预应式切换中的信头压缩上下文转移机制  

Context Transfer Mechanism of Header Compression During Predictive Handover

作　　者：张载龙[1] 徐小飞[1] 孙雁飞[1] 

机构地区：[1]南京邮电大学信息网络技术研究所,南京210003

出　　处：《应用科学学报》2011年第4期374-380,共7页Journal of Applied Sciences

基　　金：国家"863"高技术研究发展计划基金(No.2009AA01Z212;No.200901Z202);国家自然科学基金(No 61003237;No.70871061);南京邮电大学校科研基金(No.NY210012)资助

摘　　要：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.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.

关 键 词：移动IPV6 信头压缩 上下文转移 无缝切换 二层触发器(L2T) 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]