|
Msg Name |
Entities |
Comment |
|
RRC: MeasurementReport |
UE->eNB |
measConfig settled in ConnectionReconfiguration |
|
S1AP: Handover Required |
SeNB->MME |
HO UE and Target Info & Source to Target transparent container |
|
S1AP: Handover Request |
MME->TeNB |
Include E-RABs, UE security, Source to Target transparent container etc TeNB alloc resource for admitted E-RABs |
|
S1AP: Handover Request Acknowledge |
TeNB->MME |
Failed and admitted E-RABs, Target to Source transparent container included |
|
S1AP: Handover Command |
MME->SeNB |
E-RAB (forward & release) list, Target to Source Transparent container |
|
RRC: ConnectionReconfiguration |
SeNB->UE |
MobilityControlInfo included notifying UE for handover; This message includes target eNB’s config |
|
S1AP: eNB Status Transfer |
SeNB->MME |
PDCP SN receiver and transmitter status included |
|
S1AP: MME Status Transfer |
MME->TeNB |
PDCP SN receiver and transmitter status included |
|
Msg1-2 (Msg3 if contention based) |
TeNB<->UE |
RACH (done right after ConnectionReconfig received, parallel with S1AP msg exchange) |
|
RRC Connection Reconfiguration Complete |
UE-> TeNB |
Send in UL data to confirm the handover |
|
S1AP: Handover Notify |
TeNB->MME |
Notify MME UE arrived, S1 handover complete |
|
S1AP: UE Context Release Command |
MME->SeNB |
Notify source eNB to release UE context |
|
S1AP: UE Context Release Complete |
SeNB->MME |
release all related signalling and user data transport resources |
|
|
|
|
Note: Messages among MMEs and other EPC entities are ignored here