Presentation About Handover From 3G to 2G for ETISALAT

8/11/2019 Presentation About Handover From 3G to 2G for ETISALAT

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0 2014/8/22 Huawei Profile

Presentation about handover from 3Gto 2G f o r E T IS A L A T


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Yang TaoVice Director

UMTS Network Planning & Solution

[email protected]


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3G/2G Interworking Principle

Minimal Impact Principle

Do the best to lessen the impacts on 2G system

Adopts 3G to 2G unidirectional handover to minimize the change to 2G

Adopts unidirectional handover to avoid complex collaboration of 2G/3G

and the risk of ping-pang handover

Least Handover Principle

Reduce handover times, especially the inter-system handover

Best Quality Principle

Improve the successful handover rate


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Advantage of Unidirectional Handover

Simplify inter-network cooperation, it is unnecessary for the upgrade of GSMNSS, save the investment

Avoid the negative effects on 2G network from 3G/2G bidirectional ping-pang

handover

1

2

3

4

5

67

8

9

1

Handover Number

unidirectional handover

Bidirectional handover


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No feature upgrade for existing GSM MSC

GSM MSC 3G MSC

GSM BSS 3G RAN

Standard E interface GSM MAP protocol

Handover from 3G to 2G

Moving UE

Huawei solution for handover from 3G to 2G:no need to upgrade the GSM network

Dual mode UE Dual mode UE

Standard A interface Iu-cs interface

Huawei 3G handover solution, based on standard GSM protocol, can adapt2G network automatically, no impact on GSM MSC.


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Huawei MSC/RNC Enhanced Functions

Huawei 3G MSC performs Basic handover procedure RANAP->BSSMAP conversion Adaptation on E interface, support

MAP V1,V2 Special IE adaptation

2G MSCHuawei RNC BSCIu A

Huawei MSCGSM E Interface

Handover signal

Huawei 3G RNC performs Performance Handover Special IE adaptation

No modification

requirements on GSM

MSC

Huawei MSC/RNC provide enhanced functions to make GSM network unchangedduring handover from 3G to 2G!

3G Network 2G Network


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3G MSC-A MSC-B

MAP-Prep-Handover req. MAP-Allocate-Handover-Number req.

A-HO-REQUEST

Iu-RELOCATION-REQUIRED

BSS-B/MS/UE

VLR-B

A-HO-REQUEST-ACK

MAP-Send-Handover-Report req.MAP-Prep-Handover resp.

IAMMAP-Send-Handover-Report resp. (1)

ACMIu-RELOCATION-COMMAND

A-HO-DETECT

A-HO-COMPLETE

MAP-Process-Access-Sig req.

MAP-Send-End-Signal req.Iu-RELEASE-CMD/COM

ANSWER

RELEASEEnd of call

MAP-Send-End-Signal resp.

UE/MS/RNS-A

Handover from 3G to 2G



Parameter name Request Indication Response Confirm

Invoke Id M M(=) M(=) M(=)

Target Cell Id C C(=)

Target RNC Id C C(=)

HO-NumberNotRequired C C(=)

IMSI C C(=) Integrity Protection Information C C(=)

Encryption Information C C(=)

Radio Resource Information C C(=)

AN-APDU C C(=) C C(=)

Allowed GSM Algorithms C C(=)

Allowed UMTS Algorithms C C(=)

Modification of E interface



Modification of RAN

BSSRAN

Relocation Command

Encryption Information must be include in this message. If no this IE,Dual mode handset will not exectute inter-system handover.



Return to 3G from 2G

Cell reselection Parameters are transmitted in GSM

system information SI 2quater modify SI 2ter SI 3

add SI 2quater

By setting cell reselection parameter, to let UE select

WCDMA network with high priority

Configuration requirements for GSM BSS to cooperate

with UE reselection

Item

GSM BSC configurationrequirements for WCDMA

neighbor cell data

MCC

MNC

RNCID

Cell ID

Primary Scrambling Code

DL Frequency Number

UL Frequency Number

Diversity Indicator


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Presentation About Handover From 3G to 2G for ETISALAT