The new scheme can provide fast authentication and registration through minimizing the number of the messages exchanged between the foreign and the home networks.

• 新方案一方面通过减少认证注册过程中家乡网络与外地网络间交换的消息数量，缩短消息传输距离，从而减小了认证注册过程产生的时间延迟，实现了更快速的切换；