intra-enodeb handover between cells -chart
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5/27/2018 Intra-EnodeB Handover Between Cells -Chart
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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.
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