一种基于分布式功率控制的侧行链路高谱效传输机制  

A Spectrum-efficient Sidelink Transmission Scheme Based on Distributed Power Control

作　　者：何小祥[1] 王碧钗 HE Xiaoxiang;WANG Bichai(Huawei Technologies Co.,Ltd.,Shenzhen 518129,China)

机构地区：[1]华为技术有限公司,广东深圳518129

出　　处：《电讯技术》2024年第2期281-287,共7页Telecommunication Engineering

摘　　要：第五代(5th Generation,5G)无线通信系统除了支持蜂窝通信,还支持侧行链路(Sidelink,SL)通信,即两个用户设备(User Equipment,UE)之间可以直接通信,而不需要经过基站中转,有利于降低传输时延、提升资源利用率。在现有的SL分布式系统中,主要通过简单的能量测量进行干扰规避,资源复用准则欠佳,导致中高用户密度场景下吞吐受限。为此,提出了一种基于分布式功率控制的SL高谱效传输机制。各发送UE基于目标链路的信道状态信息(Channel State Information,CSI)和其他干扰链路的CSI进行功率优化,以实现局部范围内多个通信链路的和吞吐最大化;进一步,设计了广播式的CSI测量上报机制能实现多链路的分布式功率控制和资源选择。仿真结果表明,所提方案相比于现有的SL分布式资源分配机制,在中高用户密度下可获得30%~100%的吞吐增益;此外,所提方案相比于现有WiFi的载波侦听多址(Carrier Sense Multiple Access,CSMA)分布式信道接入机制,在中高用户密度下可获得50%~200%的吞吐增益。In addition to cellular communication,sidelink(SL)communication has been supported in the fifth generation(5G)wireless communication systems,where two user equipments(UE)may directly communicate with each other without passing through a base station.This can reduce the transmission delay and improve resource utilization.In existing SL distributed systems,interference avoidance is mainly performed based on energy measurement,which resulted in limited throughput in a medium-or high-user density scenario.To address this problem,a spectrum-efficient SL transmission scheme based on distributed power control is proposed.Power control based on channel state information(CSI)from the target link and CSI from other interfering links is performed at each transmitting UE,so as to maximize sum throughput of a plurality of communication links in a local range.Furthermore,a broadcast CSI measurement and reporting mechanism is designed to enable distributed power control and resource selection.Simulation results show that compared with the existing SL distributed resource selection scheme,the proposed scheme can achieve 30%~100%throughput gain under medium or high user density.In addition,compared with the existing WiFi carrier sense multiple access(CSMA)scheme,the proposed solution can achieve a throughput gain of 50%to 200%under medium or high user densities.

关 键 词：侧行链路通信 分布式功率控制 资源选择 

分 类 号：TN911[电子电信—通信与信息系统]