技术领域technical field
本发明涉及3G长期演进(LongTermEvolution，LTE)技术，特别涉及消除LTE系统中由时延引起的特殊子帧内干扰的方法。The invention relates to 3G long-term evolution (LongTermEvolution, LTE) technology, in particular to a method for eliminating interference in a special subframe caused by time delay in an LTE system.
背景技术Background technique
为了应对宽带接入技术的挑战，并满足日益增长的新型业务的需求，第三代合作伙伴项目(3rdGenerationPartnershipProject，3GPP)在2004年底启动了3GLTE技术的标准化工作，希望进一步提高频谱效率，改善小区边缘用户的性能，降低系统延迟，为高速移动用户提供更高速率的接入服务等。In order to meet the challenges of broadband access technology and to meet the growing demands of new services, the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) started the standardization of 3GLTE technology at the end of 2004, hoping to further improve spectrum efficiency and improve cell edge Improve user performance, reduce system delay, and provide higher-speed access services for high-speed mobile users.
图1显示了LTE系统定义的特殊子帧的结构。如图1所示，特殊子帧包括下行导频时隙(DwPTS)、保护间隔(GP)以及上行导频时隙(UpPTS)三个部分。在LTE系统中，在采用常规循环前缀(CyclicPrefix，CP)时共支持9种特殊子帧的长度配置，而在采用扩展CP时共支持7种特殊子帧的长度配置。表1显示了LTE系统采用常规CP和扩展CP时特殊子帧的长度配置。从表1可以看出，在LTE系统中，GP的长度以及位置都是可变的，这主要用以适应各种尺寸的小区半径。其中，GP的长度主要取决于小区的半径，一般来说，半径大的小区对应的GP长度大于半径小的小区对应的GP长度。Figure 1 shows the structure of a special subframe defined by the LTE system. As shown in FIG. 1 , the special subframe includes three parts: a downlink pilot time slot (DwPTS), a guard interval (GP) and an uplink pilot time slot (UpPTS). In the LTE system, a total of 9 special subframe length configurations are supported when a regular cyclic prefix (CyclicPrefix, CP) is used, and a total of 7 special subframe length configurations are supported when an extended CP is used. Table 1 shows the length configuration of the special subframe when the LTE system adopts the normal CP and the extended CP. It can be seen from Table 1 that in the LTE system, the length and position of the GP are variable, which is mainly used to adapt to cell radii of various sizes. The length of the GP mainly depends on the radius of the cell. Generally speaking, the length of the GP corresponding to the cell with a large radius is greater than the length of the GP corresponding to the cell with a small radius.
表1Table 1
异构网络是一种显著提升系统吞吐量和网络整体效率的技术。异构网络是指至少一个低功率节点(LowPowerNode，LPN)被布放在一个高功率节点(HighPowerNode，HPN)的覆盖区域内，形成同覆盖的不同节点类型的异构系统。其中，HPN是指发射功率较高，覆盖半径较大的基站，例如，宏蜂窝基站等；LPN是指发射功率较低，覆盖半较小的基站，例如，小蜂窝基站、微蜂窝基站、豪微蜂窝基站以及远端射频头(RemoteRadioHead，RRH)或中继(Relay)等。Heterogeneous network is a technology that significantly improves system throughput and overall network efficiency. A heterogeneous network refers to a heterogeneous system in which at least one low-power node (LowPowerNode, LPN) is deployed in the coverage area of a high-power node (HighPowerNode, HPN), forming different node types with the same coverage. Among them, HPN refers to base stations with high transmission power and large coverage radius, such as macrocell base stations, etc.; LPN refers to base stations with low transmission power and small coverage, such as small cell base stations, microcell base stations, luxury cell base stations, etc. Femtocell base station and remote radio head (RemoteRadioHead, RRH) or relay (Relay), etc.
如前所述，在异构网络场景下，时分双工(TDD)改进的长期演进(LTE-A)系统中将存在半径不同的各种小区，也就是说，在异构网络场景下各个小区特殊子帧的配置都有可能不同。例如，在一个HPN的覆盖范围内会有很多LPN，并且这些LPN的特殊子帧配置与HPN的特殊子帧配置很有可能不同。由于LPN的覆盖半径比HPN的覆盖半径小得多，所以通常来说LPN的GP长度会短一些。这样一来，由于传输时延的存在，LPN的DwPTS与HPN的UpPTS就有可能在时间上产生交叠，此时，LPN特殊子帧中的下行DwPTS就可能对HPN的上行接收造成干扰，导致系统性能的下降。As mentioned above, in a heterogeneous network scenario, there will be various cells with different radii in the Time Division Duplex (TDD) Long Term Evolution-Advanced (LTE-A) system, that is to say, in the heterogeneous network scenario, each cell Configurations of special subframes may be different. For example, there are many LPNs within the coverage of an HPN, and the special subframe configuration of these LPNs is likely to be different from the special subframe configuration of the HPN. Since the coverage radius of LPN is much smaller than that of HPN, generally speaking, the GP length of LPN will be shorter. In this way, due to the existence of transmission delay, the DwPTS of the LPN and the UpPTS of the HPN may overlap in time. At this time, the downlink DwPTS in the LPN special subframe may cause interference to the uplink reception of the HPN, resulting in System performance degradation.
图2(a)-(d)显示了四种在采用常规CP时LPN特殊子帧中的DwPTS对HPN的上行接收造成干扰的可能的组合。其中，图2(a)-(d)中LPN均采用了的编号为4的特殊子帧的长度配置，也即在该长度配置下DwPTS、GP、UpPTS的长度分别是12、1和1个符号；而HPN则分别采用了的编号为5、6、7和8的特殊子帧的长度配置，也即此时DwPTS、GP、UpPTS的长度分别是3、9、2，9、3、2，10、2、2和11、1、2个符号。在图2(a)-(d)中任一种所示的情况下，理论上当时延超过一个CP的长度且HPN和LPN之间的距离大于或等于1406米时，LPN特殊子帧中的DwPTS就可能对HPN的上行接收造成干扰。而在实际的网络中，由于反射、折射等实际情况的存在，HPN和LPN之间的距离不到1406米时也有可能会产生上述这种干扰，因此，在实际的网络中这种干扰是经常会发生的。下面进一步计算一下干扰发生时的信噪比。假设HPN和LPN之间的距离为1406米，HPN用户与HPN的距离为1000米；采用的路损模型为L＝128.1+37.6log10(R)。此时，LPN和HPN用户的发送功率分别为30dBm和23dBm。LPN发射天线增益和HPN接收天线增益均为5dBi。那么，HPN接收到的干扰功率Pr1和数据功率Pr2分别如公式(1)和(2)所示，接收信噪比如公式(3)所示。由公式(1)至(3)可以看出，这种由于时延引起的特殊子帧内的干扰对系统的影响是很大的，可能会导致HPN无法正常进行上行接收。Figure 2(a)-(d) shows four possible combinations of DwPTS in LPN special subframes causing interference to HPN uplink reception when a conventional CP is used. Among them, the LPNs in Figure 2(a)-(d) all adopt the length configuration of the special subframe numbered 4, that is, the lengths of DwPTS, GP, and UpPTS under this length configuration are 12, 1, and 1 respectively symbols; while HPN adopts the length configuration of special subframes numbered 5, 6, 7, and 8, that is, the lengths of DwPTS, GP, and UpPTS are 3, 9, 2, 9, 3, and 2 respectively. , 10, 2, 2 and 11, 1, 2 symbols. In any case shown in Figure 2(a)-(d), theoretically when the delay exceeds the length of one CP and the distance between the HPN and the LPN is greater than or equal to 1406 meters, the LPN special subframe The DwPTS may cause interference to the uplink reception of the HPN. In the actual network, due to the existence of actual conditions such as reflection and refraction, the above-mentioned interference may also occur when the distance between the HPN and the LPN is less than 1406 meters. Therefore, in the actual network, this interference is often will happen. Let's further calculate the signal-to-noise ratio when interference occurs. Assume that the distance between the HPN and the LPN is 1406 meters, and the distance between the HPN user and the HPN is 1000 meters; the adopted path loss model is L=128.1+37.6log10(R). At this time, the transmit powers of the LPN and HPN users are 30dBm and 23dBm respectively. Both the LPN transmit antenna gain and the HPN receive antenna gain are 5dBi. Then, the interference power Pr1 and the data power Pr2 received by the HPN are shown in formulas (1) and (2) respectively, and the received signal-to-noise ratio is shown in formula (3). From the formulas (1) to (3), it can be seen that the interference in the special subframe caused by the time delay has a great impact on the system, which may cause the HPN to fail to perform normal uplink reception.
Pr1＝pt1-L1+5+5＝30-(128.1+37.6log10(1.406))+10＝-93.66dBm(1)Pr1＝pt1-L1+5+5＝30-(128.1+37.6log10(1.406))+10＝-93.66dBm(1)
Pr2＝pt2-L2+5＝23-(128.1+37.6log10(1))+5＝-100.1dBm(2)Pr2＝pt2-L2+5＝23-(128.1+37.6log10(1))+5＝-100.1dBm(2)
SINR＝Pr2-Pr1＝-6.44dB(3)SINR＝Pr2-Pr1＝-6.44dB(3)
图3(a)-(c)显示了三种在采用扩展CP时LPN特殊子帧中的DwPTS对HPN的上行接收造成干扰的可能的组合。其中，图3(a)-(c)中LPN均采用了的编号为3的特殊子帧的长度配置，也即在改长度配置下DwPTS、GP、UpPTS的长度分别是10、1和1；而HPN分别采用了的编号为4、5和6的特殊子帧的长度配置，也即此时DwPTS、GP、UpPTS的长度分别是3、7、2，8、2、2以及9、1、2。在图3(a)-(c)中任一种所示的情况下，理论上当时延超过一个扩展CP的长度且HPN和LPN之间的距离大于或等于5001米，干扰就会发生。而在实际的网络中，由于反射，折射等实际情况的存在，距离不到5001米时也有可能会发生这种干扰，因此，在实际的网络中这种干扰是经常会发生的。同样地，可以进一步计算一下干扰发生时的信噪比。假设HPN和LPN之间的距离为5000米，HPN用户与HPN之间的距离为4000米；采用路损模型为L＝128.1+37.6log10(R)。此时，LPN和HPN用户的发送功率分别为30dBm和23dBm。LPN的发射天线增益和HPN的接收天线增益均为5dBi。那么，HPN接收到的干扰功率Pr1和数据功率Pr2分别如公式(4)和(5)所示，接收信噪比如公式(6)所示。由公式(4)至(6)可以看出，这种由于时延引起的特殊子帧内的干扰对系统的影响是很大的，可能会导致HPN无法正常进行上行接收。Figure 3(a)-(c) shows three possible combinations of DwPTS in LPN special subframes causing interference to uplink reception of HPN when extended CP is used. Among them, the LPNs in Figure 3(a)-(c) all adopt the length configuration of the special subframe numbered 3, that is, the lengths of DwPTS, GP, and UpPTS are 10, 1, and 1 respectively under the length configuration; The HPN adopts the length configuration of special subframes numbered 4, 5, and 6 respectively, that is, the lengths of DwPTS, GP, and UpPTS are 3, 7, 2, 8, 2, 2, and 9, 1, respectively. 2. In any case shown in Figure 3(a)-(c), theoretically, when the delay exceeds the length of one extended CP and the distance between HPN and LPN is greater than or equal to 5001 meters, interference will occur. In the actual network, due to the existence of actual conditions such as reflection and refraction, such interference may also occur when the distance is less than 5001 meters. Therefore, this interference often occurs in the actual network. Similarly, the signal-to-noise ratio when interference occurs can be further calculated. Assume that the distance between the HPN and the LPN is 5000 meters, and the distance between the HPN user and the HPN is 4000 meters; the path loss model is L=128.1+37.6log10(R). At this time, the transmit powers of the LPN and HPN users are 30dBm and 23dBm respectively. The transmitting antenna gain of the LPN and the receiving antenna gain of the HPN are both 5dBi. Then, the interference power Pr1 and the data power Pr2 received by the HPN are shown in formulas (4) and (5) respectively, and the received signal-to-noise ratio is shown in formula (6). From the formulas (4) to (6), it can be seen that the interference in the special subframe caused by the time delay has a great impact on the system, which may cause the HPN to fail to perform normal uplink reception.
Pr1＝pt1-L1+5+5＝30-(128.1+37.6log5)+5+5＝-114.38dBm(4)Pr1＝pt1-L1+5+5＝30-(128.1+37.6log5)+5+5＝-114.38dBm(4)
Pr2＝pt2-L2+5＝23-(128.1+37.6log4)+5＝-122.74dBm(5)Pr2＝pt2-L2+5＝23-(128.1+37.6log4)+5＝-122.74dBm(5)
SINR＝Pr2-Pr1＝-8.36dB(6)SINR＝Pr2-Pr1＝-8.36dB(6)
此外，在时分同步码分多址(TD-SCDMA)系统中，也存在着类似的由时延引起的特殊子帧内的干扰。因此，如何避免此类干扰已成为LTE系统需要解决的问题之一。In addition, in the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, there is similar interference in special subframes caused by time delay. Therefore, how to avoid such interference has become one of the problems to be solved in the LTE system.
发明内容Contents of the invention
为了解决上述问题，本发明提供了多种消除特殊子帧内干扰的方法，可以消除由时延引起的LPN特殊子帧中的下行DwPTS对HPN的上行接收造成的干扰，提高系统性能。In order to solve the above problems, the present invention provides a variety of methods for eliminating interference in the special subframe, which can eliminate the interference caused by the delay caused by the downlink DwPTS in the LPN special subframe to the uplink reception of the HPN, and improve system performance.
本发明公开了一种消除特殊子帧内干扰的方法，包括：分别确定HPN和LPN可以采用的特殊子帧的长度配置，使LPN特殊子帧中的下行导频时隙不会对HPN的上行接收造成干扰；HPN和LPN分别从确定的可以采用的特殊子帧的长度配置中选择自身采用的特殊子帧的长度配置；The invention discloses a method for eliminating interference in a special subframe, which includes: respectively determining the length configuration of the special subframes that can be used by HPN and LPN, so that the downlink pilot time slot in the LPN special subframe will not affect the uplink of HPN The reception causes interference; the HPN and the LPN respectively select the length configuration of the special subframe adopted by themselves from the determined length configuration of the special subframe that can be adopted;
其中，确定LPN可以采用的特殊子帧的长度配置包括：确定LPN可以采用的特殊子帧的长度配置中不包括保护间隔以及上行导频时隙的长度均为1个符号的长度配置。Wherein, determining the length configuration of the special subframe that the LPN can adopt includes: determining that the length configuration of the special subframe that the LPN can adopt does not include a guard interval and a length configuration in which the length of the uplink pilot time slot is 1 symbol.
本发明还公开了一种消除特殊子帧内干扰的方法，包括：HPN监测LPN特殊子帧中的下行导频时隙是否对自身的上行接收造成干扰，如果HPN的上行接收受到了周围LPN特殊子帧中下行导频时隙的干扰，则HPN将自身特殊子帧中上行导频时隙的长度减小一个符号长度。The invention also discloses a method for eliminating interference in a special subframe, including: HPN monitors whether the downlink pilot time slot in the LPN special subframe interferes with its own uplink reception, if the HPN's uplink reception is affected by the surrounding LPN special If the downlink pilot time slot in the subframe interferes, the HPN reduces the length of the uplink pilot time slot in its own special subframe by one symbol length.
其中，HPN监测LPN特殊子帧中的下行导频时隙是否对自身的上行接收造成干扰包括：HPN对接收到的上行同步码进行解调，若解调性能在一段预先设定的时间内低于一个预先设定的门限值，则判定HPN的上行接收受到了周围LPN特殊子帧中下行导频时隙的干扰。Among them, the HPN monitors whether the downlink pilot time slot in the LPN special subframe interferes with its own uplink reception, including: HPN demodulates the received uplink synchronization code, if the demodulation performance is low within a preset If it is lower than a preset threshold value, it is determined that the uplink reception of the HPN is interfered by the downlink pilot slots in the surrounding LPN special subframes.
上述方法可以进一步包括：HPN重新配置自身特殊子帧中保护间隔和下行导频时隙的长度，使特殊子帧的总长度保持不变。The above method may further include: the HPN reconfigures the length of the guard interval and the downlink pilot time slot in its own special subframe, so that the total length of the special subframe remains unchanged.
上述方法还可以进一步包括：若HPN的上行接收受到了周围LPN特殊子帧中下行导频时隙的干扰，则HPN通知LPN自身的上行接收正受到该LPN特殊子帧中下行导频时隙的干扰；LPN将自身特殊子帧中下行导频时隙的长度减小一个符号长度。The above method may further include: if the uplink reception of the HPN is interfered by the downlink pilot time slot in the surrounding LPN special subframe, the HPN notifies the LPN that its own uplink reception is being interfered by the downlink pilot time slot in the LPN special subframe Interference: LPN reduces the length of the downlink pilot slot in its own special subframe by one symbol length.
在本步骤中，HPN可以通过HPN和LPN之间的接口或通过核心网通知LPN。In this step, the HPN may notify the LPN through the interface between the HPN and the LPN or through the core network.
在这种情况下，上述方法还可以进一步包括：LPN重新配置自身特殊子帧中上行导频时隙和保护间隔的长度，使特殊子帧的总长度保持不变。In this case, the above method may further include: the LPN reconfigures the length of the uplink pilot time slot and the guard interval in its own special subframe, so that the total length of the special subframe remains unchanged.
其中，第一种方法通过限制某些特殊子帧的配置，来实现消除特殊子帧内的干扰；而另外的方法可以在不占用数据时隙的基础上，实现自适应地消除由时延引起的特殊子帧内的干扰。通过本发明所述的方法可以在LTE异构网络场景下，使HPN的上行接收更加准确。Among them, the first method eliminates interference in special subframes by restricting the configuration of some special subframes; while the other method can adaptively eliminate interference caused by delay without occupying data slots. Interference within the special subframe. The uplink reception of HPN can be made more accurate under the scene of LTE heterogeneous network through the method of the present invention.
附图说明Description of drawings
图1显示了LTE系统中特殊子帧的结构；Figure 1 shows the structure of a special subframe in an LTE system;
图2(a)-(d)显示了在采用常规CP时HPN的上行接收受到LPNDwPTS的干扰的四种组合；Figure 2(a)-(d) shows four combinations in which the uplink reception of HPN is interfered by LPNDwPTS when a conventional CP is used;
图3(a)-(c)显示了在采用扩展CP时HPN的上行接收受到LPNDwPTS的干扰的三种组合；Figure 3(a)-(c) shows three combinations in which the uplink reception of HPN is interfered by LPNDwPTS when the extended CP is used;
图4为本发明实施例1所述的消除特殊子帧内干扰的方法流程图；FIG. 4 is a flowchart of a method for eliminating interference in a special subframe according to Embodiment 1 of the present invention;
图5为本发明实施例2所述的消除特殊子帧内干扰的方法流程图；FIG. 5 is a flowchart of a method for eliminating interference in a special subframe according to Embodiment 2 of the present invention;
图6(a)和(b)为采用本发明实施例2所述方法之后常规CP和扩展CP下的传输示意图；Figure 6 (a) and (b) are schematic diagrams of transmission under the conventional CP and the extended CP after adopting the method described in Embodiment 2 of the present invention;
图7为本发明实施例3所述的消除特殊子帧内干扰的方法流程图；FIG. 7 is a flowchart of a method for eliminating interference in a special subframe according to Embodiment 3 of the present invention;
图8(a)和(b)为采用本发明实施例3所述方法之后常规CP和扩展CP下的传输示意图。Fig. 8 (a) and (b) are schematic diagrams of transmission under the normal CP and the extended CP after adopting the method described in Embodiment 3 of the present invention.
具体实施方式detailed description
下面结合本发明的实施例详细说明本发明消除特殊子帧内干扰的方法。The method for eliminating interference in a special subframe of the present invention will be described in detail below in conjunction with the embodiments of the present invention.
实施例1：Example 1:
从图2(a)至(d)以及图3(a)至(c)可以看出，在采用常规CP的情况下，产生干扰时，LPN均采用的是编号为4的特殊子帧的长度配置，也即此时DwPTS、GP、UpPTS的长度分别是12、1和1个符号；而采用扩展CP的情况下，产生干扰时，LPN均采用的是编号为3的特殊子帧的长度配置，也即DwPTS、GP、UpPTS的长度分别是10、1和1个符号。也即，在干扰发生时，LPN的特殊子帧中的GP和UpPTS的长度均为1个符号。如此，本实施例所采用的消除特殊子帧内干扰的方法就是禁止LPN采用上述两种特殊子帧的长度配置，也即所确定的LPN可以采用的特殊子帧的长度配置中不包括GP以及UpPTS的长度均为1个符号的长度配置，具体方法如图4所示，主要包括：From Figure 2(a) to (d) and Figure 3(a) to (c), it can be seen that in the case of using a conventional CP, when interference occurs, the LPN uses the length of the special subframe numbered 4 Configuration, that is, the lengths of DwPTS, GP, and UpPTS are 12, 1, and 1 symbols respectively; in the case of extended CP, when interference occurs, LPN adopts the length configuration of the special subframe numbered 3 , that is, the lengths of DwPTS, GP, and UpPTS are 10, 1, and 1 symbol, respectively. That is, when interference occurs, the lengths of the GP and the UpPTS in the special subframe of the LPN are both 1 symbol. In this way, the method for eliminating interference in the special subframe adopted in this embodiment is to prohibit the LPN from adopting the above two special subframe length configurations, that is, the determined length configuration of the special subframe that the LPN can adopt does not include GP and The length of UpPTS is configured with the length of 1 symbol. The specific method is shown in Figure 4, mainly including:
步骤101，分别确定HPN和LPN可以采用的特殊子帧的长度配置，使LPN特殊子帧中的下行DwPTS不会对HPN的上行接收造成干扰；Step 101, respectively determine the length configuration of the special subframes that can be used by the HPN and the LPN, so that the downlink DwPTS in the LPN special subframe will not interfere with the uplink reception of the HPN;
具体而言，在LTE系统中，HPN可以采用的特殊子帧的长度配置如表1所示，而LPN可以采用的特殊子帧的长度配置将如表2所示。Specifically, in the LTE system, the length configuration of the special subframe that can be used by the HPN is shown in Table 1, and the length configuration of the special subframe that can be used by the LPN will be shown in Table 2.
表2Table 2
对比表1和表2的特殊子帧的长度配置可以看出，为了消除LPN特殊子帧中下行DwPTS对HPN上行接收造成的干扰，LPN可以采用的特殊子帧的长度配置将不包含在采用常规CP时编号为4的特殊子帧的长度配置，即不采用DwPTS、GP、UpPTS的长度分别是12、1和1个符号的长度配置以及在采用扩展CP时编号为3的特殊子帧的长度配置，即不采用DwPTS、GP、UpPTS的长度分别是10、1和1个符号的长度配置。Comparing the length configuration of special subframes in Table 1 and Table 2, it can be seen that in order to eliminate the interference caused by downlink DwPTS in LPN special subframes to HPN uplink reception, the length configuration of special subframes that can be used by LPN will not be included in the normal The length configuration of the special subframe numbered 4 when the CP is used, that is, the length configuration of DwPTS, GP, and UpPTS are 12, 1, and 1 symbol respectively, and the length of the special subframe numbered 3 when the extended CP is used Configuration, that is, do not use the length configuration of DwPTS, GP, and UpPTS whose lengths are 10, 1, and 1 symbol, respectively.
步骤102，HPN和LPN分别从确定的可以采用的特殊子帧的长度配置中选择自身采用的特殊子帧的长度配置。In step 102, the HPN and the LPN respectively select the length configuration of the special subframe adopted by the HPN and the LPN from the determined length configurations of the special subframe that can be adopted.
通过上述描述可以看出，由于在本实施例中，所确定的LPN可以采用的特殊子帧的长度配置中不包含其下行DwPTS可能对HPN上行接收造成干扰的长度配置，因此，即使在时延发生时LPN特殊子帧中的下行DwPTS也不会对HPN的上行接收造成干扰。It can be seen from the above description that in this embodiment, the determined length configuration of the special subframe that can be used by the LPN does not include the length configuration that the downlink DwPTS may cause interference to the HPN uplink reception, so even if the delay When it occurs, the downlink DwPTS in the LPN special subframe will not cause interference to the uplink reception of the HPN.
实施例1所述的消除特殊子帧内干扰的方法是预先确定LPN可以采用的特殊子帧的长度配置，从根本上消除LPN特殊子帧中的DwPTS可能对HPN上行接收造成干扰的各种可能情况。除此之外，还可以采用如下所述的动态调整方案，即HPN首先监测其周围LPN特殊子帧中的DwPTS是否对自身的上行接收造成干扰，如果HPN的上行接收受到了周围LPN特殊子帧中DwPTS的干扰，则调整HPN或LPN特殊子帧的长度配置，以消除LPN特殊子帧中的DwPTS对HPN的上行接收造成的干扰。具体的实现方法请见下面的实施例2和3。The method for eliminating interference in the special subframe described in Embodiment 1 is to predetermine the length configuration of the special subframe that the LPN can adopt, and fundamentally eliminate all possibilities that the DwPTS in the LPN special subframe may interfere with the HPN uplink reception Condition. In addition, the following dynamic adjustment scheme can also be used, that is, the HPN first monitors whether the DwPTS in its surrounding LPN special subframes interferes with its own uplink reception. If the interference of the DwPTS in the LPN special subframe is used, the length configuration of the HPN or LPN special subframe is adjusted to eliminate the interference caused by the DwPTS in the LPN special subframe to the uplink reception of the HPN. For specific implementation methods, please refer to Embodiments 2 and 3 below.
实施例2：Example 2:
图5显示了本实施例所述的消除特殊子帧内干扰的方法流程，该方法主要包括：FIG. 5 shows the flow of the method for eliminating interference in a special subframe described in this embodiment. The method mainly includes:
步骤201：HPN对接收到的上行同步码(SYNC_UL)进行解调，若解调性能在一段预先设定的时间内低于一个预先设定的门限值，则判定HPN的上行接收受到了周围LPN特殊子帧中DwPTS的干扰。Step 201: The HPN demodulates the received uplink synchronization code (SYNC_UL). If the demodulation performance is lower than a preset threshold within a preset period of time, it is determined that the uplink reception of the HPN has been affected by the surrounding Interference of DwPTS in LPN special subframes.
本步骤所述的预先设定的时间以及预先设定的门限值可以根据测量得到的实际的无线通信环境计算设定。The preset time and the preset threshold described in this step can be calculated and set according to the measured actual wireless communication environment.
步骤202：HPN将自身特殊子帧中UpPTS的长度减小一个符号长度，例如，由2个符号长度减小为1个符号长度。Step 202: The HPN reduces the length of the UpPTS in its own special subframe by one symbol length, for example, reducing the length from 2 symbols to 1 symbol length.
具体而言，在本步骤中，在HPN将自身特殊子帧中UpPTS的长度减小一个符号长度时，相应地，HPN可以重新配置自身特殊子帧中GP和DwPTS的长度，使得特殊子帧的总长度保持不变，例如，HPN可以在表1重新选择满足UpPTS的长度为1个符号长度时的特殊子帧长度配置。Specifically, in this step, when the HPN reduces the length of the UpPTS in its own special subframe by one symbol length, the HPN can reconfigure the lengths of GP and DwPTS in its own special subframe accordingly, so that the length of the UpPTS in the special subframe The total length remains unchanged. For example, the HPN may reselect the special subframe length configuration in Table 1 when the length of the UpPTS is 1 symbol.
图6(a)和(b)为采用本实施例所述方法之后在采用常规CP和扩展CP下的传输示意图。由图6(a)和(b)可以看出，在采取了本实施例所述的方法之后，这种由时延引起的特殊子帧的干扰可以得到有效地避免。Fig. 6 (a) and (b) are schematic diagrams of transmission using the conventional CP and the extended CP after adopting the method described in this embodiment. It can be seen from Fig. 6(a) and (b) that after adopting the method described in this embodiment, the interference of the special subframe caused by time delay can be effectively avoided.
实施例3：Example 3:
图7显示了本实施例所述的消除特殊子帧内干扰的方法流程，该方法主要包括：FIG. 7 shows the flow of the method for eliminating interference in a special subframe described in this embodiment. The method mainly includes:
步骤301：HPN对接收到的上行同步码(SYNC_UL)进行解调，若解调性能在一段预先设定的时间内低于一个预先设定的门限值，则判定HPN的上行接收受到了周围LPN特殊子帧中DwPTS的干扰。Step 301: The HPN demodulates the received uplink synchronization code (SYNC_UL). If the demodulation performance is lower than a preset threshold within a preset period of time, it is determined that the uplink reception of the HPN has been affected by the surrounding Interference of DwPTS in LPN special subframes.
本步骤所述的预先设定的时间以及预先设定的门限值可以根据测量得到的实际的无线通信环境计算设定。The preset time and the preset threshold described in this step can be calculated and set according to the measured actual wireless communication environment.
步骤302：HPN通知LPN自身的上行接收正受到该LPN特殊子帧中DwPTS的干扰。Step 302: The HPN notifies the LPN that its own uplink reception is being interfered by the DwPTS in the LPN special subframe.
在本步骤中，HPN可以通过HPN和LPN之间的接口，例如X2接口，通知LPN或者HPN可以通过核心网通知LPN。In this step, the HPN may notify the LPN through an interface between the HPN and the LPN, such as the X2 interface, or the HPN may notify the LPN through the core network.
步骤303：LPN将将自身特殊子帧中DwPTS的长度减小一个符号长度，例如，在采用常规CP时，由12个符号长度减小为11个符号长度；或者采用扩展CP时，由10个符号长度减小为9个符号长度。Step 303: The LPN will reduce the length of the DwPTS in its own special subframe by one symbol length, for example, when using a regular CP, reduce the length from 12 symbols to 11 symbols; or when using an extended CP, reduce it by 10 The symbol length is reduced to 9 symbols long.
具体而言，在本步骤中，在LPN将自身特殊子帧中DwPTS的长度减小一个符号长度时，相应地，LPN可以重新配置自身特殊子帧中UpPTS和GP的长度，使得特殊子帧的总长度保持不变，例如，LPN可以在表1重新选择满足DwPTS的长度减小一1个符号长度时(例如，在采用常规CP时DwPTS为11个符号长度时，或在采用扩展CP时DwPTS为9个符号长度时)特殊子帧的长度配置。Specifically, in this step, when the LPN reduces the length of the DwPTS in its own special subframe by one symbol length, the LPN can reconfigure the lengths of UpPTS and GP in its own special subframe accordingly, so that the length of the DwPTS in the special subframe The total length remains the same, e.g. LPN can be reselected in Table 1 to meet the DwPTS length reduced by 1 symbol length (e.g. DwPTS is 11 symbols long when using regular CP, or DwPTS is 1 symbol long when using extended CP When the length is 9 symbols), the length configuration of the special subframe.
图8(a)和(b)为采用本实施例所述方法之后在采用常规CP和扩展CP下的传输示意图。由图8(a)和(b)可以看出，在采取了本实施例所述方法之后，这种由时延引起的特殊子帧的干扰可以得到有效地避免。Fig. 8 (a) and (b) are schematic diagrams of transmission under the use of the conventional CP and the extended CP after adopting the method described in this embodiment. It can be seen from Fig. 8(a) and (b) that after adopting the method described in this embodiment, the interference of the special subframe caused by time delay can be effectively avoided.
此外，还可以进一步简单计算一下采用了实施例2或3所述的方法之后再发生干扰的可能性。在采用了实施例2或3所述的方法之后，只有时延大于1个符号长度加上1个CP长度时干扰才会再次发生。在这种情况下，对于常规CP，要求发生干扰时HPN和LPN间的最短距离为22835米；而对于扩展CP，要求发生干扰时HPN和LPN间的最短距离为30000米。然而，在实际的应用中，一般的小区半径均不会达到这两个数值，从此可以看出，在采用了实施例2或3所述的方法之后，干扰再次发生的可能性非常小。这也证明了本发明实施例2或3所述的方法可以十分有效地消除这种由时延引起的特殊子帧内的干扰。In addition, the possibility of interference occurring after the method described in Embodiment 2 or 3 can be further simply calculated. After adopting the method described in Embodiment 2 or 3, the interference will reoccur only when the time delay is greater than 1 symbol length plus 1 CP length. In this case, for the conventional CP, the minimum distance between the HPN and the LPN is required to be 22,835 meters when interference occurs; while for the extended CP, the minimum distance between the HPN and the LPN is required to be 30,000 meters when interference occurs. However, in practical applications, the radius of a general cell does not reach these two values. It can be seen from this that after the method described in Embodiment 2 or 3 is adopted, the possibility of interference occurring again is very small. This also proves that the method described in Embodiment 2 or 3 of the present invention can effectively eliminate the interference in the special subframe caused by time delay.
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明保护的范围之内。The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.
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