WCDMA系统通信移动业务相关的管理流程

软切换
宏分集:"Macro diversity" is a operation state in which a User
Equipment simultaneously has radio links with two or more
UTRAN access points for the sole aim of improving quality of
the radio connection or providing seamless handover.
活动集:“ Active Set” Set of radio links simultaneously
involved in a specific communication service between an User
Equipment and a UTRAN access point
硬切换流程(RNC内)1. Radio Link Setup Request
2. Radio Link Setup Response
3 ALCAP ub Data Transport Bearer Setup
4. Downlink Synchronisation
5.Uplink Synchronisation
6.DCCH : Physical Channel Reconfiguration
7. Radio Link Failure Indication
8. DCCH : Physical Channel Reconfiguration Complete
9. Radio Link Deletion Request
10. Radio Link Deletion Response
11. ALCAP Iub Data Transport Bearer Release
前向切换(Forward Handover)是UE发起的切换包括CELL UPDATE和URA UPDATE过程。其中，URA UPDATE过程只用于处于URA_PCH状态的UE进行URA重选，以及检查RRC连接是否正常。
对于CELL_FACH和CELL_PCH状态的UE
小区重选
处于SA(Service Area) 定时器T305超时此定时器在广播的系统信息中定义
对于CELL_PCH和URA_PCH状态的UE
需要上传数据时(进入CELL_FACH状态)
当在PCCH上接收到寻呼消息时，发起小区更新
CELL UPDATE过程还可用来重建RLC实体不可恢复的错误(丢失连接)，以及监视RRC连接的状态。