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Performance evaluation of SIP-based multimedia services in UMTS

机译：UMTS中基于SIP的多媒体服务的性能评估

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摘要

With an ever increasing penetration of IP technologies and the tremendous growth in wireless data traffic, the wireless industry is evolving the mobile core networks towards IP technology. The third Generation Partnership Project (3GPP) has specified an IP multimedia sub-system (IMS) in UMTS Release 5/6, which is adjunct to the UMTS packet-switched (PS) GPRS core network. This IP-based network provides full packet call control capabilities by using the text-based Session Initiation Protocol (SIP). Initial indications, as to the signalling delay associated with SIP messages, have concerned mobile operators about the viability of SIP services over the UMTS air interface. This article provides an insight into the UMTS system performance, focusing on selected UMTS SIP-based services. Typical services with real-time requirements such as voice as well as delay-sensitive and non-sensitive applications, such as real-time chat and instant messaging services are investigated. Furthermore, the paper discusses and analyses the requirements and possible solutions for improving efficiency of SIP usage in a wireless environment through signalling protocol message compression. Results of a performance evaluation of SIP signalling scenarios are presented in terms of time delay and message overload in the system. Results show that message compression can considerably reduce SIP message transmission time on the radio access network while core network delay contributions are found to be still high.
机译：随着IP技术的不断增长和无线数据流量的巨大增长，无线行业正在将移动核心网络向IP技术发展。第三代合作伙伴计划（3GPP）在UMTS版本5/6中指定了IP多媒体子系统（IMS），该子系统是UMTS分组交换（PS）GPRS核心网络的辅助设备。这个基于IP的网络通过使用基于文本的会话发起协议（SIP）提供了完整的数据包呼叫控制功能。关于与SIP消息相关的信令延迟的初始指示，已使移动运营商关注UMTS空中接口上SIP服务的可行性。本文提供了有关UMTS系统性能的见解，重点介绍了选定的基于UMTS SIP的服务。对具有实时要求的典型服务（例如语音）以及对延迟敏感和不敏感的应用程序（例如实时聊天和即时消息传递服务）进行了研究。此外，本文讨论并分析了通过信令协议消息压缩来提高无线环境中SIP使用效率的要求和可能的解决方案。 SIP信令方案的性能评估结果以时间延迟和系统中的消息过载的形式呈现。结果表明，消息压缩可以显着减少无线电接入网络上SIP消息的传输时间，而发现核心网络的延迟贡献仍然很高。

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