LTE Call Processing and Handover.eng

8/9/2019 LTE Call Processing and Handover.eng

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Customer Training Center

Jaeho, Lee

Distribution

EnglishED01
http://www.samsung.co.kr/


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CALL S/W Overview


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Network Architecture

UTRAN

GERAN

SGSN

MME

E-UTRANUEServingGateway

HSS

LTE-Uu

S1-U

S1-MME

S3

S6a

S11S10

S4

S12

PDNGateway

PCRF

Operators IPServices

Ex) IMS. PSS etc

S5 SGi

GxRx

LTE Network Architecture


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Protocol Stack

UE Control Plane

UE User Plane

L1

MAC

RLC

PDCP

RRC

NAS

L1

MAC

RLC

PDCP

RRC

L1

L2

IP

SCTP

S1-AP

Relay

L1

L2

IP

SCTP

S1-AP

L1

L2

IP

UDP

GTP-C

L1

L2

IP

UDP

GTP-C

L1

L2

IP

UDP

GTP-C

L1

L2

IP

UDP

GTP-CNAS

LTE-Uu S1-MME S11 S5/S8aUE eNB MME S-GW P-GW

SGi

L1

MAC

RLC

PDCP

IP

App

L1

MAC

RLC

PDCP

L1

L2

UDP/IP

GTP-U

Relay

LTE-Uu S1-U S5/S8

L1

L2

UDP/IP

GTP-U

L1

L2

UDP/IP

GTP-U

Relay

L1

MAC

UDP/IP

GTP-U

IP

UE eNB S-GW P-GW


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eNB Software Architecture

CPS (Call Processing Software): LTE Control & Bearer Protocol processing

OAM (Operation and Maintenance): eNB Operation and Maintenance

MW (Middleware): IPC and Redundancy function

IPRS (IP Routing Software): Routing protocol operation

NP SW (Network Processor Software): Packet forwarding function

OS (Operating System): Embedded Linux

DD (Device Driver): initializing and setting the devices


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Call Software Blocks (1/3)

ECCB

GTPB

PDCB

RLCB

MACB

Other eNB

EPC

PHY

UE

S1-c

X2-cS1-u

X2-u

ECS (eNB Control

Subsystem)

EDS (eNB Data

Subsystem)

LTE eNB

LEGEND :

(UDP port)Control (IPC)

Traffic

SCTB

ECMM

ESCM

ERCM

ERRM

ECCM

EHCM

Uu

ECCB

ECMB

Interface


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ECMB (eNB Common Management Block)

Initiate eNB and set the common channelTransmit system information for initiating UE

Load Control for cell and system overload

ECCB (eNB Call Control Block)

Radio Resource Management, Call Admission Control

RRC/S1-AP ASN.1 Interface, X2-AP ASN.1 Interface

Control the basic call access, S1-AP Paging, Handover call control, Call Trace

SCTB (Stream Control Transmission protocol Block)

S1-C/X2-C SCTP Interface (Association setup/release), S1/X2 AP message

Transmission


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GTPB (GPRS Tunneling Protocol Block)

GPRS(General Packet Radio Service) Tunneling Protocol for data access on S1-U orX2-U.

PDCB (Packet Data Convergence protocol Block)

Header compression and decompression on IP packet stream, Ciphering, Integrity

DL/UL data forwarding on Handover

PDCP sequence number maintenance, Timer based PDCP SDU discard

RLCB (Radio Link Control Block)

Radio Link control and ARQ(Automatic Repeat Request)

RLC SDU concatenation/segmentation/reassemble, In sequence delivery, RLC re-

establishment

RLC PDU re-segmentation, Paging

MACB (Medium Access Control Block)


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Main ID and S1/X2 Procedure


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E-UTRAN Identifiers (1/3)

eNB-Related ID


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UE-Related ID on S1 (for UE-associated signaling)

UE-Related ID on X2 (for X2 Handover)


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Other EPS IDs


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S1 Interface: Procedures (1/2)

Class 1 Procedures

Sender expects response from receiver


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S1 Interface: Procedures (2/2)

Class 2 Procedures

Sender does not expect response


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X2 Interface: Procedures

Class 1 Procedures

Class 2 Procedures


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Basic Call Procedure


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S1 Setup between eNB and MME

Objective

To setup the S1AP connectionExchange configuration information


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X2 Setup between eNB and eNB

Objective

To setup the X2AP connectionExchange configuration information

Neighbor PCI info is exchanged for supporting Automatic PCI Selection


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Attach Procedure (1/2)

UE Source eNB MME S-GW

EPC

4. Initial UE Message(+ Attach Requet)

NAS procedure( Nas security, Authentication )

7. Initial Context Setup Request (+ Attach Accept)

2. RRC Connection Setup

1. RRC Connection Request

3. RRC Connection Setup Complete

5. Create Session Request

6. Create Session Response


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Attach Procedure (2/2)


EPC

10. UE Capbility Info Indication

13. RRC Connection Reconfiguration

8. UE Capability Enquiry

9. UE Capability Information

12. Security Mode Complete

11. Security Mode Command

14. RRC Connection Reconfiguration Complete

15. Initial Context Setup Response

18. Modify Bearer Request

19. Modify Bearer Response

16. Uplink Information Transfer 17. Uplink NAS Transport

Uplink Data


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Detach Procedure(1/2) w/o RRC Connection


EPC

4. Initial UE Message(+ Detach Requet)

9. UE Context Release Command

2. RRC Connection Setup

1. RRC Connection Request

3. RRC Connection Setup Complete (+ Detach Request)

6. Delete Session Response

7. Downlink NAS Transport (+ Detach Accept)

8. Downlink Information Transfer(+ Detach Accept)

10. RRC Connection Release

11. UE Context Release Complete

5. Delete Session Request


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Detach Procedure (2/2) w RRC Connection


EPC

2. Uplink NAS Transport(+ Detach Requet)

7. UE Context Release Command

1. Uplink Information Transfer (+ Detach Request)

4. Delete Session Response

5. Downlink NAS Transport (+ Detach Accept)

6. Downlink Information Transfer(+ Detach Accept)

8. RRC Connection Release

9. UE Context Release Complete

3. Delete Session Request


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LTE Measurement Report Events

Intra-LTE measurement eventsEvent A1 - Serving becomes better than threshold.

=> release the measurement gap.

Event A2 - Serving becomes worse than threshold.

=> setup measurement gap.

Event A3 - Neighbour becomes offset better than serving.

=> trigger Intra-LTE handover

=> execute ANR

Event A4 - Neighbour becomes better than threshold.Event A5 - Serving becomes worse than threshold1 and neighbour becomes

better than threshold2.

Inter-RAT measurement eventsEvent B1 - Inter RAT neighbour becomes better than threshold.

Event B2 - Serving becomes worse than threshold1 and inter RAT neighbour

becomes better than threshold2.

=> trigger Inter-RAT handover


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Measurement Signaling & Info

MeasurementReport

UE EUTRAN

Measurement Reporting from the UE

Measurement Report message has Physical Cell Id (PCI) info of neighbor cell.

Execute handover using PCI of Measurement Report message received from eNB.

In case of neighbor cell of CDMA2000, preRegistrationStatusHRPD information isincluded requested interworking- HRPD.

Cell Global Id (CGI) information is included as requested from eNB.

ANR function is executed using CGI information from UE on eNB.

H d Cl ifi i


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Handover Classification

Intra-RAT Handover

Intra-eNB Handover

Inter-eNB Handover over X2

Inter-eNB Handover over S1 (Intra-MME)

Inter-eNB Handover over S1 (Inter-MME)

Inter-RAT Handover

CDMA2000, GERAN, UTRA, etc.

H d P d [ i li ]


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Handover Procedure [signaling]

H d P d [ i i ]


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Handover Procedure [event-triggering]

H d P d [ t]


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Handover Procedure [measurement]

RSRP [dBm] : Reference Signal Received Power

Absolute value, not related to Payload

RSSI [dBm] : Received Signal Strength Indicator

Received power of center 6RB (1.08MHz)

Directly proportional to Payload

RSRQ [dB] : RSRP/RSSI ratio

Inversely proportional to Payload

Using for handover of cell loading

frequency

0

RSSI [dBm] : 6RB power

(6RB=72subcarrier=1.08MHz)

BW = 10MHz

RSRP [dBm] : carrier powerRS carrier data carrier

H d I t ti Ti


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Handover Interruption Time

I t LTE / I t NB X2 H d


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Intra-LTE / Inter-eNB X2 Handover


EPC

1. MeasurementReport

Target eNB

Downlink/Uplink data Downlink/Uplink data

3. HANDOVER REQUEST ACKNOWLEDGE

5. SN STATUS TRANSFER

4. RRCConnection-Reconfiguration

(mobilityControlinfo)

Data forwarding

6. Synchronization/UL allocation and timing advance

7. RRCConnectionReconfigurationComplete

Forwarded dataUplink data

Forwarded data

Downlink data

Down/Uplink data Down/Uplink data

Uplink data

Downlink data

8. PATH SWITCH REQUEST 9. Modify Bearer Request

End marker

End marker

10. Modify Bearer Response11. PATH SWITCHREQUEST

ACKNOWLEDGE12. UE CONTEXT RELEASE

2. HANDOVER REQUEST

I t LTE / I t NB S1 H d


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Intra-LTE / Inter-eNB S1 Handover (1/2)

UE Source eNB MME S-GWEPC

Target eNB


3. HANDOVER REQUEST

5. Create Indirect DataForwarding Tunnel Request

8. RRCConnection-Reconfiguration

(mobilityControlinfo)

1) Direct data forwarding

1. Decision to trigger a relocation via S1

2. HANDOVER REQUIRED

Indirect data forwarding

6. Create Indirect DataForwarding Tunnel Response

7. HANDOVER COMMAND

9. eNB STATUS TRANSFER

10. MME STATUS TRANSFER

2) Indirect data fowarding

11. Detach from old cell/Synchronize to new cell

12. RRCConnectionReconfigurationComplete

Forwarded dataUplink data Uplink data

4. HANDOVER REQUEST ACKNOWLEDGE

Intra LTE / Inter eNB S1 Hando er


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Intra-LTE / Inter-eNB S1 Handover (2/2)


EPC

Target eNB

Downlink data

Downlink data

End marker

End marker

13. HANDOVER NOTIFY

14. Modify Bearer Request

15. Modify Bearer Response

Forwarded data

16. Tracking Area Update procedure

17. UE CONTEXT RELEASE COMMAND

18. UE CONTEXT RELEASE COMPLETE

19. Delete Indirect Data

Forwarding Tunnel Request

20. Delete Indirect DataForwarding Tunnel Response



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Basic Parameters Setting

MME Configuration


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MME Configuration (1/2)

CHG-MME-CONF : Setup information related MME

Input the MMEs status

connected S1 interface

CLI Command

SRB RLC Configuration


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SRB RLC Configuration (1/2)

CHG-SRB-QCI : Setup QoS information on SRB

CLI Command

SRB RLC Configuration


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SRB RLC Configuration (2/2)

CHG-SRB-RLC : Setup RLC information on SRB

CLI Command

The timer is for the prohibition of transmission of STATUS_STATUS on received-Entity(AM_RLC)

SRB MAC Configuration


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SRB MAC Configuration (1/4)

CHG-LOCH-INF : Setup Logical channel information per QCI

CLI Command

SRB MAC Configuration


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CHG-TRCH-INF : Setup Transport channel information per Cell

CLI Command

Marking cell index for changing or displaying

SRB MAC Configuration 3


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CHG-DRX-INF : Setup DRX information per Cell

CLI Command



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CHG-DPHY-SPS

Change parameters for the operating of Dedicated semiPersistScheduling.

Cell_NUM : 0 ~ 5

PO_NOMINAL_PUSCHPERSISTENT: SPS Po parameter using power control is

-126 ~ 24, default: -80

PO_UEPUSCHPERSISTENT: SPS Po parameters range on Power control per UE: -

8 ~7, default: 0

CHG-DPHY-PUSCH

Change parameters for Dedicated PUSCH operaiton.

Cell NUM: 0 ~ 5

BETA_OFFSET_ACKINDEX: Set the value of multiplexing ACK/NACK and PUSCH.

Range: 0 ~ 15, default: 8

BETA_OFFSET_RIINDEX: Set the value of multiplexing RI and PUSCH


BETA_OFFSET_CQIINDEX: Set the value of multiplexing CQI and PUSCH




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CHG-ULPWR-CTRL

Change parameters for the operating of Dedicated Uplink Power Control.Cell Number: 0 ~5

PO_UE_PUSCH: non-persistent scheduling Po parameter using PUSCH Power

control per UE. Range: -8 ~ 7, default: 0

DELTA_MCSENABLED: Usage possibility for different MCS on Power offset

Range: ci_en0/ci_en1/, default: ci_en0

ACCUMULATION_ENABLE: TPC Mode(accumulation mode/absolute mode)

Range: 0 ~ 1, default: 1(accumulation mode)

PO_UE_PUCCH: Po parameter(-8 ~ 7), default: 0

P_SRSOFFSET: This index is indicating the power offset of PUSCH and SRS:

0~15, default:7



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CHG-CQI-REPORTING

Change parameters for the operating CQI ReportingTRANSMISSION_MODE: ci_tm1,2,3,4, ~ 8. default null

Mode 1: Single antenna port, port 0

Mode 2: Transmit diversity

Mode 3: Large-delay CDD

Mode 4: Closed-loop spatial multiplexing

Mode 5: MU-MIMO

Mode 6: Closed-loop spatial multiplexing, single layer

Mode 7: Single antenna port, UE-specific RS (port 5)

Mode 8 (new in Rel-9): Single or dual-layer transmission with UE-Specific RS

Port 7 and/or 8

Select CQI on Wideband/subband.



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CHG-DPHY-ULSRS

Change the parameters for operating of Dedicated Uplink RS.Cell_NUM: 0 ~ 5

SRS_HOPPING_BANDWIDTH: Set the Area that is became hopping status of

Sounding RS. ci_hbw0 ~ hbw3, default: ci_hbw0

DURATION: Set the duration of sounding RS. If the value is True, the

transmission of Sounding RS is not stopped until disabled. If the value is False

, transmit one time. (Range: 0 ~1), default vlalue: 1

CHG-DPHY-SR

Change the parameters for operating of Dedicated Scheduling Request.

Cell NUM: 0 ~5

DSR_TRANS_MAX: Set the maximum transmittable counts of scheduling

requests until received PUSCH resource on UE.(ci_dsr_TransMax_n4 ~

8,16,32,64) , default value: ci_dsr_TransMax_n64

DRB PDCP Configuration (1/3)


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CHG-PDCP-INF : Set the PDCP information per QCI

CLI Command



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CHG-ROHC-INF : Setup ROHC information per QCI

CLI Command



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CHG-SECU-INF : Set the Security Algorithm information

CLI Command

DRB RLC Configuration


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DRB RLC Configuration

CHG-RLC-INF : Set the RLC information per QCI

CLI Command


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Neighbor Configuration

Neighbor Configuration (1/7)


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The value is different for

opeartors.

Input PLMN Id of eNB operator.

Input the value same as PLMN

ID of eNB.

Creation EUTRA Neighbor PLD update or manually input with CLI on LSMCLI Command

Create information of E-UTRA cells located near a base station



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Parameter Description Range Value

Cell Num Cell number of Base Station 0~5 -

Relation Index Relation Index - -

Status Neighbor status EQUIP or N_EQUIP N_EQUIP

eNB ID Neighbor eNB Identity 20 or 28 BITS -

Local Cell ID Neighbor local cell ID 0 ~ 255 -

eNB Type Neighbor eNB type Macro or Home Macro

eNB MCC Mobile Country Code of

Neighbor eNB

- Ex) Korea: 450

eNB MNC Mobile Network Code ofNeighbor eNB

-

Physical Cell ID Neighbor cell PCI 0 ~ 503 -

TAC Neighbor cell TAC 2 BYTES -

PLMNs PLMN Lists supported neighborcell

- -



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EARFCN UL Uplink EARFCN 0 ~ 65535 -

EARFCN DL Downlink EARFCN 0 ~ 65535 -

Bandwidth UL Uplink Bandwidth n6, n15, n25, n50, n75, n100Its different peroperators.

Bandwidth DL Downlink Bandwidth n6, n15, n25, n50, n75, n100 Its different peroperators.

Individual Offset Cell Individual Offset adaptable

neighbor cell.

dB-24, dB-22, dB-20, dB-18,

dB-16, dB-14, dB-12, dB-10,dB-8, dB-6, dB-4, dB-2, dB-1,dB0, dB1, dB2, dB3, dB4,dB5, dB6, dB8, dB10, dB12,dB14, dB16 dB18, dB20,dB22, dB24

dB0

Qoffset Cell Cell Quality Offset adaptableneighbor cell.

Same dB0

Is RemoveAllowed

Whether or not delete theneighbor cell

TRUE or FALSE TRUE

Is HandoverAllowed

Whether or not handover toneighbor cell

TRUE of FALSE TRUE



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CDMA2000 1xRTT Neighbor creation input remote neighbor widow or CLI

CLI Command

Create the information of CDMA2000 1xRTT Cells located near by a base station



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Cell Num Cell number in base station 0~5 -



SID CDMA2000 1xRTT SID 0 ~ 32767 -

NID CDMA2000 1xRTT NID 0 ~ 65535 -

Base ID CDMA2000 1xRTT Base ID 0 ~ 65535 -

Band Class CDMA2000 1xRTT Band Class bc0, bc1, bc2, bc3, bc4,

bc5, bc6, bc7, bc8, bc9,bc10, bc11, bc12, bc13,bc14, bc15, bc16, bc17

-

ARFCN Neighbor cells ARFCN 0 ~ 2047 -

PN Offset Neighbor cells PN Offset(CDMA2000s PCI)

0 ~ 511 -

Is Remove Allowed Whether or not delete the

neighbor cell

TRUE or FALSE TRUE

Is HandoverAllowed


TRUE of FALSE TRUE



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Creation CDMA2000 HRPD Neighbor input remote neighbor widow or CLI

CLI Command

Create the information of CDMA2000 HRPD Cells located near by a base station



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Cell Num Cell number in base station 0~5 -



Color Code Neighbor Cells Color Code 0 ~ 255 -

BSM ID Neighbor Cells BSM ID 0 ~ 63 -

BSC ID Neighbor Cells BSC ID 0 ~ 1 -

DPSS ID Neighbor Cells DPSS ID 0 ~ 7 -

BTS ID Neighbor Cells BTS ID 0 ~ 2047 -

Sector ID Neighbor Cells Sector ID 0 ~ 7 -

Band Class Neighbor Cells Band Class bc0, bc1, bc2, bc3, bc4, bc5,bc6, bc7, bc8, bc9, bc10,bc11, bc12, bc13, bc14,bc15, bc16, bc17

-

ARFCN Neighbor Cells ARFCN 0 ~ 2047 -

PN Offset Neighbor Cells PN Offset(CDMA2000s PCI)

0 ~ 511 -

Is Remove Allowed Whether or not delete theneighbor cell

TRUE or FALSE TRUE

Is HandoverAllowed


TRUE of FALSE TRUE


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Handover Configuration

Handover Event Configuration Event A3 (1/3)


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Event A3 : Use for Intra LTE Handover and SON ANR

- A3PurposeInraLteHandover

- A3PurposeReportStrongestCells

- Unit: dBm

- Actual value: PLD value * 0.5

- RSRP or RSRQ

- sameAsTriggerQuantity or both

Change EUTRA A3 Criteria information

CLI Command



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Cell Num Cell number in base station 0~5 N/A

Purpose The purpose of Event A3 usage 0:A3PurposeIntraLteHandover1: A3ReportStrongestCells2: A3PurposeSpare_13: A3PurposeSpare_2

N/A

Active State The status of Event A3 0: Inactive1: Active

Active

A3 Offset RSRP threshold value using thecondition of EUTRAmeasurement report triggeringfor Event A3 .(unit: dBm)

-30 ~ 30 4

A3 Report OnLeave

Whether or not to report incase of Event A3 leavingcondition

TRUE or FALSE FALSE

Hysteresis The entry/leave condition onEvent triggered reporting.(unit: dB)

0 ~ 30 0


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Handover Event Configuration Event B2 (1/4)


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Event B2 : Usage for Inter RAT(CDMA2000 1xRTT) Handover

CLI Command

Change CDMA2000 1xRTT B2 Criteria Information



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Event B2 : Usage for Inter RAT(CDMA2000 HRPD) Handover

CLI Command

Change CDMA2000 HRPD B2 Criteria Information



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Cell Num Cell number in base station 0~5 N/A

Purpose The purpose of Event B2 Usage 0: B2PurposeInterRatHandover1: B2PurposeSpare_13: B2PurposeSpare_2

N/A

Active State The status of Event B2 0: Inactive1: Active

Active

B2 Threshold1 (RSRP) RSRP threshold value using thecondition of EUTRAmeasurement report triggeringfor Event B2 .

0 ~ 97 70

B2 Threshold1 (RSRQ) RSRP threshold value using thecondition of EUTRAmeasurement report triggeringfor Event B2.

0 ~ 34 10

B2 Threshold2 CDMA2000 The threshold value using thecondition of CDMA2000 HRPDmeasurement report triggeringfor Event B2.

0 ~ 63 20

Hysteresis The entry/leave condition onEvent triggered reporting.(unit: dB)

0 ~ 30 0



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Time To Trigger The sufficient time inspecific criteria when UE tryto trigger the measurementreport. (unit: ms)

ms0, ms40, ms64, ms80,ms100, ms128, ms160,ms256, ms320, ms480,ms512, ms640, ms1024,ms1280, ms2560, ms5120

ms80

Max Report Cell The maximum number ofcell including Measurementreport on UE.

1 ~ 8 1

Report Interval The interval informationbetween Periodical reports.(unit: ms)

ms120, ms240, ms480,ms640, ms1024, ms2048,ms5120, ms10240, min1,min6, min12, min30, min60,

ms240

Report Amount The number of messageson Measurement report.

r1, r2, r4, r8, r16, r32, r64,infinity

r1

Trigger Quantity

EUTRA

The quantity information

used for evaluating thecondition of EUTRA eventtriggering.

RSRP or RSRQ RSRP

Periodic Report Configuration Periodic (1/4)


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Periodic Report : Usage for ICIC, SON ANR.

CLI Command

Change EUTRA Periodic Criteria Information



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e od c epo Co gu a o ( / )

Periodic Report : Usage for interworking CDMA2000 1xRTT in the future.

Change CDMA2000 1xRTT Periodic Criteria Information

CLI Command



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p g /

Periodic Report: Usage for interworking CDMA2000 HRPD in the future.

CLI Command

Change CDMA2000 HRPD Periodic Criteria Information



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p g


Purpose The purpose of

configuration onPeriodic measurementreporting.

PeriodicalPurposeReportStrongestCells

PeriodicalPurposeReportStrongestCellsForSONPeriodicalPurposeReportCGI

N/A

Active State The operation status ofPeriodic report.

0: Inactive1: Active

Inactive

Trigger Quantity(EUTRA Only)

The quantityinformation forevaluating thetriggering condition forevent.

RSRP or RSRQ RSRP

Report Quantity(EUTRA Only)

The quantityinformation includingMeasurement reportmessage.

SamsAsTriggerQuantity or Both SameAsTriggerQuantity

Max Report Cell The maximum number

of cell includingMeasurement report onUE.

1 ~ 8 1

Report Interval The interval informationbetween Periodicalreports. (unit: ms)

ms120, ms240, ms480, ms640, ms1024,ms2048, ms5120, ms10240, min1, min6, min12,min30, min60,

ms240

Report Amount The number ofmessages on

Measurement report.

r1, r2, r4, r8, r16, r32, r64, infinity r1

Handover Related Timers (1/2)


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X2, S1 Protocol Timers

TX2RELOCprep, TX2RELOCoverall, TS1RELOCprep, TS1RELOCoverall

CLI Command

Change timer operation Information

Handover Related Timers (2/2)


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S1_PATH_SWITCH Target eNB sends Path Switch Request message to MME forS1 handover.

The timer should be set when Target eNB is waiting PathSwitch Request Acknowledge message from MME.

0 ~ 65535 (ms) 3000

S1 HANDOVERPREPARATION

Source eNB sends Handover Request message to targeteNB for S1 handover.The timer should be set when Source eNB is waitingHandover Request Acknowledge message from Target eNB.

0 ~ 65535 (ms) 5000

S1 RELOCOVERALL

After the preparation procedure for S1 Handover, the timershould be set when Source eNB is waiting UE ContextRelease Command message from MME.

0 ~ 65535 (ms) 5000

S1 HANDOVERCANCEL

Source eNB sends Handover Cancel message to MME forS1 handover.The timer should be set when Source eNB is waitingHandover Cancel Acknowledge message from MME.

0 ~ 65535 (ms) 5000

X2 HANDOVERPREPARATION

Source eNB sends Handover Request message to targeteNB for X2 handover.

The timer should be set when Source eNB is waitingHandover Request Acknowledge message from Target eNB.

0 ~ 65535 (ms) 5000

X2 RELOCOVERALL

After the preparation procedure for X2 Handover, the timershould be set when Source eNB is waiting UE ContextRelease message from target eNB.

0 ~ 65535 (ms) 5000

X2 STORE UECONTEXT

After X2 Handover, the MRO timer is working on targeteNB. If target eNB receives RLF indication message whilethis timer is working on Target eNB, MRO statistic function

is executed.

0 ~ 65535 (ms) 10000


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Handover RestrictionConfiguration

eNB-controlled Handover Restriction (1/2)


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NO_HO

If this option parameter is set to TRUE, It is not handover to the

designated eNB.

Set IP version 6 format for specific neighbor eNB IP address.

CLI Command

eNB-controlled Handover Restriction (2/2)


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IS_HOALLOWED

If this option parameter is set to FALSE, It is not handover to the

designated cell.

CLI Command

Change E-UTRA cells information which is located at surrounding base station.


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Documents

LTE Call Processing and Handover.eng