车载自组网中基于滑动窗口的网络编码传输策略  

Sliding Window-based Network Coding Transmission Scheme for Vehicular Ad hoc Networks

作　　者：王万良[1] 李桂森[1] 姚信威[1] 岑跃峰[1] 

机构地区：[1]浙江工业大学计算机科学与技术学院,杭州310023

出　　处：《计算机科学》2012年第9期85-88,93,共5页Computer Science

基　　金：国家自然科学基金项目(61070043)资助

摘　　要：由于节点的高速移动和拓扑的快速变化,使得在车载自组网中传输时延敏感的数据是一个很大的挑战。针对此问题,提出了一种在机会路由上使用基于滑动窗口的网络编码传输策略。该策略根据网络状态自适应地调整滑动窗口的大小,来编码不同长度的编码包,去容忍ACK的延迟,使得在各种网络条件下都能保持较高的吞吐率;使用下三角形式的渐进编码使接收端逐步解码,从而平滑接收端的解码时间间隔。仿真结果表明,该策略具有更高的吞吐率,同时能够在接收端形成时延抖动小的数据流,为车载自组网中流媒体等时延敏感的数据流传输提供更好的服务质量。Time-sensitive data transmission in vehicular Ad hoc networks（VANET）is particularly challenging due to the high mobility and the rapidly changing topology.To address this problem,we proposed a scheme that uses network coding with dynamic sliding window in opportunistic routing.By adjusting the window size according to the network status,it encodes different number of native packets into a coded packet such that it can tolerate the acknowledgement delay and improve the throughput in different cases.The scheme uses a lower triangular matrix coding method to smooth the decoding interval in the receiver.Simulations show that the scheme is able to increase the throughput and decrease the delay jitter efficiently.It is especially appropriate for time sensitive multimedia applications in VANET.

关 键 词：滑动窗口 网络编码 机会路由 车载自组网 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]