User's Manual
Table Of Contents
- INTRODUCTION
- Purpose
- Document Content and Organization
- Conventions
- Revision History
- CHAPTER 1. Samsung LTE System Overview
- CHAPTER 2. System Overview
- CHAPTER 3. System Structure
- CHAPTER 4. Message Flow
- CHAPTER 5. Supplementary Functions and Tools
Ver.
CHAPTER 4. Message Flow
2600-00FKQFGA2
1.0
LTE Handover: X2 Based Handover
The message flow for X2 based handover procedure is illustrated below.
Figure 20. X2 Based Handover Procedure
UE
Source Indoor
Pico Cell
MME
S-GW
EPC
1) MeasurementReport
Target Indoor
Pico Cell
Downlink/Uplink data
Downlink/Uplink data
3) HANDOVER REQUEST ACKNOWLEDGE
5) SN STATUS TRANSFER
4) RRCConnection-
Reconfiguration
(mobilityControlinfo)
Data forwarding
6) Synchronization/UL allocation and timing advance
7) RRCConnectionReconfigurationComplete
Forwarded data
Uplink data
Forwarded data
Downlink data
Down/Uplink data
Down/Uplink data
Uplink data
Downlink data
8) PATH SWITCH REQUEST
9) Modify Bearer Request
End marker
End marker
10) Modify Bearer Response
11) PATH SWITCH
REQUEST
ACKNOWLEDGE
12) UE CONTEXT RELEASE
2) HANDOVER REQUEST
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