A.无XN接口时,通过NG接口发起切换
B.XN接口故障时,通过NG接口发起切换
C.有XN接口时,但是跨AMF Region切换时,通过NG接口发起切换
D.XN切换准备失败原因是handover target not allowed,会尝试发起NG口切换
E.XN切换准备失败原因是Unknown GUAMID,会尝试发起NG口切换
A.RRCReconfiguration
B.NGAP PATH SWITCH REQ
C.MeasurementReport
D.NGAP HANDOVER REQ