一种基于链路质量的选择协作式HARQ传输协议  

A selective cooperative HARQ protocol based on link quality

作　　者：戴翠琴[1] 任薇[1] 蒋丽[1] 

机构地区：[1]重庆邮电大学移动通信技术重点实验室,重庆400065

出　　处：《重庆邮电大学学报（自然科学版）》2011年第3期258-261,293,共5页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(60972070);重庆市自然科学基金重点项目(CSTC2009BA2090)~~

摘　　要：针对单中继协同混合自动重传请求(hybrid autom atic repeat request,HARQ)策略中重传时延性能不佳的问题,通过对快衰落信道下单中继HARQ系统的误码率和时延特性的研究和分析,提出一种基于目的端控制选择协作式HARQ(selective cooperative-HARQ,SC-HARQ)传输协议的实现方案,此方案是在单中继环境下根据中继链路和直达链路的链路质量判断选择重传路径的HARQ传输协议。SC-HARQ传输协议方案需要设定传输链路质量的门限值,然后根据不同的链路质量选择不同的重传模式:当直达链路质量大于设定的门限值时,选择直达链路进行重传;反之,选择完全协同HARQ传输协议进行重传。经过理论分析和MATLAB仿真验证证明,SC-HARQ传输协议方案在保证一定传输质量的前提下能够有效减小系统时延、改善系统性能。Aiming at the poor performance of retransmission delay in single-relay cooperative Hybrid Automatic Repeat Request（HARQ） system,this paper investigates the characteristics of BER and delay on the fast fading channel,proposes a selective cooperative HARQ（SC-HARQ） scheme based on link quality for single relay systems.The scheme can choose the link to retransmit in light of link quality for the direct link and the relay link in the single-relay system.The SC-HARQ scheme needs to set a threshold of link quality,and then chooses the corresponding retransmission scheme according to SNR of transmission links,and minimum retransmission delay with appropriate transmission quality guarantee.Namely,when the direct link quality is great than the threshold,system will choose the direct link to retransmission;conversely,choose the relay link.Simulation results show that this scheme can effectively decrease retransmission delay and achieve better performance in terms of system average delay with respect to traditional cooperative HARQ scheme.

关 键 词：混合自动重传请求(HARQ) 选择协作式混合自动重传请求(SC-HARQ) 时延 误码率(BER) 

分 类 号：TN929.5[电子电信—通信与信息系统]