Handoff 切换:从一个基站向另一个基站转移用户站通信之动作。硬切换的特点是，通信信道短暂中断。软切换的特点是，一个以上的基站同时与同一个用户站保持通信。
Handoff: transfer a call or data session from one channel to another, or from one BS to another, or from one MSC to another.
Handover: the process of transferring a call
Hard handover: the process needs to drop the call for a short time, e.g., GSM handover
Soft handover: MS simultaneously use multiple BS, no need to drop the call when adding new BS, e.g., CDMA system
Handoff 又称为 Handover (HO) 是所有蜂窝通信系统共有的特征。根据切换类型可以分为，硬切换，软切换，更软切换等。 硬切换用于GSM网络，软切换是CDMA 网络的特征之一。