无线数据传输的GBN-ARQ和SR-ARQ系统时延性能研究  

Research on the Delay Performance of GBN-ARQ and SR-ARQ Systems in Wireless Data Transmission

作　　者：黎锁平[1] 刘存明[1] 何志鹏[2] 

机构地区：[1]兰州理工大学理学院运筹与控制研究所,甘肃兰州730050 [2]兰州理工大学计算机与通信学院,甘肃兰州730050

出　　处：《信号处理》2009年第3期384-388,共5页Journal of Signal Processing

基　　金：教育部"春晖计划"基金(Z2006-1-62006);甘肃省高校研究生导师科研基金(0703-10);兰州理工大学优秀中青年教师基金(Q200106)资助。

摘　　要：自动请求重传协议GBN-ARQ和SR-ARQ是无线通信系统中重要的差错控制技术。在研究其传输机制的基础上考虑分组长度、数据链路的传播时延、处理时延以及反馈时延的影响,基于等效服务时延的思想建立了分组长度为m的GBN-ARQ和SR-ARQ系统排队时延模型,求得了两系统的分组平均等待时延和平均服务时延的解析式,也即对两系统实施滑动窗口长度控制的理论模型。由此可以通过检测系统传输环境的改变而自适应的改变窗口长度,实现最佳的系统时延性能以及吞吐量性能。基于该模型的仿真分析又说明了窗口长度以及分组长度的改变对GBN-ARQ系统时延的影响要大于SR-ARQ系统,在理论上证实了SR-ARQ系统发送效率确实优于GBN-ARQ系统。Automatic Repeat Request protocols of both GBN-ARQ and SR-ARQ are the basic error-control schemes in wireless communication. In this paper, through analyzing the transmission schemes, the delay performances of both above protocols are studied based on Equivalent Service Time, which takes into account the packet length （m unit-times）, the propagation delay and the procession delay and the receiver feedback delay. We also educed the formulations of the mean packet waiting time and mean packet service time, which can be applied to control the sliding windows length of both systems. So the optimum delay and throughput performances of both systems can be gotten by changing the sliding window length adaptively according to the change of transmission conditions Furthermore, the simulations show that the variations of sliding windows length and packet length can bring more effect on GBN-ARQ than on SR- ARQ,and also prove that the transmission efficiency of SR-ARQ is better than GBN-ARQ theoretically.

关 键 词：GBN—ARQ SR—ARQ M/G/1排队系统 等效服务时延 平均服务时延 

分 类 号：TN915.01[电子电信—通信与信息系统] N945.12[电子电信—信息与通信工程]