217591156 ZTE LTE FDD Handover Feature Guide V1 0

ZTE LTE FDD Handover Feature Guide V1.0

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ZTE LTE FDD Handover Feature Guide

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ZTE LTE FDD Handover Feature Guide

ZTE LTE FDD Handover Feature Guide Version

V1.0

Date

2013-7-14

Author 

Wang Huan Wu Hao

Reviewer 

Notes

Not open to the third party

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ZTE LTE FDD Handover Feature Guide

TABLE OF CONTENTS 1

2

INTRODUCTION INTRODUCTION ................................................................... .................................................................................................... ............................................ ........... 2 1.1

SCOPE.................................................................................. ..................................................................................................................... ................................... 2

1.2

TARGET GROUP ......................................................................................... .................................................................................................... ........... 2

1.3

FEATURE ATTRIBUTE ................................................................................ ........................................................................................... ........... 2

1.4

CORRELATION CORRELATION W ITH OTHER FEATURE ....................................... ............................................................. ...................... 2

TERMINOLOGY TERMINOLOGY .................................................................... ..................................................................................................... ............................................ ........... 3 2.1

3

4

SPECIFICATION SPECIFICATION NOTATIONS ............................................................................... ............................................................................... 3

TECHNICAL DESCRIPTIONS .................................................. .................................................................................... ........................................ ...... 4 3.1

FEATURE DESCRIPTIONS DESCRIPTIONS .................................................................................... .................................................................................... 4

3.2

TECHNICAL DETAILS .................................... ....................................................................... ......................................................... ...................... 4

3.2.1

Measurement Configuration .................................................................. ................................................................................. ............... 4

3.2.2

Measurement Decision for f or Intra-Fr equency Handover ........................................ 8

3.2.3

Measurement Decision for f or Inter-Fr equency Handover ........................................ 9

3.2.4

Handover Decision from LTE to UTRAN ............................................................. 9

3.2.5

Handover Decision fr from om LTE to GERAN ........................................................... ........................................................... 10

3.2.6

CSFB from LTE to Other RATs ............................................................. .......................................................................... ............. 10

3.2.7

Intra-Site Handover ............................................................................................ ............................................................................................ 10

3.2.8

X2 Handover ...................................................................................................... ...................................................................................................... 11

3.2.9

Intra-RAT S1 Handover ........................................................... ...................................................................................... ........................... 13

3.2.10

Inter-RAT Handover ........................................................................................... ........................................................................................... 14

3.2.11

Redirection ......................................................................................................... 15

KEY PARAMETER PARAMETER CONFIGURATION CONFIGURATION ....................................................................... .......................................................................... ... 19 4.1

PARAMETER PARAMETER LIST ....................................................................................... ................................................................................................ ......... 19

4.2

PARAMETER PARAMETER CONFIGURATION CONFIGURATION RULE............................................................... ............................................................... 20

4.3

PARAMETER PARAMETER CONFIGURATION CONFIGURATION PROCEDURE PROCEDURE ................................................. ................................................. 28

4.3.1

Pre-Defined Parameters Configuration ............................................................ .............................................................. .. 28

4.3.2

 Activate Feature ........................................................... ................................................................................................. ...................................... 30

4.3.3

Other Parameter Param eter Configuration Procedure Proce dure ........................................................ ........................................................ 37

4.3.4

Deactivate Feature ............................................................................................. ............................................................................................. 38

4.3.5

Data Save Sa ve and Synchronization ............................................................ ......................................................................... ............. 39

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ZTE LTE FDD Handover Feature Guide

6

5.2

RELATED KPI ................................................................... ..................................................................................................... ..................................... ... 49

5.3

RELATED ALARMS ........................................ ........................................................................... ....................................................... .................... 50

错误！未定义书签。 GLOSSARY GLOSSARY .............................................................. ......................................................................................... ...........................

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ZTE LTE FDD Handover Feature Guide

FIGURES Figure 3-3-1

Intra-Frequency Handover Based on Coverage ......................................... 8

Figure 4-1

Adding the Cell ................................................................... ............................................................................................. .......................... 28

Figure 4-2

Cell Parameter Configuration ................................................................... ....................................................................... .... 29

Figure 4-3

Automatic Neighbor Cell Configuration Tool .............................................. 29

Figure 4-4

Neighbor Cell Relation Parameter Configuration ......................................... 30

Figure 4-5

Measurement Event Configuration............................................................... 31

Figure 4-6

Inter-Frequency Number and Configuration ............................................... 31

Figure 4-7

X2 SCTP Configuration .............................................................. ................................................................................ .................. 32

Figure 4-8

X2AP Configuration ..................................................................... .................................................................................... ............... 33

Figure 4-9

Disabling X2 ......................................................... ................................................................................................. ........................................ 33

Figure 4-10

UTRAN-FDD Neighbor Cell Configuration ............................................... 34

Figure 4-11

UTRAN-FDD Neighbor Cell Relation Configuration................................... 34

Figure 4-12

UTRAN Frequency Number and Parameters ............................................ 35

Figure 4-13

UTRAN-FDD Neighbor Cell Relation Configuration................................... 36

Figure 4-14

RAT Priority Configuration ..................................................................... ......................................................................... .... 36

Figure 4-15

Redirection Switch Configuration ........................................................... ............................................................... .... 37

Figure 4-16

Event Index Related to Measurement Events .......................................... 38

Figure 4-17

Parameter Configuration of Measurement Index ....................................... 38

Figure 4-18

Deactivating Handover ........................................................... ............................................................................. .................. 39

TABLES Table 4-1

Handover Related Parameter List ........................................................... ............................................................... .... 19

Table 4-2

Parameter rule of parameters .................................................................. ...................................................................... .... 20

Table 5-1

Related Counters .......................................................... ....................................................................................... ............................. 39

Table 5-2

Related KPI ...................................................................... ................................................................................................ .......................... 49

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ZTE LTE FDD Handover Feature Guide

1 Introduction 1.1

Scope This document describes FDD handover feature or technology within the eNodeB in LTE network. The main contents comprise the following: technical description, key parameters and configuration, related counters, KPI statistics and alarms.

1.2

Target Group This document is intended for:

1.3



Engineering personnel and technicians



Maintenance engineers

Feature Attribute GUL: V4.12.10.15P40 EMS: U31 V12.12.43P02 OMMB: V12.12.40P26 eNodeB: V3.10.20P02

Involved NEs:

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ZTE LTE FDD Handover Feature Guide

2 Terminology 2.1

Specification Notations  



Procedure When referring to an elementary procedure in the specification the Procedure Name is written with the first letters in each word in upper case

characters followed by the word “procedure” , e.g., Random Access procedure.  



Message When referring to a message in the specification the MESSAGE NAME is written with all letters in upper case characters followed by the word

“message”, e.g., The MME initiates the procedure by sending an E-RAB SETUP REQUEST message to the eNodeB.  



Parameter

When referring to a parameter in the specification the parameter is written in Italic font, e.g., Band indicator of target ARFCN should be configured by byEutranFDDTarBand  for  for LTE. 

IE When referring to an information element (IE) in the specification the Information Element Name  Name   is written with the first letters in each word in upper case characters and all letters in Italic font followed by the

abbreviation “IE”, e.g., Information Element IE.

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ZTE LTE FDD Handover Feature Guide

3 Technical Descriptions 3.1

Feature Descriptions In LTE, UE mobility m obility in RRC_CONNECTED RRC_CONNECTED state is realized by handover and redirection. In terms of Radio Access Technology (RAT), the handover can be divided into intra-RAT handover and inter-RAT handover (including UTRAN and GERAN). In terms of different frequency during the handover procedure, the intra-RAT handover can be divided into intra-frequency handover and inter-frequency handover. This document describes the measurement configuration, handover decision, and handover execution procedures.

3.2

Technical Details

3.2.1 Measurement Configuration  After the UE initially initially accesses or or hands over into a cell, or the eNB eNB receives a measurement report from the UE, the eNB sends measurement measurement configuration to the UE through an RRC CONNECTI C ONNECTION ON RECONFIGURATION RECONFIGURATION message. Measurement configuration configuration related to handover will be sent to the UE in the following five scenarios: 1.

Only intra-frequency intra-frequency neighbor cells a)

When the UE initially accesses a cell, the eNodeB eNodeB sends the measurement measurement configuration (A3 or A5 event) for intra-frequency intra-frequency handover to the UE. If the redirection function is

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ZTE LTE FDD Handover Feature Guide

a)

When the UE initially accesses a cell, the eNodeB eNodeB sends the the  A2 measurement measurement event for for opening inter-frequency inter-frequency measurement to the UE.

b)

After the eNodeB eNodeB receives the A2 measurement report used for opening inter-frequency measurement, it sends the A3 or A5 measurement event used for inter-frequency handover to the UE, and opens a gap. The eNodeB sends the A1 measurement event used for closing inter-frequency measurement measurement to the UE, and deletes the A2 measurement event used for staring inter-frequency inter-frequency measurement. If the redirection function is enabled and there are available frequencies for redirection, the eNodeB sends the A2 measurement measurement event used for redirection to the UE. Go to the next step.

c)

If the the eNodeB eNodeB receives the inter-frequency inter-frequency measurement measurement report, report, it makes the handover decision and executes handover. If no measurement measurement report is received, go to the next step.

d)

If the eNodeB receives the A2 A2 measurement measurement report used for redirection, it performs the blind redirection based on the procedure described in 3.2.11 in 3.2.11 Redirection. If no measurement report is received, go to the next step.

e)

After the eNodeB eNodeB receives the A1 measurement measurement report, it deletes the A1 measurement measurement configuration, closes the gap, and deletes the measurement configuration used for inter-frequency inter-frequency handover. If there is A2 measurement configuration configuration used for redirection, the eNodeB deletes the configuration configuration and sends the A2 measurement event used for f or staring inter-frequency inter-frequency measurement to the UE, which means returning to state a).

3.

Only inter-RAT neighbor neighbor cells: a)

When UE initially initially accesses accesses a cell, the eNodeB sends the A2

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ZTE LTE FDD Handover Feature Guide

c)

If the the eNodeB eNodeB receives the inter-RAT measurement measurement report, it makes the handover decision and executes handover. If no measurement measurement report is received, go to the next step.

d)

If the eNodeB receives the A2 A2 measurement measurement report used for redirection, it performs the blind redirection based on the procedure described in 3.2.11 in 3.2.11 Redirection. If no measurement report is received, go to the next step.

e)

If the eNodeB receives the A1 A1 measurement measurement report, it deletes deletes the A1 measurement configuration, closes the gap, and deletes the measurement configuration used for inter-RAT handover. If there is A2 measurement measurement configuration used for redirection, the eNodeB deletes the configuration and sends the A2 measurement measurement event used for staring inter-RAT measurement to the UE, which means returning to state a).

4.

Both inter-frequency inter-frequency and inter-RAT neighbor cells exist, and interFandInterR interFandInterR is set to 0 (both inter-freque i nter-frequency ncy and inter-RAT measurement commands commands are sent): a)

When UE initially initially accesses a cell, cell, the eNodeB sends the higher one of the thresholds of A2 measurements used for starting inter-frequency inter-frequency or inter-RAT measurements measurements to the UE. This measurement event is called i nitial A2 measurement event.

b)

After the eNodeB receives the initial initial A2 measurement measurement report, report, it sends the measurement configuration (A3 or A5 event) used for inter-frequency handover and measurement measurement configuration (B2 or B1 event) used for inter-RAT handover to the UE. The eNodeB opens a gap, sends the A1 measurement event used for stopping inter-frequency/RAT inter-frequency/RAT measurement to the UE, and deletes the initial A2 measurement measurement event. If the redirection function is enabled and there are available frequencies, the eNodeB sends the A2 measurement measurement event used for redirection

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ZTE LTE FDD Handover Feature Guide

procedure described in 3.2.11 in 3.2.11 Redirection. If no measurement report is received, go to the next step. f)

After the eNodeB receives the A1 measurement measurement report, it deletes the A1 measurement measurement configuration, closes the gap, and deletes the measurement configuration used for inter-frequency and inter-RAT handovers. If there is A2 measurement measurement configuration used for f or redirection, the eNodeB deletes the configuration and sends the initial A2 measurement measurement event to the UE, which means returning to state a).

5.

Both inter-frequency inter-frequency and inter-RAT neighbor cells exist, and interFandInterR interFandInterR is set to 1 (inter-frequency measurement measurement event is sent to the UE before inter-RAT measurement measurement event): a)

When the UE initially accesses a cell, the eNodeB eNodeB sends the the  A2 measurement measurement event for staring inter-frequency inter-frequency measurement to the UE.

b)

After the eNodeB eNodeB receives the A2 measurement measurement report, it sends the measurement configuration (A3 or A5 event) used for inter-frequency handover handover to the UE. The eNodeB deletes the A2 measurement event used for staring inter-frequency measurement, and sends the A2 measurement configuration (B2 or B1 event) used for f or starting inter-RAT measurement measurement to the UE. The eNodeB opens a gap, and sends the A1 measurement event used for stopping inter-frequency and

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ZTE LTE FDD Handover Feature Guide

configuration configuration used for redirection to the UE. Go to the next step. f)

If the eNodeB receives the inter-RAT measurement measurement report, it makes the handover decision and executes handover. If no measurement measurement report is received, go to the next step.

g)

If the eNodeB receives the A2 A2 measurement measurement report used for redirection, it performs the blind redirection based on the procedure described in 3.2.11 in 3.2.11 Redirection. If no measurement report is received, go to the next step.

h)

If the eNodeB receives the A1 A1 measurement measurement report, it deletes deletes the A1 measurement configuration, closes the gap, and deletes the measurement configuration used for inter-frequency inter-frequency and inter-RAT handovers. handovers. If there is A2 measurement configuration configuration used for redirection, the eNodeB deletes the configuration and sends the A2 measurement event used for starting inter-frequency inter-frequency handover to the UE, which means returning to state a).

3.2.2 Measurement Decision for Intra-Frequency Handover Figure 3-3-1

Intra-Frequency Handover Based

Coverage

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ZTE LTE FDD Handover Feature Guide

3.2.3 Measurement Decision for Inter-Frequency Handover Figure 3-2 Inter-Frequency Handover Based on Coverage

Cell A Freq 1

Cell B Freq 2

If the frequency used in the source cell and the frequency used in the target cell are different, the handover is called inter-frequency inter-frequency handover. When the eNodeB receives the measurement report used for inter-frequency handover, If the UE supports inter-frequency handover (FG bit 13), the eNodeB selects the handover target cell from the neighbor cell list in the measurement report.

The target neighbor cell must meet the following requirements: requirements: 1) The neighbor cell supports handover. 2) The neighbor cell supports RRC_CONNECTED state. If there are multiple neighboring cells that meet the above requirements, requirements, the eNodeB sorts them based on the signal strength and initiates inter-frequency inter-frequency handovers to the cells in sequence.

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ZTE LTE FDD Handover Feature Guide

If there are candidate cells that support PS HO, the eNodeB sorts the cells based on channel quality, and initiates inter-RAT handovers from the LTE cell to the UTRAN cells in sequence.

3.2.5 Handover Decision from LTE to GERAN GERAN  After the eNodeB eNodeB receives the measurement measurement report about about GERAN neighbor cells, it makes handover decision based on the UE capability and neighbor cell configuration. configuration. To perform CCO, the following requirements must be met: 1) The UE supports supports CCO (FG (FG bit 10). 10). If there are candidate cells that support CCO, the eNodeB sorts the cells based on channel quality, and initiates inter-RAT handovers from the LTE cell to the GERAN cells in sequence. Note: PS HO from LTE to GERAN is not supported in the current version.

3.2.6 CSFB from LTE to Other RATs In the initial deployment deployment phase of LTE, the core network is not equipped with IMS, and the LTE network cannot provide voice services. In this case, voice services can be directed to other RATs by CS fallback. When W hen the

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ZTE LTE FDD Handover Feature Guide

Figure 3-3 Intra-Site Handover

Source Cell

UE

Target cell

 RRcConnectionReconfiguration

Random Access Procedure

 RRcConnectionReconfigurationComplete

The intra-site handover procedure is described as follows: 1) The source source cell cell sends sends an RRC CONNECTION CONNECTION RECONFIGURATION RECONFIGURATION message (containing mobilityControlInfo IE) to the UE, instructing the UE to access the target cell. 2) The UE initiates random random access access to the the target cell. 3) When the UE accesses the target target cell, it sends an RRC CONNECTION RECONFIGURATION COMPLETE message to the target cell to confirm that the handover is successful.

3.2.8 X2 Handover

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ZTE LTE FDD Handover Feature Guide

2) The target eNodeB prepares for handover at Layer 1 and layer layer 2, establishes the user-plane path for data forwarding, and sends a HANDOVER REQUEST ACKNOWLEDGE message to the source eNodeB. If data forwarding is required, a path for uplink data forwarding and a path for downlink data forwarding are established for each E-RAB. The HANDOVER REQUEST ACKNOWLEDGE message contains a container, which contains an RRC CONNECTION RECONFIGURATION message with MobilityControlInfo IE contained in the message. 3) The source eNodeB eNodeB sends an RRC CONNECTION RECONFIGURATION message (containing MobilityControlInfo IE) to the UE, instructing the UE to access to the target eNodeB. 4) The source eNodeB sends an SN STATUS TRANSFER message to the target eNodeB, to transmit the uplink PDCP SN receiving status and downlink PDCP SN transmitting status of each E-RAB. 5) The source eNodeB establishes the the user-plane user-plane path for data

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ZTE LTE FDD Handover Feature Guide

3.2.9 Intra-RAT S1 Handover Figure 3-5 Intra-RAT S1 Handover

UE

Target eNodeB

Source eNodeB

MME/S-GW

HandoverRequired  HandoverRequest  HandoverRequestAcknowledge RRcConnectionReconfiguration

HandoverCommand 

eNBStatusTransfer  MMEStatusTransfer 

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ZTE LTE FDD Handover Feature Guide

eNodeB. If the source eNodeB uses indirect path for data forwarding, the MME and SGW prepare the user-plane path for data forwarding. 5) The source eNodeB eNodeB sends an RRC CONNECTION RECONFIGURATION RECONFIGURATION message to the UE, and informs the UE to move to the target cell. 6) The source eNodeB sends eNodeB a STATUS TRANSFER message to the MME, with the uplink PDCP SN receiving status and downlink PDCP SN transmitting status of each E-RAB. 7) The MME sends an MME STATUS TRANSFER message to the target eNodeB. 8) The source eNodeB starts data forwarding forwarding on the direct direct path or indirect path determined before. 9) The UE initiates random random access access to the the target cell. 10) When the UE accesses the target cell, it sends an RRC

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ZTE LTE FDD Handover Feature Guide

Figure 3-6 Inter-RAT Handover

UE

eNB

MME

 MeasurementRepor  MeasurementReport  t   HandoverRequir  HandoverRequired  ed 

 HandoverComm  HandoverCommand  and   MobilityFromEu  MobilityFromEutraComm traCommand  and  UeContextReleaseCommand  UeContextReleaseComplete

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ZTE LTE FDD Handover Feature Guide

Figure 3-7 Blind Redirection

UE

eNodeB

MEASUREMENT REPORT (A2 measurement report for redirection)

MME

UE CONTEXT RELEASE REQUEST UE CONTEXT RELEASE COMMAND UE CONTEXT RELEASE COMPLETE

RRCCONNECTION RRCCONNECTION RELEASE

 After the eNodeB eNodeB receives the A2 measurement measurement report used for blind

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ZTE LTE FDD Handover Feature Guide

Figure 3-8 Inter-Frequency Redirection Based on Measurements UE

eNodeB

MME

MEASUREMENT REPORT (Measurement report for inter-frequency handover)

UE CONTEXT RELEASE REQUEST UE CONTEXT RELEASE COMMAND

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ZTE LTE FDD Handover Feature Guide

Figure 3-9 Inter-RAT Redirection Based on Measurements UE

eNodeB

MME

MEASUREMENT REPORT (Measurement report for inter-RAT handover)

UE CONTEXT RELEASE REQUEST UE CONTEXT RELEASE COMMAND

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ZTE LTE FDD Handover Feature Guide

4 Key Parameter Configuration 4.1

Parameter List Table 4-1

Handover Related Parameter List

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ZTE LTE FDD Handover Feature Guide

4.2

25

Handover support

Figure 4-11

26

UTRAN-frequency number

Figure 4-12

27

RAT priority

Figure 4-14

28

Redirection algorithm for coverage

Figure 4-15

Parameter Configuration Rule

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ZTE LTE FDD Handover Feature Guide

2

1:1920-1980, 2:1850-1910, 3:1710-1785, 4:1710-1755, 5:824-849, 7:2500-2570, 8:880-915, The parameter

9:1749.9-1784.9,

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ZTE LTE FDD Handover Feature Guide

Open

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ZTE LTE FDD Handover Feature Guide

11

freqBandInd==1[2110-2170],

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