技术领域Technical field
本公开涉及无线通信技术领域，尤其涉及一种随机接入方法、网络节点和用户设备。The present disclosure relates to the field of wireless communication technology, and in particular, to a random access method, network node and user equipment.
背景技术Background technique
随着信息产业的快速发展，特别是来自移动互联网和物联网(internet ofthings，IoT)的增长需求，给未来移动通信技术带来前所未有的挑战。为了应对这前所未有的挑战，通信产业界和学术界已经展开了广泛的第五代移动通信技术(5G)研究，以面向2020年代。With the rapid development of the information industry, especially the growing demand from the mobile Internet and the Internet of Things (IoT), unprecedented challenges have been brought to future mobile communication technology. In order to cope with this unprecedented challenge, the communications industry and academia have launched extensive research on fifth-generation mobile communications technology (5G) to face the 2020s.
随机接入的性能直接影响到用户的体验。在如长期演进(Long Term Evolution，LTE)以及演进的LTE(LTE-Advanced)通信系统中，随机接入过程根据用户是否独占前导序列资源划分为基于竞争的随机接入(Contention-based Random Access)以及基于非竞争的随机接入(Contention-free Random Access)。由于基于竞争的随机接入中，各个用户在尝试建立上行连接的过程中，从相同的前导序列资源中选择前导序列，可能会出现多个用户选择相同的前导序列发送给基站。因此，需要新的随机接入技术，提高随机接入性能。The performance of random access directly affects the user experience. In communication systems such as Long Term Evolution (LTE) and LTE-Advanced (LTE-Advanced), the random access process is divided into contention-based random access (Contention-based Random Access) based on whether the user exclusively occupies the preamble sequence resource. And non-contention-based random access (Contention-free Random Access). Since in contention-based random access, each user selects a preamble sequence from the same preamble sequence resource when trying to establish an uplink connection, multiple users may select the same preamble sequence to send to the base station. Therefore, new random access technology is needed to improve random access performance.
发明内容Contents of the invention
本公开提供了一种随机接入方法、网络节点和用户设备(UE)。The present disclosure provides a random access method, network node and user equipment (UE).
根据本公开的一方面，提供了一种随机接入方法，包括步骤：用户设备UE针对目标小区的信号进行测量；所述UE向与服务小区对应的网络节点发送关于所述目标小区的信号的测量报告；所述UE从所述网络节点接收包括用于随机接入的资源配置信息的切换命令；以及所述UE基于所述资源配置信息在所述目标小区进行随机接入。According to an aspect of the present disclosure, a random access method is provided, including the steps of: user equipment UE performs measurements on signals of a target cell; the UE sends information about the signal of the target cell to a network node corresponding to the serving cell. A measurement report; the UE receives a handover command including resource configuration information for random access from the network node; and the UE performs random access in the target cell based on the resource configuration information.
在一个示例性实施例中，所述资源配置信息包括以下项中的至少一项：基于普通上行链路的随机接入资源配置信息；以及基于补充上行链路的随机接入资源配置信息。In an exemplary embodiment, the resource configuration information includes at least one of the following: normal uplink-based random access resource configuration information; and supplementary uplink-based random access resource configuration information.
在一个示例性实施例中，所述资源配置信息还包括向所述UE指示是使用普通上行链路还是补充上行链路进行随机接入的指示。In an exemplary embodiment, the resource configuration information further includes an indication to the UE whether to use a normal uplink or a supplementary uplink for random access.
在一个示例性实施例中，所述资源配置信息还包括向所述UE发送的专属的随机接入资源配置信息。In an exemplary embodiment, the resource configuration information also includes exclusive random access resource configuration information sent to the UE.
在一个示例性实施例中，所述专属的随机接入资源配置信息包括用于使所述UE判断是使用普通上行链路还是补充上行链路进行随机接入的第一阈值。In an exemplary embodiment, the dedicated random access resource configuration information includes a first threshold for enabling the UE to determine whether to use a normal uplink or a supplementary uplink for random access.
在一个示例性实施例中，所述UE通过测量所述目标小区的同步信号块SSB或配置的信道状态信息参考信号CSI-RS来获得所述测量报告，并且所述资源配置信息还包括：所述SSB与对应的随机接入资源的映射关系或所述CSI-RS与对应的随机接入资源的映射关系；以及用于选择所述SSB或所述CSI-RS的第二阈值。In an exemplary embodiment, the UE obtains the measurement report by measuring the synchronization signal block SSB or the configured channel state information reference signal CSI-RS of the target cell, and the resource configuration information also includes: The mapping relationship between the SSB and the corresponding random access resources or the mapping relationship between the CSI-RS and the corresponding random access resources; and a second threshold for selecting the SSB or the CSI-RS.
在一个示例性实施例中，所述UE通过测量所述目标小区的同步信号块SSB或配置的信道状态信息参考信号CSI-RS来获得所述测量报告，并且所述专属的随机接入资源配置信息包括：所述SSB与对应的随机接入资源的映射关系或所述CSI-RS与对应的随机接入资源的映射关系；以及用于选择所述SSB或所述CSI-RS的第二阈值。In an exemplary embodiment, the UE obtains the measurement report by measuring the synchronization signal block SSB or the configured channel state information reference signal CSI-RS of the target cell, and the dedicated random access resource configuration The information includes: a mapping relationship between the SSB and the corresponding random access resource or a mapping relationship between the CSI-RS and the corresponding random access resource; and a second threshold for selecting the SSB or the CSI-RS. .
在一个示例性实施例中，所述方法还包括步骤：所述UE比较目标小区最新的信号测量结果与所述第一阈值根据比较结果来确定使用普通上行链路还是补充上行链路进行随机接入。In an exemplary embodiment, the method further includes the step of: the UE compares the latest signal measurement result of the target cell with the first threshold to determine whether to use a normal uplink or a supplementary uplink for random access based on the comparison result. enter.
根据本公开的另一方面，提供了一种随机接入方法，包括步骤：从用户设备UE接收关于目标小区的信号的测量报告；基于所述测量报告，向UE发送包括用于随机接入的资源配置信息的切换命令。According to another aspect of the present disclosure, a random access method is provided, including the steps of: receiving a measurement report on a signal of a target cell from a user equipment UE; based on the measurement report, sending to the UE information including a signal for random access. Switching command for resource configuration information.
在一个示例性实施例中，所述资源配置信息包括以下项中的至少一项：基于普通上行链路的随机接入资源配置信息；以及基于补充上行链路的随机接入资源配置信息。In an exemplary embodiment, the resource configuration information includes at least one of the following: normal uplink-based random access resource configuration information; and supplementary uplink-based random access resource configuration information.
在一个示例性实施例中，所述资源配置信息还包括向所述UE指示是使用普通上行链路还是补充上行链路进行随机接入的指示。In an exemplary embodiment, the resource configuration information further includes an indication to the UE whether to use a normal uplink or a supplementary uplink for random access.
在一个示例性实施例中，所述资源配置信息还包括向所述UE发送的专属的随机接入资源配置信息。In an exemplary embodiment, the resource configuration information also includes exclusive random access resource configuration information sent to the UE.
在一个示例性实施例中，所述专属的随机接入资源配置信息包括用于使所述UE判断是使用普通上行链路还是补充上行链路进行随机接入的第一阈值。In an exemplary embodiment, the dedicated random access resource configuration information includes a first threshold for enabling the UE to determine whether to use a normal uplink or a supplementary uplink for random access.
在一个示例性实施例中，所述测量报告是所述UE通过测量所述目标小区的同步信号块SSB或配置的信道状态信息参考信号CSI-RS来获得的，并且所述资源配置信息还包括：所述SSB与对应的随机接入资源的映射关系或所述CSI-RS与对应的随机接入资源的映射关系；以及用于选择所述SSB或所述CSI-RS的第二阈值。In an exemplary embodiment, the measurement report is obtained by the UE by measuring the synchronization signal block SSB or the configured channel state information reference signal CSI-RS of the target cell, and the resource configuration information also includes : the mapping relationship between the SSB and the corresponding random access resource or the mapping relationship between the CSI-RS and the corresponding random access resource; and a second threshold for selecting the SSB or the CSI-RS.
在一个示例性实施例中，所述测量报告是所述UE通过测量所述目标小区的同步信号块SSB或配置的信道状态信息参考信号CSI-RS来获得的，并且所述专属的随机接入资源配置信息包括：所述SSB与对应的随机接入资源的映射关系或所述CSI-RS与对应的随机接入资源的映射关系；以及用于选择所述SSB或所述CSI-RS的第二阈值。In an exemplary embodiment, the measurement report is obtained by the UE by measuring the synchronization signal block SSB or the configured channel state information reference signal CSI-RS of the target cell, and the dedicated random access The resource configuration information includes: a mapping relationship between the SSB and the corresponding random access resource or a mapping relationship between the CSI-RS and the corresponding random access resource; and a third method used to select the SSB or the CSI-RS. Two thresholds.
根据本公开的另一方面，提供了一种用户设备，包括：通信接口，配置用于通信；处理器；以及存储器，存储有计算机可执行指令，所述指令在被处理器执行时，使处理器执行以下操作：针对目标小区的信号进行测量；向与服务小区对应的网络节点发送关于所述目标小区的信号的测量报告；从所述网络节点接收包括用于随机接入的资源配置信息的切换命令；以及基于所述资源配置信息在所述目标小区进行随机接入。According to another aspect of the present disclosure, a user equipment is provided, including: a communication interface configured for communication; a processor; and a memory storing computer-executable instructions that, when executed by the processor, cause processing The device performs the following operations: performs measurements on the signal of the target cell; sends a measurement report on the signal of the target cell to the network node corresponding to the serving cell; receives from the network node including resource configuration information for random access. a handover command; and performing random access in the target cell based on the resource configuration information.
根据本公开的另一方面，提供了一种网络节点，包括：通信接口，配置用于通信；处理器；以及存储器，存储有计算机可执行指令，所述指令在被处理器执行时，使处理器执行以下操作：从用户设备UE接收关于对目标小区的信号的测量报告；基于所述测量报告，向UE发送包括用于随机接入的资源配置信息的切换命令。According to another aspect of the present disclosure, a network node is provided, including: a communication interface configured for communication; a processor; and a memory storing computer-executable instructions that, when executed by the processor, cause processing The processor performs the following operations: receiving a measurement report on the signal to the target cell from the user equipment UE; based on the measurement report, sending a handover command including resource configuration information for random access to the UE.
利用本公开的上述实施例的方案，能提高UE随机接入目标小区的性能。Using the solution of the above embodiments of the present disclosure, the performance of the UE's random access to the target cell can be improved.
附图说明Description of the drawings
为了更好地理解本发明，将根据以下附图对本发明进行详细描述：In order to better understand the present invention, the present invention will be described in detail based on the following drawings:
图1示出了基于竞争的随机接入的过程的示意流程图；Figure 1 shows a schematic flow chart of a contention-based random access process;
图2示出了根据本公开一个示例性实施例的随机接入方法的示意流程图；Figure 2 shows a schematic flow chart of a random access method according to an exemplary embodiment of the present disclosure;
图3示出了根据本公开示例性实施例的UE选择随机接入信道的示意图；Figure 3 shows a schematic diagram of a UE selecting a random access channel according to an exemplary embodiment of the present disclosure;
图4示出了根据本公开另一示例性实施例的在UE处进行随机接入的方法的示意流程图；Figure 4 shows a schematic flowchart of a method for random access at a UE according to another exemplary embodiment of the present disclosure;
图5示出了根据本公开示例性实施例的设备的结构示意图；以及Figure 5 shows a schematic structural diagram of a device according to an exemplary embodiment of the present disclosure; and
图6示出了应用了根据本公开示例性实施例的方法的设备间的信号流图。FIG. 6 shows a signal flow diagram between devices to which a method according to an exemplary embodiment of the present disclosure is applied.
具体实施方式Detailed ways
为了使本申请的目的、技术手段和优点更加清楚明白，以下结合附图对本申请做进一步详细说明。下面通过参考附图描述的实施例是示例性的，仅用于解释本公开，而不能解释为对本公开的限制。In order to make the purpose, technical means and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure and cannot be construed as limiting the present disclosure.
本技术领域技术人员可以理解，除非另外定义，这里使用的所有术语(包括技术术语和科学术语)，具有与本公开所属领域中的普通技术人员的一般理解相同的意义。还应该理解的是，诸如通用字典中定义的那些术语，应该被理解为具有与现有技术的上下文中的意义一致的意义，并且除非像这里一样被特定定义，否则不会用理想化或过于正式的含义来解释。It can be understood by one of ordinary skill in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It should also be understood that terms, such as those defined in general dictionaries, are to be understood to have meanings consistent with their meaning in the context of the prior art, and are not to be used in an idealistic or overly descriptive manner unless specifically defined as here. to explain the formal meaning.
图1示出了LTE-A中基于竞争的随机接入的过程100的示意流程图。如图1所示，在步骤S110中，用户设备(User Equipment，UE)从前导序列资源池中随机选择一个前导序列，发送给基站。基站对接收信号进行相关性检测，从而识别出UE所发送的前导序列。Figure 1 shows a schematic flow chart of a process 100 of contention-based random access in LTE-A. As shown in Figure 1, in step S110, the user equipment (User Equipment, UE) randomly selects a preamble sequence from the preamble sequence resource pool and sends it to the base station. The base station performs correlation detection on the received signal to identify the preamble sequence sent by the UE.
在步骤S120中，基站向UE发送随机接入响应(Random Access Response，RAR)，包含随机接入前导序列标识符、根据UE与基站间时延估计所确定的定时提前指令、临时小区无线网络临时标识(Cell-Radio Network Temporary Identifier，C-RNTI)、以及为UE下次上行传输所分配的时频资源。In step S120, the base station sends a random access response (Random Access Response, RAR) to the UE, including a random access preamble sequence identifier, a timing advance instruction determined based on the delay estimate between the UE and the base station, a temporary cell wireless network temporary Identifier (Cell-Radio Network Temporary Identifier, C-RNTI), and the time-frequency resources allocated for the UE's next uplink transmission.
在步骤S130中，UE根据RAR中的信息，向基站发送消息三(Msg3)。Msg3中包含UE终端标识(如S-TMSI，随机数等)以及无线资源控制(Radio Resource Control，RRC)连接请求等信息，其中，该UE终端标识是UE唯一的，用于解决冲突。In step S130, the UE sends message three (Msg3) to the base station based on the information in the RAR. Msg3 contains UE terminal identification (such as S-TMSI, random number, etc.) and radio resource control (Radio Resource Control, RRC) connection request and other information. The UE terminal identification is unique to the UE and is used to resolve conflicts.
在步骤S140中，基站向UE发送冲突解决标识，其包含了在冲突解决中胜出的UE的UE终端标识。UE在检测出自己的标识后，将临时C-RNTI升级为C-RNTI，并向基站发送确认(Acknowledgement，ACK)信号，完成随机接入过程，并等待基站的调度。否则，UE将在一段延时后开始新的随机接入过程。In step S140, the base station sends the conflict resolution identifier to the UE, which contains the UE terminal identifier of the UE that wins the conflict resolution. After detecting its own identity, the UE upgrades the temporary C-RNTI to C-RNTI, sends an acknowledgment (ACK) signal to the base station, completes the random access process, and waits for scheduling by the base station. Otherwise, the UE will start a new random access process after a delay.
对于基于非竞争的随机接入过程，由于基站已知用户标识(除了UE终端标识之外，还可以包括C-RNTI)，可以为UE分配前导序列。因此UE在发送前导序列时，不需要随机选择序列，而会使用分配好的前导序列。基站在检测到分配好的前导序列后，会发送相应的随机接入响应，包括定时提前以及上行资源分配等信息。UE接收到随机接入响应后，认为已完成上行同步，等待基站的进一步调度。因此，基于非竞争的随机接入过程仅包含两个步骤：步骤一为发送前导序列；步骤二为随机接入响应的发送。For a non-contention-based random access process, since the base station knows the user identity (which may also include C-RNTI in addition to the UE terminal identity), the UE can be assigned a preamble sequence. Therefore, when the UE sends the preamble sequence, it does not need to randomly select the sequence, but will use the allocated preamble sequence. After detecting the allocated preamble sequence, the base station will send a corresponding random access response, including information such as timing advance and uplink resource allocation. After receiving the random access response, the UE considers that uplink synchronization has been completed and waits for further scheduling by the base station. Therefore, the non-contention-based random access process only includes two steps: step one is sending the preamble sequence; step two is sending the random access response.
LTE中的随机接入过程适用于以下场景：The random access process in LTE applies to the following scenarios:
1.RRC空闲(RRC_IDLE)下的初始接入；1. Initial access under RRC idle (RRC_IDLE);
2.重新建立RRC连接；2. Re-establish the RRC connection;
3.小区切换；3. Cell switching;
4.RRC连接态下下行数据到达并请求随机接入过程(当上行处于非同步)；4. Downlink data arrives in the RRC connection state and requests the random access process (when the uplink is asynchronous);
5.RRC连接态下上行数据到达并请求随机接入过程(当上行处于非同步或是物理上行链路控制信道(Physical Uplink Control Channel，PUCCH)资源中未给调度请求分配资源)；5. Uplink data arrives in the RRC connection state and requests a random access process (when the uplink is asynchronous or the physical uplink control channel (Physical Uplink Control Channel, PUCCH) resource does not allocate resources to the scheduling request);
6.定位。6. Positioning.
在LTE中，上述六种场景使用相同的随机接入步骤。在新一代通信系统中，可能存在多个上行链路(UpLink，UL)可以提供随机接入信道资源。对于初始接入的UE，可以读取系统消息，获得所有的可用的随机接入信道资源信息，然后从中选择随机接入资源。但是对于切换的UE，在进行切换的随机接入之前，UE可以对目标小区(targeting cell)的信号强度进行测量，并反馈给服务小区(serving cell)。基于测量报告，与服务小区对应的网络节点，例如NodeB等，向UE发送包括用于随机接入的资源配置信息的切换命令。例如由服务小区来根据测量报告决定是否发起切换。若决定发起切换，则UE需要获得对应的随机接入信道资源配置信息，而当多个上行链路都有随机接入信道资源时，UE需要一种方式来获得自己的随机接入信道资源。In LTE, the above six scenarios use the same random access steps. In the new generation communication system, there may be multiple uplinks (UpLink, UL) that can provide random access channel resources. For the initial access UE, the system message can be read to obtain all available random access channel resource information, and then the random access resource can be selected from it. However, for the handover UE, before performing random access of the handover, the UE can measure the signal strength of the target cell (targeting cell) and feed it back to the serving cell (serving cell). Based on the measurement report, the network node corresponding to the serving cell, such as NodeB, etc., sends a handover command including resource configuration information for random access to the UE. For example, the serving cell decides whether to initiate a handover based on the measurement report. If it decides to initiate a handover, the UE needs to obtain the corresponding random access channel resource configuration information. When multiple uplinks have random access channel resources, the UE needs a way to obtain its own random access channel resources.
在通信系统中存在多个上行链路可供UE进行随机接入时，如主小区(Pcell)和次级小区(Scell)都存在时，可以由基站来配置UE使用哪一个小区的上行链路来进行随机接入。另一方面，在通信系统中，可能存在多个可用的上行链路的情况是存在普通上行链路(Common UL)和补充上行链路(Supplementary UL)，后者是针对更大覆盖范围内的信道条件不好的UE。因此，UE不一定要按照基站的指示来选择上行链路。有可能基站拥有的UE的测量报告并不及时，所以无法选择最准确的上行链路来进行随机接入，这对UE为实现快速切换并不有利。When there are multiple uplinks in the communication system for the UE to perform random access, such as when both the primary cell (Pcell) and the secondary cell (Scell) exist, the base station can configure which cell's uplink the UE uses. for random access. On the other hand, in a communication system, there may be multiple available uplinks, such as common uplink (Common UL) and supplementary uplink (Supplementary UL). The latter is for larger coverage areas. UE with poor channel conditions. Therefore, the UE does not necessarily have to follow the instructions of the base station to select the uplink. It is possible that the measurement reports of the UE owned by the base station are not timely, so the most accurate uplink cannot be selected for random access, which is not beneficial to the UE in achieving fast handover.
本发明实施例中，普通上行链路也可以称为第一上行链路，补充上行链路也可以称为第二上行链路。In the embodiment of the present invention, the ordinary uplink may also be called the first uplink, and the supplementary uplink may also be called the second uplink.
本公开提供了一种随机接入方法、网络节点和UE。当UE进行切换操作时，会先对目标小区进行测量，将测量结果反馈给服务小区。基于测量报告，与服务小区对应的网络节点，例如NodeB等，向UE发送包括用于随机接入的资源配置信息的切换命令。例如，由服务小区来基于测量报告判断是否进行切换，并且向UE通知目标小区的随机接入资源配置信息，其中可以由服务小区来直接确定使用的上行链路及其对应的随机接入资源配置信息。也可以是服务小区将所有可用的上行链路及其对应的随机接入资源配置信息以及对应的判决的阈值通知给UE，由UE来决定选择的上行链路及其对应的随机接入资源配置信息。此外，当从UE获得上述资源配置信息到UE真正开始切换随机接入还有一定的时间间隔时，UE可以利用最新的测量结果来选择上行链路及其对应的随机接入资源。因此，UE可以及时地选择最准确的上行链路来进行随机接入。The present disclosure provides a random access method, network node and UE. When the UE performs a handover operation, it will first measure the target cell and feed back the measurement results to the serving cell. Based on the measurement report, the network node corresponding to the serving cell, such as NodeB, etc., sends a handover command including resource configuration information for random access to the UE. For example, the serving cell determines whether to perform handover based on the measurement report, and notifies the UE of the random access resource configuration information of the target cell. The serving cell can directly determine the uplink used and its corresponding random access resource configuration. information. It is also possible that the serving cell notifies the UE of all available uplinks and their corresponding random access resource configuration information and the corresponding decision thresholds, and the UE determines the selected uplink and its corresponding random access resource configuration. information. In addition, when there is a certain time interval from when the UE obtains the above resource configuration information to when the UE actually starts switching random access, the UE can use the latest measurement results to select the uplink and its corresponding random access resources. Therefore, the UE can promptly select the most accurate uplink for random access.
以下将参考图2，对根据本公开第一示例性实施例的随机接入方法进行具体描述。The random access method according to the first exemplary embodiment of the present disclosure will be described in detail below with reference to FIG. 2 .
图2示出了根据本公开第一示例性实施例的随机接入方法200的示意流程图。如图2所示，在步骤S210中，与服务小区对应的网络节点(以下简称为“网络节点”)从UE接收关于对目标小区的信号的测量报告。在一些实施方式中，网络节点可以是基站、eNB、NodeB、无线接入网中心控制单元、无线接入网节点分布单元等。测量报告可以包括UE通过测量目标小区的同步信号块(SSB：Synchronization Signal Block)、或者配置的信道状态信息参考信号(CSI-RS：Channel Status Information-Reference Signal)而获得的目标小区的参考信号接收功率(RSRP：Reference Signal Receiving Power)。此外，该测量报告还可以包括要反馈给服务小区的SSB索引或CSI-RS索引。这里，UE可以通过网络节点配置的阈值thresholdl来确定要反馈给服务小区的一个或多个SSB索引或CSI-RS索引。具体地，例如，当UE测量的是基于SSB的RSRP(SSB_rsrp)时，如果SSB_rsrp≥threshold1，则UE记录该SSB的索引，并通知给服务小区。UE可以将满足阈值的所有M个SSB的索引通知给服务小区。备选地，UE可以从满足阈值的所有M个SSB中等概率地选择N(N＜M)个SSB，并将其索引通知给服务小区。用来判断的阈值threshold1和要选择的个数N由网络节点通知给UE。使用CSI-RS的情况与SSB类似，这里不再赘述。FIG. 2 shows a schematic flowchart of a random access method 200 according to the first exemplary embodiment of the present disclosure. As shown in Figure 2, in step S210, a network node corresponding to the serving cell (hereinafter referred to as "network node") receives a measurement report on the signal to the target cell from the UE. In some implementations, the network node may be a base station, eNB, NodeB, radio access network center control unit, radio access network node distribution unit, etc. The measurement report may include the reference signal reception of the target cell obtained by the UE by measuring the synchronization signal block (SSB: Synchronization Signal Block) of the target cell or the configured channel status information reference signal (CSI-RS: Channel Status Information-Reference Signal). Power (RSRP: Reference Signal Receiving Power). In addition, the measurement report may also include the SSB index or CSI-RS index to be fed back to the serving cell. Here, the UE can determine one or more SSB indexes or CSI-RS indexes to be fed back to the serving cell through the threshold thresholdl configured by the network node. Specifically, for example, when the UE measures the SSB-based RSRP (SSB_rsrp), if SSB_rsrp≥threshold1, the UE records the SSB index and notifies it to the serving cell. The UE may notify the serving cell of the indices of all M SSBs that meet the threshold. Alternatively, the UE may select N (N<M) SSBs with medium probability from all M SSBs that meet the threshold, and notify the serving cell of their indices. The threshold value threshold1 used for judgment and the number N to be selected are notified to the UE by the network node. The situation of using CSI-RS is similar to SSB and will not be described again here.
在步骤S220中，网络节点基于该测量报告(例如，目标小区的RSRP)，向UE发送包括用于随机接入的资源配置信息的切换命令。例如，网络节点确定UE是否从服务小区切换到目标小区。具体地，网络节点可以通过将UE报告的RSRP(RSRP_report)与预设的阈值(threshold_HO)进行比较，来确定UE是否需要进行切换。例如：如果RSRP_report＞threshold_HO，则确定UE需要进行切换；如果RSRP_report≤threshold_HO，则确定UE不需要进行切换。In step S220, the network node sends a handover command including resource configuration information for random access to the UE based on the measurement report (eg, RSRP of the target cell). For example, the network node determines whether the UE is handed over from the serving cell to the target cell. Specifically, the network node may determine whether the UE needs to perform handover by comparing the RSRP reported by the UE (RSRP_report) with a preset threshold (threshold_HO). For example: if RSRP_report>threshold_HO, it is determined that the UE needs to perform handover; if RSRP_report≤threshold_HO, it is determined that the UE does not need to perform handover.
如果确定UE需要从服务小区切换到目标小区，则网络节点向UE发送包括用于随机接入的资源配置信息的切换命令。该切换命令可以由无线电资源控制(RRC)信令，例如物理下行共享信道(PDSCH：Physical Downlink Shared Channel)或者下行链路控制信息(DCI：Downlink Control Information)(PDCCH)，来通知给UE。If it is determined that the UE needs to be handed over from the serving cell to the target cell, the network node sends a handover command including resource configuration information for random access to the UE. The handover command may be notified to the UE by Radio Resource Control (RRC) signaling, such as Physical Downlink Shared Channel (PDSCH) or Downlink Control Information (DCI) (PDCCH).
在切换命令中，网络节点向UE通知用于随机接入的资源配置信息。当目标小区中存在可以进行随机接入的多种上行链路(即都有随机接入资源配置)时，以目标小区中存在普通上行链路和补充上行链路为例，其中普通上行链路针对信道状态条件较好的UE，而补充上行链路针对于信道状态条件较差的UE。当UE报告测量的RSRP值时，UE并不清楚目标小区的用来判断选择普通上行链路还是补充上行链路的阈值threshold2，因此UE无法确定要使用的随机接入资源的配置信息。In the handover command, the network node notifies the UE of resource configuration information for random access. When there are multiple uplinks that can perform random access in the target cell (that is, all have random access resource configurations), take the existence of ordinary uplinks and supplementary uplinks in the target cell as an example, where the ordinary uplink The supplementary uplink is targeted at UEs with better channel status conditions, while the supplementary uplink is targeted at UEs with poor channel status conditions. When the UE reports the measured RSRP value, the UE does not know the threshold value threshold2 of the target cell used to determine whether to select the normal uplink or the supplementary uplink, so the UE cannot determine the configuration information of the random access resource to be used.
因此，根据本公开示例性实施例的由网络节点通知给UE的资源配置信息可以包括以下项中的至少一个：Therefore, the resource configuration information notified by the network node to the UE according to an exemplary embodiment of the present disclosure may include at least one of the following items:
1)基于普通上行链路的随机接入资源配置信息，其隐含通知UE使用普通上行链路进行随机接入；UE从获取到的随机接入资源配置中获得可用的随机接入的时频资源位置(包括带宽部分指示Bandwidth Part、随机接入信道资源配置信息)、和可用的随机接入前导码资源(根序列、循环移位值、可用的前导码个数等)；以及1) Based on the random access resource configuration information of the ordinary uplink, it implicitly informs the UE to use the ordinary uplink for random access; the UE obtains the available random access time and frequency from the obtained random access resource configuration. Resource location (including bandwidth part indication Bandwidth Part, random access channel resource configuration information), and available random access preamble resources (root sequence, cyclic shift value, number of available preambles, etc.); and
2)基于补充上行链路的随机接入资源配置信息，其隐含通知UE使用补充上行链路进行随机接入；UE从获取到的随机接入资源配置中获得可用的随机接入的时频资源位置(包括带宽部分指示Bandwidth Part、随机接入信道资源配置信息)、和可用的随机接入前导码资源(根序列、循环移位值、可用的前导码个数等)。2) The random access resource configuration information based on the supplementary uplink implicitly informs the UE to use the supplementary uplink for random access; the UE obtains the available random access time and frequency from the obtained random access resource configuration. Resource location (including bandwidth part indication Bandwidth Part, random access channel resource configuration information), and available random access preamble resources (root sequence, cyclic shift value, number of available preambles, etc.).
此外，该资源配置信息还可以包括以下项之一：In addition, the resource configuration information can also include one of the following items:
3)向UE指示是使用普通上行链路还是补充上行链路进行随机接入的指示；以及3) Indicate to the UE whether to use the normal uplink or the supplementary uplink for random access; and
4)用于使UE判断是使用普通上行链路还是补充上行链路进行随机接入的阈值threshold2。在此情况下，UE可以通过将所报告的目标小区的RSRP(RSRP_report)与阈值threshold2进行比较，来判断使用普通上行链路进行随机接入，还是使用补充上行链路进行随机接入。例如，如果RSRP_report＞threshold2，则UE选择使用普通上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源；如果RSRP_report≤threshold2，则UE选择使用补充上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源。4) Threshold2 for the UE to determine whether to use the normal uplink or the supplementary uplink for random access. In this case, the UE can determine whether to use the normal uplink for random access or the supplementary uplink for random access by comparing the reported RSRP of the target cell (RSRP_report) with the threshold value threshold2. For example, if RSRP_report>threshold2, the UE chooses to use the ordinary uplink, and determines the selected random access resource from the corresponding random access resource configuration information; if RSRP_report≤threshold2, the UE chooses to use the supplementary uplink, and The selected random access resource is determined from the corresponding random access resource configuration information.
上述资源配置信息可以包括在目标小区在其小区的系统信息中配置的可以用来UE做竞争性随机接入的资源配置信息中。也就是说，上述资源配置信息可以包括在网络节点向UE发送的用于竞争性随机接入的资源配置信息中。此外，上述资源配置信息还可以包括在网络节点向UE额外通知的专属的随机接入资源(RACH-ConfigDedicated)配置信息中。The above resource configuration information may be included in the resource configuration information configured by the target cell in the system information of its cell and can be used by the UE for competitive random access. That is to say, the above resource configuration information may be included in the resource configuration information for competitive random access sent by the network node to the UE. In addition, the above resource configuration information may also be included in the exclusive random access resource (RACH-ConfigDedicated) configuration information additionally notified by the network node to the UE.
因此，如果UE没有被配置专属的随机接入资源，则其通过配置的随机接入资源配置信息，选择随机接入资源(随机接入信道和随机接入前导码)来发起竞争性随机接入。如果UE被配置了专属的随机接入资源，即UE被配置了明确的随机接入资源(具体的随机接入信道和/或具体的随机接入前导码)，则其使用所配置的专属的随机接入资源发起随机接入。可以将用于确定是选择普通上行链路还是补充上行链路的阈值threshold2放入专属的随机接入资源(RACH-ConfigDedicated)配置信息中，如下所示：Therefore, if the UE is not configured with dedicated random access resources, it selects random access resources (random access channel and random access preamble) through the configured random access resource configuration information to initiate competitive random access. . If the UE is configured with exclusive random access resources, that is, the UE is configured with explicit random access resources (specific random access channel and/or specific random access preamble), it uses the configured exclusive random access resource. Random access resources initiate random access. The threshold threshold2 used to determine whether to select a normal uplink or a supplementary uplink can be put into the dedicated random access resource (RACH-ConfigDedicated) configuration information, as follows:
在从网络节点接收到上述资源配置信息后，UE可以在配置的或选择的上行链路内完成所有的随机接入上行传输(msg1、msg3以及可能的msg3的重传)。After receiving the above resource configuration information from the network node, the UE can complete all random access uplink transmissions (msg1, msg3 and possible retransmission of msg3) within the configured or selected uplink.
此外，网络节点向UE发送的切换命令还可以包括：UE报告的SSB与对应的随机接入资源的映射关系；或UE报告的CSI-RS与对应的随机接入资源的映射关系。因此，当UE选择了一个SSB或CSI-RS之后，可以通过与对应的随机接入资源的映射关系，找到可用的随机接入资源。In addition, the handover command sent by the network node to the UE may also include: the mapping relationship between the SSB reported by the UE and the corresponding random access resources; or the mapping relationship between the CSI-RS reported by the UE and the corresponding random access resources. Therefore, when the UE selects an SSB or CSI-RS, it can find available random access resources through the mapping relationship with the corresponding random access resources.
图3示出了根据本公开示例性实施例的UE选择随机接入信道的示意图。FIG. 3 shows a schematic diagram of a UE selecting a random access channel according to an exemplary embodiment of the present disclosure.
在图3中，UE已经基于检测到的RARP值选择了补充上行链路。然后，UE可以基于来自服务小区的网络节点的切换命令来获取要使用的随机接入信道资源。该切换命令可以包括UE报告的SSB与对应的随机接入资源的映射关系。该切换命令还可以包括用于UE选择随机接入资源的阈值threshold3。当UE向网络节点汇报了多个可用的SSB时，在进行随机接入之前，UE可以从所述多个可用的SSB中选择大于或等于阈值threshold3的SSB，然后通过选择的SSB以及SSB与随机接入信道的映射关系，找到对应的随机接入信道资源。例如，UE通过服务小区的网络节点通知的SSB与随机接入信道的映射关系(例如1对1映射)，从选择的SSB(如图3中所示的SSB2)找到对应的随机接入信道资源(如图3中所示的随机接入信道资源2)。随机接入信道资源可以包括可用的随机接入前导码资源、随机接入信道、时频资源等。阈值threshold3可以在随机接入信道资源配置中通知给UE，也可以通过UE专属的随机接入配置通知给UE。In Figure 3, the UE has selected the supplementary uplink based on the detected RARP value. Then, the UE can obtain the random access channel resources to be used based on the handover command from the network node of the serving cell. The handover command may include a mapping relationship between the SSB reported by the UE and the corresponding random access resource. The switching command may also include a threshold value threshold3 for the UE to select random access resources. When the UE reports multiple available SSBs to the network node, before performing random access, the UE can select an SSB greater than or equal to threshold 3 from the multiple available SSBs, and then compare the selected SSB and the SSB with the random access Access channel mapping relationship to find the corresponding random access channel resources. For example, the UE finds the corresponding random access channel resource from the selected SSB (SSB2 as shown in Figure 3) through the mapping relationship (such as 1-to-1 mapping) between the SSB and the random access channel notified by the network node of the serving cell. (Random access channel resource 2 as shown in Figure 3). Random access channel resources may include available random access preamble resources, random access channels, time-frequency resources, etc. The threshold threshold3 can be notified to the UE in the random access channel resource configuration, or it can be notified to the UE through the UE-specific random access configuration.
之后UE在专属的随机接入资源指示中获取确定的随机接入前导码，从而确定随机接入资源。需要说明的是，此处虽然以1对1映射为例，但是SSB与随机接入信道的映射关系不限于此，其也可以是1对多、或多对1映射。使用CSI-RS的情况与SSB类似，这里不再赘述。The UE then obtains the determined random access preamble in the dedicated random access resource indication, thereby determining the random access resource. It should be noted that although 1-to-1 mapping is taken as an example here, the mapping relationship between SSB and random access channels is not limited to this, and it may also be 1-to-many or many-to-1 mapping. The situation of using CSI-RS is similar to SSB and will not be described again here.
以下将参考图4，对根据本公开第二示例性实施例的在UE处进行随机接入的方法进行具体描述。A method of performing random access at a UE according to a second exemplary embodiment of the present disclosure will be described in detail below with reference to FIG. 4 .
图4示出了根据本公开第二示例性实施例的在UE处进行随机接入的方法400的示意流程图。如图4所示，在步骤S410中，UE针对目标小区的信号进行测量。在步骤S420中，UE向与服务小区对应的网络节点发送关于目标小区的信号的测量报告。该测量报告可以包括UE通过测量目标小区的同步信号块(SSB)、或者配置的信道状态信息参考信号(CSI-RS)而获得的目标小区的参考信号接收功率(RSRP)。此外，该测量报告还可以包括要反馈给服务小区的SSB索引或CSI-RS索引。这里，UE可以通过网络节点配置的阈值threshold1来确定要反馈给服务小区的一个或多个SSB索引或CSI-RS索引。具体地，例如，当UE测量的是基于SSB的RSRP(SSB_rsrp)时，如果SSB_rsrp≥threshold1，则UE记录该SSB的索引，并通知给服务小区。UE可以将满足阈值的所有M个SSB的索引通知给服务小区。备选地，UE可以从满足阈值的所有M个SSB中等概率地选择N(N＜M)个SSB，并将其索引通知给服务小区。用来判断的阈值threshold1和要选择的个数N由网络节点通知给UE。使用CSI-RS的情况与SSB类似，这里不再赘述。FIG. 4 shows a schematic flowchart of a method 400 for random access at a UE according to the second exemplary embodiment of the present disclosure. As shown in Figure 4, in step S410, the UE measures the signal of the target cell. In step S420, the UE sends a measurement report on the signal of the target cell to the network node corresponding to the serving cell. The measurement report may include the reference signal received power (RSRP) of the target cell obtained by the UE by measuring the synchronization signal block (SSB) of the target cell or the configured channel state information reference signal (CSI-RS). In addition, the measurement report may also include the SSB index or CSI-RS index to be fed back to the serving cell. Here, the UE can determine one or more SSB indexes or CSI-RS indexes to be fed back to the serving cell through the threshold threshold1 configured by the network node. Specifically, for example, when the UE measures the SSB-based RSRP (SSB_rsrp), if SSB_rsrp≥threshold1, the UE records the SSB index and notifies it to the serving cell. The UE may notify the serving cell of the indices of all M SSBs that meet the threshold. Alternatively, the UE may select N (N<M) SSBs with medium probability from all M SSBs that meet the threshold, and notify the serving cell of their indices. The threshold value threshold1 used for judgment and the number N to be selected are notified to the UE by the network node. The situation of using CSI-RS is similar to SSB and will not be described again here.
在步骤S430中，UE从网络节点接收包括用于随机接入的资源配置信息的切换命令。该切换命令可以是网络节点基于来自UE的测量报告(例如目标小区的RSRP)而做出的。具体地，网络节点可以通过将UE报告的RSRP(RSRP_report)与预设的阈值(threshold_HO)进行比较，来确定UE是否需要进行切换。例如：如果RSRP_report＞threshold_HO，则确定UE需要进行切换；如果RSRP_report≤threshold_HO，则确定UE不需要进行切换。网络节点可以通过无线电资源控制(RRC)信令(PDSCH)或者下行链路控制信息(DCI)(PDCCH)来将切换命令通知给UE。In step S430, the UE receives a handover command including resource configuration information for random access from the network node. The handover command may be made by the network node based on measurement reports from the UE (eg RSRP of the target cell). Specifically, the network node may determine whether the UE needs to perform handover by comparing the RSRP reported by the UE (RSRP_report) with a preset threshold (threshold_HO). For example: if RSRP_report>threshold_HO, it is determined that the UE needs to perform handover; if RSRP_report≤threshold_HO, it is determined that the UE does not need to perform handover. The network node may notify the UE of the handover command through Radio Resource Control (RRC) signaling (PDSCH) or Downlink Control Information (DCI) (PDCCH).
在切换命令中，网络节点向UE通知用于随机接入的资源配置信息。当目标小区中存在可以进行随机接入的多种上行链路(即都有随机接入资源配置)时，以目标小区中存在普通上行链路和补充上行链路为例，其中普通上行链路针对信道状态条件较好的UE，而补充上行链路针对于信道状态条件较差的UE。当UE报告测量的RSRP值时，UE并不清楚目标小区的用来判断选择普通上行链路还是补充上行链路的阈值threshold2，因此UE无法确定要使用的随机接入资源的配置信息。In the handover command, the network node notifies the UE of resource configuration information for random access. When there are multiple uplinks that can perform random access in the target cell (that is, all have random access resource configurations), take the existence of ordinary uplinks and supplementary uplinks in the target cell as an example, where the ordinary uplink The supplementary uplink is targeted at UEs with better channel status conditions, while the supplementary uplink is targeted at UEs with poor channel status conditions. When the UE reports the measured RSRP value, the UE does not know the threshold value threshold2 of the target cell used to determine whether to select the normal uplink or the supplementary uplink, so the UE cannot determine the configuration information of the random access resource to be used.
因此，根据本公开示例性实施例的由网络节点通知给UE的资源配置信息可以包括以下项之一：Therefore, the resource configuration information notified by the network node to the UE according to an exemplary embodiment of the present disclosure may include one of the following items:
1)基于普通上行链路的随机接入资源配置信息，其隐含通知UE使用普通上行链路进行随机接入；UE从获取到的随机接入资源配置中获得可用的随机接入的时频资源位置(包括带宽部分指示Bandwidth Part、随机接入信道资源配置信息)、和可用的随机接入前导码资源(根序列、循环移位值、可用的前导码个数等)；1) Based on the random access resource configuration information of the ordinary uplink, it implicitly informs the UE to use the ordinary uplink for random access; the UE obtains the available random access time and frequency from the obtained random access resource configuration. Resource location (including bandwidth part indication Bandwidth Part, random access channel resource configuration information), and available random access preamble resources (root sequence, cyclic shift value, number of available preambles, etc.);
2)基于补充上行链路的随机接入资源配置信息，其隐含通知UE使用补充上行链路进行随机接入；UE从获取到的随机接入资源配置中获得可用的随机接入的时频资源位置(包括带宽部分指示Bandwidth Part、随机接入信道资源配置信息)、和可用的随机接入前导码资源(根序列、循环移位值、可用的前导码个数等)。2) The random access resource configuration information based on the supplementary uplink implicitly informs the UE to use the supplementary uplink for random access; the UE obtains the available random access time and frequency from the obtained random access resource configuration. Resource location (including bandwidth part indication Bandwidth Part, random access channel resource configuration information), and available random access preamble resources (root sequence, cyclic shift value, number of available preambles, etc.).
此外，该资源配置信息还可以包括以下项之一：In addition, the resource configuration information can also include one of the following items:
3)向UE指示是使用普通上行链路还是补充上行链路进行随机接入的指示；以及3) Indicate to the UE whether to use the normal uplink or the supplementary uplink for random access; and
4)用于使UE判断是使用普通上行链路还是补充上行链路进行随机接入的阈值threshold2。在此情况下，UE可以通过将所报告的目标小区的RSRP(RSRP_report)与阈值threshold2进行比较，来判断使用普通上行链路进行随机接入，还是使用补充上行链路进行随机接入。例如，如果RSRP_report＞threshold2，则UE选择使用普通上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源；如果RSRP_report≤threshold2，则UE选择使用补充上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源。4) Threshold2 for the UE to determine whether to use the normal uplink or the supplementary uplink for random access. In this case, the UE can determine whether to use the normal uplink for random access or the supplementary uplink for random access by comparing the reported RSRP of the target cell (RSRP_report) with the threshold value threshold2. For example, if RSRP_report>threshold2, the UE chooses to use the ordinary uplink, and determines the selected random access resource from the corresponding random access resource configuration information; if RSRP_report≤threshold2, the UE chooses to use the supplementary uplink, and The selected random access resource is determined from the corresponding random access resource configuration information.
上述资源配置信息可以包括在目标小区在其小区的系统信息中配置的可以用来UE做竞争性随机接入的资源配置信息中。也就是说，上述资源配置信息可以包括在网络节点向UE发送的用于竞争性随机接入的资源配置信息中。此外，上述资源配置信息还可以包括在网络节点向UE额外通知的专属的随机接入资源(RACH-ConfigDedicated)配置信息中。The above resource configuration information may be included in the resource configuration information configured by the target cell in the system information of its cell and can be used by the UE for competitive random access. That is to say, the above resource configuration information may be included in the resource configuration information for competitive random access sent by the network node to the UE. In addition, the above resource configuration information may also be included in the exclusive random access resource (RACH-ConfigDedicated) configuration information additionally notified by the network node to the UE.
因此，如果UE没有被配置专属的随机接入资源，则其通过配置的随机接入资源配置信息，选择随机接入资源(随机接入信道和随机接入前导码)来发起竞争性随机接入。如果UE被配置了专属的随机接入资源，即UE被配置了明确的随机接入资源(具体的随机接入信道和/或具体的随机接入前导码)，则其使用所配置的专属的随机接入资源发起随机接入。可以将用于确定是选择普通上行链路还是补充上行链路的阈值threshold2放入专属的随机接入资源(RACH-ConfigDedicated)配置信息中，如下所示：Therefore, if the UE is not configured with dedicated random access resources, it selects random access resources (random access channel and random access preamble) through the configured random access resource configuration information to initiate competitive random access. . If the UE is configured with exclusive random access resources, that is, the UE is configured with explicit random access resources (specific random access channel and/or specific random access preamble), it uses the configured exclusive random access resource. Random access resources initiate random access. The threshold threshold2 used to determine whether to select a normal uplink or a supplementary uplink can be put into the dedicated random access resource (RACH-ConfigDedicated) configuration information, as follows:
在从网络节点接收到上述资源配置信息后，在步骤S440中，UE可以获取随机接入资源配置和指示并基于随机接入资源配置和指示在目标小区进行随机接入。对于上述情况1)、2)和3)，UE根据网络节点指示的普通上行链路或补充上行链路进行随机接入。对于上述情况4)，UE根据由网络节点发送的资源配置信息中所包括的阈值threshold2，由UE自身选择对应的随机资源配置(即，普通上行链路或补充上行链路)，并且确定要使用的随机资源。在一个示例性实施例中，在UE真正进行切换的随机接入时，该UE可以对目标小区进行新的下行测量，并获得新的RSRP(RSRP_latest)，且RSRP_latest不一定与RSRP_report相同。此时，如果RSRP_latest＞threshold2，则UE选择使用普通上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源；如果RSRP_latest≤threshold2，则UE选择使用补充上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源。After receiving the above resource configuration information from the network node, in step S440, the UE may obtain the random access resource configuration and indication and perform random access in the target cell based on the random access resource configuration and indication. For the above situations 1), 2) and 3), the UE performs random access according to the normal uplink or supplementary uplink indicated by the network node. For the above case 4), the UE itself selects the corresponding random resource configuration (ie, ordinary uplink or supplementary uplink) according to the threshold threshold2 included in the resource configuration information sent by the network node, and determines to use random resources. In an exemplary embodiment, when the UE actually performs random access during handover, the UE can perform new downlink measurements on the target cell and obtain a new RSRP (RSRP_latest), and RSRP_latest is not necessarily the same as RSRP_report. At this time, if RSRP_latest>threshold2, the UE chooses to use the ordinary uplink, and determines the selected random access resource from the corresponding random access resource configuration information; if RSRP_latest≤threshold2, the UE chooses to use the supplementary uplink, And determine the selected random access resource from the corresponding random access resource configuration information.
此外，网络节点向UE发送的切换命令还可以包括：UE报告的SSB与对应的随机接入资源的映射关系；或UE报告的CSI-RS与对应的随机接入资源的映射关系。因此，当UE选择了一个SSB或CSI-RS之后，可以通过与对应的随机接入资源的映射关系，找到可用的随机接入资源。以上已经参考图3详细描述了本公开示例性实施例的UE选择随机接入信道的方式，此处不再赘述。In addition, the handover command sent by the network node to the UE may also include: the mapping relationship between the SSB reported by the UE and the corresponding random access resources; or the mapping relationship between the CSI-RS reported by the UE and the corresponding random access resources. Therefore, when the UE selects an SSB or CSI-RS, it can find available random access resources through the mapping relationship with the corresponding random access resources. The manner in which a UE selects a random access channel according to an exemplary embodiment of the present disclosure has been described in detail above with reference to FIG. 3 , and will not be described again here.
以下将参照图5，对根据本公开示例性实施例的设备的示意性结构进行描述。图5为根据本公开示例性实施例的设备500的结构示意图。设备500可以用于执行参考图2和图4描述的方法200和400。为了简明，在此对根据本公开示例性实施例的设备的示意性结构进行描述，而省略了如前参考图2和图4描述的方法中已经详述过的细节。The schematic structure of a device according to an exemplary embodiment of the present disclosure will be described below with reference to FIG. 5 . Figure 5 is a schematic structural diagram of a device 500 according to an exemplary embodiment of the present disclosure. The apparatus 500 may be used to perform the methods 200 and 400 described with reference to FIGS. 2 and 4 . For the sake of simplicity, a schematic structure of a device according to an exemplary embodiment of the present disclosure is described here, and details that have been described in detail in the method as previously described with reference to FIGS. 2 and 4 are omitted.
如图5所示，设备500可以包括用于外部通信的通信接口501；处理单元或处理器503，该处理器503可以是单个单元或者多个单元的组合，用于执行方法的不同步骤；存储器505，其中存储有计算机可执行指令。As shown in Figure 5, the device 500 may include a communication interface 501 for external communication; a processing unit or processor 503, which may be a single unit or a combination of multiple units for performing different steps of the method; a memory 505, in which computer-executable instructions are stored.
根据第一示例性实施例，所述指令在被处理器503执行时，使处理器503执行以下操作：从用户设备UE接收关于对目标小区的信号的测量报告(如步骤S210中所述，此处不再赘述)；基于测量报告，向UE发送包括用于随机接入的资源配置信息的切换命令(如步骤S220中所述，此处不再赘述)。这样，设备500可以具体化为执行如前参考图2描述的方法200的网络节点。According to the first exemplary embodiment, the instructions, when executed by the processor 503, cause the processor 503 to perform the following operations: receive a measurement report on the signal of the target cell from the user equipment UE (as described in step S210, where (no details will be described here); based on the measurement report, send a handover command including the resource configuration information for random access to the UE (as described in step S220, no details will be described here). In this way, the device 500 may be embodied as a network node performing the method 200 as previously described with reference to FIG. 2 .
根据第二示例性实施例，所述指令在被处理器503执行时，使处理器503执行以下操作：针对目标小区的信号进行测量(如步骤S410中所述，此处不再赘述)；向与服务小区对应的网络节点发送关于目标小区的信号的测量报告(如步骤S420中所述，此处不再赘述)；从网络节点接收包括用于随机接入的资源配置信息的切换命令(如步骤S430中所述，此处不再赘述)；以及基于资源配置信息在目标小区进行随机接入(如步骤S440中所述，此处不再赘述)。这样，设备500可以具体化为执行如前参考图4描述的方法400的用户设备(UE)。According to the second exemplary embodiment, the instructions, when executed by the processor 503, cause the processor 503 to perform the following operations: measure the signal of the target cell (as described in step S410, which will not be described again here); The network node corresponding to the serving cell sends a measurement report about the signal of the target cell (as described in step S420, which will not be repeated here); receives a handover command including resource configuration information for random access from the network node (such as (described in step S430, which will not be described in detail here); and perform random access in the target cell based on the resource configuration information (as described in step S440, which will not be described in detail here). In this way, the device 500 may be embodied as a user equipment (UE) performing the method 400 as previously described with reference to FIG. 4 .
下面参考图6对根据本公开示例性实施例的方法的设备间的消息接发进行描述。Messaging between devices according to the method according to an exemplary embodiment of the present disclosure is described below with reference to FIG. 6 .
图6示出了应用了根据本公开示例性实施例的方法600的设备间的信号流图。FIG. 6 shows a signal flow diagram between devices to which the method 600 according to an exemplary embodiment of the present disclosure is applied.
在步骤S610中，用户设备(UE)针对目标小区的信号进行测量。该测量可以是基于目标小区的同步信号块(SSB)、或者配置的信道状态信息参考信号(CSI-RS)对目标小区的参考信号接收功率(RSRP)的测量。In step S610, the user equipment (UE) performs measurements on the signal of the target cell. The measurement may be a measurement of the reference signal received power (RSRP) of the target cell based on the synchronization signal block (SSB) of the target cell or the configured channel state information reference signal (CSI-RS).
之后，在步骤S620中，UE通过上行信道向网络节点发送测量的报告，例如，测量的目标小区的RSRP值。Afterwards, in step S620, the UE sends a measurement report to the network node through the uplink channel, for example, the measured RSRP value of the target cell.
在步骤S630中，网络节点读取来自UE的测量报告，并基于该测量报告确定UE需要从服务小区切换到目标小区。已经在上面的第一示例性实施例和第二示例性实施例中详细描述了关于切换操作的确定，这里不再赘述。In step S630, the network node reads the measurement report from the UE, and determines based on the measurement report that the UE needs to switch from the serving cell to the target cell. The determination regarding the switching operation has been described in detail in the first and second exemplary embodiments above, and will not be described again here.
在网络节点确定需要对UE进行切换操作的情况下，在步骤S640中，网络节点通过下行信道向UE发送切换命令。在切换命令中，网络节点向UE通知用于随机接入的资源配置信息。当目标小区中存在可以进行随机接入的多种上行链路(即都有随机接入资源配置)时，以目标小区中存在普通上行链路和补充上行链路为例，其中普通上行链路针对信道状态条件较好的UE，而补充上行链路针对于信道状态条件较差的UE。当UE报告测量的RSRP值时，UE并不清楚目标小区的用来判断选择普通上行链路还是补充上行链路的阈值threshold2，因此UE无法确定要使用的随机接入资源的配置信息。When the network node determines that a handover operation needs to be performed on the UE, in step S640, the network node sends a handover command to the UE through the downlink channel. In the handover command, the network node notifies the UE of resource configuration information for random access. When there are multiple uplinks that can perform random access in the target cell (that is, all have random access resource configurations), take the existence of ordinary uplinks and supplementary uplinks in the target cell as an example, where the ordinary uplink The supplementary uplink is targeted at UEs with better channel status conditions, while the supplementary uplink is targeted at UEs with poor channel status conditions. When the UE reports the measured RSRP value, the UE does not know the threshold value threshold2 of the target cell used to determine whether to select the normal uplink or the supplementary uplink, so the UE cannot determine the configuration information of the random access resource to be used.
因此，根据本公开示例性实施例的由网络节点通知给UE的资源配置信息可以包括以下项之一：Therefore, the resource configuration information notified by the network node to the UE according to an exemplary embodiment of the present disclosure may include one of the following items:
1)基于普通上行链路的随机接入资源配置信息，其隐含通知UE使用普通上行链路进行随机接入；UE从获取到的随机接入资源配置中获得可用的随机接入的时频资源位置(包括带宽部分指示Bandwidth Part、随机接入信道资源配置信息)、和可用的随机接入前导码资源(根序列、循环移位值、可用的前导码个数等)；1) Based on the random access resource configuration information of the ordinary uplink, it implicitly informs the UE to use the ordinary uplink for random access; the UE obtains the available random access time and frequency from the obtained random access resource configuration. Resource location (including bandwidth part indication Bandwidth Part, random access channel resource configuration information), and available random access preamble resources (root sequence, cyclic shift value, number of available preambles, etc.);
2)基于补充上行链路的随机接入资源配置信息，其隐含通知UE使用补充上行链路进行随机接入；UE从获取到的随机接入资源配置中获得可用的随机接入的时频资源位置(包括带宽部分指示Bandwidth Part、随机接入信道资源配置信息)、和可用的随机接入前导码资源(根序列、循环移位值、可用的前导码个数等)。2) The random access resource configuration information based on the supplementary uplink implicitly informs the UE to use the supplementary uplink for random access; the UE obtains the available random access time and frequency from the obtained random access resource configuration. Resource location (including bandwidth part indication Bandwidth Part, random access channel resource configuration information), and available random access preamble resources (root sequence, cyclic shift value, number of available preambles, etc.).
此外，该资源配置信息还可以包括以下项之一：In addition, the resource configuration information can also include one of the following items:
3)向UE指示是使用普通上行链路还是补充上行链路进行随机接入的指示；以及3) Indicate to the UE whether to use the normal uplink or the supplementary uplink for random access; and
4)用于使UE判断是使用普通上行链路还是补充上行链路进行随机接入的阈值threshold2。在此情况下，UE可以通过将所报告的目标小区的RSRP(RSRP_report)与阈值threshold2进行比较，来判断使用普通上行链路进行随机接入，还是使用补充上行链路进行随机接入。例如，如果RSRP_report＞threshold2，则UE选择使用普通上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源；如果RSRP_report≤threshold2，则UE选择使用补充上行链路，并从对应的随机接入资源配置信息确定所选的随机接入资源。4) Threshold2 for the UE to determine whether to use the normal uplink or the supplementary uplink for random access. In this case, the UE can determine whether to use the normal uplink for random access or the supplementary uplink for random access by comparing the reported RSRP of the target cell (RSRP_report) with the threshold value threshold2. For example, if RSRP_report>threshold2, the UE chooses to use the ordinary uplink, and determines the selected random access resource from the corresponding random access resource configuration information; if RSRP_report≤threshold2, the UE chooses to use the supplementary uplink, and The selected random access resource is determined from the corresponding random access resource configuration information.
上述资源配置信息可以包括在目标小区在其小区的系统信息中配置的可以用来UE做竞争性随机接入的资源配置信息中。也就是说，上述资源配置信息可以包括在网络节点向UE发送的用于竞争性随机接入的资源配置信息中。此外，上述资源配置信息还可以包括在网络节点向UE额外通知的专属的随机接入资源(RACH-ConfigDedicated)配置信息中。The above resource configuration information may be included in the resource configuration information configured by the target cell in the system information of its cell and can be used by the UE for competitive random access. That is to say, the above resource configuration information may be included in the resource configuration information for competitive random access sent by the network node to the UE. In addition, the above resource configuration information may also be included in the exclusive random access resource (RACH-ConfigDedicated) configuration information additionally notified by the network node to the UE.
在从网络节点接收到上述资源配置信息之后，在步骤S650中，UE可以从资源配置信息中获取随机接入资源配置和指示。对于上述情况1)、2)和3)，UE根据网络节点指示的普通上行链路或补充上行链路进行随机接入。对于上述情况4)，UE根据由网络节点发送的资源配置信息中所包括的阈值threshold2，由UE自身选择对应的随机资源配置(即，普通上行链路或补充上行链路)，并且确定要使用的随机资源。After receiving the above resource configuration information from the network node, in step S650, the UE may obtain the random access resource configuration and indication from the resource configuration information. For the above situations 1), 2) and 3), the UE performs random access according to the normal uplink or supplementary uplink indicated by the network node. For the above case 4), the UE itself selects the corresponding random resource configuration (ie, ordinary uplink or supplementary uplink) according to the threshold threshold2 included in the resource configuration information sent by the network node, and determines to use random resources.
由以上技术方案可以看出，当UE进行切换操作时，会先对目标小区进行测量，将测量结果反馈给服务小区的网络节点，由网络节点来判断是否进行切换，并且向UE通知目标小区的随机接入资源配置信息，其中可以由网络节点来直接确定使用的上行链路及其对应的随机接入资源配置信息，也可以是网络节点将所有可用的上行链路及其对应的随机接入资源配置信息以及对应的判决的阈值通知给UE，由UE来决定选择的上行链路及其对应的随机接入资源配置信息。此外，当从UE获得上述资源配置信息到UE真正开始切换随机接入存在一定的时间间隔时，UE可以利用最新的测量结果来选择上行链路及其对应的随机接入资源。因此，UE可以及时地选择最准确的上行链路来进行随机接入。It can be seen from the above technical solution that when the UE performs a handover operation, the target cell will be measured first, and the measurement results will be fed back to the network node of the serving cell. The network node will determine whether to perform handover and notify the UE of the target cell. Random access resource configuration information, in which the network node can directly determine the uplink used and its corresponding random access resource configuration information, or the network node can determine all available uplinks and their corresponding random access The resource configuration information and the corresponding decision threshold are notified to the UE, and the UE decides the selected uplink and its corresponding random access resource configuration information. In addition, when there is a certain time interval from when the UE obtains the above resource configuration information to when the UE actually starts switching random access, the UE can use the latest measurement results to select the uplink and its corresponding random access resources. Therefore, the UE can promptly select the most accurate uplink for random access.
如本领域技术人员可以理解的那样，运行在根据本公开的设备上的程序可以是通过控制中央处理单元(CPU)来使计算机实现本公开的实施例功能的程序。该程序或由该程序处理的信息可以临时存储在易失性存储器(如随机存取存储器RAM)、硬盘驱动器(HDD)、非易失性存储器(如闪速存储器)、或其他存储器系统中。As those skilled in the art can understand, a program running on a device according to the present disclosure may be a program that causes the computer to implement the functions of the embodiments of the present disclosure by controlling a central processing unit (CPU). The program or information processed by the program may be temporarily stored in volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory systems.
用于实现本公开各实施例功能的程序可以记录在计算机可读记录介质上。可以通过使计算机系统读取记录在所述记录介质上的程序并执行这些程序来实现相应的功能。此处的所谓“计算机系统”可以是嵌入在该设备中的计算机系统，可以包括操作系统或硬件(如外围设备)。“计算机可读记录介质”可以是半导体记录介质、光学记录介质、磁性记录介质、短时动态存储程序的记录介质、或计算机可读的任何其他记录介质。Programs for realizing the functions of each embodiment of the present disclosure may be recorded on a computer-readable recording medium. Corresponding functions can be realized by causing the computer system to read programs recorded on the recording medium and execute these programs. The so-called "computer system" here may be a computer system embedded in the device, which may include an operating system or hardware (such as peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium for short-term dynamic storage of a program, or any other recording medium readable by a computer.
用在上述实施例中的设备的各种特征或功能模块可以通过电路(例如，单片或多片集成电路)来实现或执行。设计用于执行本说明书所描述的功能的电路可以包括通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)、或其他可编程逻辑器件、分立的门或晶体管逻辑、分立的硬件组件、或上述器件的任意组合。通用处理器可以是微处理器，也可以是任何现有的处理器、控制器、微控制器、或状态机。上述电路可以是数字电路，也可以是模拟电路。因半导体技术的进步而出现了替代现有集成电路的新的集成电路技术的情况下，本公开的一个或多个实施例也可以使用这些新的集成电路技术来实现。Various features or functional modules of the devices used in the above-described embodiments may be implemented or performed by circuits (eg, single-chip or multi-chip integrated circuits). Circuitry designed to perform the functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above. A general-purpose processor can be a microprocessor or any existing processor, controller, microcontroller, or state machine. The above circuit may be a digital circuit or an analog circuit. When new integrated circuit technologies emerge to replace existing integrated circuits due to advances in semiconductor technology, one or more embodiments of the present disclosure may also be implemented using these new integrated circuit technologies.
如上，已经参考附图对本公开的实施例进行了详细描述。但是，具体的结构并不局限于上述实施例，本公开也包括不偏离本公开主旨的任何设计改动。另外，可以在权利要求的范围内对本公开进行多种改动，通过适当地组合不同实施例所公开的技术手段所得到的实施例也包含在本公开的技术范围内。此外，上述实施例中所描述的具有相同效果的组件可以相互替代。As above, the embodiments of the present disclosure have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-described embodiment, and the present disclosure also includes any design changes that do not deviate from the gist of the present disclosure. In addition, various modifications can be made to the present disclosure within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. Furthermore, components having the same effect described in the above embodiments may be substituted for each other.
以上描述仅为本申请的较佳实施例以及对所运用技术原理的说明。本领域技术人员应当理解，本申请中所涉及的发明范围，并不限于上述技术特征的特定组合而成的技术方案，同时也应涵盖在不脱离所述发明构思的情况下，由上述技术特征或其等同特征进行任意组合而形成的其它技术方案。例如上述特征与本申请中公开的(但不限于)具有类似功能的技术特征进行互相替换而形成的技术方案。The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by a specific combination of the above technical features, but should also cover any combination of the above technical features without departing from the concept of the invention. or other technical solutions formed by any combination of equivalent features. For example, a technical solution is formed by replacing the above features with technical features with similar functions disclosed in this application (but not limited to).
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