无线单跳场景下基于网络编码的新型传输模型  

Novel transmission model based on network coding in one-hop wireless networks

作　　者：陆一飞[1,2] 沈呈[1,2] 陶军[1,2] 夏勤[1,2] 

机构地区：[1]东南大学计算机网络和信息集成教育部重点实验室,南京210096 [2]东南大学计算机科学与工程学院,南京210096

出　　处：《东南大学学报（自然科学版）》2009年第4期705-709,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金重大研究计划资助项目(90604003);国家自然科学基金资助项目(60603067);中国下一代互联网示范工程项目CNGI网络总体研究资助项目(CNGI-04-16-1S)

摘　　要：为了解决无线链路易出错从而降低传输效率以及由于重传导致数据流间传输不公平的问题,基于网络编码思想提出了一种新的编码组重传模型.在无线单跳信道易错场景下,利用无线广播传输和重传特性,设计了基于编码组重传模型的新型单跳传输算法.根据编码系数产生方式的不同,该算法又分为随机编码组重传算法和启发编码组重传算法.实验结果表明:编码组重传算法的传输延迟和吞吐量略差于单播ARQ传输技术,在信道突发出错情景下,单播ARQ传输技术吞吐量急剧下降,而编码组重传算法下的吞吐量能够维持稳定.编码组重传算法能够有效保证无线传输效率以及数据间传输的公平性.To solve the problem of efficient transmission in error-prone wireless networks and unfairness attribute to retransmission, inspired by network coding, a retransmission model based on coding group （RTCG） is proposed. Using the characteristics of wireless broadcast and retransmission in one-hop wireless networks, a novel transmission algorithm based on RTCG （ARTCG） is designed. Furthermore, the algorithm can be classified into random ARTCG and heuristic ARTCG according to the difference of generating coding coefficient. The experimental results show that the transmission delay and the throughput of the ARTCG are slightly worse than those of automatic repeat request （ARQ） technique. The ARTCG can keep the throughput stabilization compared with ARQ which will sharply decrease the throughput under the condition of channel＇s burst error. The ARTCG can guarantee the transmission efficiency and fairness of different data flows.

关 键 词：网络编码 编码组 吞吐量 传输公平性 单跳传输 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]