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The convergence of mobile technologies and Internet protocols makes "all-IP network" be the actual trend of development for future telecommunication system. In such a system, both wired and wireless parts are built on a common network platform based on TCP/IP protocol. However, TCP/IP protocol headers are relatively large and need to be compressed to save radio channel bandwidth (the most expensive and scarce resource of the whole wireless system), especially for some services whose pay load size is small. In this paper, we propose and analyze a channel state dependent robust TCP/IP header compression algorithm (CSDROHC) for 3G wireless networks. Through adjusting the dimension of variable sliding window (VSW) of W-LSB encoding in header compressor with the accurate estimation of wireless channel state, CSDROHC can achieve the good balance of compression ratio and error-resistant robustness for its adaptive use in wireless links. Simulation results are presented to demonstrate the effectiveness of CSDROHC over wireless link.