中文摘要：

本文在注重提高IP网络服务可生存性的同时,也兼顾了服务可区分性的要求,提出了一种基于客户端的主动服务漂移模型,即CPSM,Client-side Proactive Service Migration model.该模型把服务漂移抽象为一个部分可观测马尔可夫决策过程,用以增强服务漂移对动态不确定性网络环境的自适应能力.在信息预报和信任机制的基础上,通过对网络状态的不断观测和分析,CPSM模型可以计算出使客户获益最高的服务漂移策略.

英文摘要：

In order to enhance IP service survivability as well as to support the differentiated services,the paper puts forward a client-side proactive service migration model,called CPSM.On the basis of information forecast and trust mechanism,the model abstracts service migration as a partially observable Markov decision process（POMDP） in order to adapt it to the dynamic nondeterministic network environments,and to calculate the most rewarding service migration strategy to the client.The simulation results show that the model is able to maintain service continuity at the user-perceived level,and to shorten the average response time of services.Moreover,this model can ensure the user′s quality of experience（QoE） effectively and make it more reasonable and feasible to pay for quality of service（PQoS）.