摘要
IMS(IP多媒体子系统)采用SIP协议建立和维护多媒体会话,但SIP是基于文本的协议,消息比较大,当应用于带宽小的无线网络时,会增加会话建立的时延。为缩短会话建立时间,有必要对SIP消息进行压缩。针对单一的使用压缩算法在SIP信令压缩性能方面的不足,本文在Deflate压缩算法的基础上,采用不同的压缩策略,对SIP消息实现了压缩。仿真结果表明,静态字典、用户自定义字典和共享压缩的组合方案得到了最好的压缩效果,压缩后的消息平均大小仅为原来消息大小的14%左右。
SIP is used in IMS（ IP Multimedia Subsystem）to perform muhimedia session setup and maintenance. However, SIP is text-based and has large message size, when applied to small-bandwidth wireless network, it will increase the delay of session setup. In order to reduce the call setup delay, it is necessary to compress SIP message. Since single algorithm can not effectively compress SIP signaling messages, based on Deflate compression algorithm, SIP signaling compressions are achieved using different schemes. The simulation results show that the combinatorial scheme of static dictionary, user-defined dictionary and share compression has the best effect,the size of the compressed message,on the average,is around 14% of the original message size.
出处
《电子测试》
2009年第7期30-33,共4页
Electronic Test
关键词
SIP
信令压缩
SigComp
IMS
Session Initial Protocol
Signaling compression
SigComp
IP Multimedia Subsystem
