5/27/2018 Intra-EnodeB Handover Between Cells -Chart

1/1

Page 1

Leg

UE Source Cell Target Cell

Detach from old cell andsynchronize to new cell

Buffer packets fromMME

L3 sig

L1/L2

User

MME/MMEs

Area Restriction Provided

1. Measurement Control

packet data packet data

UL allocation

2. Measurement Reports

DL allocation

4. Handover Command

5. Synchronization6. UL allocation + TA for UE

7. Handover Confirm

eNB

packet data

3. HO decision

packet data

Flush DL buffer, continue

delivering in transit packets

packet datapacket data

packet data packet data

Measurement Reports

Handover Command

Handover Confirm

The UE reports the

Measurement Report

message in the source cell.

The eNodeB delivers a Handover Command

message after completing cell admission control

and radio resource allocation in the target cell.

The UE accesses the target cell.

After the handover is complete,

resources of the source cell are

released.