无线多媒体传感器网络中一种自适应的报头压缩机制  

An Adaptive Header Compression Scheme in Wireless Multimedia Sensor Networks

作　　者：周新运[1,2] 孙利民[1] 皇甫伟[1] 牛建伟[3] 

机构地区：[1]中国科学院软件研究所 [2]中国科学院研究生院,北京100049 [3]北京航空航天大学计算机学院

出　　处：《软件学报》2007年第5期1122-1129,共8页Journal of Software

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.60472076;60673178;60434030(国家自然科学基金);the National Grand Fundamental Research973Program of China under Grant No.2006CB303007(国家重点基础研究发展规划(973));the National High-Tech Research and Development Plan of China under Grant.Nos.2006AA01Z218;2006AA01Z215(国家高技术研究发展计划(863))

摘　　要：无线多媒体传感器网络传输大数据量的音频、视频、图像等数据,需要高效地利用宝贵的无线信道资源.报头压缩技术能够减小传输的数据量,提高信道利用效率.提出一种自适应的报头压缩机制AAHC,基于对信道状态的准确估计,动态调整压缩算法的参数,并使用UDP(user datagram protocol)Lite协议作为传输层协议.AAHC机制在获得较高压缩效率的同时,可保证报头压缩的抗差错鲁棒性.仿真结果表明,AAHC机制的性能优于传统的ROHC(robust header compression)机制和CRTP(compressed RTP)机制.Wireless multimedia sensor networks （WMSNs） transfer information-intensive data （e.g. audio, video, image）, so it is necessary to utilize wireless channel efficiently. Header compression is a useful mechanism which can reduce the amount of data transferred and can characteristics of WMSNs, an advanced adaptive header improve channel utilization efficiency. Based on the compression （AAHC） scheme is proposed, which adjusts the parameters of compression algorithm according to the exact estimation of wireless channel state and adopts UDP （user datagram protocol） Lite as its transport layer protocol. This scheme can get high compression ratio and error-resistant robustness at the same time. The simulation results show that AAHC scheme outperforms the traditional ROHC （robust header compression） scheme and CRTP （compressed RTP） scheme.

关 键 词：无线多媒体传感器网络 报头压缩 W-LSB(window-based least significant bits)编码 UDP(user DATAGRAM protocol)Lite 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]