基于排队论的列调SIP代理服务器性能分析  

Performance Analysis of SIP Proxy Server in Train Dispatching Based on Queuing Theory

作　　者：周贵[1,2] 刘峰[1,2] 

机构地区：[1]北京交通大学计算机与信息技术学院,北京100044 [2]高速铁路网络管理教育部工程研究中心,北京100044

出　　处：《计算机工程》2014年第8期233-236,241,共5页Computer Engineering

基　　金：国家"863"计划基金资助项目"复杂装备运维服务专业化构件与系统开发"(2012AA040912)

摘　　要：在铁路无线列调系统中,会话初始化协议(SIP)代理服务器通过解析和转发SIP传入数据包提供呼叫路由服务,其效率将直接关系到铁路交通运输的安全和可靠。针对铁路实际场景对于SIP代理服务器性能的特定需求,通过研究分析SIP代理服务器的工作体系结构,提出WiMAX网络环境下基于M/G/1排队论的SIP代理服务器模型,对其主要性能指标如SIP呼叫平均响应时间以及系统中的平均SIP呼叫数进行分析预测,并在实际应用场景中进行实验。测试结果表明,当每秒并发通话数小于400时,基于该模型的SIP代理服务器体系结构中SIP消息的平均响应时间不超过20 ms,能够满足铁路实际场景需求,基于该模型的分析预测也可以为无线列调系统的部署和优化提供有效的参考。In the railway wireless train dispatching system,the Session Initiation Protocol（SIP） proxy server provides call routing services by parsing and forwarding all the incoming SIP packets in an IP telephony network.The efficiency of this procedure is directly related to the safety and reliability of rail transportation.In this paper,through the research analysis of SIP proxy server architecture,it proposes the M/G/1 queuing model based on the SIP proxy server in WiMAX network environment and studies some of the key performance benchmarks such as average response time to process the SIP calls and mean number of SIP calls in the system to meet the practical requirement.Experimental results show that the average response time is not beyond between 20 ms while the number of calls is not beyond between 400 per second.It meets the actual need very well.And the model can be used to predict the performance of the SIP proxy server,and provide useful reference for the deployment and optimization of the wireless train dispatching system.

关 键 词：WIMAX网络 会话初始化协议(SIP) M G 1模型 代理服务器 列调系统 响应时间 

分 类 号：TP303[自动化与计算机技术—计算机系统结构]