无线多播中基于网络编码的 QoS 研究

摘要

Using network coding in wireless networks can increase throughput and reduce energy consumption. Recently there are many works focusing on how to utilize network coding to increase throughput while there are few works considering the quality of service . This paper focuses on network coding based broadcast scheduling in wireless networks with the packet delay constraint and aims at minimizing the number of retransmissions. We will combine two encoding and scheduling schemes, analyze their respective advantages and disadvantages, and dynamically select the scheme. Simulation results show that our algorithm can reduce the number of retransmissions.%在无线网络中使用网络编码可以提高吞吐量和降低能耗.近来，有许多工作在研究如何利用网络编码来提高吞吐量，但是很少有考虑到 QoS.本文重点研究在实时无线网络中数据包在延时约束条件下，网络编码的广播调度问题，目标是在数据包的误时率(deadline miss ratio)容许范围内，减少重传包的数量.我们将综合两种编码调度方案，阐释各自的优劣，动态地选取编码方案.仿真结果显示，我们的算法可以有效减少重传包的数量.