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| 无线多媒体传感器网络中一种自适应的报头压缩机制 |
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周新运1,2, 孙利民1, 皇甫伟1, 牛建伟3
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1.中国科学院,软件研究所,北京,100080;2.中国科学院,研究生院,北京,100049;3.京航空航天大学,计算机学院,北京,100083
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| 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. |
| 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 |
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| 基金项目: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 Research 973 Program 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)) |
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| An Adaptive Header Compression Scheme in Wireless Multimedia Sensor Networks |
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ZHOU Xin-Yun,SUN Li-Min,HUANGFU Wei,NIU Jian-Wei
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| Abstract: |
| 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 improve channel utilization efficiency. Based on the characteristics of WMSNs,an advanced adaptive header 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. |
| Key words: wireless multimedia sensor network header compression W-LSB(window-based least significant bits) encoding UDP(user datagram protocol) Lite |
