基于分层P2PSIP的移动终端跨域切换方案

Scheme of Cross-domain Hand-off Based on Hierarchical P2PSIP

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。

This paper presented a scheme of cross-domain hand-off based on hierarchical P2PSIP. It solved the problem about positioning of station which moves among different P2P networks by combining P2P Overlay location with SIP application-layer mobility support. There are usually multiple adjacent P2P networks in a certain area in the actual deployment. We specified a standalone P2PSIP network as a domain. An infrastructure of hierarchical P2PSIP network can be adopted to enable stations in different P2P networks to communicate. When a client moves among different P2P networks, we design a set of hand-off procedure to ensure that other stations can locate the mobile one. The stations can communicate with each other directly in the hierarchical P2PSIP network. And mobile station can be located and initiate or receive a session request after making a cross-domain move.