基于TDD上行CSI的自适应预重传GBN-HARQ方案  

Uplink CSI based adaptive predicted repeat GBN-HARQ scheme

作　　者：戴翠琴[1] 张刚[1] 罗捷[1] 杨静[1] 

机构地区：[1]重庆邮电大学移动通信重点实验室,重庆400065

出　　处：《计算机应用研究》2014年第2期496-499,514,共5页Application Research of Computers

基　　金：国家自然科学基金资助项目(61171111);重庆市自然科学基金资助项目(cstc2012jjA40042);重庆市教委优秀成果转化资助项目(Kjzh11206)

摘　　要：针对预重传GBN-ARQ方案在误码率低的情况下吞吐率与时延大大下降的问题,结合重传编码合并技术,提出了一种基于TDD上行CSI的自适应预重传GBN-HARQ方案。首先,发送端将数据进行前向纠错编码得到不同冗余版本;然后,根据上行CSI信息对重传分组自适应地选择冗余版本数,在信道状况较差时一次性传输多个冗余版本以保证预重传的可靠性,减小由预重传错误所带来的时延性能下降,在信道状况较好时采用较少冗余以保证较高的吞吐率;最后,分析比较了传统GBN-ARQ方案、预重传GBN-ARQ方案和自适应预重传GBNHARQ方案在不同情况下的吞吐率性能。理论和仿真分析表明,在误码率大于10-1时自适应预重传GBN-HARQ方案的吞吐率比传统GBN-ARQ方案提升了0.1左右,比预重传GBN-ARQ方案提升了0.05左右,在误码率较大的情况下,基于编码合并技术的自适应预重传GBN-HARQ方案能够更好地保证预重传的可靠性。Abstract： This paper proposed an uplink CSI based adaptive pre-repeat GBN-HARQ scheme to solve the problem that the throughput and delay of traditional pre-repeat GBN-ARQ scheme declined greatly at low BER. First, transmitter encoded the data with FEC and obtained different redundant versions. And then, the method adaptively chose the number of redundant ver- sions for retransmission packets according to the uplink CSI, transmitted multiple redundant versions to ensure the reliability Of pre-repeat transmission in the poor condition of wireless channel and reduce delay caused by the error in retransmission and it used few redundancies to ensure high throughput in the good condition of wireless channel. Finally, it compuared and ana- lysed the throughput for the traditional GBN-ARQ scheme, pre-repeat GBN-ARQ scheme and adaptive pre-repeat GBN-HARQ scheme. The simulation results show the throughput of adaptive pre-repeat GBN-HARQ scheme improves about 0.1 than tradi- tional GBN-ARQ scheme and about 0.05 than pre-repeat GBN-ARQ scheme as the BER exceeds 10-1, that is to say, the up- link CSI based adaptive pre-repeat GBN-HARQ scheme can further guarantee the reliability at high BER.

关 键 词：回退N步式混合自动重传请求 时分双工 信道质量信息 预重传 吞吐率 

分 类 号：TN929.5[电子电信—通信与信息系统]