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提出了一种基于分层P2PSIP的移动终端跨域切换方案。通过结合P2P定位方式和SIP(Session InitiationProtocol)应用层对移动切换的支持,解决了终端在不同P2P覆盖网间移动后定位的问题。基于SIP的终端在不同IP子网间移动后,为了正常定位和维持当前会话,必须采取某种移动切换机制。常用的切换机制包括Mobile IP方式和SIP应用层的移动切换支持。在分布式P2PSIP环境中,移动切换问题仍然存在。实际环境中,一定范围内往往有多个相邻的P2P覆盖网,为了使处于不同P2P覆盖网的终端之间可以互相定位和发起会话,可以将独立的P2PSIP网络划分为两个层次,分别用于内部SIP会话和不同P2P网络间的交互。分析并扩展了分层P2PSIP的网络架构,设计了一套对应的切换方案,使得处于分层P2PSIP中的任意两个终端之间可以被定位和发起跨域会话。
A cross-domain handover scheme for mobile terminals based on hierarchical P2PSIP is proposed. By combining the P2P positioning mode and SIP (Session Initiation Protocol) application layer support for mobile switching, the terminal solves the problem that the terminal locates after moving between different P2P overlay networks. After the SIP-based terminal moves between different IP subnets, in order to locate and maintain the current session normally, some kind of mobile switching mechanism must be adopted. Common switching mechanisms include Mobile IP mode and SIP application layer mobile switching support. In a distributed P2PSIP environment, mobile switching problems still exist. In a real environment, a plurality of adjacent P2P overlay networks usually exist within a certain range. In order to locate and initiate sessions between terminals in different P2P overlay networks, an independent P2PSIP network may be divided into two levels, respectively Interaction between internal SIP sessions and different P2P networks. This paper analyzes and extends the hierarchical P2PSIP network architecture and designs a corresponding handover scheme so that any two terminals in layered P2PSIP can locate and initiate cross-domain sessions.