activating and testing dual transfer mode

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Nokia Siemens Networks

GSM/EDGE BSS, Rel.

RG20(BSS), OperatingDocumentation, Issue 03

Activate

Activating and Testing BSS20088: Dual

Transfer Mode

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Activating and Testing BSS20088: Dual Transfer Mode

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Table of contentsThis document has 14 pages.

Summary of changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1 Activating Dual Transfer Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2 Testing the activation of Dual Transfer Mode on cell level . . . . . . . . . . . 8

3 Testing the activation of Dual Transfer Mode on network level . . . . . . . 10

4 Deactivating and testing Dual Transfer Mode . . . . . . . . . . . . . . . . . . . . 14



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DN0574489 5

Activating and Testing BSS20088: Dual Transfer Mode Summary of changes

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Summary of changesChanges between document issues are cumulative. Therefore, the latest document

issue contains all changes made to previous issues.

Changes made between issues 2-1 and 2-0

PMRG values have been changed to EPM/GPM, therefore the commands are pre-

sented separately for both parameters in Testing the activation of Dual Transfer Mode

on network level.

Changes made between issues 2-0 and 1-0

Information that Dual Transfer Mode (DTM) can be activated at any time has been

added to chapter Activating Dual Transfer Mode.

Information that if handovers function in a normal call, you do not need change the

handover parameters for DTM has been added to chapter Testing the activation of Dual

Transfer Mode on network level .

Information concerning the test environment has been added to chapter Testing the acti-

vation of Dual Transfer Mode on network level .

References have been updated.



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Activating Dual Transfer Mode

1 Activating Dual Transfer ModeDual Transfer Mode (DTM) is licence-based application software. The type of the

licence is on/off. The DTM feature state can be ON, OFF, or CONF. You can modify

parameters related to DTM when the DTM feature state is ON or CONF. DTM also

requires a valid PCU2 licence.

When the DTM or PCU2 licence expires or the state of DTM or PCU2 is changed to OFF

or CONF, the value of the DTM enabled parameter is changed to N in all segments of

the BSC. You can change the value of the DTM enabled parameter to Y only if the state

of both DTM and PCU2 is ON.

Although the DTM licence is BSC wide, DTM is always activated at segment level.

To guarantee service continuity during cell changes, it is best to activate DTM in all cells

within a specific geographical area.

When cell A is defined as a neighbour cell to cell B, adjacent cell object A is created in

cell B. When cells A and B are in the same BSC and DTM is enabled in cell A, the value

of the DTM enabled parameter is automatically changed to Y also in adjacent cell

object A in cell B. The DTM state of the external neighbour cells must be specified man-

ually.

Activating DTM does not cause downtime, so you can do it at any time.

For a description of Dual Transfer Mode (DTM), see Dual Transfer Mode under Feature

descriptions/Data in the PDF view.

Before you start

Make sure that the MSC supports the international mobile subscriber identity (IMSI)

delivery.

In a Nokia MSC, the COMMON ID INFORMATION SUPPORTED parameter specifies

whether IMSI delivery is supported.

Steps

1 Check that the licences that cover PCU2 and DTM have been installed (W7I).

ZW7I:LIC,FULL:LIC=<licence code>;

For instructions on installing licences, see Licensing in BSC under Install and

upgrade/Software in the PDF view.

2 Check the value of the PCU2 and DTM feature states (W7I).

ZW7I:FEA,FULL:FEA=13;

ZW7I:FEA,FULL:FEA=63;

3 If necessary, change the PCU2 and DTM feature states to ON (W7M).

ZW7M:FEA=13:ON;

ZW7M:FEA=63:ON;

4Check that GPRS/EDGE is enabled in the segment (EQO).ZEQO:SEG=<SEG identification>:GPRS;

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5 If necessary, enable GPRS/EDGE in the segment (EQV).

For instructions on enabling GPRS, see Activating and Testing BSS9006: GPRS under

Test and activate/Data in the PDF view.For instructions on enabling EGPRS, see Activating and Testing BSS10083: EGPRS

under Test and activate/Data in the PDF view.

6 Change the value of the DTM enabled parameter to Y (EQV).

ZEQV:SEG=<SEG identification>::::DENA=Y;





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Testing the activation of Dual Transfer Mode on cell lev-el

2 Testing the activation of Dual Transfer Mode

on cell level

Before you start

Make sure that the following network elements and mobile stations (MSS) are available:

• 1 DX MSC (MSC) that supports the internal mobile subscriber identity (IMSI)

delivery

• 1 base station controller (BSC) that supports DTM

• 1 base transceiver station (BTS)

• 1 transceiver (TRX)

• 1 serving GPRS support node (SGSN)

• 2 MSS, one of which supports DTM

• web server

Make sure that you have at least two packet data channels in the packet-switched (PS)

territory. Two channels are required so that the DTM circuit-switched (CS) and PS con-

nections can be allocated to the PS territory. If a territory upgrade is required before the

DTM call can be allocated, it may slow down the call establishment procedure.

Steps

1 Create PS DTM Measurement and CS DTM Measurement (TPM).

ZTPM:GPRS,PS_DTM,<measurement day>,<measurement

interval>,<output interval>;

ZTPM:MEASUR,CS_DTM,<measurement day>,<measurementinterval>,<output interval>;

2 Start the measurements (TPS).

ZTPS:GPRS,PS_DTM;

ZTPS:MEASUR,CS_DTM;

3 Wait until the measurements are enabled and check them (TPI).

ZTPI:GPRS,PS_DTM;

ZTPI:MEASUR,CS_DTM;

4 Establish a speech call between MS 1 and MS 2.

MS 1 must be DTM-capable.

5 Establish a PS connection.

Use the browser of MS 1 to download data from the web server.

6 Disconnect the calls.

First, stop the browsing on MS 1. Then, disconnect the speech call on MS 2.















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7 Check the measurement data.

At the end of the measurement period, check the measurement data in Nokia NetAct.

You can also use the MEFICO tool. For more information, see• Reporter and Performance Management Principles in Nokia NetAct Product Docu-

mentation

• Converting BSC Measurement and Observation Result Files with MEFICO under

Operate and maintain in the PDF view.

8 Stop the measurements (TPE).

ZTPE:GPRS,PS_DTM;

ZTPE:MEASUR,CS_DTM;

Expected outcomeThe speech call continues uninterrupted during the data transfer and conversation con-

tinues after the PS connection is disconnected.

The following counters of PS DTM Measurement are updated:

• 105009 DTM ALLOCATIONS INITIAL

• 105011 DTM DURATION SUM FR

• 105015 PEAK OF SIMULTANEOUS DTM CS CONNECTIONS

Depending on the conditions of the packet traffic, the following counters are also

updated:

• 105016 DTM REQUESTS OF 1 UL PS TSL - 105019 DTM REQUESTS OF 2 DL

PS TSL

• 105021 DTM ALLOCATIONS OF 1 UL PS TSL - 105024 DTM ALLOCATIONS OF

2 DL PS TSL

The following counters of CS DTM Measurement are updated:

• 106000 MO DTM CALL INITIAL REQUESTS

• 106011 DTM RELEASES DUE PS RELEASE

• 106018 DTM ASSIGNMENT COMMANDS

Depending on the capability of the MS and other conditions, also other counters may be

updated.

Further informationFor more information on the measurements, see

• 105 PS DTM Measurement under Reference/Counters/performance indica-

tors/Packet-switched measurements in the PDF view

• 106 CS DTM Measurement under Reference/Counters/performance indicators/Cir-

cuit-switched measurements in the PDF view







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Testing the activation of Dual Transfer Mode on net-work level

3 Testing the activation of Dual Transfer Mode

on network level

The power budget (PBGT) values used in this test case have been specified so thatonce the Dual Transfer Mode (DTM) call has been established and the value of the

target cell's HO margin pbgt (PMRG) parameter is decreased to minimum, a normal

power budget handover is performed to the target cell. For the handover to succeed, it

is assumed that the signal strength of the target cell is at least -100 dBm and that the

signal strength of the target cell is no more than 24 dB weaker than that of the source

cell. After the handover, a DTM call is re-established in the target cell. Adjacency has

only been defined in one direction, so that the target cell can be used to re-establish a

DTM call without the call being handed over back to the source cell.

If the handovers function in a normal call, you do not need change the handover param-

eters for the DTM.

Note that this test case example is intended to a testbed environment. You can make

the test in a live network by changing the location of a mobile station without modifying

the parameters.

Before you start

Make sure that the following network elements and mobile stations (MSS) are available:

• 1 mobile serving switching centre (MSC) that supports the international mobile sub-

scriber identity (IMSI) delivery

• 1 base station controller (BSC) that supports DTM

If you want to test an external handover, you need two BSCs that both support DTM.

• 2 base transceiver stations (BTS)

• 2 transceivers (TRX)

• 1 serving GPRS support node (SGSN)

• 2 MSS, one of which supports DTM

• web server

In addition, Network Operation Mode I (NOM I) is required. NOM I requires the Gs inter-

face.

Steps

1 Create Handover Measurement, PS DTM Measurement, and CS DTM Measure-

ment (TPM).

ZTPM:MEASUR,HO,<measurement day>,<measurement interval>,<output

interval>;

ZTPM:GPRS,PS_DTM,<measurement day>,<measurement


ZTPM:MEASUR,CS_DTM,<measurement day>,<measurement


2 Start the measurements (TPS).

ZTPS:MEASUR,HO;

ZTPS:GPRS,PS_DTM;













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ZTPS:MEASUR,CS_DTM;

3 Wait until the measurements are enabled and check them (TPI).

ZTPI:MEASUR,HO;

ZTPI:GPRS,PS_DTM;

ZTPI:MEASUR,CS_DTM;

4 Modify signal quality threshold parameters (EHQ).

ZEHQ:BTS=<source BTD

id>:QDR=7,QDP=32,QDN=32,QUR=7,QUP=32,QUN=32;

5 Modify signal strength threshold parameters (EHS).

ZEHS:BTS=<source BTS id>:LDR=-110,LDP=32,LDN=32,LUR=-

110,LUP=32,LUN=32;

6 Modify signal interference threshold parameters (EHI).

ZEHI:BTS=<source BTS id>:IDR=-47,IDP=32,IDN=32,IUR=-

47,IUP=32,IUN=32;

7 Enable PBGT handover in the source BTS (EHG).

ZEHG:BTS=<source BTS id>:EPB=Y,HPP=1;

8 Create and modify adjacent cell parameters (EAC).

For an internal inter-cell handover, use the following command if the DTM MS is EGPRS

capable:

ZEAC:BTS=<source BTS id>::ABTS=<target BTS id>::EPM=63,SL=-100;

or use the following command if the DTM MS is GPRS capable:

ZEAC:BTS=<source BTS id>::ABTS=<target BTS id>::GPM=63,SL=-100;

For an external handover, use the following command if the DTM MS is EGPRS

capable:

ZEAC:BTS=<source BTS id>::MCC=<mobile country code>,MNC=<mobilenetwork code>,LAC=<location area code>,CI=<cell

identification>,BCC=<bts colour code>,FREQ=<BCCH

frequency>:EPM=63,SL=-100;

or use the following command if the DTM MS is GPRS capable:

ZEAC:BTS=<source BTS id>::MCC=<mobile country code>,MNC=<mobile

network code>,LAC=<location area code>,CI=<cell

identification>,BCC=<bts colour code>,FREQ=<BCCH

frequency>:GPM=63,SL=-100;



























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Testing the activation of Dual Transfer Mode on net-work level

9 Establish a PS connection.

Use the browser of MS 1 to download data from the web server. MS 1 must be DTM-

capable.Keep the downloading process in progress so that data is transferred continuously.

10 Make a speech call.

Use MS 2 to make a speech call to MS 1.

11 Modify adjacent cell parameters (EAM).

Use the following command if the DTM MS is EGPRS capable:

ZEAM:BTS=<source BTS id>:INDEX=<target BTS index>:::EPM=-63;

Use the following command if the DTM MS is GPRS capable:

ZEAM:BTS=<source BTS id>:INDEX=<target BTS index>:::GPM=-63;

This step is performed so that a handover can be triggered.

12 Keep downloading data from the web server.

13 Disconnect the speech call on MS 2.

14 Stop the downloading on MS 1.

15 Check the measurement data.

At the end of the measurement period, check the measurement data in Nokia NetAct.

You can also use the MEFICO tool. For more information, see

• Reporter and Performance Management Principles in Nokia NetAct Product Docu-

mentation

• Converting BSC Measurement and Observation Result Files with MEFICO under

Operate and maintain in the PDF view.

16 Stop the measurements (TPE).

ZTPE:MEASUR,HO;

ZTPE:GPRS,PS_DTM;

ZTPE:MEASUR,CS_DTM;

Expected outcome

The PS connection is re-established in dual transfer mode on the target cell after the

handover. The PS data transfer is completed successfully after the speech call.

The following counters are updated in the source cell:

• 004198 DTM CALL HO ATTEMPTS TO DTM CELL

•

004199 DTM CALL HO SUCCESS TO DTM CELL• 105009 DTM ALLOCATIONS INITIAL













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• 106013 DTM RELEASES DUE CS HANDOVER


•106019 GTTP MESSAGES UL

Depending on the conditions of the packet traffic, also one or both of the following

counters are updated in the source cell:

• 105000 MT DTM CALL INITIAL REQUESTS



updated in the source cell:


PS TSL


2 DL PS TSL

The following counters are updated in the target cell:

• 004194 DTM CALL HO FROM DTM CELL SUCCEEDED (not updated in an

external handover)

• 105009 DTM ALLOCATIONS INITIAL


• 106012 DTM RELEASES DUE CS RELEASE


• 106019 GTTP MESSAGES UL

Depending on the conditions of the packet traffic, also one or both of the following

counters are updated in the target cell:

• 105000 MT DTM CALL INITIAL REQUESTS



updated in the target cell:


PS TSL


2 DL PS TSL

Depending on the capability of the MS and other conditions, also other counters may be

updated in both cells.

Further information

For more information on the measurements, see

• 105 PS DTM Measurement under Reference/Counters/performance indica-

tors/Packet-switched measurements in the PDF view

• 106 CS DTM Measurement under Reference/Counters/performance indicators/Cir-

cuit-switched measurements in the PDF view



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Deactivating and testing Dual Transfer Mode

4 Deactivating and testing Dual Transfer Mode

Steps

1 To implement this step, choose one of the following alternatives:

a To deactivate DTM in a specific cell, change the value of the DTM enabled

parameter to N (EQV).

ZEQV:SEG=<SEG identification>::::DENA=N;

b To deactivate DTM entirely, change the DTM feature state to OFF (W7M).

ZW7M:FEA=63:OFF;

Changing the DTM feature state to OFF also changes the value of the DTM

enabled parameter in all cells to N.

2 Establish a speech call between MS 1 and MS 2.

MS 1 must be DTM capable.

3 Try to use MS 1 to establish a PS connection.

Use the browser of MS 1 to download data from a web server.

Expected outcome

The conversation continues over the speech call, but you cannot establish a PS connec-

tion during the speech call.





activating and testing dual transfer mode

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