一种5G系统NSA模式下的PDCP分流技术  

PDCP Shunting Technology in NSA Mode of 5G System

作　　者：齐勇 张晓华 李鹏鹏 QI Yong;ZHANG Xiaohua;LI Pengpeng(Chongqing Communication Design Institute Co.,Ltd.,Chongqing 400041,China)

机构地区：[1]重庆市信息通信咨询设计院有限公司,重庆400041

出　　处：《无线电工程》2022年第3期423-428,共6页Radio Engineering

基　　金：重庆市重大主题专项(cstc2019jscx-zdztzxX0002)。

摘　　要：5G NSA模式下,用户数据可在分组数据汇聚协议(Packet Data Convergence Protocol,PDCP)层分流后进行双链路传输,由于各链路特性不同且动态变化,接收端存在乱序现象,导致重传、接收缓冲区阻塞。针对以上问题,提出了一种适用于双连接架构,可实现PDCP层数据聚合乱序程度最小、系统速率最大的分流方法。建立双连接触发机制,确定分流界限;基于链路传输能力和缓存队列确定分流比例,通过时延补偿控制数据发送顺序。仿真结果表明,该算法较合适分流比例算法吞吐率提升30 Mb/s,重排序丢包率降低35%;较OMS算法吞吐量提高40 Mb/s,重排序丢包率降低50%。Under the 5G NSA networking architecture,user data can be transmitted through dual links after being shunted at the PDCP layer.However,considering the different and dynamic characteristics of each link,the receiving end is out of order,which leads to retransmission and receiving buffer blocking.A data shunting scheme that is suitable for dual-connection architecture and can minimize the data aggregation disorder of the PDCP layer and maximize the system rate is proposed.Firstly,a dual-connection trigger mechanism is established to determine the PDCP offloading limit;Secondly,the offloading ratio is determined based on the link transmission capacity and cache queue and the delay compensation is used to control the data packet transmission sequence.Simulation results show that the proposed algorithm can improve the throughput rate by 30 Mb/s and reduce the reordering packet loss rate by 35%compared with the proper split ratio algorithm.Compared with the OMS algorithm,it improves the throughput by 40 Mb/s and reduces the reordering packet loss rate by 50%.

关 键 词：NSA 双连接 分组数据汇聚协议 数据分流 

分 类 号：TN929.5[电子电信—通信与信息系统]