无线Mesh网中可靠SIP呼叫连接的选路技术

Reliable Route Selection Technique for SIP Calling Connection in Wireless Mesh Networks

在无线Mesh网中布设基于SIP的应用,是在缺少通信基础设施的地区实现多媒体应急通信的有效方式,但是易失效的无线链路会降低通信的可靠度。研究了如何在无线Mesh网中向SIP服务器高效地转发SIP呼叫请求消息。提出了一点对多点中任意一点的可靠度度量模型,用于描述实时、有限尝试次数的呼叫连接通信的可靠性;基于呼叫成功率、呼叫连接速度这两个优化目标提出了一种路集选择方法,并展开了对这种方法的通信可靠度上下界的分析和比较;最后通过仿真实验验证了此路集选择方法的有效性和优越性。

Deploying SIP based application in wireless mesh networks can provide ubiquitous multimedia emergency communication in infrastuctureless areas,but unreliable wireless links may decrease communication reliability.This paper investigated the route selection method for message forwarding in wireless mesh networks.A new reliability model was proposed to measure the one-to-anyone-from-many communication for real-time calling setup with limited number of attempts.A route selection method was proposed for optimizing calling success ratio and calling setup speed,followed by theoretical analysis and comparison on upper and lower bound for communication reliability.Finally,a series of simulation experiments were designed and conducted to verify the effectiveness and superiority of the method.