IMS中一种新的基于SigComp的SIP压缩机制
doi: 10.3724/SP.J.1146.2006.01934
A New SIP Compression Mechanism Based on SigComp in IMS
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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。Abstract: 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.
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