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

Version Date Author Reviewer Notes

V1.0 2013-7-14 Wang Huan

Wu Hao Not open to the third party



TABLE OF CONTENTS

1 INTRODUCTION ............................................................................................................... 2

1.1 SCOPE ..................................................................................................................... 2

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

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

1.4 CORRELATION WITH OTHER FEATURE ............................................................. 2

2 TERMINOLOGY ................................................................................................................ 3

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

3 TECHNICAL DESCRIPTIONS .......................................................................................... 4

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

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

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

3.2.2 Measurement Decision for Intra-Frequency Handover ........................................ 8

3.2.3 Measurement Decision for Inter-Frequency Handover ........................................ 9

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

3.2.5 Handover Decision from 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

4 KEY PARAMETER CONFIGURATION .......................................................................... 19

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

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

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

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

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

4.3.3 Other Parameter Configuration Procedure ........................................................ 37

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

4.3.5 Data Save and Synchronization ......................................................................... 39

5 RELATED COUNTERS, KPI AND ALARMS ................................................................. 39

5.1 RELATED COUNTERS ......................................................................................... 39



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

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

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



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



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:

Engineering personnel and technicians

Maintenance engineers

1.3 Feature Attribute

GUL: V4.12.10.15P40

EMS: U31 V12.12.43P02

OMMB: V12.12.40P26

eNodeB: V3.10.20P02

Involved NEs:

UE eNodeB MME S-GW BSC/RNC SGSN P-GW HSS

√ √ √ - - - - -

Note:

*-: Not involved

*√: involved

1.4 Correlation with Other Feature

No



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 LTE.

IE

When referring to an information element (IE) in the specification the

Information Element 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.

Value of an IE

When referring to the value of an information element (IE) in the

specification the “Value” is written as it is specified enclosed by quotation

marks, e.g., This IE shall be present if the Handover Type IE is set to the

value “LTEtoGERAN” and the SRVCC HO Indication IE is present.



3 Technical Descriptions

3.1 Feature Descriptions

In LTE, UE mobility in 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 accesses or hands over into a cell, or the eNB

receives a measurement report from the UE, the eNB sends measurement

configuration to the UE through an RRC CONNECTION

RECONFIGURATION message.

Measurement configuration related to handover will be sent to the UE in

the following five scenarios:

1. Only intra-frequency neighbor cells

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

measurement configuration (A3 or A5 event) for

intra-frequency handover to the UE. If the redirection function is

enabled and there are available inter-frequency or inter-RAT

frequencies, the A2 measurement event used for redirection is

also sent to the UE.

b) If the eNodeB receives the intra-frequency measurement report,

it makes the handover decision and executes handover. If no

measurement report is received, go to the next step.

c) If the eNodeB receives the A2 measurement report used for

redirection, it performs the blind redirection based on the

procedure described in 3.2.11 Redirection.

2. Only inter-frequency neighbor cells




A2 measurement event for opening inter-frequency

measurement to the UE.

b) After the 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 to the UE,

and deletes the A2 measurement event used for staring

inter-frequency measurement. If the redirection function is

enabled and there are available frequencies for redirection, the

eNodeB sends the A2 measurement event used for redirection

to the UE. Go to the next step.

c) If the eNodeB receives the inter-frequency measurement report,



d) If the eNodeB receives the A2 measurement report used for


procedure described in 3.2.11 Redirection. If no measurement

report is received, go to the next step.

e) After the eNodeB receives the A1 measurement report, it

deletes the A1 measurement configuration, closes the gap, and

deletes the measurement configuration used for

inter-frequency handover. If there is A2 measurement

configuration used for redirection, the eNodeB deletes the

configuration and sends the A2 measurement event used for

staring inter-frequency measurement to the UE, which means

returning to state a).

3. Only inter-RAT neighbor cells:

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

measurement event for staring inter-RAT measurement to the

UE.

b) After the eNodeB receives the A2 measurement report used for

opening inter-RAT measurement, it sends the measurement

configuration (B2 or B1 event) used for inter-RAT handover to

UE, and opens a gap. The eNodeB sends the A1 measurement

event used for stopping inter-RAT measurement, and deletes

the A2 measurement event used for staring inter-RAT

measurement. If the redirection function is enabled and there

are available frequencies, the eNodeB sends the A2

measurement event used for redirection to the UE.



c) If the eNodeB receives the inter-RAT measurement report, it

makes the handover decision and executes handover. If no


d) If the eNodeB receives the A2 measurement report used for




e) If the eNodeB receives the A1 measurement report, it deletes

the A1 measurement configuration, closes the gap, and deletes

the measurement configuration used for inter-RAT handover. If

there is A2 measurement configuration used for redirection, the

eNodeB deletes the configuration and sends the A2

measurement event used for staring inter-RAT measurement

to the UE, which means returning to state a).

4. Both inter-frequency and inter-RAT neighbor cells exist, and

interFandInterR is set to 0 (both inter-frequency and inter-RAT

measurement commands are sent):

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

higher one of the thresholds of A2 measurements used for

starting inter-frequency or inter-RAT measurements to the UE.

This measurement event is called initial A2 measurement

event.

b) After the eNodeB receives the initial A2 measurement report, it

sends the measurement configuration (A3 or A5 event) used

for inter-frequency handover and 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 measurement to the UE, and

deletes the initial A2 measurement event. If the redirection

function is enabled and there are available frequencies, the

eNodeB sends the A2 measurement event used for redirection

to the UE. Go to the next step.




d) If the eNodeB receives the inter-RAT measurement report, it



e) If the eNodeB receives the A2 measurement report used for






f) After the eNodeB receives the A1 measurement report, it

deletes the A1 measurement configuration, closes the gap, and

deletes the measurement configuration used for

inter-frequency and inter-RAT handovers. If there is A2

measurement configuration used for redirection, the eNodeB

deletes the configuration and sends the initial A2 measurement

event to the UE, which means returning to state a).

5. Both inter-frequency and inter-RAT neighbor cells exist, and

interFandInterR is set to 1 (inter-frequency measurement event is

sent to the UE before inter-RAT measurement event):


A2 measurement event for staring inter-frequency

measurement to the UE.

b) After the eNodeB receives the A2 measurement report, it

sends the measurement configuration (A3 or A5 event) used

for inter-frequency 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 starting inter-RAT measurement to

the UE. The eNodeB opens a gap, and sends the A1

measurement event used for stopping inter-frequency and

inter-RAT measurement to the UE. Go to the next step.




d) If the eNodeB receives the A1 measurement report, it deletes

the measurement configuration used for inter-frequency

handover. The eNodeB deletes the A2 measurement event

used for staring inter-RAT measurement, and sends the A2

measurement event used for starting inter-frequency

measurement to the UE, which means returning to state a). If

no measurement report is received, go to the next step.

e) If the eNodeB receives the A2 measurement report used for

starting inter-RAT measurement, it sends the measurement

configuration (B2 or B1 event) used for inter-RAT handover to

the UE. The eNodeB deletes the A2 measurement

configuration used for starting inter-RAT measurement. If the

redirection function is enabled and there are available

frequencies, the eNodeB sends the A2 measurement



configuration used for redirection to the UE. Go to the next

step.

f) If the eNodeB receives the inter-RAT measurement report, it



g) If the eNodeB receives the A2 measurement report used for




h) If the eNodeB receives the A1 measurement report, it deletes

the A1 measurement configuration, closes the gap, and deletes

the measurement configuration used for inter-frequency and

inter-RAT handovers. If there is A2 measurement configuration

used for redirection, the eNodeB deletes the configuration and

sends the A2 measurement event used for starting

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 on Coverage

Cell A

Freq 1

Cell B

Freq 1

If the frequency used in the source cell and the frequency used in the

target cell are the same, the handover is called intra-frequency handover.

When the eNodeB receives the measurement report used for intra-frequency

handover, it selects the handover target cell from the neighbor cell list in the

measurement report.

The target neighbor cell must meet the following 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,

the eNodeB sorts them based on the signal strength and initiates

intra-frequency handovers to the cells in sequence.



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 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:

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,

the eNodeB sorts them based on the signal strength and initiates

inter-frequency handovers to the cells in sequence.

Note: If the handover is an intra-LTE inter-mode inter-frequency handover (the

serving cell belongs to LTE FDD, and the neighbor cell in the measurement

report belongs to TD LTE), for R8 terminals, only FG bit 13 is used to determine

whether the UE supports inter-frequency handover, while for R9 or later

terminals, FG bit 30 is also used to determine whether the UE supports

inter-frequency handover.

3.2.4 Handover Decision from LTE to UTRAN

After the eNodeB receives the measurement report about UTRAN

neighboring cells, it makes handover decision based on the UE capability

and neighbor cell configuration. To perform PS HO, the following

requirements must be met:

1) The UE supports UTRAN PS Handover (FG bit 8).

2) UTRAN supports PS handover.

3) The neighbor relation supports handover.



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

After the eNodeB receives the measurement report about GERAN

neighbor cells, it makes handover decision based on the UE capability and

neighbor cell configuration.

To perform CCO, the following requirements must be met:

1) The UE supports CCO (FG bit 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 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 the

eNodeB receives MME INITIAL CONTEXT SETUP REQUEST message or

UE CONTEXT MODIFICATION REQUEST message, and CS Fallback

Indicator IE is contained, it starts the CSFB procedure. There are two CSFB

modes: blind CSFB and CSFB based on measurements.

1) CSFB from LTE to UTRAN

When the UE initiates the voice service, LTE moves the UE to UTRAN

by PS HO or Redirection. The voice service is provided by UTRAN.

2) CSFB from LTE to GERAN

When the UE initiates the voice service, LTE moves the UE to GERAN

by PS HO, CCO, or Redirection. The voice service is provided by GERAN.

For more details, refer to the documents related to CSFB.

3.2.7 Intra-Site Handover

When the source cell and target cell involved in a handover are in the

same eNodeB, the handover is called intra-site handover.



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 cell sends an RRC CONNECTION

RECONFIGURATION message (containing mobilityControlInfo IE)

to the UE, instructing the UE to access the target cell.

2) The UE initiates random access to the target cell.

3) When the UE accesses the 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

Figure 3-4 X2 Handover

UETarget

eNodeB

Source

eNodeB




MME/S-GW

HandoverRequest

HandoverRequestAcknowledge

SNStatusTransfer

PathSwitchRequest

PathSwitchRequestAcknowledge

Data Forwarding

The X2 handover procedure is described as follows:

1) The source eNodeB sends a HANDOVER REQUEST message to

the target eNodeB, including necessary information for handover.



2) The target eNodeB prepares for handover at Layer 1 and 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 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 user-plane path for data

forwarding, and transmits user data to the target eNodeB.

6) The UE performs downlink synchronization and random access to

the target cell.

7) After the UE accesses the target cell, it sends an RRC


target cell to confirm the handover is successful.

8) The target eNodeB sends a PATH SWITCH message to the MME,

and inform the MME that the UE has changed its serving cell.

9) After the MME receives the PATH SWITCH message, it sends the

PATH SWITCH ACKNOWLEDGE message to the target eNodeB.

10) The X2 handover procedure ends.



3.2.9 Intra-RAT S1 Handover

Figure 3-5 Intra-RAT S1 Handover

The S1 handover procedure is described as follows:

1) The source eNodeB sends a HANDOVER REQUIRED message to

the MME, instructing whether data forwarding is required (indicated

by DL Forwarding IE) for each E-RAB and whether the direct

forwarding path from the source eNodeB to target eNodeB is

available (indicated by Direct Forwarding Path Availability IE).

2) The MME sends a HANDOVER REQUEST message to the target

eNodeB. The target eNodeB establishes the UE context after

receiving the message.

3) The target eNodeB prepares for handover with Layer 1 and layer 2,

establishes the user-plane path for data forwarding, and sends a

HANDOVER REQUEST ACKNOWLEDGE message to the MME.

The RRC message used for handover is contained in Target to

Source Transparent Container IE of this message.

4) The MME sends a HANDOVER COMMAND message to the source

eNodeB. Bearers Subject to Forwarding IE of this message contains

the address list and TEID for data forwarding allocated by the target

UETarget

eNodeB

Source

eNodeB




MME/S-GW

HandoverRequired

HandoverRequestAcknowledge

eNBStatusTransfer

HandoverNotify

UeContextReleaseCommand

Only for Direct Data Forwarding

HandoverRequest

HandoverCommand

MMEStatusTransfer

Only for Indirect Data Forwarding

UeContextReleaseComplete



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 sends an RRC CONNECTION

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 on the direct path or

indirect path determined before.

9) The UE initiates random access to the target cell.

10) When the UE accesses the target cell, it sends an RRC


target cell to confirm that the handover is successful.

11) The target eNodeB sends a HANDOVER NOTIFY message to the

MME to confirm the UE successfully accesses the target eNodeB.

12) The MME sends a UE CONTEXT RELEASE COMMAND message

to the source eNodeB.

13) The source eNodeB releases the UE related resources, and sends a

UE CONTEXT RELEASE COMPLETE message to the MME.

14) The S1 handover procedure ends.

3.2.10 Inter-RAT Handover

E-UTRAN sends a MOBILITY FROM EUTRA COMMAND message

(with Handover or CellChangeOrder IE) to the UE in RRC_CONNECTED

state, and indicates the UE to perform PS HO to UTRAN or perform PS HO

or CCO to GERAN.



Figure 3-6 Inter-RAT Handover

The inter-RAT handover procedure is described as follows:

1) The eNodeB sends a HandoverRequired message to the MME, and

the MME interacts with the target RAT. The target RAT establishes

the UE context.

2) After MME interacts with the target RAT, it sends a Handover

Command message to the eNodeB.

3) The eNodeB sends a MobilityFromEutraCommand message to the

UE, and the UE performs random access to the inter-RAT system

cell.

4) After the UE successfully accesses the target cell, the MME informs

the source eNodeB to release the UE context.

3.2.11 Redirection

The mobility in RRC_CONNECTED state is realized by PS HO, CCO,

and Redirection. The priority based on time delay:

PS HO > CCO > Redirection

When PS handover and CCO are not supported, the eNodeB indicates

the UE to perform redirection by redirectedCarrierInfo IE in the RRC

CONNECTION RELEASE message.

There are two redirection types: blind redirection and redirection based

on measurements.

1. Blind Redirection:

UE eNB MME

MeasurementReport

HandoverRequired

HandoverCommand

MobilityFromEutraCommand

UeContextReleaseCommand

UeContextReleaseComplete



Figure 3-7 Blind Redirection

After the eNodeB receives the A2 measurement report used for blind

redirection, it makes the redirection decision.

1) The eNodeB selects the highest priority RAT that the UE

supports in RAT priorities (ratPriorityPara), and go to the next

step.

2) The eNodeB selects the highest priority (non zero) frequency

that the UE supports as the target frequency. If there are

available frequencies, go to step 4. If there are no available

frequencies, go to the next step.

3) If there are no available frequencies in the target RAT, the

eNodeB selects the second highest priority RAT that UE

supports as the target RAT. Return to 2).

4) The eNodeB sends the selected frequencies to the UE.

2. Redirection based on measurements:

UE CONTEXT RELEASE COMPLETE

eNodeB

UE CONTEXT RELEASE COMMAND

MME

UE CONTEXT RELEASE REQUEST

UE

MEASUREMENT REPORT

RRCC ONNECTION RELEASE

(A2 measurement report

for redirection)



Figure 3-8 Inter-Frequency Redirection Based on Measurements

1) Inter-frequency Redirection:

After the eNodeB receives the measurement report used

for inter-frequency handover, it indicates the UE to perform

redirection to the frequency in the measurement report when

the following requirements are met:

a) The UE does not support inter-frequency handover, or (and)

the neighboring cell does not support handover, or

b) Only unknown PCIs are contained in the measurement

report, or

c) Unknown PCIs are contained in the measurement report,

and all known PCIs have failed for handover, and

d) No cell in the measurement report is in the handover limit

list.

2) Inter-RAT Redirection:


eNodeB


MME


UE

MEASUREMENT REPORT


(Measurement report for

inter-frequency handover)



Figure 3-9 Inter-RAT Redirection Based on Measurements

After the eNodeB receives the measurement report used

for inter-RAT handover, it indicates the UE to perform

redirection to the RART and frequency in the measurement

report when the following requirements are met:

a) The UE does not support inter-RAT handover, or (and) the

neighboring cell does not support handover, and

b) When the RAT in the measurement report is GERAN, and

the UE does not support CCO, or

c) Only unknown PCIs are contained in the measurement

report, or

d) Unknown PCIs are contained in the measurement report,

and all known PCIs have failed for handover, and

After the UE receives an RRC CONNECTION RELEASE message with

redirectedCarrierInfo IE, it performs redirection to the frequency in the target

RAT.


eNodeB


MME


UE

MEASUREMENT REPORT


(Measurement report for

inter-RAT handover)



4 Key Parameter Configuration

4.1 Parameter List

Table 4-1 Handover Related Parameter List

SN Name Figure

1 Band indication for frequency Figure 4-1,4-2

2 Uplink center carrier frequency Figure 4-1,4-2

3 Downlink center carrier frequency Figure 4-1,4-2

4 Physical cell id Figure 4-1,4-2

5 Close inter-frequency or intersystem measurement

configuration index

Figure 4-5

6 Open inter-frequency measurement configuration

index

Figure 4-5

7 Coverage-based intra-frequency handover

measurement configruration index

Figure 4-5

8 InterFreq measurement configuration index for

handover

Figure 4-5

9 Inter-frequency number Figure 4-6

10 Band indicator for DL frequency Figure 4-6

11 Inter-frequency Figure 4-6

12 Switch for not to remove neighboring cell Figure 4-4

13 Switch for X2 Figure 4-4

14 Switch for HO Figure 4-4

15 S1 handover data direct forward supported Figure 4-4

16 Uplink center carrier Frequency Figure 4-10

17 Downlink center carrier frequency Figure 4-10

18 RNC ID Figure 4-10

19 Cell ID Figure 4-10

20 Cell primary scrambling code Figure 4-10

21 Location Area Code Figure 4-10

22 Routing Area Code Figure 4-10

23 Frequency band indication of UTRAN Figure 4-10

24 UTRAN neighbor cell supported PS HO Figure 4-10



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

4.2 Parameter Configuration Rule

Table 4-2 Parameter rule of parameters

SN Name Description Value Range Default

Value

1

Band

indication

for

frequency

The parameter

indicates the

frequency

band for

downlink and

uplink

frequency. The

downlink and

uplink

frequency is

own to the

sanme band.

1-5,7-14,17-28,101 1



2

Uplink

center

carrier

frequency

The parameter

indicates the

uplink E-UTRA

Absolute

Radio

Frequency

Channel

Number

(EARFCN).

1:1920-1980,

2:1850-1910,

3:1710-1785,

4:1710-1755,

5:824-849,

7:2500-2570,

8:880-915,

9:1749.9-1784.9,

10:1710-1770,11:1427.9

-1452.9,

12:698-716,

13:777-787,

14:788-798, 17:704-716,

18:815-830,19:830-845,

20:832-862,21:1447.9-1

462.9,

22:3410-3490,23:2000-2

020,

24:1626.5-1660.5,25:18

50-1915,

26:814-849,27:807-824,

28:703-748,101:962-977

1930



3

Downlink

center

carrier

frequency

The parameter

indicates the

downlink

E-UTRA

Absolute

Radio

Frequency

Channel

Number

(EARFCN).

1:1920-1980,

2:1850-1910,

3:1710-1785,

4:1710-1755,

5:824-849,

7:2500-2570,

8:880-915,

9:1749.9-1784.9,

10:1710-1770,11:1427.9

-1452.9,

12:698-716,

13:777-787,

14:788-798, 17:704-716,

18:815-830,19:830-845,

20:832-862,21:1447.9-1

462.9,

22:3410-3490,23:2000-2

020,

24:1626.5-1660.5,25:18

50-1915,

26:814-849,27:807-824,

28:703-748,101:962-977

2120

4

Physical

cell id

The parameter

is used to

identify a cell.

There are 504

unique

physical-layer

cell identities.

0-503 0

5 Close

inter-frequ

ency or

intersyste

m

measurem

ent

configurati

on index

The parameter

is used to

close

inter-frequency

measurement

1-2048 10



6 Open

inter-frequ

ency

measurem

ent

configurati

on index

The parameter

is used to open

inter-frequency

measurement.

1-2048 11

7 Coverage-

based

intra-frequ

ency

handover

measurem

ent

configrurati

on index

The parameter

is used to

config

intra-frequency

measurement.

1-2048 50

8 InterFreq

measurem

ent

configurati

on index

for

handover

The parameter

is used to

config

inter-frequency

measurement.

1-2048 70

9

Inter-frequ

ency

number

The parameter

is used to

indicate the

number of

inter-frequency

0-8 0

10 Band

indicator

for DL

frequency

The band of dl

frequency

1-5,7-14,17-28,30-32,33

-43,101 1



11

Inter-frequ

ency

The

paramet

er

indicate

s the

downlin

k

E-UTRA

Absolut

e Radio

Frequen

cy

Channel

Number

(EARFC

N) of

inter-fre

quency.

freqBandInd==1[2110-2170],







freqBandInd==9[1844.9-1879.9],


freqBandInd==11[1475.9-1500.9],







freqBandInd==20[791 -821],

freqBandInd==21[1495.9-1510.9],

freqBandInd==22[3510..3590],

freqBandInd==23[2180..2200],

freqBandInd==24[1525..1559],

freqBandInd==25[1930..1995],

freqBandInd==26[859..894],
















freqBandInd==43[3600-3800]，

freqBandInd==101[1037-1057]

N/A



12 Switch for

removing

neighborin

g cell

the Switch for

the LTE

adjacent-Cell

not being

removed

No[0],Yes [1] Yes [1]

13

Switch for

X2

the Switch for

X2 PS HO not

being

supported

No[0],Yes [1] Yes [1]

14

Switch for

HO

the Switch for

both S1 and

X2 PS HO not

being

supported

No[0],Yes [1] Yes [1]

15 S1

handover

data direct

forward

supported

the enalbe

Flag that S1

HO Data

Direct Forward

can be done

No[0],Yes [1] No[0]

16

Uplink

center

carrier

Frequency

UL Center

carrier

frequency

(I:1922.4-1977.6,

II:1852.4-1907.6,

III:1712.4-1782.6,

IV:1712.4-1752.6,

V:826.4-846.6,

VI:832.4-837.6,VII:2502.

4-2567.6,

VIII:882.4-912.6,

IX:1752.4-1782.4,

X:1712.4-1767.6,

XI:1430.4-1445.4,

XII:701.4-713.6,

XIII:779.4-784.6,

XIV:790.4-795.6,XIX:83

2.4-842.6,XX:834.4-859.

6,XXI:1450.4-1460.4,

XXII:3412.4-3487.6,XXV

:1852.4-1912.6,XXVI:81

6.4-846.6)MHz,step

0.2MHz

N/A



17

Downlink

center

carrier

frequency

Downlink

center carrier

frequency

(I:2112.4-2167.6,

II:1932.4-1987.6,

III:1807.4-1877.6,

IV:2112.4-2152.6,

V:871.4-891.6,

VI:877.4-882.6,VII:2622.

4-2687.6, VIII:927.4-

957.6,

IX:1847.4-1877.4,

X:2112.4-2167.6,

XI:1478.4-1493.4,

XII:731.4-743.6,

XIII:748.4-753.6,

XIV:760.4-765.6,

XIX:877.4-887.6,XX:793

.4-818.6,XXI:1498.4-

1508.4,XXII:3512.4-358

7.6,XXV:1932.4-1992.6,

XXVI:861.4-891.6)MHZ,

step 0.2MHZ

N/A

18 RNC ID

This parameter

represents the

RNC ID or

Extended RNC

ID of a FDD

UTRAN

neighboring

cell. When the

value of the

parameter is in

the range of 0

~ 4095, it

represents the

RNC ID; When

the value of

the parameter

is in the range

of 4096 ~

65535, it

represents the

Extended RNC

ID.

0-65535 0

19 Cell ID Cell ID [0..65535] 0



20

Cell

primary

scrambling

code

Primary

scrambling

code [0..127] 0

21 Location

Area Code

Location area

code of a cell

[1..65533],[65535..6553

5]

It is a Number Text

1

22 Routing

Area Code

Routing Area

Code 0-255 0

23

Band

Indicator

for FDD

DL

Frequency

Band class of

UTRAN FDD

cell

0:1,1:2,2:3,3:4,4:5,5:6,6:

7,7:8,8:9,9:10,10:11,11:

12,12:13,13:14,14:19,16

:20,15:21,17:22,18:25,1

9:26

1[0]

24

UTRAN

neighbor

cell

supported

PS HO

PS HO

capbility for

UTRAN FDD

neighbour cell

0:No,1:Yes Yes

25 Handover

support

PS Handover

enable

indication of

the UTRAN

adjacent-Cell

0: not support;1:support Support

26

UTRAN-fre

quency

number

UTRAN-freque

ncy number 0-32 0

27 RAT

priority

RAT priority

0-255

FDD:[255,2

54,0,0,0,0,0

],

28

Redirectio

n algorithm

for

coverage

This is a switch

for the

algorithm

applied for

coverage

based redirect.

0:Close

1:Open Open



4.3 Parameter Configuration Procedure

4.3.1 Pre-Defined Parameters Configuration

1. Configure the correct cell. In the Configuration Management window on

the EMS, click Modify Area > Managed Element > Radio Parameter >

LTE FDD > E-UTRAN FDD Cell. Click the button to add the correct

cell. The parameters such as frequency, PCI, and bandwidth must meet the

test requirements. Click the button to save the configuration, and

synchronize the configuration data to the eNodeB, see Figure 4-1 and

Figure 4-2.

Figure 4-1 Adding the Cell



Figure 4-2 Cell Parameter Configuration

2. Add the correct neighbor cell relation by using the neighbor cell

configuration tool. In the Configuration Management window on the EMS,

click Configuration > Neighbor Cell Management, and configure the

correct neighbor cells and neighbor cell relation. Follow the steps shown in

Figure 4-3.

Figure 4-3 Automatic Neighbor Cell Configuration Tool



4.3.2 Activate Feature

4.3.2.1 Intra-Site Handover Activation

1. After the neighbor cells are added by using the automatic neighboring cell

configuration tool, click Modify Area > Managed Element > Radio

Parameter > LTE FDD > Neighbor Relation Configuration > E-UTRAN

Neighbor Relation and check whether the intra-site (intra-card or inter-card)

handover records exist, see Figure 4-4.

Figure 4-4 Neighbor Cell Relation Parameter Configuration

2. Correctly configure the intra-frequency and inter-frequency measurement

events. Click Modify Area > Managed Element->Radio Parameter > LTE

FDD > E-UTRAN FDD Cell > Measurement Parameter, and check the

configuration of the intra-frequency and inter-frequency measurement

events. Use the default configuration, see Figure 4-5.



Figure 4-5 Measurement Event Configuration

3. For inter-frequency handover, check whether the inter-frequencies are

added. In general, the automatic neighbor cell configuration tool

automatically adds the inter-frequencies. Click Modify Area > Manged

Element > Radio Parameter > LTE FDD > E-UTRAN FDD Cell >

Measurement Parameter, Configure the Inter-Frequency Number and

Inter-Frequency Measurement Configuration, see Figure 4-6, If you want

to test inter-frequency handover, the Inter-Frequency Number should not be

zero.

Figure 4-6 Inter-Frequency Number and Configuration



4.3.2.2 S1 and X2 Handover Activation

1. After the neighbor cells are added by using the automatic neighbor cell

configuration tool, click Modify Area > Managed Element > Radio

Parameter > LTE FDD > Neighbor Cell Configuration > E-UTRAN

Neighbor Cell and click Modify Area-> Manged Element > Radio

Parameter > LTE FDD > Neighbor Relation Configuration > E-UTRAN

Neighbor Relation to check whether the inter-site (S1 or X2) handover

records exist.

2. Check the parameters configured by the automatic neighbor cell

configuration tool. Use the default configuration, see Figure 4-5 and Figure

4-6.

3. Add X2 SCTP for X2 handover. Click Modify Area > Managed Element >

Transmission Network > Signaling and Business > SCTP. Click to

add the X2 SCTP link, see Figure 4-7. X2AP will be automatically added,

see Figure 4-8.

Figure 4-7 X2 SCTP Configuration



Figure 4-8 X2AP Configuration

4. After X2 handover is configured, sometimes S1 handover may also be

needed. Delete the X2 connection or disable X2 to perform S1 handover.

Click Modify Area > Managed Element > Radio Parameter > LTE FDD >

Neighbor Relation Configuration > E-UTRAN Neighbor Relation. Modify

the switch for X2 to No[0], and perform S1 handover, see Figure 4-9.

Figure 4-9 Disabling X2



4.3.2.3 Inter-RAT Handover Activation

1. For inter-RAT handover (LTE to 3G/2G), add the neighbor cells and

configure the neighbor cell relation. Click Modify Area > Managed

Element > Radio Parameter > LTE FDD > Neighbor Cell Configuration >

UTRAN FDD Neighbor Cell, see Figure 4-10. Click Modify Area->

Managed Element->Radio Parameter -> LTE FDD ->Neighbor Relation

Configuration->UTRAN-FDD Neighbor Relation, see Figure 4-11.

Figure 4-10 UTRAN-FDD Neighbor Cell Configuration

Figure 4-11 UTRAN-FDD Neighbor Cell Relation Configuration



2. Click Modify Area > Managed Element > Radio Parameter > LTE FDD >

E-UTRAN FDD Cell > Measurement Parameter to configure the UTRAN

frequencies and number in the measurement configuration. The configured

frequencies should be the same with the UTRAN-FDD neighbor cells. Set

the frequency priority to the default value, see Figure 4-12.

Figure 4-12 UTRAN Frequency Number and Parameters

4.3.2.4 Inter-RAT Redirection Activation

1. For inter-RAT redirection based on measurements, configure the inter-RAT

neighboring cells, see Figure 4-10. Click Modify Area > Managed Element >

Radio Parameter > LTE FDD > Neighbor Relation Configuration >

UTRAN-FDD Neighbor Relation to configure the neighbor cell relation, see

Figure 4-13.



Figure 4-13 UTRAN-FDD Neighbor Cell Relation Configuration

2. For blind Redirection, configure the redirection frequencies in the

measurement configuration, see Figure 4-12. The frequency priority must be

non-zero values. Click Modify Area > Managed Element > Radio

Parameter > LTE FDD > E-UTRAN FDD Cell > Measurement Parameter

to configure the RAT priority, see Figure 4-14.

Figure 4-14 RAT Priority Configuration

3. Click Modify Area > Managed Element > Radio Parameter > LTE FDD >

E-UTRAN FDD Cell, and set Redirection Algorithm for Coverage to

Open[1], see Figure 4-15.



Figure 4-15 Redirection Switch Configuration

4.3.3 Other Parameter Configuration Procedure

1. For measurement event modification (in general, the default value is

acceptable), click Modify Area > Managed Element > Radio Parameter >

LTE FDD > E-UTRAN FDD Cell > Measurement Parameter to check the

event ID, for example, the default values of Open Inter Frequency

Measurement Configuration Index are 20 (RSRP, commonly used) and

21 (RSRQ, not used by default, needs to open the dual-measurement

switch). Click Modify Area > Managed Element > Radio Parameter > LTE

FDD > Measurement Parameter Configuration > UE E-UTRAN

Measurement to find the tables whose Measurement Configuration Index

are 20 and 21. See Figure 4-16 and Figure 4-17.



Figure 4-16 Event Index Related to Measurement Events

Figure 4-17 Parameter Configuration of Measurement Index

4.3.4 Deactivate Feature

Click Modify Area > Managed Element > Radio Parameter > LTE FDD >

Neighbor Relation Configuration > E-UTRAN Neighbor Relation, and set

Switch for HO to No(0) for all handover deactivation, see Figure 4-18.



Figure 4-18 Deactivating Handover

4.3.5 Data Save and Synchronization

1．After modified the parameters, click to save all the data.

2．Select [Configuration Management->Data Synchronization] from the

main menu of the Configuration Management tab. The Data

Synchronization dialog box opens. First select NE, then select

synchronization mode as Incremental synchronization, then click

Synchronize button.

5 Related Counters, KPI and Alarms

5.1 Related Counters

Table 5-1 Related Counters

SN Counter No. Description

1 C373600000

Number of Successful Outgoing Intra-eNB

Intra-freq Handover Preparation




2 C373600001 Number of Outgoing Intra-eNB Intra-freq

Handover Preparation Failure due to

Re-estabilshment to Source Cell


Handover Preparation Failure due to Dest

Preparation Failure


Handover Preparation Failure due to Other

Reason

5 C373600040 Number of Successful Incoming Intra-eNB

Intra-freq Handover Preparation

6 C373600041 Number of Incoming Intra-eNB Intra-freq


Resource Allocation Fail



Occur Reestblishment



Reason

9 C373600080 Number of Successful Outgoing Intra-eNB

Intra-freq Handover Execution


Handover Execution Failure due to



Handover Execution Failure due to Dest



Handover Execution Failure due to Other

Cause

13 C373600084 Number of Successful Incoming Intra-eNB

Intra-freq Handover Execution


Handover Execution Failure due to RRC

Reconfig Complete Timeout


Handover Execution Failure due to Dest







Cause


Handover Preparation Failure due to User

Inactivity


Handover Execution Failure due to Waiting

Reconfiguration Complete timeout

19 C373610300 Number of Successful Outgoing

Inter-eNB(via X2) Intra-freq Handover

Preparation

20 C373610301 Number of Outgoing Inter-eNB(via X2)

Intra-freq Handover Preparation Failure due

to HO Request ACK Timeout



to Dest Preparation Failure



to Other Reason



to Re-estabilshment to Source Cell

24 C373610340 Number of Successful Incoming


Preparation

25 C373610341 Number of Incoming Inter-eNB(via X2)


to Resource Allocation Fail



to Source Cancle HO



to Other Reason



Execution





Intra-freq Handover Execution Failure due




to UE Context Release Timeout



to Other Cause



Execution



to RRC Reconfig Complete Timeout



to Path Switch Failure



to Other Cause



to Source Cancel HO



to User Inactivity



to Re-estabilshment to Target Cell





Intra-freq Handover Preparation Request


Inter-eNB(via S1) Intra-freq Handover

Preparation

42 C373620601 Number of Outgoing Inter-eNB(via S1)





to HO Command Timeout






to Other Reason






Preparation

47 C373620641 Number of Incoming Inter-eNB(via S1)



48

C373620642

Number of Incoming Inter-eNB(via S1)


to Source Cancel HO

49

C373620643



to Other Reason

50

C373620680

Number of Successful Outgoing


Execution

51

C373620681

Number of Outgoing Inter-eNB(via S1)



52

C373620682




53

C373620683



to Other Cause

54

C373620684

Number of Successful Incoming


Execution







56

C373620686



to Source Cancel HO

57

C373620687



to Other Cause

58

C373620688



to User Inactivity

59

C373620689




60

C373620690




61 C373620691


Intra-freq Handover Preparation Request

62 C373630900


Inter-freq Handover Preparation

63

C373630901

Number of Outgoing Intra-eNB Inter-freq



64

C373630902



Preparation Failure

65

C373630903



Reason

66 C373630940

Number of Successful Incoming Intra-eNB

Inter-freq Handover Preparation

67

C373630941

Number of Incoming Intra-eNB Inter-freq


Resource Allocation Fail

68

C373630942


Handover Preparation Failure due to Dst

occur Re-establishment

69 C373630943 Number of Incoming Intra-eNB Inter-freq





Reason

70 C373630980


Inter-freq Handover Execution

71

C373630981


Handover Execution Failure due to


72

C373630982


Handover Execution Failure due to Dst


73

C373630983



Cause

74 C373630984

Number of Successful Incoming Intra-eNB

Inter-freq Handover Execution

75

C373630985


Handover Execution Failure due to RRC

Reconfig Complete Timeout

76

C373630986


Handover Execution Failure due to Dst


77

C373630987



Cause

78

C373630988


Handover Preparation Failure due to User

Inactivity

79

C373630989


Handover Execution Failure due to Waiting

Reconfiguration Complete Timeout

80

C373641200


Inter-eNB(via X2) Inter-freq Handover

Preparation

81

C373641201

Number of Outgoing Inter-eNB(via X2)

Inter-freq Handover Preparation Failure due

to HO Request ACK Timeout

82

C373641202







83

C373641203



to Other Reason

84

C373641204




85

C373641240



Preparation

86

C373641241

Number of Incoming Inter-eNB(via X2)



87

C373641242



to Source Cancel HO

88

C373641243



to Other Reason

89

C373641280



Execution

90

C373641281


Inter-freq Handover Execution Failure due


91

C373641282




92

C373641283



to Other Cause

93

C373641284



Execution

94

C373641285




95

C373641286



to Path Switch Failure




96

C373641287



to Other Cause

97

C373641288



to Source Cancel HO

98

C373641289



to User Inactivity

99

C373641290




100

C373641291




101 C373641292


Inter-freq Handover Preparation Request

102

C373651500


Inter-eNB(via S1) Inter-freq Handover

Preparation

103

C373651501



to HO Command Timeout

104

C373651502



to Dst Preparation Failure

105

C373651503



to Other Reason

106

C373651504




107

C373651540



Preparation

108

C373651541









to Source Cancel HO

110

C373651543



to Other Reason

111

C373651580



Execution

112

C373651581




113

C373651582




114

C373651583



to Other Cause

115

C373651584



Execution

116

C373651585




117

C373651586



to Source Cancel HO

118

C373651587



to Other Cause

119

C373651588



to User Inactivity

120

C373651589




121

C373651590








Inter-freq Handover Preparation Request

5.2 Related KPI

Table 5-2 Related KPI

SN KPI No. Description

1

340031

Number of Outgoing Intra-RAT Intra-freq

Handover Preparation

Failure(Re-estabilshment to Source Cell)

2

340032


Handover Preparation Failure(Dest

Preparation Failure)

3

340033


Handover Preparation Failure(User

Inactivity)

4

340034


Handover Preparation Failure(HO Request

Ack Timeout)

5

340035


Handover Preparation Failure(Other

Reason)

6 340040

Number of Successful Incoming Intra-RAT

Intra-freq Handovers Preparation

7

340041

Number of Incoming Intra-RAT Intra-freq

Handover Preparation Failure(Resource

Allocation Fail)

8

340042


Handover Preparation Failure(Dest Occur

Reestblishment)

9

340043


Handover Preparation Failure(Source

Cancle HO)

10

340044



Reason)

11 340046


Intra-freq Handovers Execution

12 340047

Number of Outgoing Intra-RAT Inter-freq

Handover Preparation



SN KPI No. Description

Failure(Re-estabilshment to Source Cell)

13

340048


Handover Preparation Failure(Dest

Preparation Failure)

14

340049


Handover Preparation Failure(User

Inactivity)

15

340050


Handover Preparation Failure(HO Request

Ack Timeout)

16

340051



Reason)

17 340053


Inter-freq Handovers Preparation

18

340054

Number of Incoming Intra-RAT Inter-freq

Handover Preparation Failure(Resource

Allocation Fail)

19

340055


Handover Preparation Failure(Dest Occur

Reestblishment)

20

340056


Handover Preparation Failure(Source

Cancle HO)

21

340057



Reason)

22 340059


Inter-freq Handovers Execution

23 340060

Success Rate of Intra-RAT Intra-freq Cell

Incoming Handover

24 340061

Success Rate of Intra-RAT Inter-freq Cell

Incoming Handover

5.3 Related Alarms

No.



6 Abbreviations

1xRRT CDMA2000 1x Radio Transmission Technology

3GPP 3rd Generation Partnership Project

BCCH Broadcast Control Channel

CCO Cell Change Order

CDMA2000 Code Division Multiple Access 2000

CIO Cell Individual Offset

CS Circuit-Switched

CSG Closed Subscriber Group

DL Downlink

DRX Discontinuous Reception

eNodeB E-UTRAN NodeB

EPLMN Equivalent PLMN

E-UTRAN Evolved Universal Terrestrial Radio Access Network

FDD Frequency Division Duplex

GERAN GSM EDGE Radio Access Network

GSM Global System for Mobile Communications

HRPD High Rate Packet Data

HPLMN Home PLMN

ID Identity

IMSI International Mobile Subscriber Identity

LTE Long-Term Evolution

MIB Master Information Block

MME Mobility Management Entity

NAS Non Access Stratum

PS HO Packet-switched handover

PLMN Public Land Mobile Network



RAT Radio Access Technology

RSRP Reference Signal Received Power

RSRQ Reference Signal Received Quality

SGW Serving GateWay

SIB System Information Block

SIM Subscriber Identity Module

SRVCC Single Radio Voice Call Continuity

TA Timing Advance

TA Tracking Area

USIM Universal Subscriber Identity Module

UE User Equipment

UTRAN Universal Terrestrial Radio Access Network

UL Uplink

VPLMN Visited PLMN

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