如题，Cause22: 太短距离切换为什么要触发这个原因的切换呢？
counter 解释为
Number of inter-cell internal or external handovers attempts, with cause 22: "too short MS-BTS distance" on a
TCH channel (in HR or FR usage). Only the outer zones of extended cells are concerned by this counter.
Trigger condition:
Whenever 44.018HANDOVER COMMAND is sent to the mobile via the BTS because of cause 22 on TCH.
This counter is incremented in the serving cell.
Note: This counter counts both inter-PLMN and intra-PLMN handover events.

意思是这个切换和 扩展小区有关？
求解释！