2G-3G Interoperability Policy

2G-3G interoperability Policy

12th-August 200912th-August 2009

All Rights Reserved © HUAWEI TECHNOLOGIES CO., LTD. 2006

2G-3G Interoperability Policy

2

3G TO 2G handover Policy

Initial phase of networkDevelopment phase of network

Condition

3G network load is lower 3G network load is heavy

3G network coverage is better than 2G 2G network coverage is better than 3G

Policy

2G reselection to 3G 2G reselection to 3G

2G CS handover to 3G 2G CS handover to 3G policy is forbidden

3G CS handover to 2G policy is forbiddenWhen 3G signal become worst than 2G.or When 3G network load is heavy but 2G load is light.3G CS handover to 2G .

3G PS handover 2G policy is forbidden 3G PS handover 2G policy is forbidden

Advantage

3G network share 2G network load 2G network share 3G network load

3G network repair 2G network coverage 2G network repair 3G indoor coverage

3G users keeps 3G network.3G user enjoy 3G high voice quality and high download service

3G users keeps 3G network.3G user enjoy 3G high voice quality and high download service

Final Purpose

3G users enjoys 3G high voice quality and high download service.2G repair 3G indoor coverage


3G To 2G Interoperability Parameter

3

Parameter

GSM Cell

FunctionAdd a GSM cell neighboring to the WCDMA coverage.

NoteYou need first add the basic information of the GSM, GPRS, or EDGE cell to the RNC using the command ADD GSMCELL. Then set the inter-RAT neighboring relation using the command ADD GSMNCELL.

The CN operator should be in the CN operator index, which is add by MML command: ADD CNOPERATOR.

ADD GSMNCELL

Add GSM Neighboring Cell(ADD GSMNCELL)FunctionAdd a neighboring GSM cell for a WCDMA cell. GSM cells refer to all the 2G network cells, including cells of GSM, GPRS, and EDGE.

After this command is executed, the added GSM cell becomes a neighboring cell of the WCDMA cell.



4

　 Parameter explanation

cell reselecti

on

Inter-RAT Cell Reselection Enable

This parameter specifies whether the cell reselection from a 2G cell to a 3G cell is allowed

Qsearch I This parameter specifies the level threshold for cell reselection in idle mode. We set it to 7,the MS keep searching for 3G cell.

Qsearch P

This parameter specifies one threshold of the signal level for cell reselection in packet transfer mode

FDD Q Offset

Only when the average receive level of a 3G cell is FDD Q Offset greater than that of the serving cell, the 3G cell becomes a candidate cell,now we set to 0,that means always select a cell if acceptable

FDD Qmin

Only when the EC/IO of a 3G cell is greater than FDD Qmin, the 3G cell can be one candidate cell for cell reselection,for trigger cell reselection ,the EC/IO of a 3G cell is continuously greater than FDD Qmin 5 seconds



5

　 Parameter explanation

handover

Qsearch C This parameter specifies the level threshold for cell reselection in connection mode

Inter-RAT Out BSC Handover Enable

This parameter specifies whether the handover from a 2G cell to a 3G cell is allowed.

Inter-RAT In BSC Handover Enable

This parameter specifies whether the handover from a 3G cell to a 2G cell is allowed

Better 3G Cell HO Allowed

This parameter specifies whether the 3G better cell handover algorithm is allowed

Inter-RAT HO Preference

This parameter specifies whether an MS is preferentially handed over to a 2G cell or to a 3G cell

RSCP Threshold for Better 3G Cell HO

If both Inter-RAT Out BSC Handover Enable and Better 3G Cell HO Allowed are set to Yes, a 3G better cell handover is triggered when the RSCP of an adjacent 3G cell is greater than RSCP Threshold for Better 3G Cell HO during a period of time

3G Better Cell HO Watch Time(s)

According to the P/N criterion, if the triggering conditions of 3G better cell handover are met for P consecutive times within N times, a 3G better cell handover is triggered.

3G Better Cell HO Valid Time(s)

According to the P/N criterion, if the triggering conditions of 3G better cell handover are met for P consecutive times within N times, a 3G better cell handover is triggered

　　　

common MSC Version Indication

This parameter indicates the protocol version of the MSC that works with the BSC. The supported signaling varies with the protocol versions

FDD REP QUANT This parameter specifies the measurement report counter of an FDD cell

All Rights Reserved © HUAWEI TECHNOLOGIES CO., LTD. 2006 6

3G <- >2G Interoperability Test Area

• We selected between Taief-Tea and Greaf-west of high way

road for verification 3G2G interoperability

Test Area is located in between Taief -Tea and Greaf-west of high way road

Test Area is located in between Taief -Tea and Greaf-west of high way road


CS 3G To 2G handover signaling Procedure

• From above figures, It is very clearly to see CS connection

handover 3G to 2G successful in probe tool.


CS 2G To 3G handover signaling Procedure

• From above figures, It is very clearly to see CS connection

handover 2G to 3G successful in probe tool.


PS 3G To 2G handover signaling Procedure

• From above figures, It is very clearly to see PS connection

handover 3G to 2G successful in probe tool


PS 2G To 3G handover signaling Procedure

• From above figures, It is very clearly to see PS connection

handover 2G to 3G successful in probe tool


2G To 2G handover signaling Procedure

• From above figures, It is very clearly to see 2G to 2G handover

successful in probe tool


3G To 3G handover signaling Procedure

• From above figures, It is very clearly to see 3G to 3G handover

successful in probe tool

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Documents

2G-3G Interoperability Policy