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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.
In the wireless IP network, in order to be able to utilize the bandwidth resource effectively, make it economically feasible and realistic to provide the real-time business, it is necessary to adopt the head compression technology to reduce the overhead brought by the protocol header .However, the existing header compression scheme In order to be able to adapt to the radio link characteristics better, a robust channel header-based header compression algorithm for real-time streaming in wireless IP networks is proposed and analyzed.This algorithm is based on the wireless channel state Precise estimation adjusts the size of the variable sliding window of the W-LSB coding in the header compressor to achieve a good balance between compression ratio and robustness against errors, and adapt to a wireless link with frequently changing characteristics.Finally, The result proves the validity of the algorithm on the wireless link.