IMS中核心控制网元S-CSCF可靠性方案

摘要

IMS中核心网元S-CSCF的可靠性是保障IMS服务连续性的关键,是部署商用IMS网络的前提.在分析了S-CSCF功能特点的基础上,设计和实现了一种S-CSCF可靠性方案,给出了在S-CSCF提供服务的过程中,需要备份的内容、备份的时机、保证数据一致性策略、故障检测与主备服务器切换策略以及恢复策略,并在开源项目OpenIMSCore中实现和验证了该方案.实验结果表明,这一方案有效可行、备份代价较小,当工作机S-CSCF1发生故障时,备份机S-CSCF2能够在不影响服务用户的体验的情况下,迅速恢复服务.%The reliability of the core control network-element S-CSCF in IMS is the key to assure the continuity of IMS services as well as the precondition to deploy the commercial IMS networks. Based on the analysis of S-CSCF's functions and features, the paper proposes an approach to design and implement an S-CSCF reliability scheme, and discusses in detail the contents and occasion to be backed up in the process of the S-CSCF providing services, the policy to assure data consistency, fault detection, switch in the main and standby server, recovery as well. Additionally, we carry out an experiment on S-CSCF with the reliability scheme in the OpenlMSCore, an open source project. The results show that the reliability scheme is not only feasible and effective, but also costs less in data backup. When the main S-CSCFI goes wrong, the standby S-CSCF2 can rapidly recover without influencing the experience in user's enjoying services.