We study context transfer mechanism to reduce large overhead in re-establishing context of header compression, and propose a two-step method for context transfer of header compression and a real-time trigger strategy for context transfer using link-layer trigger. The proposed approach avoids the expensive process of context re-establishment of header compression by transferring header compression context when handovers are required. The handover delay, packet loss and state migration of header compression with and without context transfer of header compression are evaluated with NS2. Simulation results show that the method can establish and synchronize context at the compressor and decompressor so as to reduce the handover impact on header compression.%为了解决切换过程中重新建立信头压缩上下文开销大的问题,研究了上下文转移机制,提出了一种两步信头压缩上下文转移方法和使用二层触发器的实时上下文转移触发策略,通过转移信头压缩上下文,避免切换时重新建立信头压缩上下文的过程.评估了有上下文转移和无上下文转移机制下的时延、丢包和信头压缩状态迁移情况,仿真结果表明,所提方案能够建立并同步压缩器和解压器处的上下文,减小切换对信头压缩的影响.
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