In order to solve the problems of long handover delay and high packet loss rate existing in FMIPv6, an improved scheme named PI-FMIPv6 was designed. Information learning, proxy binding and the tunnel timer were introduced into it so as to complete the configuration of the New Care-of Address (NCoA), Duplicate Address Detection (DAD), Binding Update (BU) by advancing and managing the tunnel, π-calculus was used to define and deduce the mathematical model about PI-FMIPv6. It is proved that the optimized scheme PI-FMIPv6 is standard and precise. Furthermore, the simulation results from the NS-2 show that PI-FMIPv6 can reduce the handover delay by 60. 7% and packet loss rate by 61. 5% at least compared to FMIPv6, which verifies that the PI-FMIPv6 is superior to FMIPv6 and can better meet the real-time requirement.%为解决FMIPv6的切换延迟长和丢包率高的问题,提出一种改进方案PI-FMIPv6.该方案通过引入信息学习机制、绑定代理机制及隧道定时器,将转交地址配置、重复地址检测、绑定注册等工作提前完成,并合理设置隧道生存期,优化了FMIPv6切换流程.通过π演算对PI-FMIPv6方案进行数学模型定义和推导,证明了PI-FMIPv6方案的规范性和严谨性.同时,NS-2仿真结果表明,改进方案PI-FMIPv6相对原FMIPv6方案减少至少60.7％的切换延迟和61.5％的丢包率,验证了其性能优于FMIPv6,更好地满足了实时业务的需求.
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