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本文在介绍Presence业务模型的基础上,分析了当前Presence业务提供方法在健壮性和扩展性方面存在的问题,并结合P2P-SIP的网络结构体系,提出了一种无中心的Presence业务提供方法。该方法基于DHT的storage模型,实现了Presence信息的分布式发布与查询,有效地解决了传统Presence业务提供中的单点失效和热点效应问题。本文详细描述了这种业务提供方法的系统结构、业务流程和信令流程等,也给出了该方法的相关特点分析和总结。
On the basis of introduction of Presence business model, this paper analyzes the problems of robustness and scalability of the current Presence service provisioning method. Combined with P2P-SIP network architecture, this paper proposes a decentralized Presence service delivery method. This method based on DHT storage model realizes the distributed release and query of Presence information and effectively solves the single point of failure and hot spot effect in the traditional Presence service. This paper describes in detail the system structure, business process and signaling process of this kind of service provision, and also gives the analysis and summary of the related features of this method.