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www.huawei.com
Copyright © 2016 Huawei Technologies Co., Ltd. All rights reserved.
LTE handover Procedure
2 Huawei Confidential
Handover Overview
• What Is Handover
– Coverage-based handovers are introduced to ensure UE service continuity due to UE location
changes and limited coverage of each cell in a wireless mobile environment.
– Handover means that a UE in connected mode moves between different cells to update the
context of the UE.
– The eNodeB delivers related configuration information through control messages. The UE
completes handover measurement and completes handovers under the control of the eNodeB,
ensuring uninterrupted communication services. The following figure shows the UE connections
before and after the handover.
3 Huawei Confidential
Handover Type
Intra-RAT
Frequency relationship:
 Intra-frequency handover
 Inter-frequency handover
Signaling Bearer Mode:
Intra-eNodeB handover
Intra-MME X2-based Handover (with X2 Interface)
Intra-MME S1-based Handover (No X2 Interface)
An inter-MME S1 interface handover is performed, and data is forwarded over the X2 interface (with the X2 interface).
Inter-MME S1 interface handover, data is forwarded over the S1 interface (X2 interface is not available).
Triggering Reason:
Coverage-based
Load-based
Frequency priority-based
Service-based
Based on uplink quality
Distance-based
Inter-RAT
4 Huawei Confidential
handover trilogy
judgement
execute
measur
ement
The UE measures the RSRP of
the serving cell and its
neighboring cells and generates
a handover event based on the
actual situation.
Is the handover condition met ?
Perform handover and
update parameters.
measurement
judgement
execute
Y
N
Assume that the measurement
object is RSRP.
5 Huawei Confidential
Page 5
Measurement configuration
• Notifies the UE of the objects to be measured, neighboring cell list, reporting mode,
and event parameters.
• When the measurement condition changes, the eNodeB notifies the UE of the new
measurement condition.
Measurement Control, normal case
UE eUTRAN
Measurement Control
6 Huawei Confidential
Measurement Gap
Page6
7 Huawei Confidential
Signaling Tracing Example - Measurement Object
• The eNodeB can create one or more measurement IDs based on measurement object and
report configurations. The IDs correspond to the measurement object IDs and report IDs.In
addition, the measurement ID is also reported when the UE sends a measurement report.
This helps the eNodeB distinguish different measurement reports.
8 Huawei Confidential
Page 8
Measurement event
9 Huawei Confidential
Page 9
Parameter Configuration (Intra-Frequency Handover)
Handover-related parameters are used to control the
difficulty of handovers,
Time for reporting measurement reports
Intra-Frequency Handover Triggering Procedure (Event A3)
Measurement quantity RSRP/RSRQ of neighboring Mn cells
Offset of the Ofn frequency
Ocn neighboring cell offset, which is configured based on neighbor
relationships.
RSRP/RSRQ of the Ms serving cell
OFS serving frequency offset
Ocs Serving Cell Offset
Hys hysteresis coefficient, which is closely related to service characteristics and
moving speed,
Reduce the probability of ping-pong handovers.
Off a3-Offset
The unit of Mn and Ms is dBm or dB. Other values are dB.
2.
A3 Measurement
Reports
3
RRC Conn. Reconf. incl.
mobilityControlinformation
4 RRC Conn. Reconf. Complete
UE
Source
eNB
Target
eNB
1.A3 Measurement Control
Handover preparation
Random access procedure
Measure RSRP/RSRQ
A3 EventTriger
Off
Ocs
Ofs
Ms
Hys
Ocn
Ofn
Mn 






10 Huawei Confidential
Page 10
Parameter Configuration (Inter-Frequency Handover)
• Inter-Frequency Handover Triggering
Process
•Event A2-triggered gap-assisted measurement
•Two GAP modes
•The period is 40 ms (default),
and the period is 80 ms.
–Event A4-triggered inter-frequency handover
•
Thresh
Hys
Ms 

Thresh
Hys
Ocn
Ofn
Mn 



11 Huawei Confidential
-11-
The intra-eNodeB cell handover procedure is simple. Because the handover source and target are in the
same eNodeB, the eNodeB makes internal decisions. During intra-eNodeB handover, the handover
preparation message is exchanged between boards in the eNodeB, and the eNodeB does not need to apply
to the core network to change the data transmission path.
UE
Source
CELL
Target
CELL
MME S-GW PDN-GW
S5
S11
S1
Handover
decision
Handover Request
Radio Resource
allocation
Handover Request ACK
RRC Reconfiguration
(Handover Command)
Handover Confirm(Synchronization,
RRC Reconfiguration Complete)
Release Resource
Radio Resource
Release
Preparation
Phase
Execution
Phase
eNodeB
Intra-eNodeB inter-cell handover(1)
12 Huawei Confidential
Intra-eNodeB inter-cell handover (2)
1. The UE reports an appropriate measurement report to trigger the eNodeB
handover.
2. The eNodeB sends a handover command to the UE, requesting the UE to
be handed over to a new cell. The message carries the following IEs;
– The most important IE in the RRC reconfiguration message is
MobilityControlInfo. If this IE exists in the message, the message is a
handover command.。
Page12
3. After receiving this IE, the UE accesses the target cell based on the
configuration carried in the message. After successful access, the
UE sends a reconfiguration complete message to the target cell,
indicating that the handover is successful.
4. After receiving the completion message of the new cell, the eNodeB
re-delivers the measurement configuration to the UE according to
the configuration of the new cell.
UE eNodeB
Measurement Reports
RRC Connection Reconfiguration (mobilityControlInfo)
RRC Connection Reconfiguration Complete
RRC Connection Reconfiguration(MeasurementControl)
RRC Connection Reconfiguration Complete
Handover
Uu Uu
13 Huawei Confidential
Inter-eNodeB X2-based handover procedure
13
14 Huawei Confidential
Inter-eNodeB inter-cell handover
1. The UE sends an appropriate measurement report to trigger the eNodeB handover.
2. sending, by a source base station, a handover request to a target base station; and;
3. After receiving the handover request message, the target eNodeB makes an admission decision. If the UE is allowed to be handed
over, the target eNodeB sends a HANDOVER REQUESTACKNOWLEDGE message to the source eNodeB, indicating that the
handover preparation is successful.
4. The source base station forwards the handover command to the UE.
5. If there is an E-RAB bearer to be forwarded, the source eNodeB starts the forwarding procedure and sends an SN Status Transfer
message.
6. The UE is handed over to the target eNodeB by changing the radio parameter configuration according to the handover command.
7. After accessing a cell of the target base station, the UE sends a reconfiguration complete message to the target base station.
8. After receiving the completion message, the target eNodeB sends a PATH SWITCH REQUEST message to the core network to
request the core network to switch the user plane path.
9. If the EPC allows the user-plane handover, it sends a PATH SWITCH REQUESTACKNOWLEDGE message to the target eNodeB.
10.After receiving the PATH SWITCH ACK message, the target eNodeB sends a UE CONTEXT RELEASE message to the source
eNodeB, indicating that the UE can be removed and the handover is successful.After receiving the message, the source
eNodeB does not release the UE immediately. Instead, the source eNodeB releases the UE locally after data forwarding is
complete.
15 Huawei Confidential
Inter-eNodeB S1-based handover procedure
15
Thank You
www.huawei.com
Copyright © 2018 Huawei Technologies Co., Ltd. All Rights Reserved.
The information in this document may contain predictive statements including, without limitation, statements regarding the future financial
and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and
developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for
reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.

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4-LTE handover procedure EMERSON EDUARDO RODRIGUES.pptx

  • 1. www.huawei.com Copyright © 2016 Huawei Technologies Co., Ltd. All rights reserved. LTE handover Procedure
  • 2. 2 Huawei Confidential Handover Overview • What Is Handover – Coverage-based handovers are introduced to ensure UE service continuity due to UE location changes and limited coverage of each cell in a wireless mobile environment. – Handover means that a UE in connected mode moves between different cells to update the context of the UE. – The eNodeB delivers related configuration information through control messages. The UE completes handover measurement and completes handovers under the control of the eNodeB, ensuring uninterrupted communication services. The following figure shows the UE connections before and after the handover.
  • 3. 3 Huawei Confidential Handover Type Intra-RAT Frequency relationship:  Intra-frequency handover  Inter-frequency handover Signaling Bearer Mode: Intra-eNodeB handover Intra-MME X2-based Handover (with X2 Interface) Intra-MME S1-based Handover (No X2 Interface) An inter-MME S1 interface handover is performed, and data is forwarded over the X2 interface (with the X2 interface). Inter-MME S1 interface handover, data is forwarded over the S1 interface (X2 interface is not available). Triggering Reason: Coverage-based Load-based Frequency priority-based Service-based Based on uplink quality Distance-based Inter-RAT
  • 4. 4 Huawei Confidential handover trilogy judgement execute measur ement The UE measures the RSRP of the serving cell and its neighboring cells and generates a handover event based on the actual situation. Is the handover condition met ? Perform handover and update parameters. measurement judgement execute Y N Assume that the measurement object is RSRP.
  • 5. 5 Huawei Confidential Page 5 Measurement configuration • Notifies the UE of the objects to be measured, neighboring cell list, reporting mode, and event parameters. • When the measurement condition changes, the eNodeB notifies the UE of the new measurement condition. Measurement Control, normal case UE eUTRAN Measurement Control
  • 7. 7 Huawei Confidential Signaling Tracing Example - Measurement Object • The eNodeB can create one or more measurement IDs based on measurement object and report configurations. The IDs correspond to the measurement object IDs and report IDs.In addition, the measurement ID is also reported when the UE sends a measurement report. This helps the eNodeB distinguish different measurement reports.
  • 8. 8 Huawei Confidential Page 8 Measurement event
  • 9. 9 Huawei Confidential Page 9 Parameter Configuration (Intra-Frequency Handover) Handover-related parameters are used to control the difficulty of handovers, Time for reporting measurement reports Intra-Frequency Handover Triggering Procedure (Event A3) Measurement quantity RSRP/RSRQ of neighboring Mn cells Offset of the Ofn frequency Ocn neighboring cell offset, which is configured based on neighbor relationships. RSRP/RSRQ of the Ms serving cell OFS serving frequency offset Ocs Serving Cell Offset Hys hysteresis coefficient, which is closely related to service characteristics and moving speed, Reduce the probability of ping-pong handovers. Off a3-Offset The unit of Mn and Ms is dBm or dB. Other values are dB. 2. A3 Measurement Reports 3 RRC Conn. Reconf. incl. mobilityControlinformation 4 RRC Conn. Reconf. Complete UE Source eNB Target eNB 1.A3 Measurement Control Handover preparation Random access procedure Measure RSRP/RSRQ A3 EventTriger Off Ocs Ofs Ms Hys Ocn Ofn Mn       
  • 10. 10 Huawei Confidential Page 10 Parameter Configuration (Inter-Frequency Handover) • Inter-Frequency Handover Triggering Process •Event A2-triggered gap-assisted measurement •Two GAP modes •The period is 40 ms (default), and the period is 80 ms. –Event A4-triggered inter-frequency handover • Thresh Hys Ms   Thresh Hys Ocn Ofn Mn    
  • 11. 11 Huawei Confidential -11- The intra-eNodeB cell handover procedure is simple. Because the handover source and target are in the same eNodeB, the eNodeB makes internal decisions. During intra-eNodeB handover, the handover preparation message is exchanged between boards in the eNodeB, and the eNodeB does not need to apply to the core network to change the data transmission path. UE Source CELL Target CELL MME S-GW PDN-GW S5 S11 S1 Handover decision Handover Request Radio Resource allocation Handover Request ACK RRC Reconfiguration (Handover Command) Handover Confirm(Synchronization, RRC Reconfiguration Complete) Release Resource Radio Resource Release Preparation Phase Execution Phase eNodeB Intra-eNodeB inter-cell handover(1)
  • 12. 12 Huawei Confidential Intra-eNodeB inter-cell handover (2) 1. The UE reports an appropriate measurement report to trigger the eNodeB handover. 2. The eNodeB sends a handover command to the UE, requesting the UE to be handed over to a new cell. The message carries the following IEs; – The most important IE in the RRC reconfiguration message is MobilityControlInfo. If this IE exists in the message, the message is a handover command.。 Page12 3. After receiving this IE, the UE accesses the target cell based on the configuration carried in the message. After successful access, the UE sends a reconfiguration complete message to the target cell, indicating that the handover is successful. 4. After receiving the completion message of the new cell, the eNodeB re-delivers the measurement configuration to the UE according to the configuration of the new cell. UE eNodeB Measurement Reports RRC Connection Reconfiguration (mobilityControlInfo) RRC Connection Reconfiguration Complete RRC Connection Reconfiguration(MeasurementControl) RRC Connection Reconfiguration Complete Handover Uu Uu
  • 13. 13 Huawei Confidential Inter-eNodeB X2-based handover procedure 13
  • 14. 14 Huawei Confidential Inter-eNodeB inter-cell handover 1. The UE sends an appropriate measurement report to trigger the eNodeB handover. 2. sending, by a source base station, a handover request to a target base station; and; 3. After receiving the handover request message, the target eNodeB makes an admission decision. If the UE is allowed to be handed over, the target eNodeB sends a HANDOVER REQUESTACKNOWLEDGE message to the source eNodeB, indicating that the handover preparation is successful. 4. The source base station forwards the handover command to the UE. 5. If there is an E-RAB bearer to be forwarded, the source eNodeB starts the forwarding procedure and sends an SN Status Transfer message. 6. The UE is handed over to the target eNodeB by changing the radio parameter configuration according to the handover command. 7. After accessing a cell of the target base station, the UE sends a reconfiguration complete message to the target base station. 8. After receiving the completion message, the target eNodeB sends a PATH SWITCH REQUEST message to the core network to request the core network to switch the user plane path. 9. If the EPC allows the user-plane handover, it sends a PATH SWITCH REQUESTACKNOWLEDGE message to the target eNodeB. 10.After receiving the PATH SWITCH ACK message, the target eNodeB sends a UE CONTEXT RELEASE message to the source eNodeB, indicating that the UE can be removed and the handover is successful.After receiving the message, the source eNodeB does not release the UE immediately. Instead, the source eNodeB releases the UE locally after data forwarding is complete.
  • 15. 15 Huawei Confidential Inter-eNodeB S1-based handover procedure 15
  • 16. Thank You www.huawei.com Copyright © 2018 Huawei Technologies Co., Ltd. All Rights Reserved. The information in this document may contain predictive statements including, without limitation, statements regarding the future financial and operating results, future product portfolio, new technology, etc. There are a number of factors that could cause actual results and developments to differ materially from those expressed or implied in the predictive statements. Therefore, such information is provided for reference purpose only and constitutes neither an offer nor an acceptance. Huawei may change the information at any time without notice.