多信道多跳无线网络端到端时延最小化路由评价指标的研究

A Routing Metric for Delay-sensitive Applications in Heterogeneous Multi-radio Multi-channel Wireless Networks

提出一种适用于多接口多信道无线网络的路由评价指标,DSRM.与传统的评价指标单纯注重网络吞吐量相比,DSRM采用整条路径的端到端时延作为评价指标,以适应日益频繁的时延敏感的应用需求.在DSRM中,综合考虑了网络传输过程中的竞争接入时延、基于等效带宽计算的传输时延、节点内的信道队列因素,并分析了整条路径的端到端重传时延.通过Qualnet仿真,证明了DSRM较WCETT、WEED等路由评价指标在平均端到端时延等网络性能参数上有了明显提升.

We address the problem of routing for multi-radio multi-channel wireless networks,and propose a novel routing metric,named DSRM.Compared with the prior routing metrics focus on the network throughput,DSRM aims to minimize the end-to-end delay,which is a significant requirement for delay-sensitive applications.Our routing metric captures the effects of random access delay caused by channel competition,variation in link loss-ratio,the length of queue,inter-flow and intra-flow interference as well as retransmit delay.To evaluate the efficacy of our routing metric,we conduct extensive simulations using Qualnet.Simulation results demonstrate the effectiveness of DSRM to improve the network performance in terms of end-to-end delay and so on.