IMS中一种新的基于SigComp的SIP压缩机制  

A New SIP Compression Mechanism Based on SigComp in IMS

作　　者：林晖[1] 许力[1] 

机构地区：[1]福建师范大学数学与计算机科学学院

出　　处：《电子与信息学报》2008年第7期1594-1597,共4页Journal of Electronics & Information Technology

基　　金：重庆市教委科学技术研究项目(KJ050512,KJ050513);重庆市科委自然科学基金(CSTC2005BB2054)资助课题

摘　　要：IMS(IP Multimedia Subsystem)中采用SIP(Session Initiation Protocol)协议建立和维护多媒体会话。然而,SIP是基于文本消息的协议,在会话建立的过程中需要传输大量的比特,加大会话建立的时延。该文基于SigComp(Signaling Compression)框架结构,将改进后的LZW算法和HUFFMAN算法相结合,提出LZW-HUFFMAN算法。实验结果表明,新算法具有更高的压缩效率,有效地降低了传输时延,缩短了会话建立的时间。SIP is used in IMS to perform multimedia session setup and maintenance. However, it is text-based and has large messages with sizes frequently exceeding several hundred bytes during the session setup. As a result, it causes more call setup delay. Based on the SigComp, a new algorithm with improved LZW and HUFFMAN is proposed in this paper, which is named as LZW-HUFFMAN. Simulation results prove that the new algorithm can effectively reduce the message sizes and shorten the session setup delay.

关 键 词：信令压缩 压缩机制 时延 IP多媒体子系统 服务质量 

分 类 号：TN919.85[电子电信—通信与信息系统]