| 摘要: |
| 无线IP网中,为了能够有效利用带宽资源,使提供实时业务具有经济上的可行性和现实性,必须采用报头压缩技术减小协议报头带来的额外开销.然而,现有的报头压缩方案在设计时没有考虑无线信道状态.为了能够更好地适应无线链路特性,提出并分析了一种无线IP网络中针对实时流的基于信道状态的健壮报头压缩算法.该算法通过对无线信道状态的精确估计来调节报头压缩器中W-LSB编码的可变滑动窗口的大小,在压缩率和抗差错健壮性之间能够实现好的平衡,并适应特性经常变化的无线链路.最后,通过仿真结果证明该算法在无线链路上的有效性. |
| 关键词: 健壮报头压缩 信道状态 W-LSB编码 无线IP网络 |
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| 基金项目:Supported by the National Natural Science Foundation of China under Grant Nos.60272098, 60272078 (国家自然科学基金); the National High-Tech Research and Development of China under Grant No.2001AA112051 (国家技术研究发展计划(863)) |
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| A Header Compression Algorithm for Real-Time Streams in Wireless IP Networks |
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WU Yi-Chuan,ZHENG Jian-Ping,HUANG Kui,ZHAO Zhuang,WU Zhi-Mei
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| Abstract: |
| In wireless IP networks, it is necessary to adopt header compression schemes for the reduction of the protocol header size in order to save the scarce wireless bandwidth resource and make real-time services economically feasible and physically realizable. However, all the existing header compression schemes have not taken wireless channel state into consideration when designed. For a better usage over wireless links, a new channel state based robust header compression algorithm (CSB-ROHC) for real-time streams in wireless IP networks such as 3G platforms is proposed and analyzed in this paper. Through adjusting the dimension of VSW in W-LSB encoding (a key parameter in header compressor) with the accurate estimation of wireless channel state, this new algorithm can achieve a good balance of compression ratio and error-resistant robustness for its adaptive usage over wireless links. The authors present simulation results that demonstrate the effectiveness of the CSB-ROHC algorithm over wireless links. |
| Key words: robust header compression channel state based W-LSB encoding wireless IP networks |
