关键词: 会话初始化协议, LZSS算法, 算术编码, 信令压缩

Abstract: Independent Media Services (IMS) is a subsystem to support IP Multimedia services, working in the 3rd Generation Partnership Project (3GPP) of version 5. IMS uses Session Initiation Protocol (SIP) to establish and maintain multi-media session; however, oversized SIP message based on text is becoming a bottleneck under IMS wireless circumstances. Under the framework of SigComp, a new algorithm based on improved Lempel-Ziv-Storer-Szymanski (LZSS) algorithm and arithmetic combination was presented to compress SIP signaling. Simulation results prove that the new algorithm has higher compression efficiency. It is valuable for IMS SIP session setup delay.

Key words: Session Initiation Protocol （SIP）, Lempel-Ziv-Storer-Szymanski （LZSS） algorithm, arithmetic coding, signaling compress