蒋艳 郭伟 刘伟
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摘要: 在升空平台通信系统中,当移动用户终端移动到另一个平台时,它的IP地址会发生改变。当用户终端改变接入网络时,能够自动获得一个新的IP地址。用户终端被重新分配一个新的地址之后,要向归属域进行重新IMS注册,而且向通信对端节点发送重新会话邀请请求RE_INVITE,这样会话才能继续。这样的做法会给正在进行的会话带来很长的中断和延时。通过引入一种新的通过共享用户注册信息和会话状态信息的解决方法来降低切换时延。在重新注册和重新建立会话请求时,并不需要所有的REGISTER和INVITE流,因为IMS服务器已经通过服务器之间的信令传输获得用户状态信息,这样能减少切换时延,在切换时信令包的数量和重建通信连接的延时方面作了理论分析,并在OPNET仿真环境下进行了检验。