3 Handover Request Acknowledge
9 UE Context Release
源eNB
2 Handover Request
UE
Measurement Report
Data forwarding begin
RRCConnectionReconfigurationComplete
目标eNB
8 Path Switch Request Acknowledge
4 Handover Command
7 Path Switch Request
MME
5 SN Status Transfer
RRCConnectionReconfiguration
6 RRC Connection Reconfiguration Complete
