论文部分内容阅读
移动通信网络中,建立一次多媒体会话通常需要数十秒钟的时间。通过对信令消息的压缩可以有效地减少所需时延,改善服务质量。文章先后使用了LZ77、LZW和Deflate压缩算法对因特网协议多媒体子系统中的会话发起协议信令消息的压缩进行了研究。仿真结果显示:Deflate算法的压缩性能最好,不使用辞典时压缩率可以达到30%,使用辞典时压缩率可以达到50%以上;接着是LZW算法,而LZ77算法的压缩性能最差。
In a mobile communication network, it usually takes tens of seconds to set up a multimedia session. The compression of signaling messages can effectively reduce the required delay and improve the service quality. The article has used LZ77, LZW and Deflate compression algorithms to study the compression of Session Initiation Protocol signaling messages in the multimedia subsystem of Internet Protocol. The simulation results show that the deflate algorithm has the best compression performance, the compression rate can reach 30% when not using the dictionary, and the compression rate can reach more than 50% when using the dictionary. The LZW algorithm is followed by the LZ77 algorithm, while the compression performance is the worst.