1. **MAP Prepare Handover Req(选项A)**是源MSC(MSCS A)向目标MSC(MSCS B)发起的切换准备请求。目标MSC收到此消息后,需检查资源(包括电路)是否可用以支持切换,符合题干中“判定是否有电路重定位”的描述。2. **MAP Prepare Handover Resp(选项B)**是目标MSC对请求的响应,代表判定后的结果,并非触发判定...
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