Configuring the Packet Data Traffic Channel (PDTCH)

Last updated: September 1, 2009

This section is not applicable to GSM.

This section contains the following:

GPRS and EGPRS Packet Data Traffic Channel Parameters

The GPRS and EGPRS packet data traffic channel parameters are configured using the following call processing subsystem commands. Click on the link to the GPIB command to find more information about the parameter.

For a complete list of GPIB commands in the call processing subsystem, refer to CALL Subsystem .

The following parameters are accessible on the front panel under the PDTCH Parameters (F9) on the Call Setup screen. See How Do I Configure the PDTCH Parameters? for more information.

PDTCH Parameters
Parameter	GPIB Command
BLER Block Polling Interval	CALL:FUNCtion:DATA:BLOCk:POLLing:INTerval[:SELected]
Data Connection Frame Number Type	CALL:FUNCtion:DATA:BLOCk:POLLing:INTerval:ACKB
Data Connection LLC Frame Check Sequence	CALL:FUNCtion:DATA:BLER:LLC:FCSequence
Data Connection Type	CALL:FUNCtion:CONNection:TYPE
Downlink Burst Current Absolute Power Level	CALL:(PDTCH\|PDTChannel):POWer[:AMPLitude]:BURSt<[1]\|2\|3\|4\|5>?
Downlink Burst Power Reduction Selection	CALL:(PDTCH\|PDTChannel):PREDuction:BURSt<[1]\|2\|3\|4\|5>
Downlink Power Reduction Level (dB)	CALL:(PDTCH\|PDTChannel):PREDuction:LEVel<1\|2>
EGPRS Modulation Coding Scheme for Active Cell Operating Mode	CALL:(PDTCH\|PDTChannel):MCSCheme ( EGPRS Only )
EGPRS Modulation Coding Scheme for BCH+PDTCH Test Mode Operating Mode	CALL:(PDTCH\|PDTChannel):MCSCheme:EBPTest[:BURSt1] (EGPRS Only) CALL:(PDTCH\|PDTChannel):MCSCheme:EBPTest:BURSt<2\|3\|4\|5> ( EGPRS Only )
EGPRS Supplementary Polling	CALL:(PDTCH\|PDTChannel):ESPolling
First Burst to Loop (Downlink)	CALL:(PDTCH\|PDTChannel):MSLot[:FIRSt]:DOWNlink:LOOPback[:BURSt]
GPRS PDTCH Coding Scheme	CALL:(PDTCH\|PDTChannel):CSCHeme ( GPRS Only ) CALL:(PDTCH\|PDTChannel):CSCHeme:UPLink ( GPRS Only ) CALL:(PDTCH\|PDTChannel):CSCHeme:DOWNink ( GPRS Only )
Incremental Redundancy State for EGPRS	CALL:(PDTCH\|PDTChannel):IREDundancy[:STATe]
Multislot Configuration	CALL:(PDTCH\|PDTChannel):MSLot:CONFig
Meas Burst	CALL:(PDTCH\|PDTChannel):MSLot:MEASurement:BURSt
P0 for Downlink PDTCH	CALL:(PDTCH\|PDTChannel):PZERo:LEVel
Packet Data Traffic Channel (ARFCN)	CALL:(PDTCH\|PDTChannel)[:ARFCn][:SELected]
Packet Data Traffic Channel Band	CALL:(PDTCH\|PDTChannel):BAND
Packet Power Timing Advance State	CALL:(PDTCH\|PDTChannel):PMESsage:PPTadvance
Packet Timeslot Reconfigure State	CALL:(PDTCH\|PDTChannel):PMESsage:PTReconfig
Payload Pattern (BLER)	CALL:FUNCtion:DATA:PAYLoad:PATTern:BLER
Payload Pattern (OTHER)	CALL:FUNCtion:DATA:PAYLoad:PATTern[:OTHer]
Persistent Attach	CALL:MS:PATTach[:STATe]
Puncturing Scheme for EGPRS	CALL:(PDTCH\|PDTChannel):MCSCheme:PSCHeme
Uplink Burst Configuration	CALL:(PDTCH\|PDTChannel):UPLBurst:CONFig[:SVALue] CALL:(PDTCH\|PDTChannel):UPLBurst:CONFig:STATe CALL:(PDTCH\|PDTChannel):UPLBurst:CONFig:VALue
Unused Downlink Burst Current Absolute Power Level	CALL:(PDTCH\|PDTChannel):POWer[:AMPLitude]:UNUSed?
Unused Downlink Burst Power Reduction Selection	CALL:(PDTCH\|PDTChannel):PREDuction:UNUSed
Adjacent Downlink Burst Current Absolute Power Level	CALL:(PDTCH\|PDTChannel):POWer[:AMPLitude]:BURSt<[1]\|2\|3\|4\|5>?
Adjacent Downlink Burst Power Reduction Selection	CALL:(PDTCH\|PDTChannel):PREDuction:ADJacent
Deferred Parameters
Deferred Packet Data Traffic Channel Band	CALL:SETup:(PDTCH\|PDTChannel):BAND
Deferred Packet Data Traffic Channel (ARFCN)	CALL:SETup:(PDTCH\|PDTChannel)[:ARFCn]:(DCS\|EGSM\|GSM450\|GSM480\|GSM750\|GSM850\|PCS\|PGSM\|RGSM\|TGSM810)
Deferred GPRS PDTCH Coding Scheme	CALL:SETup:(PDTCH\|PDTChannel):CSCHeme
Deferred EGPRS Modulation Coding Scheme for Active Cell Operating Mode	CALL:SETup:(PDTCH\|PDTChannel):MCSCheme ( EGPRS Only )
Deferred Multislot Configuration	CALL:SETup:(PDTCH\|PDTChannel):MSLot:CONFig
Deferred P0 for Downlink PDTCH	CALL:SETup:(PDTCH\|PDTChannel):PZERo:LEVel

How Do I Configure the PDTCH Parameters?

This section contains two procedures. The first procedure explains how to configure the immediate PDTCH parameters. The second procedure explains how to set the deferred PDTCH parameter. See Using Deferred Parameters for more information on deferred parameters.

How Do I Configure the Immediate PDTCH Parameters?
1. Press the CALL SETUP key.
2. Press Operating Mode ( F1 ) and select Active Cell (GPRS, or EGPRS) .
3. Select PDTCH Parameters ( F9 ) from the Call Parms menu.
4. Press the More softkey on the bottom right hand side of the front panel display to access the PDTCH Parms (2 of 3 ) menu.
5. Press Multislot Config ( F7 ), this displays the Multislot Config menu.
6. Use the knob to scroll to and highlight the configuration you want.
How Do I Configure the Deferred PDTCH Parameters?
1. Press the CALL SETUP key.
2. Press Operating Mode ( F1 ) and select Active Cell (GPRS, or EGPRS) .
3. Select Handover Parameters ( F10 ) from the Call Parms menu.
4. Select GPRS Handover Setup ( F8 ) from the Handover menu. This displays the GPRS Handover Setup menu.
5. Use the knob to scroll to and highlight Multislot Config .
6. Press the knob, and the Multislot Config menu is displayed. Use the knob to select which configuration you want.

Using Deferred Parameters

Deferred parameters allow you to set up multiple parameters without implicit over-the-air signalling taking place. Using deferred parameters offers the following benefits:

Code construction is more succinct.
Only one signaling exchange between the test set and the mobile station sets up multiple parameters rather than a separate exchange for each parameter.
Once the current data connection has been established, you can set up the next set of deferred parameters.

Supported Multislot Classes

As shown in the table of configurable parameters, the command to configure the multislot configuration is CALL:(PDTCH|PDTChannel):MSLot:CONFig . The effect this command has on the number of uplink and downlink timeslots depends on the Connection Type (see CALL:FUNCtion:CONNection:TYPE ).

Type A - The multislot configuration command only affects the number of uplink timeslots, therefore configurations D1U1, D2U1, D3U1, D4U1, D5U1 and D6U1 will appear similar.
BLER - The multislot configuration command only affects the number of downlink timeslots, therefore, D2U2 and D2U1 will appear similar. Note that in BLER mode it is not possible to have more uplinks than downlinks.

The actual timeslots used in each configuration are fixed as in the table below.

Multislot Configuration Downlink Timeslots Used Uplink Timeslots Used

D1U1 3 3

D1U2 3 3,4

D1U3 3 3,4,5

D1U4 3 3,4,5,6

D1U5

3

2,3,4,5,6

D1U6

2

1,2,3,4,5,6

D2U1 3,4 4

D2U2 3,4 3,4

D2U3 3,4 3,4,5

D2U4 3,4 3,4,5,6

D2U5

2,3

2,3,4,5,6

D3U1 3,4,5 4

D3U2 3,4,5 4,5

D3U3 3,4,5 4,5,6

D3U4

2,3,4

3,4,5,6

D4U1 3,4,5,6 5

D4U2 3,4,5,6 5,6

D4U3

2,3,4,5

4,5,6

D5U1 2,3,4,5,6 5

D5U2

2,3,4,5,6

5,6

D6U1

1,2,3,4,5,6

5

Custom You can position the timeslots flexibly. See Flexible Timeslot You can position the timeslots flexibly. See Flexible Timeslot

Note: When a multislot configuration change is executed, all measurements will be stopped before the change is made, and re-started after the change has taken effect.

The default Medium Access Mode for multislot configurations that have three or more uplinks is Extended Dynamic Allocation .

NOTE

The current multislot configuration does not change when you switch between GPRS and EGPRS serving cells unless the current multislot configuration is not supported in the serving cell that you are switching to. In this case the multislot configuration changes to the default configuration 2x1.

GPRS Multislot Classes

The test set supports GPRS mobile stations with multislot class 1-12, multislot class 30-34 and multislot class40-45. The following multislot configurations are supported (indicated as Downlink x Uplink): 1x1, 1x2, 1x3, 1x4, 1x5, 1x6, 2x1, 2x2, 2x3, 2x4, 2x5, 3x1, 3x2, 3x3, 3x4, 4x1, 4x2, 4x3, 5x1, 5x2 and 6x1. The test set's operating mode must be Active Cell ( Serving Cell GPRS), GPRS BCH+PDTCH or GPRS BCH+TCH+PDTCH for all the GPRS multislot configurations to be supported.

When the connection type is BLER, the only multislot configurations available are those with the number of downlinks greater than or equal to the number of uplinks in the multislot configuration.
EGPRS Multislot Classes

The test set with the Lab Application license supports EGPRS mobile stations with multislot class 1-12, multislot class 30-34 and multislot class40-45. The following multislot configurations are supported (indicated as Downlink x Uplink): 1x1, 1x2, 1x3, 1x4, 1x5, 1x6, 2x1, 2x2, 2x3, 2x4, 2x5, 3x1, 3x2, 3x3, 3x4, 4x1, 4x2, 4x3, 5x1, 5x2 and 6x1.

See EGPRS Data Rate Configurations for details on which multislot configurations are supported for EGPRS mobile stations and other operating considerations.

Operating Considerations

The immediate multislot configuration parameter is available in all the operating modes except Cell Off and CW. Note that although you can configure the multislot configuration when the operating mode is set to GPRS BCH and EGPRS BCH, these settings do not effect the test set's operation.

When the connection type is set to BLER or SRB Loopback, the multislot configuration cannot have more uplinks than downlinks.

When configuring the base station emulator you must configure the broadcast channel (see CALL:BCHannel ) and the packet data traffic channel (PDTCH). There are a number of parameters for the BCH and the PDTCH that can be configured; however, the test set's default parameters should allow a properly functioning GPRS or EGPRS mobile station to successfully establish a data connection under most circumstances.

The PDTCH (ARFCN) is a frequency banded parameter (see Frequency Banded Parameters ).