The other is that the overfull signal flux, such as management signal, registering message, especially in mobile environment, may congests communication channel and therefore lowers the quality of communication. 另一个问题是,在移动环境下,冗余的信令流量(如管理信令、注册消息,等等)大量充斥在通信信道之中,影响了真正有用数据的传输,使通信质量大大降低。