流媒体无线Mesh网中基于机会路由的网络编码

Network coding based on opportunistic routing in streaming media wireless mesh networks

采用机会路由下无线Mesh网络的链路吞吐量模型,利用确定性网络演算工具,得到无线Mesh网络节点数据积压的上界以及端到端数据流延迟和抖动的上界;设计满足流媒体服务质量的确定性网络编码(DNC),提出ETC作为确定机会路由中编码节点的指标,在节点数据积压未达到上界时,编码节点采用网络编码,提高网络的性能;提出ETP作为机会路由中选择候选节点的指标,主要考虑端到端的延迟和延迟抖动确定接收数据的候选集,然后,在侯选集中选择ETC最大的节点进行编码。仿真结果表明:吞吐量在增加的同时,端到端的延时和抖动值下降。

Using a deterministic network calculus tool,the wireless mesh network nodes＇ backlog upper bound,the end-to-end upper delay bound and the end-to-end upper delay jitter bound were derived,based on the existing link throughput model of opportunistic routing;and then a deterministic network coding（DNC） which meets the QoS of streaming media was designed.An expect transmission coding（ETC） considering the node＇s backlog upper bound was proposed to a guide line which determines the coding nodes.In order to improve the performance,the encode nodes using network coding before the node＇s backlog upper bound was exceeded.The represented expect transmission performance（ETP） considering the jitter and the end-to-end upper delay jitter bound was a guide line which determines the received candidate nodes.The data packets were encoded among the candidate nodes by the max ETC.Comprehensive simulations and results show that the throughput is improved,and the delay time and jitter of end to end are degraded.