CN110012479A - Network element in a kind of load management method and functions of wireless - Google Patents
Network element in a kind of load management method and functions of wireless Download PDFInfo
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Abstract
本发明提供一种负载管理方法及无线集中网元，该方法包括：获取一个或多个无线分布网元的负载信息；根据所述一个或多个无线分布网元的负载信息，进行负载管理或控制；本发明实施例中无线集中网元依据一个或多个无线分布网元的负载信息来进行负载管理或控制，能够避免选择负载率较高的无线分布网元，提升负载管理的性能；从而使得用户能够接入资源有空闲的无线集中网元，提高了频谱利用率，最终能够提高系统吞吐量。
The present invention provides a load management method and a wireless centralized network element. The method includes: acquiring load information of one or more wireless distribution network elements; performing load management or control; in the embodiment of the present invention, the wireless centralized network element performs load management or control according to the load information of one or more wireless distribution network elements, which can avoid selecting a wireless distribution network element with a higher load rate and improve the performance of load management; thus This enables users to access wireless centralized network elements with idle resources, improves spectrum utilization, and ultimately improves system throughput.
Description
技术领域technical field
本发明涉及通信技术领域，特别的指一种负载管理方法及无线集中网元。The present invention relates to the technical field of communications, in particular to a load management method and a wireless centralized network element.
背景技术Background technique
目前多连接场景下的协作簇选择，一般是根据RSRP(Reference SignalReceiving Power，参考信号接收功率)选择基站，所有的用户用一样的门限，这样所有的用户采用统一的选取标准。Currently, the cooperative cluster selection in a multi-connection scenario is generally based on RSRP (Reference Signal Receiving Power, reference signal receiving power) to select a base station, and all users use the same threshold, so that all users use a unified selection standard.
目前多连接簇的选择方案依靠终端的测量上报，采用统一的RSRP/RSRQ(Reference Signal Receiving Quality，参考信号接收质量)门限，虽然协作基站的选择更简单，但是选出的门限不一定适合所有的用户，故现有的多连接簇选择方案存在如下缺点：At present, the multi-connection cluster selection scheme relies on the measurement and reporting of the terminal, and adopts a unified RSRP/RSRQ (Reference Signal Receiving Quality) threshold. Although the selection of cooperative base stations is simpler, the selected threshold may not be suitable for all Therefore, the existing multi-connection cluster selection scheme has the following shortcomings:
1)选出的多连接簇中可能存在信道质量差异特别大的站点；1) In the selected multi-connection cluster, there may be sites with particularly large channel quality differences;
2)选出的多连接簇中虽然信道质量不错，但可能已经是非常拥塞或者将会是非常拥塞的站点；2) Although the channel quality in the selected multi-connection cluster is good, it may already be a very congested site or will be a very congested site;
综上，现有的无线资源的管理方法中仅依靠无线集中网元的信道强度来进行管理，其选择的无线资源可能不是较佳的无线资源(即可能是用户无法使用或接入的无线资源)，从而给用户带来不便，也给无线资源的管理带来问题。To sum up, the existing wireless resource management method only relies on the channel strength of the wireless centralized network element for management, and the selected wireless resource may not be a good wireless resource (that is, it may be a wireless resource that cannot be used or accessed by users). ), thereby causing inconvenience to users and problems in the management of radio resources.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于提供一种负载管理方法及无线集中网元，以解决现有技术中由于仅依靠信道强度来进行资源管理导致无法满足用户需求的问题。The purpose of the present invention is to provide a load management method and a wireless centralized network element, so as to solve the problem in the prior art that user requirements cannot be met due to only relying on channel strength for resource management.
为了达到上述目的，本发明实施例提供一种负载管理方法，应用于无线集中网元，包括：In order to achieve the above purpose, an embodiment of the present invention provides a load management method, which is applied to a wireless centralized network element, including:
获取一个或多个无线分布网元的负载信息；Obtain the load information of one or more wireless distribution network elements;
根据所述一个或多个无线分布网元的负载信息，进行负载管理或控制。Load management or control is performed according to the load information of the one or more wireless distribution network elements.
其中，所述方法还包括：Wherein, the method also includes:
获取一个或多个无线分布网元与终端的信道强度；Obtain the channel strength of one or more wireless distribution network elements and terminals;
根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇；所述多连接簇包含至少一个无线分布网元。According to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements, a multi-connection cluster is determined; the multi-connection cluster includes at least one wireless distribution network element.
其中，所述获取一个或多个无线分布网元与终端的信道强度的步骤，包括：Wherein, the step of acquiring the channel strength of one or more wireless distribution network elements and the terminal includes:
接收终端上报的无线资源控制RRC测量报告；其中，RRC测量报告中携带所述一个或多个无线分布网元与终端的信道强度。Receive a radio resource control RRC measurement report reported by the terminal; wherein, the RRC measurement report carries the channel strengths of the one or more radio distribution network elements and the terminal.
其中，所述无线分布网元的负载信息包括：所述无线分布网元的实时负载信息和/或所述无线分布网元的预测负载信息。The load information of the wireless distribution network element includes: real-time load information of the wireless distribution network element and/or predicted load information of the wireless distribution network element.
其中，获取一个或多个无线分布网元的负载信息的步骤，包括：Wherein, the step of acquiring the load information of one or more wireless distribution network elements includes:
接收一个或多个无线分布网元上报的所述无线分布网元的负载信息。Receive load information of the wireless distribution network element reported by one or more wireless distribution network elements.
其中，获取一个或多个无线分布网元的负载信息的步骤，包括：Wherein, the step of acquiring the load information of one or more wireless distribution network elements includes:
向所述一个或多个无线分布网元发送负载请求信息；sending load request information to the one or more wireless distribution network elements;
接收所述无线分布网元发送的所述无线分布网元的负载信息。The load information of the wireless distribution network element sent by the wireless distribution network element is received.
其中，所述根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇的步骤，包括：Wherein, the step of determining the multi-connection cluster according to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements includes:
根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集；所述候选集包含一个或多个无线分布网元；Determine the candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal; the candidate set includes one or more wireless distribution network elements;
根据所述候选集包含的一个或多个无线分布网元的负载信息，确定所述多连接簇。The multi-connection cluster is determined according to the load information of one or more wireless distribution network elements included in the candidate set.
其中，所述根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集的步骤，包括：Wherein, the step of determining the candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal includes:
将所述一个或多个无线分布网元与终端的信道强度分别与一预设门限值进行比较，确定多连接簇的候选集；其中，所述候选集包含的无线分布网元与终端的信道强度大于或者等于所述预设门限值。The channel strengths of the one or more wireless distribution network elements and the terminal are compared with a preset threshold value, respectively, to determine a candidate set of the multi-connection cluster; wherein, the wireless distribution network element and the terminal included in the candidate set are The channel strength is greater than or equal to the preset threshold value.
其中，获取一个或多个无线分布网元与终端的信道强度的步骤，包括：Wherein, the step of acquiring the channel strength of one or more wireless distribution network elements and the terminal includes:
向所述候选集包含的一个或多个无线分布网元发送负载请求信息；sending load request information to one or more wireless distribution network elements included in the candidate set;
接收所述候选集包含的一个或多个无线分布网元发送的所述无线分布网元与终端的负载信息。The load information of the wireless distribution network element and the terminal sent by one or more wireless distribution network elements included in the candidate set is received.
本发明实施例还提供一种无线集中网元，包括处理器和收发器，所述收发器用于执行如下过程：An embodiment of the present invention further provides a wireless centralized network element, including a processor and a transceiver, where the transceiver is configured to perform the following processes:
获取一个或多个无线分布网元的负载信息；Obtain the load information of one or more wireless distribution network elements;
所述处理器用于执行如下过程：The processor is configured to perform the following processes:
根据所述一个或多个无线分布网元的负载信息，进行负载管理或控制。Load management or control is performed according to the load information of the one or more wireless distribution network elements.
其中，所述收发器还用于：获取一个或多个无线分布网元与终端的信道强度；Wherein, the transceiver is further used for: acquiring the channel strength of one or more wireless distribution network elements and terminals;
所述处理器还用于：The processor is also used to:
根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇；所述多连接簇包含至少一个无线分布网元。According to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements, a multi-connection cluster is determined; the multi-connection cluster includes at least one wireless distribution network element.
其中，所述收发器还用于：Wherein, the transceiver is also used for:
接收终端上报的无线资源控制RRC测量报告；其中，RRC测量报告中携带所述一个或多个无线分布网元与终端的信道强度。Receive a radio resource control RRC measurement report reported by the terminal; wherein, the RRC measurement report carries the channel strengths of the one or more radio distribution network elements and the terminal.
其中，所述无线分布网元的负载信息包括：所述无线分布网元的实时负载信息和/或所述无线分布网元的预测负载信息。The load information of the wireless distribution network element includes: real-time load information of the wireless distribution network element and/or predicted load information of the wireless distribution network element.
其中，所述收发器还用于：Wherein, the transceiver is also used for:
接收一个或多个无线分布网元自主上报的所述无线分布网元的负载信息。Receive the load information of the wireless distribution network element autonomously reported by one or more wireless distribution network elements.
其中，所述收发器还用于：Wherein, the transceiver is also used for:
向所述一个或多个无线分布网元发送负载请求信息；sending load request information to the one or more wireless distribution network elements;
接收所述无线分布网元发送的所述无线分布网元的负载信息。The load information of the wireless distribution network element sent by the wireless distribution network element is received.
其中，所述处理器还用于：Wherein, the processor is also used for:
根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集；所述候选集包含一个或多个无线分布网元；Determine the candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal; the candidate set includes one or more wireless distribution network elements;
根据所述候选集包含的一个或多个无线分布网元的负载信息，确定所述多连接簇。The multi-connection cluster is determined according to the load information of one or more wireless distribution network elements included in the candidate set.
其中，所述处理器还用于：Wherein, the processor is also used for:
将所述一个或多个无线分布网元与终端的信道强度分别与一预设门限值进行比较，确定多连接簇的候选集；其中，所述候选集包含的无线分布网元与终端的信道强度大于或者等于所述预设门限值。The channel strengths of the one or more wireless distribution network elements and the terminal are compared with a preset threshold value, respectively, to determine a candidate set of the multi-connection cluster; wherein, the wireless distribution network element and the terminal included in the candidate set are The channel strength is greater than or equal to the preset threshold value.
其中，所述收发器还用于：Wherein, the transceiver is also used for:
向所述候选集包含的一个或多个无线分布网元发送负载请求信息；sending load request information to one or more wireless distribution network elements included in the candidate set;
接收所述候选集包含的一个或多个无线分布网元发送的所述无线分布网元与终端的负载信息。The load information of the wireless distribution network element and the terminal sent by one or more wireless distribution network elements included in the candidate set is received.
本发明实施例还提供一种无线集中网元，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述程序时实现如上所述的负载管理方法。An embodiment of the present invention further provides a wireless centralized network element, including a memory, a processor, and a computer program stored on the memory and running on the processor, where the processor implements the above when executing the program The load management method described above.
本发明实施例还提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现如上所述的负载管理方法中的步骤。Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, implements the steps in the load management method as described above.
本发明的上述技术方案至少具有如下有益效果：The above-mentioned technical scheme of the present invention has at least the following beneficial effects:
本发明实施例的上述技术方案中，无线集中网元依据一个或多个无线分布网元的负载信息来进行负载管理或控制，能够避免选择负载率较高的无线分布网元，提升无线资源管理的性能；从而使得用户能够接入资源有空闲的无线集中网元，提高了频谱利用率，最终能够提高系统吞吐量。In the above technical solutions of the embodiments of the present invention, the wireless centralized network element performs load management or control according to the load information of one or more wireless distribution network elements, which can avoid selecting a wireless distribution network element with a higher load rate and improve wireless resource management. Therefore, users can access the wireless centralized network elements with idle resources, improve the spectrum utilization rate, and finally improve the system throughput.
附图说明Description of drawings
图1表示本发明实施例提供的负载管理方法的步骤流程图；FIG. 1 shows a flowchart of steps of a load management method provided by an embodiment of the present invention;
图2表示本发明实施例提供的负载管理方法应用于CU-DU架构下的交互流程图；FIG. 2 shows an interaction flowchart in which the load management method provided by the embodiment of the present invention is applied to the CU-DU architecture;
图3表示本发明实施例提供的负载管理方法应用于双连接架构下的交互流程图；FIG. 3 shows an interaction flow diagram of applying the load management method provided by an embodiment of the present invention to a dual-connection architecture;
图4表示本发明实施例提供的无线集中网元的结构示意图；FIG. 4 is a schematic structural diagram of a wireless centralized network element provided by an embodiment of the present invention;
图5表示本发明实施例提供的负载管理装置的结构示意图。FIG. 5 is a schematic structural diagram of a load management apparatus provided by an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明要解决的技术问题、技术方案和优点更加清楚，下面将结合附图及具体实施例进行详细描述。In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments.
如图1所示，本发明实施例提供一种负载管理方法，应用于无线集中网元，包括：As shown in FIG. 1, an embodiment of the present invention provides a load management method, which is applied to a wireless centralized network element, including:
步骤11，获取一个或多个无线分布网元的负载信息。Step 11: Acquire load information of one or more wireless distribution network elements.
本步骤中，第二连接无线集中网元具体为小区、基站、无线接入点AP等，在此不作具体限定。In this step, the second connected wireless centralized network element is specifically a cell, a base station, a wireless access point AP, etc., which is not specifically limited here.
步骤12，根据所述一个或多个无线分布网元的负载信息，进行负载管理或控制。Step 12: Perform load management or control according to the load information of the one or more wireless distribution network elements.
较佳的，本步骤中，所述无线分布网元的负载信息包括：所述无线分布网元的实时负载信息和/或所述无线分布网元的预测负载信息。Preferably, in this step, the load information of the wireless distribution network element includes: real-time load information of the wireless distribution network element and/or predicted load information of the wireless distribution network element.
本步骤中，在进行负载管理或控制过程中参考无线分布网元的实时负载信息能够避免选择当前负载率特别高的无线分布网元；而在进行负载管理或控制过程中参考无线分布网元的预测负载信息能够避免选择未来短时间内负载率特别高的无线分布网元。In this step, referring to the real-time load information of the wireless distribution network element during the load management or control process can avoid selecting the wireless distribution network element with a particularly high current load rate; and referring to the wireless distribution network element during the load management or control process The predicted load information can avoid selecting wireless distribution network elements with a particularly high load rate in a short period of time in the future.
进一步的，本发明的上述实施例中，该负载管理方法还包括：Further, in the above-mentioned embodiment of the present invention, the load management method further includes:
步骤13，获取一个或多个无线分布网元与终端的信道强度。Step 13: Acquire channel strengths of one or more wireless distribution network elements and terminals.
本步骤中，无线分布网元的信道强度可以通过参考信号接收功率RSRP值或者参考信号接收质量RSRQ值来指示，也可以通过其他参考值来指示信道强度，在此不作具体限定。In this step, the channel strength of the wireless distribution network element may be indicated by the RSRP value of the reference signal received power or the RSRQ value of the reference signal received quality, or may be indicated by other reference values, which are not specifically limited here.
相应的，步骤12包括：Correspondingly, step 12 includes:
步骤121，根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇；所述多连接簇包含至少一个无线分布网元。Step 121: Determine a multi-connection cluster according to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements; the multi-connection cluster includes at least one wireless distribution network element.
具体的，在进行负载管理或控制过程中参考无线分布网元的信道强度能够避免选择信道强度较差的无线分布网元；换言之，其能够剔除掉链路极差的无线分布网元；而在进行负载管理或控制过程中参考无线分布网元的负载信息能够避免选择负载率特别高的无线分布网元。Specifically, referring to the channel strength of the wireless distribution network elements in the process of load management or control can avoid selecting wireless distribution network elements with poor channel strength; in other words, it can eliminate wireless distribution network elements with extremely poor links; In the process of load management or control, referring to the load information of the wireless distribution network element can avoid selecting a wireless distribution network element with a particularly high load rate.
同理，在确定多连接簇的过程中参考无线分布网元的信道强度能够避免选择信道强度较差的无线分布网元；换言之，其能够初步剔除掉链路极差的无线分布网元。Similarly, referring to the channel strength of wireless distribution network elements in the process of determining multi-connection clusters can avoid selecting wireless distribution network elements with poor channel strength; in other words, it can preliminarily eliminate wireless distribution network elements with extremely poor links.
在确定多连接簇的过程中参考无线分布网元的实时负载信息能够避免选择当前负载率特别高的无线分布网元；而在确定多连接簇的过程中参考无线分布网元的预测负载信息能够避免选择未来短时间内负载率特别高的无线分布网元。In the process of determining the multi-connection cluster, referring to the real-time load information of the wireless distribution network element can avoid selecting the wireless distribution network element with a particularly high current load rate; while in the process of determining the multi-connection cluster, referring to the predicted load information of the wireless distribution network element can Avoid selecting wireless distribution network elements with a particularly high load rate in a short period of time in the future.
需要说明的是，对于无线分布网元的预测负载信息，可以选用用户密度作为预测负载的一种方式。由于用户密度代表当前用户所在基站的用户密集程度，在反映当前基站资源变化的同时，一定程度上可以预测未来网络负荷的变化，当小区网络负荷高时，应该减少用户协作基站个数，以降低资源块的竞争程度，反之，则增加用户协作基站个数，以提高频谱利用效率。因此通过考虑用户密度作为决定协作基站的因素来达到自适应地动态调整门限的目的。It should be noted that, for the predicted load information of the wireless distribution network element, the user density can be selected as a way of predicting the load. Since the user density represents the user density of the base station where the current user is located, while reflecting the change of the current base station resources, the future network load change can be predicted to a certain extent. When the cell network load is high, the number of user cooperative base stations should be reduced to reduce The competition degree of resource blocks, on the contrary, increase the number of user cooperative base stations to improve spectrum utilization efficiency. Therefore, the purpose of adaptively and dynamically adjusting the threshold is achieved by considering the user density as a factor for determining the cooperative base station.
综上，本发明的上述实施例在选择多连接簇的时候不仅考虑第二的无线集中网元的信道强度，还考虑第二的无线集中网元的负载信息，不仅能够避免选择信道强度较差的无线集中网元，还能够避免选择负载率较高的无线集中网元，提升多连接的性能，从而使得用户能够接入资源有空闲的无线集中网元，提高了频谱利用率，最终能够提高系统吞吐量。To sum up, the above embodiments of the present invention not only consider the channel strength of the second wireless centralized network element, but also the load information of the second wireless centralized network element when selecting a multi-connection cluster, which can not only avoid the selection of poor channel strength It can also avoid the selection of wireless centralized network elements with a higher load rate, improve the performance of multi-connection, so that users can access wireless centralized network elements with idle resources, improve spectrum utilization, and ultimately improve system throughput.
进一步的，本发明的上述实施例中步骤13包括：Further, step 13 in the above-mentioned embodiment of the present invention includes:
接收终端上报的无线资源控制RRC测量报告；其中，RRC测量报告中携带所述一个或多个无线分布网元与终端的信道强度。Receive a radio resource control RRC measurement report reported by the terminal; wherein, the RRC measurement report carries the channel strengths of the one or more radio distribution network elements and the terminal.
进一步的，本发明的上述实施例中步骤11包括：Further, step 11 in the above-mentioned embodiment of the present invention includes:
通过F1接口、X2接口或者Xn接口获取一个或多个无线分布网元的负载信息。The load information of one or more wireless distribution network elements is acquired through the F1 interface, the X2 interface or the Xn interface.
需要说明的是，在CU(集中单元)-DU(分布单元)架构下时，集中单元CU为无线集中网元，分布单元DU为无线分布网元，则分布单元DU通过F1接口告知集中单元CU关于分布单元DU的负载信息。It should be noted that under the CU (centralized unit)-DU (distributed unit) architecture, the centralized unit CU is a wireless centralized network element, and the distribution unit DU is a wireless distributed network element, and the distribution unit DU informs the centralized unit CU through the F1 interface. Load information about the distribution unit DU.
而在双连接架构下时，主节点MN为无线集中网元，辅节点SN为无线分布网元，则辅节点SN通过X2接口或者Xn接口告知主节点MN关于辅节点SN的负载信息。In the dual-connection architecture, the master node MN is a wireless centralized network element, and the slave node SN is a wireless distribution network element. The slave node SN informs the master node MN about the load information of the slave node SN through the X2 interface or the Xn interface.
较佳的，本发明的上述实施例中，步骤11具体包括：Preferably, in the above embodiment of the present invention, step 11 specifically includes:
接收一个或多个无线分布网元上报的所述无线分布网元的负载信息。Receive load information of the wireless distribution network element reported by one or more wireless distribution network elements.
或者，or,
向所述一个或多个无线分布网元发送负载请求信息；接收所述无线分布网元发送的所述无线分布网元的负载信息。Send load request information to the one or more wireless distribution network elements; and receive load information of the wireless distribution network element sent by the wireless distribution network element.
进一步的，无线分布网元自主上报负载信息时可以是周期上报的，也可以是非周期上报的，在此不作具体限定。而基于无线集中网元发送的负载请求信息上报负载信息时能够节约无线分布网元的传输资源，因为无线分布网元仅在无线集中网元需要的时刻才上报负载信息。Further, when the wireless distribution network element autonomously reports the load information, it may be reported periodically or aperiodically, which is not specifically limited here. However, when the load information is reported based on the load request information sent by the wireless centralized network element, the transmission resources of the wireless distribution network element can be saved, because the wireless distribution network element reports the load information only when the wireless centralized network element needs it.
进一步的，本发明的上述实施例中根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇的步骤，包括：Further, in the above-mentioned embodiment of the present invention, the step of determining the multi-connection cluster according to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements includes:
根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集；所述候选集包含一个或多个无线分布网元；Determine the candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal; the candidate set includes one or more wireless distribution network elements;
根据所述候选集包含的一个或多个无线分布网元的负载信息，确定所述多连接簇。The multi-connection cluster is determined according to the load information of one or more wireless distribution network elements included in the candidate set.
具体的，根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集的步骤，包括：Specifically, the step of determining the candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal includes:
将所述一个或多个无线分布网元与终端的信道强度分别与一预设门限值进行比较，确定多连接簇的候选集；其中，所述候选集包含的无线分布网元与终端的信道强度大于或者等于所述预设门限值。The channel strengths of the one or more wireless distribution network elements and the terminal are compared with a preset threshold value, respectively, to determine a candidate set of the multi-connection cluster; wherein, the wireless distribution network element and the terminal included in the candidate set are The channel strength is greater than or equal to the preset threshold value.
本步骤中，预设门限值的选择可以基于信道强度最好的无线集中网元的信道强度来确定，在此不作具体限定。In this step, the selection of the preset threshold value may be determined based on the channel strength of the wireless centralized network element with the best channel strength, which is not specifically limited here.
进一步的，本发明的上述实施例中获取负载信息的步骤可以位于确定候选集之后，即相应的步骤11包括：Further, the step of acquiring the load information in the above-mentioned embodiment of the present invention may be located after the candidate set is determined, that is, the corresponding step 11 includes:
向所述候选集包含的一个或多个无线分布网元发送负载请求信息；sending load request information to one or more wireless distribution network elements included in the candidate set;
接收所述候选集包含的一个或多个无线分布网元发送的所述无线分布网元与终端的负载信息。The load information of the wireless distribution network element and the terminal sent by one or more wireless distribution network elements included in the candidate set is received.
此种方式下，仅向候选集中的无线分布网元发送负载请求信息，节省信令开销。例如，无线分布网元包括：无线收发点1、无线收发点2、无线收发点3以及无线收发点4。其中无线收发点1-3的信道强度大于预设门限值，而无线收发点4的信道强度小于预设门限值；故多连接簇的候选集包括：无线收发点1、无线收发点2以及无线收发点3。此时向无线收发点1、无线收发点2以及无线收发点3发送负载请求信息，则无线收发点1、无线收发点2以及无线收发点3接收到负载请求信息之后发送其各自负载信息。此种方式下，无线收发点4无需上报其负载信息，节省了无线收发点4的传输资源，提高频谱利用率。In this way, the load request information is only sent to the wireless distribution network elements in the candidate set, which saves signaling overhead. For example, the wireless distribution network element includes: wireless transceiver point 1 , wireless transceiver point 2 , wireless transceiver point 3 , and wireless transceiver point 4 . The channel strength of wireless transceiver points 1-3 is greater than the preset threshold value, while the channel strength of wireless transceiver point 4 is smaller than the preset threshold value; therefore, the candidate set of the multi-connection cluster includes: wireless transceiver point 1, wireless transceiver point 2 And wireless transceiver point 3. At this time, load request information is sent to wireless transceiver point 1, wireless transceiver point 2, and wireless transceiver point 3, then wireless transceiver point 1, wireless transceiver point 2, and wireless transceiver point 3 send their respective load information after receiving the load request information. In this way, the wireless transceiver point 4 does not need to report its load information, which saves the transmission resources of the wireless transceiver point 4 and improves the spectrum utilization rate.
为了更详细的描述本申请提供的负载管理方法，下面分别结合两种具体的应用场景来进行描述：In order to describe the load management method provided by this application in more detail, two specific application scenarios are described below:
如图2所示，在集中单元CU-分布单元DU架构下，负载管理方法流程如下：As shown in Figure 2, under the centralized unit CU-distributed unit DU architecture, the flow of the load management method is as follows:
终端通过RRC测量报告上报多个DU的信道强度，CU基于预设门限值确定多连接簇的候选集DU1-DUn；CU通过F1接口向候选集DU1-DUn发送负载请求信息，候选集DU1-DUn通过F1接口返回各自的负载信息；CU根据候选集DU1-DUn的负载信息确定多连接簇DU1-DUm；后续终端与CU确定的多连接簇DU1-Dum建立连接。需要说明的是，多个DU也可以通过F1接口周期性上报其各自的负载信息。The terminal reports the channel strengths of multiple DUs through the RRC measurement report, and the CU determines the candidate set DU1-DUn of the multi-connection cluster based on the preset threshold value; the CU sends the load request information to the candidate set DU1-DUn through the F1 interface, and the candidate set DU1-DUn The DUn returns the respective load information through the F1 interface; the CU determines the multi-connection cluster DU1-DUm according to the load information of the candidate set DU1-DUn; the subsequent terminal establishes a connection with the multi-connection cluster DU1-Dum determined by the CU. It should be noted that, multiple DUs can also periodically report their respective load information through the F1 interface.
如图3所示，对于双连接架构下，负载管理方法流程如下：As shown in Figure 3, for the dual-connection architecture, the flow of the load management method is as follows:
终端通过RRC测量报告上报多个SN的信道强度，MN基于预设门限值确定多连接簇的候选集SN1-SNn；MN通过X2/Xn接口向候选集SN1-SNn发送负载请求信息，候选集SN1-SNn通过X2/Xn接口返回各自的负载信息；MN根据候选集SN1-SNn的负载信息确定多连接簇SN1-SNm；后续终端与MN确定的多连接簇SN1-SNm建立连接。需要说明的是，多个SN也可以通过X2/Xn接口周期性上报其各自的负载信息。The terminal reports the channel strengths of multiple SNs through the RRC measurement report, and the MN determines the candidate sets SN1-SNn of the multi-connection cluster based on the preset threshold value; the MN sends the load request information to the candidate sets SN1-SNn through the X2/Xn interface. SN1-SNn return their respective load information through the X2/Xn interface; MN determines the multi-connection cluster SN1-SNm according to the load information of the candidate set SN1-SNn; the subsequent terminal establishes a connection with the multi-connection cluster SN1-SNm determined by the MN. It should be noted that, multiple SNs can also periodically report their respective load information through the X2/Xn interface.
综上，本发明的上述实施例中，无线集中网元依据一个或多个无线分布网元的负载信息来进行负载管理或控制，能够避免选择负载率较高的无线分布网元，提升无线资源管理的性能；具体的，在选择多连接簇的时候不仅考虑无线分布网元的信道强度，还考虑无线分布网元的负载信息，不仅能够避免选择信道强度较差的无线分布网元，还能够避免选择负载率较高的无线分布网元，提升多连接的性能，从而使得用户能够接入资源有空闲的无线分布网元，提高了频谱利用率，最终能够提高系统吞吐量。To sum up, in the above embodiments of the present invention, the wireless centralized network element performs load management or control according to the load information of one or more wireless distribution network elements, which can avoid selecting a wireless distribution network element with a higher load rate and improve wireless resources. Management performance; specifically, when selecting a multi-connection cluster, not only the channel strength of the wireless distribution network element, but also the load information of the wireless distribution network element is considered, which can not only avoid selecting the wireless distribution network element with poor channel strength, but also can Avoid selecting wireless distribution network elements with a high load rate to improve multi-connection performance, so that users can access wireless distribution network elements with idle resources, improve spectrum utilization, and ultimately improve system throughput.
如图4所示，本发明实施例还提供一种无线集中网元，包括处理器400和收发器410，所述收发器410用于执行如下过程：As shown in FIG. 4 , an embodiment of the present invention further provides a wireless centralized network element, including a processor 400 and a transceiver 410, where the transceiver 410 is configured to perform the following processes:
获取一个或多个无线分布网元的负载信息；Obtain the load information of one or more wireless distribution network elements;
所述处理器400用于执行如下过程：The processor 400 is configured to perform the following processes:
根据所述一个或多个无线分布网元的负载信息，进行负载管理或控制。Load management or control is performed according to the load information of the one or more wireless distribution network elements.
需要说明的是，本发明实施例提供的无线集中网元具体指上述资管理方法中的无线集中网元，更具体的，该无线集中网元具体指CU-DU架构下的集中单元CU，或者双连接架构下的主节点MN。相应的，无线分布网元具体指CU-DU架构下的分布单元DU，或者双连接架构下的辅节点SN。It should be noted that the wireless centralized network element provided in the embodiment of the present invention specifically refers to the wireless centralized network element in the above-mentioned asset management method. More specifically, the wireless centralized network element specifically refers to the centralized unit CU under the CU-DU architecture, or The master node MN under the dual-connection architecture. Correspondingly, the wireless distribution network element specifically refers to the distribution unit DU under the CU-DU architecture, or the secondary node SN under the dual connectivity architecture.
较佳的，本发明的上述实施例中，所述收发器410还用于：获取一个或多个无线分布网元与终端的信道强度；Preferably, in the above embodiment of the present invention, the transceiver 410 is further configured to: acquire the channel strength of one or more wireless distribution network elements and terminals;
所述处理器400还用于：The processor 400 is also used for:
根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇；所述多连接簇包含至少一个无线分布网元。According to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements, a multi-connection cluster is determined; the multi-connection cluster includes at least one wireless distribution network element.
较佳的，本发明的上述实施例中，所述收发器410还用于：Preferably, in the above embodiment of the present invention, the transceiver 410 is further used for:
接收终端上报的无线资源控制RRC测量报告；其中，RRC测量报告中携带所述一个或多个无线分布网元与终端的信道强度。Receive a radio resource control RRC measurement report reported by the terminal; wherein, the RRC measurement report carries the channel strengths of the one or more radio distribution network elements and the terminal.
较佳的，本发明的上述实施例中，所述收发器410还用于：Preferably, in the above embodiment of the present invention, the transceiver 410 is further used for:
通过F1接口、X2接口或者Xn接口获取一个或多个无线分布网元的负载信息。The load information of one or more wireless distribution network elements is acquired through the F1 interface, the X2 interface or the Xn interface.
较佳的，本发明的上述实施例中，所述无线分布网元的负载信息包括：所述无线分布网元的实时负载信息和/或所述无线分布网元的预测负载信息。Preferably, in the above embodiment of the present invention, the load information of the wireless distribution network element includes: real-time load information of the wireless distribution network element and/or predicted load information of the wireless distribution network element.
较佳的，本发明的上述实施例中，所述收发器410还用于：Preferably, in the above embodiment of the present invention, the transceiver 410 is further used for:
接收一个或多个无线分布网元自主上报的所述无线分布网元的负载信息。Receive the load information of the wireless distribution network element autonomously reported by one or more wireless distribution network elements.
较佳的，本发明的上述实施例中，所述收发器410还用于：Preferably, in the above embodiment of the present invention, the transceiver 410 is further used for:
向所述一个或多个无线分布网元发送负载请求信息；sending load request information to the one or more wireless distribution network elements;
接收所述无线分布网元发送的所述无线分布网元的负载信息。The load information of the wireless distribution network element sent by the wireless distribution network element is received.
较佳的，本发明的上述实施例中，所述处理器400还用于：Preferably, in the above-mentioned embodiment of the present invention, the processor 400 is further configured to:
根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集；所述候选集包含一个或多个无线分布网元；Determine the candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal; the candidate set includes one or more wireless distribution network elements;
根据所述候选集包含的一个或多个无线分布网元的负载信息，确定所述多连接簇。The multi-connection cluster is determined according to the load information of one or more wireless distribution network elements included in the candidate set.
较佳的，本发明的上述实施例中，所述处理器400还用于：Preferably, in the above-mentioned embodiment of the present invention, the processor 400 is further configured to:
将所述一个或多个无线分布网元与终端的信道强度分别与一预设门限值进行比较，确定多连接簇的候选集；其中，所述候选集包含的无线分布网元与终端的信道强度大于或者等于所述预设门限值。The channel strengths of the one or more wireless distribution network elements and the terminal are compared with a preset threshold value, respectively, to determine a candidate set of the multi-connection cluster; wherein, the wireless distribution network element and the terminal included in the candidate set are The channel strength is greater than or equal to the preset threshold value.
较佳的，本发明的上述实施例中，所述收发器410还用于：Preferably, in the above embodiment of the present invention, the transceiver 410 is further used for:
向所述候选集包含的一个或多个无线分布网元发送负载请求信息；sending load request information to one or more wireless distribution network elements included in the candidate set;
接收所述候选集包含的一个或多个无线分布网元发送的所述无线分布网元与终端的负载信息。The load information of the wireless distribution network element and the terminal sent by one or more wireless distribution network elements included in the candidate set is received.
综上，本发明的上述实施例中，无线集中网元依据一个或多个无线分布网元的负载信息来进行负载管理或控制，能够避免选择负载率较高的无线分布网元，提升无线资源管理的性能；具体的，在选择多连接簇的时候不仅考虑无线分布网元的信道强度，还考虑无线分布网元的负载信息，不仅能够避免选择信道强度较差的无线分布网元，还能够避免选择负载率较高的无线分布网元，提升多连接的性能，从而使得用户能够接入资源有空闲的无线分布网元，提高了频谱利用率，最终能够提高系统吞吐量。To sum up, in the above embodiments of the present invention, the wireless centralized network element performs load management or control according to the load information of one or more wireless distribution network elements, which can avoid selecting a wireless distribution network element with a higher load rate and improve wireless resources. Management performance; specifically, when selecting a multi-connection cluster, not only the channel strength of the wireless distribution network element, but also the load information of the wireless distribution network element is considered, which can not only avoid selecting the wireless distribution network element with poor channel strength, but also can Avoid selecting wireless distribution network elements with a high load rate to improve multi-connection performance, so that users can access wireless distribution network elements with idle resources, improve spectrum utilization, and ultimately improve system throughput.
需要说明的是，本发明的上述实施例提供的无线集中网元是能够执行上述负载管理方法的无线集中网元，故上述负载管理方法的所有实施例均适用于该无线集中网元，且均能达到相同或相似的有益效果。It should be noted that the wireless centralized network element provided by the above-mentioned embodiments of the present invention is a wireless centralized network element capable of executing the above-mentioned load management method, so all embodiments of the above-mentioned load management method are applicable to the wireless centralized network element, and all can achieve the same or similar beneficial effects.
如图5所示，本发明实施例还提供一种负载管理装置，应用于无线集中网元，包括：As shown in FIG. 5 , an embodiment of the present invention further provides a load management device, which is applied to a wireless centralized network element, including:
第一获取模块501，用于获取一个或多个无线分布网元的负载信息；The first obtaining module 501 is configured to obtain load information of one or more wireless distribution network elements;
管理模块502，用于根据所述一个或多个无线分布网元的负载信息，进行负载管理或控制。The management module 502 is configured to perform load management or control according to the load information of the one or more wireless distribution network elements.
较佳的，本发明的上述实施例中所述装置还包括：Preferably, the device in the above-mentioned embodiment of the present invention further includes:
第二获取模块，用于获取一个或多个无线分布网元与终端的信道强度；The second acquisition module is used to acquire the channel strength of one or more wireless distribution network elements and terminals;
所述管理模块包括：The management module includes:
管理子模块，用于根据所述一个或多个无线分布网元与终端的信道强度以及一个或多个无线分布网元的负载信息，确定多连接簇；所述多连接簇包含至少一个无线分布网元。A management submodule, configured to determine a multi-connection cluster according to the channel strength of the one or more wireless distribution network elements and the terminal and the load information of the one or more wireless distribution network elements; the multi-connection cluster includes at least one wireless distribution network network element.
较佳的，本发明的上述实施例中所述第二获取模块包括：Preferably, the second acquisition module in the above-mentioned embodiment of the present invention includes:
第一获取子模块，用于接收终端上报的无线资源控制RRC测量报告；其中，RRC测量报告中携带所述一个或多个无线分布网元与终端的信道强度。The first acquisition sub-module is configured to receive the radio resource control RRC measurement report reported by the terminal; wherein, the RRC measurement report carries the channel strengths of the one or more radio distribution network elements and the terminal.
较佳的，本发明的上述实施例中，所述无线分布网元的负载信息包括：所述无线分布网元的实时负载信息和/或所述无线分布网元的预测负载信息。Preferably, in the above embodiment of the present invention, the load information of the wireless distribution network element includes: real-time load information of the wireless distribution network element and/or predicted load information of the wireless distribution network element.
较佳的，本发明的上述实施例中，所述第一获取模块包括：Preferably, in the above-mentioned embodiment of the present invention, the first acquisition module includes:
第二获取子模块，用于接收一个或多个无线分布网元上报的所述无线分布网元的负载信息。The second acquiring submodule is configured to receive the load information of the wireless distribution network element reported by one or more wireless distribution network elements.
较佳的，本发明的上述实施例中，所述第一获取模块包括：Preferably, in the above-mentioned embodiment of the present invention, the first acquisition module includes:
第一请求子模块，用于向所述一个或多个无线分布网元发送负载请求信息；a first request submodule, configured to send load request information to the one or more wireless distribution network elements;
第三获取子模块，用于接收所述无线分布网元发送的所述无线分布网元的负载信息。The third obtaining sub-module is configured to receive the load information of the wireless distribution network element sent by the wireless distribution network element.
较佳的，本发明的上述实施例中所述管理子模块包括：Preferably, the management sub-module in the above-mentioned embodiment of the present invention includes:
第一管理单元，用于根据一个或多个无线分布网元与终端的信道强度，确定多连接簇的候选集；所述候选集包含一个或多个无线分布网元；a first management unit, configured to determine a candidate set of the multi-connection cluster according to the channel strength of one or more wireless distribution network elements and the terminal; the candidate set includes one or more wireless distribution network elements;
第二管理单元，用于根据所述候选集包含的一个或多个无线分布网元的负载信息，确定所述多连接簇。The second management unit is configured to determine the multi-connection cluster according to the load information of one or more wireless distribution network elements included in the candidate set.
较佳的，本发明的上述实施例中所述第一管理单元进一步用于：Preferably, the first management unit described in the above embodiment of the present invention is further used for:
将所述一个或多个无线分布网元与终端的信道强度分别与一预设门限值进行比较，确定多连接簇的候选集；其中，所述候选集包含的无线分布网元与终端的信道强度大于或者等于所述预设门限值。The channel strengths of the one or more wireless distribution network elements and the terminal are compared with a preset threshold value, respectively, to determine a candidate set of the multi-connection cluster; wherein, the wireless distribution network element and the terminal included in the candidate set are The channel strength is greater than or equal to the preset threshold value.
较佳的，本发明的上述实施例中，所述第二获取模块进一步用于：Preferably, in the above-mentioned embodiment of the present invention, the second acquisition module is further used for:
向所述候选集包含的一个或多个无线分布网元发送负载请求信息；sending load request information to one or more wireless distribution network elements included in the candidate set;
接收所述候选集包含的一个或多个无线分布网元发送的所述无线分布网元与终端的负载信息。The load information of the wireless distribution network element and the terminal sent by one or more wireless distribution network elements included in the candidate set is received.
综上，本发明的上述实施例中，无线集中网元依据一个或多个无线分布网元的负载信息来进行负载管理或控制，能够避免选择负载率较高的无线分布网元，提升无线资源管理的性能；具体的，在选择多连接簇的时候不仅考虑无线分布网元的信道强度，还考虑无线分布网元的负载信息，不仅能够避免选择信道强度较差的无线分布网元，还能够避免选择负载率较高的无线分布网元，提升多连接的性能，从而使得用户能够接入资源有空闲的无线分布网元，提高了频谱利用率，最终能够提高系统吞吐量。To sum up, in the above embodiments of the present invention, the wireless centralized network element performs load management or control according to the load information of one or more wireless distribution network elements, which can avoid selecting a wireless distribution network element with a higher load rate and improve wireless resources. Management performance; specifically, when selecting a multi-connection cluster, not only the channel strength of the wireless distribution network element, but also the load information of the wireless distribution network element is considered, which can not only avoid selecting the wireless distribution network element with poor channel strength, but also can Avoid selecting wireless distribution network elements with a high load rate to improve multi-connection performance, so that users can access wireless distribution network elements with idle resources, improve spectrum utilization, and ultimately improve system throughput.
需要说明的是，本发明的上述实施例提供的无线集中网元是能够执行上述负载管理方法的无线集中网元，故上述负载管理方法的所有实施例均适用于该无线集中网元，且均能达到相同或相似的有益效果。It should be noted that the wireless centralized network element provided by the above-mentioned embodiments of the present invention is a wireless centralized network element capable of executing the above-mentioned load management method, so all embodiments of the above-mentioned load management method are applicable to the wireless centralized network element, and all can achieve the same or similar beneficial effects.
本发明实施例还提供一种无线集中网元，包括存储器、处理器及存储在所述存储器上并可在所述处理器上运行的计算机程序，所述处理器执行所述程序时实现如上所述的负载管理方法实施例中的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。An embodiment of the present invention further provides a wireless centralized network element, including a memory, a processor, and a computer program stored on the memory and running on the processor, where the processor implements the above when executing the program Each process in the load management method embodiment described above can achieve the same technical effect. To avoid repetition, details are not described here.
本发明实施例还提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时实现如上所述的负载管理方法实施例中的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。其中，所述的计算机可读存储介质，如只读存储器(Read-Only Memory，简称ROM)、随机存取存储器(Random Access Memory，简称RAM)、磁碟或者光盘等。Embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, each process in the foregoing load management method embodiment can be implemented, and the same technical effect can be achieved. , in order to avoid repetition, it will not be repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk, or an optical disk.
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可读存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。As will be appreciated by one skilled in the art, the embodiments of the present application may be provided as a method, a system or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.
本申请是参照根据本申请实施例的方法、设备(系统)和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其它可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其它可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或一个方框或多个方框中指定的功能的装置。The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow and/or a block or blocks of the flowchart.
这些计算机程序指令也可存储在能引导计算机或其它可编程数据处理设备以特定方式工作的计算机可读存储介质中，使得存储在该计算机可读存储介质中的指令产生包括指令装置的纸制品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。These computer program instructions may also be stored in a computer-readable storage medium capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce a paper product comprising the instruction means, The instruction means implements the functions specified in the flow or flows of the flowcharts and/or the block or blocks of the block diagrams.
这些计算机程序指令也可装载到计算机或其它可编程数据处理设备上，使得计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他科编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing the computer or other programmable device to perform a series of operational steps to produce a computer-implemented process, thereby causing the instructions to be executed on the computer or other programmable data processing device Steps are provided for implementing the functions specified in a flow or flows of the flowcharts and/or a block or blocks of the block diagrams.
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.
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