base station is not synchronized with the first upper-level synchronization base station, and the N is Preset value; wherein, the link failure between the target base station and the first upper-level synchronization base station may be due to the random shutdown of the first-level synchronization base station, or poor channel quality between the target base station and the first upper-level synchronization base station. Caused; the failure of the link between the first upper-level synchronization base station and its upper-level synchronization base station may be due to the random shutdown of the upper-level synchronization base station of the first upper-level synchronization base station, or the connection between the first upper-level synchronization base station and the first-level synchronization base station. It is caused by reasons such as poor channel quality, which is not specifically limited in the present invention.
另外，本发明实施方式中，所述定时同步可以包括初始定时同步和同步跟踪，其中，初始定时同步是指目标基站或目标终端入网时初次获得定时，此时需要通过扫描主/辅同步信号得到；同步跟踪是指在已经获得定时的基础上维持同步，通过检测公共参考信号来实现定时的微调以维持同步。In addition, in the embodiments of the present invention, the timing synchronization may include initial timing synchronization and synchronization tracking, wherein the initial timing synchronization refers to the timing obtained for the first time when the target base station or target terminal is connected to the network, and at this time it needs to scan the primary/secondary synchronization signal to obtain ; Synchronous tracking refers to maintaining synchronization on the basis of already obtained timing, and realizing timing fine-tuning by detecting common reference signals to maintain synchronization.
由上述可知，本发明实施例提供的一种定时同步方法，不仅确定当前用于定时同步的第一上级同步基站，还确定了所述备选上级同步基站列表中至少一个备选上级同步基站作为第二上级同步基站，用于定时同步的备选，以避免当前上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用第二上级同步基站继续保持同步，减少基站和基站、UE和UE之间的干扰。It can be seen from the above that the timing synchronization method provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines at least one candidate upper-level synchronization base station in the list of candidate upper-level synchronization base stations as the The second upper-level synchronization base station is used as an alternative for timing synchronization, so as to avoid the problem that the small base station needs to search for the synchronization source again when the current upper-level synchronization base station cannot be used for timing synchronization, so that the second upper-level synchronization base station can continue to maintain synchronization. Reduce base station to base station, UE to UE interference.
若假设在本发明该实施方式中，所述第二上级同步基站也用于定时同步，即目标基站在搜索同步源的时候，需要确定至少两个当前用于定时同步上级同步基站，分别是一个第一上级同步基站和至少一个第二上级同步基站；可参考图4，图4为本发明实施例提供的定时同步方法的另一流程示意图，其中，所述方法包括：If it is assumed that in this embodiment of the present invention, the second upper-level synchronization base station is also used for timing synchronization, that is, when the target base station searches for a synchronization source, it needs to determine at least two upper-level synchronization base stations currently used for timing synchronization. A first upper-level synchronous base station and at least one second upper-level synchronous base station; refer to FIG. 4, which is another schematic flowchart of a timing synchronization method provided by an embodiment of the present invention, wherein the method includes:
S401、确定至少两个具有相同同步等级的一组基站为第一上级同步基站和第二上级同步基站，且相互之间的误差在预置阈值范围内。S401. Determine a group of at least two base stations with the same synchronization level as a first upper-level synchronization base station and a second higher-level synchronization base station, and an error between them is within a preset threshold range.
可选的，在该实施方式中，所述第一上级同步基站和第二上级同步基站可以基于S401的方式进行确定，也可以基于以下方式进行确定：Optionally, in this implementation manner, the determination of the first upper-level synchronous base station and the second upper-level synchronous base station may be based on the manner of S401, or may be determined based on the following manner:
进一步地，若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个同步等级最高的那组基站为第一上级同步基站和第二上级同步基站；Further, if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, at least two groups of base stations with the highest synchronization level are determined to be the first upper-level synchronization base station and the second upper-level synchronization base station synchronous base station;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；Or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two groups of base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station ;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。Or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two base stations with the same upper-level synchronization base station are the first upper-level synchronization base station and the second upper-level synchronization base station Synchronize base stations.
更进一步地，所述确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站，可以包括：若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；Furthermore, the determining that at least two groups of base stations with the highest signal strengths are the first upper-level synchronization base station and the second upper-level synchronization base station may include: if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual When the error is within the preset threshold range and there are multiple groups of base stations with the highest synchronization level, at least two groups of base stations with the highest signal strength are determined as the first upper-level synchronization base station and the second higher-level synchronization base station;
所述确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站，可以包括：若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站；或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且在多组同步等级最高的基站中有多组信号强度最大的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。The determination of at least two base stations having the same upper-level synchronization base station as the first upper-level synchronization base station and the second upper-level synchronization base station may include: if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual error is within Within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, determine at least two groups of base stations with the same upper-level synchronization base station as the first higher-level synchronization base station and the second higher-level synchronization base station; or if multiple groups are determined There are base stations with the same synchronization level and the mutual errors are within the preset threshold range, and when there are multiple groups of base stations with the highest signal strength among the base stations with the highest synchronization level, determine at least two of the base stations with the same upper level synchronization base station The group base stations are the first upper-level synchronization base station and the second upper-level synchronization base station.
可以理解的是，本发明实施例中，至少两个用于定时同步的上级同步基站，其选择确定可以参考上述实施例中用于备选的上级同步基站的实施过程，即在满足确定出至少两个具有相同同步等级的基站且相互之间的误差在预置阈值范围内的条件下，优先选择同步等级高的那组基站，其次优先选择信号强度大的那组基站。在该实施方式中，若有多组基站在在同步等级相同且信号强度相当的基站，优先选择拥有相同上级同步基站的基站。It can be understood that, in the embodiment of the present invention, the selection and determination of at least two upper-level synchronization base stations for timing synchronization can refer to the implementation process for the alternative upper-level synchronization base stations in the above-mentioned embodiments, that is, when at least Under the condition that two base stations with the same synchronization level and the mutual error are within the preset threshold range, the group of base stations with higher synchronization level is preferentially selected, followed by the group of base stations with higher signal strength. In this embodiment, if there are multiple groups of base stations with the same synchronization level and comparable signal strength, the base stations with the same upper-level synchronization base station are preferentially selected.
S402、当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；S402. When the first upper-level synchronization base station cannot be used for timing synchronization, use the second upper-level synchronization base station to perform timing synchronization;
可选地，若目标基站确定一个用于定时同步的第一上级同步基站，和确定一个也用于定时同步的第二上级同步基站，即目标基站确定两个上级同步基站，则这两个上级同步基站(即第一上级同步基站和第二上级同步基站)可以基于以下方式进行使用：Optionally, if the target base station determines a first upper-level synchronization base station for timing synchronization and a second upper-level synchronization base station also for timing synchronization, that is, the target base station determines two upper-level synchronization base stations, then the two upper-level synchronization base stations The synchronous base stations (ie, the first upper-level synchronous base station and the second upper-level synchronous base station) can be used based on the following methods:
目标基站同时对两个上级同步基站进行定时同步，接收两个上级同步基站的同步信号，此时，所述方法还可以包括：获取所述第二上级同步基站发送同步信号的位置；在自身相应位置上设置为多媒体广播单频网(MBSFN，Multimedia Broadcast SingleFrequency Network)子帧，该目的是实现目标基站的同步；该实施方式下，所述方法还可以包括：获取所述第二上级同步基站接收其上级同步基站发送的同步信号的位置；在自身相应位置上设置为MBSFN子帧，该目的是避免对第二上级同步基站的干扰；也就是说目标基站的MBSFN子帧是两个上级同步基站接收子帧的并集；在MBSFN子帧上，目标基站不会发送数据，UE在之前的配置信息中也可以获知该子帧为MBSFN子帧而不会去接收数据。The target base station performs timing synchronization on two upper-level synchronization base stations at the same time, and receives the synchronization signals of the two upper-level synchronization base stations. At this time, the method may also include: obtaining the position where the second upper-level synchronization base station sends the synchronization signal; The position is set as a Multimedia Broadcast Single Frequency Network (MBSFN, Multimedia Broadcast Single Frequency Network) subframe, and the purpose is to realize the synchronization of the target base station; under this implementation mode, the method may also include: acquiring the second superior synchronization base station to receive The position of the synchronization signal sent by its superior synchronization base station; set it as an MBSFN subframe at its corresponding position, the purpose is to avoid interference with the second superior synchronization base station; that is to say, the MBSFN subframe of the target base station is two superior synchronization base stations Receive the union of subframes; on the MBSFN subframe, the target base station will not send data, and the UE can also know that the subframe is an MBSFN subframe in the previous configuration information and will not receive data.
可以理解的是，该实施方式中，两个上级同步基站(即第一上级同步基站和第二上级同步基站)的使用可以适用于多个上级同步基站的场景，本实施例仅以一个上级同步基站和一个第二上级同步基站作为当前上级同步基站为例进行说明，并不构成对本发明的限定。It can be understood that, in this embodiment, the use of two upper-level synchronization base stations (ie, the first upper-level synchronization base station and the second higher-level synchronization base station) can be applied to the scenario of multiple upper-level synchronization base stations. In this embodiment, only one upper-level synchronization base station is used. The base station and a second upper-level synchronous base station are described as examples of the current upper-level synchronous base station, which does not constitute a limitation of the present invention.
需要说明的是，在本发明该实施方式中所述目标基站始终维护着至少两个上级同步基站，即第一上级同步基站和至少一个第二上级同步基站。当至少两个上级同步基站中的一个上级同步基站无法用于定时同步时，该基站不再作为上级同步基站。当目标基站的上级同步基站少于两个时，按照上级同步基站的选择规则增加一个基站，新增加的基站应满足与已有的上级同步基站同步等级相同且同步误差在所述预置阈值范围内。It should be noted that, in this embodiment of the present invention, the target base station always maintains at least two upper-level synchronization base stations, that is, a first upper-level synchronization base station and at least one second upper-level synchronization base station. When one of the at least two upper-level synchronization base stations cannot be used for timing synchronization, this base station no longer serves as the upper-level synchronization base station. When the upper-level synchronization base station of the target base station is less than two, add a base station according to the selection rules of the upper-level synchronization base station, and the newly added base station should meet the same synchronization level as the existing upper-level synchronization base station and the synchronization error is within the preset threshold range Inside.
可选的，目标基站利用所述第二上级同步基站进行定时同步(S402)，之前还可以包括：当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。Optionally, the target base station uses the second upper-level synchronization base station to perform timing synchronization (S402). Before that, it may also include: when the link with the first upper-level synchronization base station fails, judging that the first upper-level synchronization base station cannot It is used for timing synchronization; or, when the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
可以理解的是，目标基站与所述第一上级同步基站链路失败，例如检测到连续N次检测到失步，可以确定目标基站与所述第一上级同步基站没有同步上，所述N为预设值；其中，目标基站与所述第一上级同步基站链路失败链路失败可以是由于第一上级同步基站随机关闭，或者目标基站与第一上级同步基站之间的信道质量差等原因所导致；所述第一上级同步基站与其上级同步基站链路失败，可以是由于第一上级同步基站的上级同步基站随机关闭，或者第一上级同步基站与第一上级同步基站的上级同步基站之间的信道质量差等原因所导致，本发明对此不作具体限定。It can be understood that, if the link between the target base station and the first upper-level synchronization base station fails, for example, when out-of-synchronization is detected for N consecutive times, it can be determined that the target base station is not synchronized with the first upper-level synchronization base station, and the N is Preset value; wherein, the link failure between the target base station and the first upper-level synchronization base station may be due to the random shutdown of the first-level synchronization base station, or poor channel quality between the target base station and the first upper-level synchronization base station. Caused; the failure of the link between the first upper-level synchronization base station and its upper-level synchronization base station may be due to the random shutdown of the upper-level synchronization base station of the first upper-level synchronization base station, or the connection between the first upper-level synchronization base station and the first-level synchronization base station. It is caused by reasons such as poor channel quality, which is not specifically limited in the present invention.
另外，本发明实施方式中，所述定时同步可以包括初始定时同步和同步跟踪，其中，初始定时同步是指目标基站或目标终端入网时初次获得定时，此时需要通过扫描主/辅同步信号得到；同步跟踪是指在已经获得定时的基础上维持同步，通过检测公共参考信号来实现定时的微调以维持同步。In addition, in the embodiments of the present invention, the timing synchronization may include initial timing synchronization and synchronization tracking, wherein the initial timing synchronization refers to the timing obtained for the first time when the target base station or target terminal is connected to the network, and at this time it needs to scan the primary/secondary synchronization signal to obtain ; Synchronous tracking refers to maintaining synchronization on the basis of already obtained timing, and realizing timing fine-tuning by detecting common reference signals to maintain synchronization.
由上述可知，本发明实施例提供的一种定时同步方法，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，也用于定时同步，以避免第一上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用第二上级同步基站继续保持同步，减少基站和基站、UE和UE之间的干扰。It can be seen from the above that the timing synchronization method provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station, which is also used for timing synchronization, so as to avoid the first-level When the synchronization base station cannot be used for timing synchronization, the small base station needs to search for the synchronization source again, so that the second upper-level synchronization base station can be used to continue to maintain synchronization, reducing the interference between base stations and base stations, and between UEs.
为便于更好的实施本发明实施例的技术方案，本发明实施例还提供用于实施上述定时同步方法的相关装置。其中名词的含义与上述定时同步的方法中相同，具体实现细节可以参考方法实施例中的说明。In order to better implement the technical solutions of the embodiments of the present invention, the embodiments of the present invention further provide a related device for implementing the foregoing timing synchronization method. The meanings of the nouns are the same as those in the above timing synchronization method, and for specific implementation details, please refer to the description in the method embodiments.
请参考图5，图5为本发明实施例提供的一种小基站500的结构示意图，其中，所述小基站500可应用于LTE TDD系统和LTE FDD系统，所述小基站500可以是微基站pico eNB、家庭小基站femto eNB、家庭基站HeNB等，所述小基站500包括：Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a small base station 500 provided by an embodiment of the present invention, wherein the small base station 500 is applicable to an LTE TDD system and an LTE FDD system, and the small base station 500 may be a micro base station pico eNB, home small base station femto eNB, home base station HeNB, etc., the small base station 500 includes:
确定模块501，用于确定用于定时同步的第一上级同步基站；A determination module 501, configured to determine a first upper-level synchronization base station for timing synchronization;
所述确定模块501，还用于确定至少一个第二上级同步基站；The determining module 501 is further configured to determine at least one second upper-level synchronization base station;
处理模块502，用于若所述第二上级同步基站用于定时同步的备选，则当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；The processing module 502 is configured to use the second upper-level synchronization base station to perform timing synchronization when the first upper-level synchronization base station cannot be used for timing synchronization if the second upper-level synchronization base station is used for timing synchronization;
在该实施方式下，所述第一上级同步基站为需要同步的小基站(即目标基站)当前用于定时同步的基站，所述第二上级同步基站为当第一上级同步基站无法用于定时同步时用于定时同步的备选基站；In this embodiment, the first upper-level synchronization base station is the base station currently used for timing synchronization by the small base station that needs to be synchronized (ie, the target base station), and the second upper-level synchronization base station is the base station that is used when the first upper-level synchronization base station cannot be used for timing synchronization. Alternative base stations for timing synchronization during synchronization;
所述处理模块502，还用于若所述第二上级同步基站也用于定时同步，则利用所述第一上级同步基站和/或所述第二上级同步基站进行定时同步。The processing module 502 is further configured to use the first upper-level synchronization base station and/or the second upper-level synchronization base station to perform timing synchronization if the second upper-level synchronization base station is also used for timing synchronization.
在该实施方式下，所述第一上级同步基站和第二上级同步基站同为目标基站当前用于定时同步的基站，所述第一上级同步基站和第二上级同步基站可以同时为目标基站提供定时同步，也可以分时为目标基站提供定时同步，另容易想到的是，当所述第一上级同步基站和第二上级同步基站中的一个基站无法用于定时同步时，目标基站可以利用其他的可用于定时同步的基站进行定时同步。In this embodiment, the first upper-level synchronization base station and the second upper-level synchronization base station are both base stations currently used by the target base station for timing synchronization, and the first upper-level synchronization base station and the second upper-level synchronization base station can simultaneously provide the target base station with Timing synchronization can also provide timing synchronization for the target base station in time-sharing. It is also easy to imagine that when one of the first upper-level synchronization base station and the second upper-level synchronization base station cannot be used for timing synchronization, the target base station can use other The base stations that can be used for timing synchronization perform timing synchronization.
由上述可知，本发明实施例提供的一种小基站500，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，也用于定时同步或用于定时同步的备选，以避免当前上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用备选的或其他用于定时同步的基站继续保持同步，减少基站和基站、UE和UE之间的干扰。It can be seen from the above that the small base station 500 provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station, which is also used for timing synchronization or is used for timing synchronization. Optional, to avoid the problem that the small base station needs to search for the synchronization source again when the current upper-level synchronization base station cannot be used for timing synchronization, so that the alternative or other base stations used for timing synchronization can be used to continue to maintain synchronization, reducing the number of base stations and base stations, Interference between UE and UE.
为方便理解和描述，以下实施例分别针对第二上级同步基站用于定时同步的备选和第二上级同步基站用于定时同步这两种情况对本发明实施例提供的小基站进行具体分析：For the convenience of understanding and description, the following embodiments specifically analyze the small base station provided by the embodiment of the present invention for the two cases where the second upper-level synchronization base station is used for timing synchronization and the second upper-level synchronization base station is used for timing synchronization:
若假设在本发明该实施方式中，所述第二上级同步基站用于定时同步的备选，即目标基站在搜索同步源的时候，需要确定一个当前用于定时同步的第一上级同步基站和确定至少一个用于定时同步的备选的第二上级同步基站；If it is assumed that in this embodiment of the present invention, the second upper-level synchronization base station is used as a candidate for timing synchronization, that is, when the target base station searches for a synchronization source, it needs to determine a current first-level synchronization base station and determining at least one alternative second superior synchronization base station for timing synchronization;
可选的，所述确定模块501具体基于如下方式确定所述第二上级同步基站：确定与所述第一上级同步基站具有相同同步等级的基站为第二上级同步基站；或确定同步等级最高的基站为第二上级同步基站；或确定信号强度最大的基站为第二上级同步基站。Optionally, the determining module 501 specifically determines the second upper-level synchronization base station based on the following manner: determining a base station having the same synchronization level as the first upper-level synchronization base station as the second upper-level synchronization base station; or determining the base station with the highest synchronization level The base station is the second upper level synchronous base station; or the base station determined to have the highest signal strength is the second upper level synchronous base station.
进一步地，所述确定模块501，用于确定同步等级最高的基站为第二上级同步基站具体为若确定出没有与所述第一上级同步基站具有相同同步等级的基站时，确定同步等级最高的基站为第二上级同步基站；Further, the determination module 501 is configured to determine that the base station with the highest synchronization level is the second upper-level synchronization base station. Specifically, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station, determine the highest synchronization level base station. The base station is a second upper-level synchronous base station;
所述确定模块501，用于确定信号强度最大的基站为第二上级同步基站具体为若确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或者，若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站时，确定信号强度最大的基站为第二上级同步基站。The determining module 501 is configured to determine that the base station with the highest signal strength is the second upper-level synchronization base station. Specifically, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station or there are multiple base stations with the first upper-level synchronization base station When the synchronization base station has base stations with the same synchronization level, determine that the base station with the highest signal strength is the second upper-level synchronization base station; or, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station and there are multiple synchronization levels. When there are base stations, it is determined that the base station with the highest signal strength is the second superior synchronization base station.
可以理解的是，所述确定模块501优先选择与所述第一上级同步基站具有相同同步等级的基站，这样当第一上级同步基站无法用于定时同步时，目标基站可以直接使用备选的第二上级同步基站进行定时同步，且进行定时同步时不需要调整目标基站本身的同步等级，也不需要调整以目标基站为上级同步基站的那些基站的同步等级；It can be understood that the determining module 501 preferentially selects a base station with the same synchronization level as the first upper-level synchronization base station, so that when the first upper-level synchronization base station cannot be used for timing synchronization, the target base station can directly use an alternative first-level synchronization base station. 2. The upper-level synchronous base station performs timing synchronization, and the timing synchronization does not need to adjust the synchronization level of the target base station itself, nor does it need to adjust the synchronization levels of those base stations with the target base station as the upper-level synchronization base station;
在某些实施方式中，目标基站可以直接根据同步等级的高低确定第二上级同步基站；也可以更进一步地，在确定出没有与所述第一上级同步基站具有相同同步等级的基站的情况下，优选选择同步等级最高的基站为第二上级同步基站；另可以理解的是，同步等级最高的基站可以理解为跳数最少或节点转发次数最少的基站，这样的基站能够保证同步精度误差累积最小；In some implementations, the target base station can directly determine the second upper-level synchronization base station according to the level of the synchronization level; or further, if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station , it is preferable to select the base station with the highest synchronization level as the second superior synchronization base station; it can also be understood that the base station with the highest synchronization level can be understood as the base station with the least number of hops or the least number of node forwarding times, and such a base station can guarantee the minimum accumulation of synchronization accuracy errors ;
在某些实施方式中，目标基站可以直接根据信号强度的强弱确定第二上级同步基站；也可以更进一步地，在确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站的情况下，确定信号强度最大的基站为第二上级同步基站。In some implementation manners, the target base station may directly determine the second upper-level synchronization base station according to the strength of the signal strength; When there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station; or if it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station And when there are multiple base stations with the highest synchronization level, it is determined that the base station with the highest signal strength is the second upper level synchronization base station.
在某些实施方式中，若所述第二上级同步基站用于定时同步的备选，目标基站在搜索同步源的时候，需要确定一个当前用于定时同步的第一上级同步基站，还需要维护一个备选上级同步基站列表；可参考图6，图6为该实施方式中小基站600的结构示意图，所述小基站除包括确定模块501和处理模块502，还包括：设置模块503，用于设置并维护备选上级同步基站列表；所述确定模块501，用于确定至少一个第二上级同步基站具体为基于所述第二上级同步基站的确定方式，确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站。其中，所述备选上级同步基站列表中的备选上级同步基站同步等级都相同，且都与所述第一上级同步基站的同步等级相同，或所述备选上级同步基站列表中的备选上级同步基站同步等级不同；In some embodiments, if the second upper-level synchronization base station is used as a candidate for timing synchronization, when the target base station searches for a synchronization source, it needs to determine a first-level synchronization base station currently used for timing synchronization, and also needs to maintain A list of candidate upper-level synchronous base stations; refer to FIG. 6, which is a schematic structural diagram of a small base station 600 in this embodiment. The small base station includes a determination module 501 and a processing module 502, and also includes a setting module 503 for setting And maintain a list of candidate upper-level synchronous base stations; the determining module 501 is configured to determine at least one second upper-level synchronous base station, specifically based on the determination method of the second upper-level synchronous base station, determine the The at least one candidate upper-level synchronization base station is a second upper-level synchronization base station. Wherein, the synchronization levels of the candidate upper-level synchronization base stations in the candidate upper-level synchronization base station list are all the same, and are the same as the synchronization level of the first upper-level synchronization base station, or the candidates in the candidate upper-level synchronization base station list The synchronization level of the upper-level synchronization base station is different;
可选的，若所述第二上级同步基站用于定时同步的备选，该实施方式中所述确定模块501还可以用于：Optionally, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the determination module 501 in this embodiment can also be used to:
若所述第二上级同步基站无法用于定时同步或所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，基于所述第二上级同步基站的确定方式确定新的备选上级同步基站。If the second upper-level synchronization base station cannot be used for timing synchronization or the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station for timing synchronization, determine a new candidate based on the determination method of the second upper-level synchronization base station Superior synchronization base station.
可选地，若所述第二上级同步基站用于定时同步的备选，所述小基站600还可以包括：调整模块，用于若所述第一上级同步基站与所述第二上级同步基站具有不相同的同步等级，且所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，调整自身同步等级比所述第二上级同步基站的同步等级低一级；控制模块，用于控制以所述小基站为上级同步基站的基站对应调整同步等级。Optionally, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the small base station 600 may further include: an adjustment module, configured to, if the first upper-level synchronization base station and the second upper-level synchronization base station have different synchronization levels, and when the second upper-level synchronization base station is upgraded to the upper-level synchronization base station currently used for timing synchronization, adjust its own synchronization level to be one level lower than the synchronization level of the second upper-level synchronization base station; the control module, The base station for controlling the small base station as a superior synchronization base station adjusts the synchronization level correspondingly.
进一步可选的，所述小基站600还可以包括：判断模块，用于当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。Further optionally, the small base station 600 may further include: a judging module, configured to determine that the first upper-level synchronization base station cannot be used for timing synchronization when the link with the first upper-level synchronization base station fails; or, When the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
可以理解的是，目标基站与所述第一上级同步基站链路失败，例如检测到连续N次检测到失步，可以确定目标基站与所述第一上级同步基站没有同步上，所述N为预设值；其中，目标基站与所述第一上级同步基站链路失败链路失败可以是由于第一上级同步基站随机关闭，或者目标基站与第一上级同步基站之间的信道质量差等原因所导致；所述第一上级同步基站与其上级同步基站链路失败，可以是由于第一上级同步基站的上级同步基站随机关闭，或者第一上级同步基站与第一上级同步基站的上级同步基站之间的信道质量差等原因所导致，本发明对此不作具体限定。另外，本发明实施方式中，所述定时同步可以包括初始定时同步和同步跟踪。It can be understood that, if the link between the target base station and the first upper-level synchronization base station fails, for example, when out-of-synchronization is detected for N consecutive times, it can be determined that the target base station is not synchronized with the first upper-level synchronization base station, and the N is Preset value; wherein, the link failure between the target base station and the first upper-level synchronization base station may be due to the random shutdown of the first-level synchronization base station, or poor channel quality between the target base station and the first upper-level synchronization base station. Caused; the failure of the link between the first upper-level synchronization base station and its upper-level synchronization base station may be due to the random shutdown of the upper-level synchronization base station of the first upper-level synchronization base station, or the connection between the first upper-level synchronization base station and the first-level synchronization base station. It is caused by reasons such as poor channel quality, which is not specifically limited in the present invention. In addition, in the implementation manner of the present invention, the timing synchronization may include initial timing synchronization and synchronization tracking.
由上述可知，本发明实施例提供的一种小基站600，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，用于定时同步的备选，或者，确定了所述备选上级同步基站列表中至少一个备选上级同步基站作为第二上级同步基站，用于定时同步的备选，以避免当前上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用第二上级同步基站继续保持同步，减少基站和基站、UE和UE之间的干扰。It can be seen from the above that the small base station 600 provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station for timing synchronization alternatives, or determines At least one candidate upper-level synchronization base station in the list of candidate upper-level synchronization base stations is selected as a second upper-level synchronization base station for timing synchronization, so as to prevent the small base station from needing to perform timing synchronization again when the current upper-level synchronization base station cannot be used for timing synchronization. The problem of searching for a synchronization source, so that the second superior synchronization base station can be used to continue to maintain synchronization, and the interference between base stations and base stations, and between UEs can be reduced.
若假设在本发明该实施方式中，所述第二上级同步基站也用于定时同步，即目标基站在搜索同步源的时候，需要确定至少两个当前用于定时同步上级同步基站，分别是一个第一上级同步基站和至少一个第二上级同步基站；If it is assumed that in this embodiment of the present invention, the second upper-level synchronization base station is also used for timing synchronization, that is, when the target base station searches for a synchronization source, it needs to determine at least two upper-level synchronization base stations currently used for timing synchronization. A first upper-level synchronization base station and at least one second upper-level synchronization base station;
在该实施方式下，所述确定模块501可以基于如下方式确定所述第一上级同步基站和第二上级同步基站：确定至少两个具有相同同步等级的一组基站为所述第一上级同步基站和第二上级同步基站，且相互之间的误差在预置阈值范围内。In this implementation manner, the determining module 501 may determine the first upper-level synchronization base station and the second higher-level synchronization base station based on the following method: determining at least two base stations with the same synchronization level as the first upper-level synchronization base station The base station is synchronized with the second upper level, and the mutual error is within a preset threshold range.
可选的，所述确定模块501还基于如下方式确定所述第一上级同步基站和第二上级同步基站：若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个同步等级最高的那组基站为第一上级同步基站和第二上级同步基站；或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。Optionally, the determining module 501 also determines the first upper-level synchronization base station and the second upper-level synchronization base station based on the following method: if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual error is within a preset threshold When within the range, at least two groups of base stations with the highest synchronization level are determined to be the first upper-level synchronization base station and the second upper-level synchronization base station; or if multiple groups of base stations with the same synchronization level are determined and the mutual errors are within the preset When within the threshold range, determine that at least two base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station; or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual error is within the predetermined When set within the threshold range, determine the group of base stations with at least two identical upper-level synchronization base stations as the first upper-level synchronization base station and the second upper-level synchronization base station.
更进一步的，所述确定模块501，用于确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站具体为若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；所述确定模块501，用于确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站具体为若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站；或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且在多组同步等级最高的基站中有多组信号强度最大的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。Furthermore, the determining module 501 is configured to determine that at least two groups of base stations with the highest signal strengths are the first upper-level synchronization base station and the second upper-level synchronization base station. Specifically, if multiple groups of base stations with the same synchronization level are determined and When the mutual error is within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, it is determined that at least two groups of base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station; the determination Module 501, used to determine that at least two base stations with the same upper-level synchronization base station are the first upper-level synchronization base station and the second upper-level synchronization base station. Specifically, if multiple groups of base stations with the same synchronization level are determined and the error between them is Within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, determine that at least two base stations with the same upper-level synchronization base station are the first higher-level synchronization base station and the second higher-level synchronization base station; or if it is determined that there are more than one A group of base stations with the same synchronization level and the mutual error is within the preset threshold range, and when multiple groups of base stations with the highest synchronization level have multiple groups of base stations with the highest signal strength, determine at least two base stations with the same upper level synchronization base station That group of base stations is a first superordinate synchronization base station and a second superordinate synchronization base station.
可选地，若所述第二上级同步基站用于定时同步，所述小基站600还可以包括：Optionally, if the second upper-level synchronization base station is used for timing synchronization, the small base station 600 may further include:
获取模块，用于获取所述第二上级同步基站发送同步信号的位置；An acquisition module, configured to acquire the location where the second superior synchronization base station sends the synchronization signal;
所述设置模块503，用于在所述小基站相应位置上设置为多媒体广播单频网MBSFN子帧。The setting module 503 is configured to set a multimedia broadcast single frequency network (MBSFN) subframe at a corresponding position of the small base station.
可选地，若所述第二上级同步基站用于定时同步，所述小基站600还可以包括：Optionally, if the second upper-level synchronization base station is used for timing synchronization, the small base station 600 may further include:
获取模块，用于获取所述第二上级同步基站接收其上级同步基站发送的同步信号的位置；An acquisition module, configured to acquire the position where the second upper-level synchronization base station receives the synchronization signal sent by its upper-level synchronization base station;
所述设置模块503，用于在所述小基站相应位置上设置为MBSFN子帧。The setting module 503 is configured to set an MBSFN subframe at a corresponding position of the small base station.
需要说明的是，在本发明该实施方式中所述目标基站始终维护着至少两个上级同步基站，即第一上级同步基站和至少一个第二上级同步基站。当至少两个上级同步基站中的一个上级同步基站无法用于定时同步时，该基站不再作为上级同步基站。当目标基站的上级同步基站少于两个时，按照上级同步基站的选择规则增加一个基站，新增加的基站应满足与已有的上级同步基站同步等级相同且同步误差在所述预置阈值范围内。It should be noted that, in this embodiment of the present invention, the target base station always maintains at least two upper-level synchronization base stations, that is, a first upper-level synchronization base station and at least one second upper-level synchronization base station. When one of the at least two upper-level synchronization base stations cannot be used for timing synchronization, this base station no longer serves as the upper-level synchronization base station. When the upper-level synchronization base station of the target base station is less than two, add a base station according to the selection rules of the upper-level synchronization base station, and the newly added base station should meet the same synchronization level as the existing upper-level synchronization base station and the synchronization error is within the preset threshold range Inside.
进一步可选的，所述小基站600还可以包括：判断模块，用于当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。Further optionally, the small base station 600 may further include: a judging module, configured to determine that the first upper-level synchronization base station cannot be used for timing synchronization when the link with the first upper-level synchronization base station fails; or, When the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization.
可以理解的是，目标基站与所述第一上级同步基站链路失败，例如检测到连续N次检测到失步，可以确定目标基站与所述第一上级同步基站没有同步上，所述N为预设值；其中，目标基站与所述第一上级同步基站链路失败链路失败可以是由于第一上级同步基站随机关闭，或者目标基站与第一上级同步基站之间的信道质量差等原因所导致；所述第一上级同步基站与其上级同步基站链路失败，可以是由于第一上级同步基站的上级同步基站随机关闭，或者第一上级同步基站与第一上级同步基站的上级同步基站之间的信道质量差等原因所导致，本发明对此不作具体限定。另外，本发明实施方式中，所述定时同步可以包括初始定时同步和同步跟踪。It can be understood that, if the link between the target base station and the first upper-level synchronization base station fails, for example, when out-of-synchronization is detected for N consecutive times, it can be determined that the target base station is not synchronized with the first upper-level synchronization base station, and the N is Preset value; wherein, the link failure between the target base station and the first upper-level synchronization base station may be due to the random shutdown of the first-level synchronization base station, or poor channel quality between the target base station and the first upper-level synchronization base station. Caused; the failure of the link between the first upper-level synchronization base station and its upper-level synchronization base station may be due to the random shutdown of the upper-level synchronization base station of the first upper-level synchronization base station, or the connection between the first upper-level synchronization base station and the first-level synchronization base station. It is caused by reasons such as poor channel quality, which is not specifically limited in the present invention. In addition, in the implementation manner of the present invention, the timing synchronization may include initial timing synchronization and synchronization tracking.
由上述可知，本发明实施例提供的一种小基站600，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，也用于定时同步，以避免第一上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用第二上级同步基站继续保持同步，减少基站和基站、UE和UE之间的干扰。It can be seen from the above that the small base station 600 provided by the embodiment of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station, which is also used for timing synchronization, so as to avoid the first-level synchronization When the synchronization base station cannot be used for timing synchronization, the small base station needs to search for the synchronization source again, so that the second upper-level synchronization base station can be used to continue to maintain synchronization, reducing the interference between base stations and base stations, and between UEs.
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的小基站及小基站中的单元模块的具体工作过程，可以参考前述定时同步的方法实施例中的对应过程，在此不再赘述。Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the small base station and the unit modules in the small base station described above can refer to the corresponding process in the foregoing timing synchronization method embodiment. This will not be repeated here.
请参考图7，图7为本发明实施例提供的另一种小基站700的结构示意图，所述小基站700可应用于LTE TDD系统和LTE FDD系统，所述小基站500可以是微基站pico eNB、家庭小基站femto eNB、家庭基站HeNB等，所述小基站700包括输入装置701、输出装置702、处理器703，其中，所述处理器703执行如下步骤：Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of another small base station 700 provided by an embodiment of the present invention. The small base station 700 can be applied to an LTE TDD system and an LTE FDD system. The small base station 500 can be a pico base station eNB, home small base station femto eNB, home base station HeNB, etc., the small base station 700 includes an input device 701, an output device 702, and a processor 703, wherein the processor 703 performs the following steps:
确定用于定时同步的第一上级同步基站；确定至少一个第二上级同步基站；若所述第二上级同步基站用于定时同步的备选，则当所述第一上级同步基站无法用于定时同步时，利用所述第二上级同步基站进行定时同步；若所述第二上级同步基站也用于定时同步，则利用所述第一上级同步基站和/或所述第二上级同步基站进行定时同步。Determine a first upper-level synchronization base station for timing synchronization; determine at least one second upper-level synchronization base station; if the second upper-level synchronization base station is used for timing synchronization, when the first upper-level synchronization base station cannot be used for timing During synchronization, use the second upper-level synchronization base station for timing synchronization; if the second upper-level synchronization base station is also used for timing synchronization, use the first upper-level synchronization base station and/or the second upper-level synchronization base station for timing Synchronize.
在一种实施方式中，优选地，若所述第二上级同步基站用于定时同步的备选，所述处理器703还可以执行如下步骤：In an implementation manner, preferably, if the second upper-level synchronization base station is used as an option for timing synchronization, the processor 703 may also perform the following steps:
所述第二上级同步基站基于如下方式确定：确定与所述第一上级同步基站具有相同同步等级的基站为第二上级同步基站；或确定同步等级最高的基站为第二上级同步基站；或确定信号强度最大的基站为第二上级同步基站。The second upper-level synchronous base station is determined based on the following method: determine that the base station with the same synchronization level as the first upper-level synchronous base station is the second upper-level synchronous base station; or determine that the base station with the highest synchronization level is the second upper-level synchronous base station; or determine The base station with the highest signal strength is the second superior synchronization base station.
优选地，所述处理器703确定同步等级最高的基站为第二上级同步基站，具体包括：Preferably, the processor 703 determines that the base station with the highest synchronization level is the second upper-level synchronization base station, specifically including:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站时，确定同步等级最高的基站为第二上级同步基站；If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest synchronization level is the second upper-level synchronization base station;
其中，所述确定信号强度最大的基站为第二上级同步基站，包括：Wherein, the base station with the largest determined signal strength is the second superior synchronization base station, including:
若确定出没有与所述第一上级同步基站具有相同同步等级的基站或有多个与所述第一上级同步基站具有相同同步等级的基站时，确定信号强度最大的基站为第二上级同步基站；或If it is determined that there is no base station with the same synchronization level as the first upper-level synchronization base station or there are multiple base stations with the same synchronization level as the first upper-level synchronization base station, determine that the base station with the highest signal strength is the second upper-level synchronization base station ;or
若确定出没有与所述第一上级同步基站具有相同同步等级的基站且有多个同步等级最高的基站时，确定信号强度最大的基站为第二上级同步基站。If it is determined that there is no base station with the same synchronization level as the first upper level synchronization base station and there are multiple base stations with the highest synchronization level, determine that the base station with the highest signal strength is the second upper level synchronization base station.
优选地，若所述第二上级同步基站用于定时同步的备选，所述处理器703还可以执行如下步骤：Preferably, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the processor 703 may also perform the following steps:
若所述第二上级同步基站无法用于定时同步或所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，基于所述第二上级同步基站的确定方式确定新的备选上级同步基站。If the second upper-level synchronization base station cannot be used for timing synchronization or the second upper-level synchronization base station is upgraded to the current upper-level synchronization base station for timing synchronization, determine a new candidate based on the determination method of the second upper-level synchronization base station Superior synchronization base station.
优选地，若所述第二上级同步基站用于定时同步的备选，所述处理器703还可以执行如下步骤：Preferably, if the second upper-level synchronization base station is used as a candidate for timing synchronization, the processor 703 may also perform the following steps:
若所述第一上级同步基站与所述第二上级同步基站具有不相同的同步等级，且所述第二上级同步基站升级为当前用于定时同步的上级同步基站时，调整自身同步等级比所述第二上级同步基站的同步等级低一级，并控制以其为上级同步基站的基站对应调整同步等级。If the first upper-level synchronous base station and the second upper-level synchronous base station have different synchronization levels, and the second upper-level synchronous base station is upgraded to the current upper-level synchronization base station used for timing synchronization, adjust the self-synchronization level ratio. The synchronization level of the second upper-level synchronization base station is one level lower, and controls the base station using it as the upper-level synchronization base station to adjust the synchronization level accordingly.
优选地，若所述第二上级同步基站用于定时同步的备选，所述确定至少一个第二上级同步基站之前，所述处理器703还可以执行如下步骤：Preferably, if the second upper-level synchronization base station is used as a candidate for timing synchronization, before determining at least one second upper-level synchronization base station, the processor 703 may also perform the following steps:
设置并维护备选上级同步基站列表，所述备选上级同步基站列表中的备选上级同步基站的同步等级都相同，且都与所述第一上级同步基站的同步等级相同，或所述备选上级同步基站列表中的备选上级同步基站同步等级不同；Setting and maintaining a list of candidate upper-level synchronization base stations, where the synchronization levels of the candidate upper-level synchronization base stations in the list of candidate upper-level synchronization base stations are all the same, and are the same as the synchronization levels of the first upper-level synchronization base station, or the candidate The synchronization levels of the candidate upper-level synchronization base stations in the selected upper-level synchronization base station list are different;
所述确定至少一个第二上级同步基站为：The determining at least one second upper-level synchronization base station is:
基于所述第二上级同步基站的确定方式，确定所述备选上级同步基站列表中的至少一个备选上级同步基站为第二上级同步基站。Based on the determining manner of the second upper-level synchronization base station, at least one candidate upper-level synchronization base station in the candidate upper-level synchronization base station list is determined as the second upper-level synchronization base station.
在另一种实施方式中，优选地，若所述第二上级同步基站用于定时同步，所述处理器703还可以执行如下步骤：In another implementation manner, preferably, if the second upper-level synchronization base station is used for timing synchronization, the processor 703 may also perform the following steps:
所述第一上级同步基站和第二上级同步基站基于如下方式确定：确定至少两个具有相同同步等级的一组基站为第一上级同步基站和第二上级同步基站，且相互之间的误差在预置阈值范围内。The first upper-level synchronous base station and the second upper-level synchronous base station are determined based on the following method: at least two base stations with the same synchronization level are determined as the first upper-level synchronous base station and the second upper-level synchronous base station, and the mutual error is between Within the preset threshold range.
优选地，若所述第二上级同步基站用于定时同步，所述处理器703还可以执行如下步骤：Preferably, if the second upper-level synchronization base station is used for timing synchronization, the processor 703 may also perform the following steps:
第一上级同步基站和第二上级同步基站还基于如下方式确定：若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个同步等级最高的那组基站为第一上级同步基站和第二上级同步基站；The first upper-level synchronous base station and the second upper-level synchronous base station are also determined based on the following method: if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two with the highest synchronization level The group of base stations is the first upper-level synchronization base station and the second upper-level synchronization base station;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；Or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two groups of base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station ;
或若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。Or if it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, determine that at least two base stations with the same upper-level synchronization base station are the first upper-level synchronization base station and the second upper-level synchronization base station Synchronize base stations.
优选地，若所述第二上级同步基站用于定时同步，所述处理器703确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站，具体包括：Preferably, if the second upper-level synchronization base station is used for timing synchronization, the processor 703 determines that at least two groups of base stations with the highest signal strength are the first upper-level synchronization base station and the second upper-level synchronization base station, specifically including:
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个信号强度最大的那组基站为第一上级同步基站和第二上级同步基站；If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, determine that at least two base stations with the highest signal strength are the first an upper level synchronization base station and a second upper level synchronization base station;
所述确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站，包括：The determination of at least two base stations having the same upper-level synchronization base station as the first upper-level synchronization base station and the second upper-level synchronization base station includes:
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且有多组同步等级最高的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站；或If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, and there are multiple groups of base stations with the highest synchronization level, determine that at least two base stations with the same upper level synchronization base station are A first upper-level synchronization base station and a second upper-level synchronization base station; or
若确定出有多组具有相同同步等级的基站且相互之间的误差在预置阈值范围内，且在多组同步等级最高的基站中有多组信号强度最大的基站时，确定至少两个具有相同上级同步基站的那组基站为第一上级同步基站和第二上级同步基站。If it is determined that there are multiple groups of base stations with the same synchronization level and the mutual errors are within the preset threshold range, and there are multiple groups of base stations with the highest signal strength among the multiple groups of base stations with the highest synchronization level, determine at least two groups with The group of base stations of the same upper level synchronization base station is the first upper level synchronization base station and the second upper level synchronization base station.
优选地，若所述第二上级同步基站用于定时同步，所述处理器703还可以执行如下步骤：Preferably, if the second upper-level synchronization base station is used for timing synchronization, the processor 703 may also perform the following steps:
获取所述第二上级同步基站发送同步信号的位置；在自身相应位置上设置为多媒体广播单频网MBSFN子帧。Acquiring the position where the second upper-level synchronous base station sends the synchronization signal; setting the corresponding position as the MBSFN subframe.
优选地，若所述第二上级同步基站用于定时同步，所述处理器703还可以执行如下步骤：Preferably, if the second upper-level synchronization base station is used for timing synchronization, the processor 703 may also perform the following steps:
获取所述第二上级同步基站接收其上级同步基站发送的同步信号的位置；在自身相应位置上设置为MBSFN子帧。Obtain the position where the second upper-level synchronization base station receives the synchronization signal sent by the upper-level synchronization base station; set the corresponding position as an MBSFN subframe.
优选地，所述处理器703利用所述第二上级同步基站进行定时同步，之前还可以执行如下步骤：Preferably, the processor 703 uses the second superior synchronization base station to perform timing synchronization, and the following steps may also be performed before:
当与所述第一上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步；或者，当所述第一上级同步基站与其上级同步基站链路失败时，判断出所述第一上级同步基站无法用于定时同步。When the link with the first upper-level synchronization base station fails, it is determined that the first upper-level synchronization base station cannot be used for timing synchronization; or when the link between the first upper-level synchronization base station and its upper-level synchronization base station fails, it is determined that The first upper-level synchronization base station cannot be used for timing synchronization.
在本发明实施例中，所述定时同步包括初始定时同步和同步跟踪，其中，初始定时同步是指目标基站或目标终端入网时初次获得定时，此时需要通过扫描主/辅同步信号得到；同步跟踪是指在已经获得定时的基础上维持同步，通过检测公共参考信号来实现定时的微调以维持同步。In the embodiment of the present invention, the timing synchronization includes initial timing synchronization and synchronization tracking, wherein the initial timing synchronization refers to the timing obtained for the first time when the target base station or the target terminal is connected to the network, which needs to be obtained by scanning the primary/secondary synchronization signal; Tracking refers to maintaining synchronization on the basis of already obtained timing, and realizing timing fine-tuning by detecting common reference signals to maintain synchronization.
由上述可知，本发明实施例提供的一种小基站，在某些实施方式中，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，用于定时同步的备选；在某些实施方式中，不仅确定当前用于定时同步的第一上级同步基站，还确定了所述备选上级同步基站列表中至少一个备选上级同步基站作为第二上级同步基站，用于定时同步的备选；在某些实施方式中，不仅确定当前用于定时同步的第一上级同步基站，还确定了第二上级同步基站，也用于定时同步，以避免第一上级同步基站无法用于定时同步时，小基站需要重新进行同步源搜索的问题，从而能够使用第二上级同步基站继续保持同步，减少基站和基站、UE和UE之间的干扰。It can be seen from the above that, in some implementations, the small base station provided by the embodiments of the present invention not only determines the first upper-level synchronization base station currently used for timing synchronization, but also determines the second upper-level synchronization base station, which is used for timing synchronization. Optional; in some embodiments, not only the first upper-level synchronization base station currently used for timing synchronization is determined, but also at least one candidate upper-level synchronization base station in the list of candidate upper-level synchronization base stations is determined as the second upper-level synchronization base station, Alternative for timing synchronization; in some embodiments, not only the first superior synchronization base station currently used for timing synchronization is determined, but also a second superior synchronization base station is determined, also used for timing synchronization, to avoid the first superior synchronization When the base station cannot be used for timing synchronization, the small base station needs to search for the synchronization source again, so that the second upper-level synchronization base station can be used to continue to maintain synchronization, reducing the interference between the base station and the base station, and between the UE and the UE.
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的小基站的具体工作过程，可以参考前述定时同步的方法实施例中的对应过程，在此不再赘述。Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the small base station described above can refer to the corresponding process in the foregoing timing synchronization method embodiment, and details are not repeated here.
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。In the several embodiments provided in this application, it should be understood that the disclosed devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
另外，在本发明各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-OnlyMemory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, and other media that can store program codes.
以上对本发明所提供的一种定时同步方法以及小基站进行了详细介绍，对于本领域的一般技术人员，依据本发明实施例的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。The timing synchronization method and the small base station provided by the present invention have been introduced in detail above. For those skilled in the art, according to the idea of the embodiment of the present invention, there will be changes in the specific implementation and application scope. In summary, the contents of this specification should not be construed as limiting the present invention.
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| CN201310093045.3ACN104066166B (en) | 2013-03-21 | 2013-03-21 | A kind of time synchronization method and small base station |
| PCT/CN2014/073843WO2014146601A1 (en) | 2013-03-21 | 2014-03-21 | Timing synchronization method and small base station |
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| CN201310093045.3ACN104066166B (en) | 2013-03-21 | 2013-03-21 | A kind of time synchronization method and small base station |
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| CN105657814B (en)* | 2012-05-29 | 2019-01-08 | 电信科学技术研究院 | The method and apparatus of base station synchronization |
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