Fast Device Tune

Downlink Test Sequence (DTS)

A DTS is comprised of a series of Downlink Sequence Steps (DSS) where each sequence step corresponds to one or more identical downlink TDMA frames. A DSS is defined using the following parameters on a per sequence step basis: the frequency at which a DSS is transmitted, the number of active bursts in a TDMA frame, the power level and type of each burst and the number of TDMA frames in a DSS. See DTS Parameters for more information.

Uplink Test Sequence (UTS)

An UTS is comprised of one or more Uplink Sequence Steps (USS) where each sequence step corresponds to one or more uplink TDMA frames. The test set need to know the frequency at which the USS is transmitted, the number of active bursts in a TDMA frame and the state of each burst (On or OFF) before making a measurement on UTS. See UTS Parameters for more information.

The number of TDMA frames in an USS is determined by the measurement settings in the test set. The number of TDMA frames in all the USSs are the same. The mobile should query the number of TDMA frames in an USS before transmitting a UTS.

Actually there is no new measurement introduced for the fast transmitter calibration but only leverage the existing measurement. The measurement that can be performed in the Fast Device Tune mode is called Fast Device Tune capable measurement. The transmit power measurement is currently the only Fast Device Tune capable Measurement. See Fast Device Tune Capable Measurement for more information.

See UTS Parameters for more information.

DTS Parameters

DTS parameters are used to define the DSSs and the transmission behavior of a DTS.

• DTS Continuous

  This parameter determines whether the test set outputs the DTS continuously or only one time (single mode).

  The GPIB command to set/query this parameter is GFDTune:DOWNlink:TSEQuence:CONTinuous .

• DTS Step Count

  This parameter sets the number of DSSs in a DTS. The count does not include the number of times a DSS repeats (to set the repeat count, see Repeat Count ).

  The GPIB command to set/query this parameter is GFDTune:DOWNlink:TSEQuence:SSTep[:COUNt] .

• DTS Start

  This parameter initiates the DTS. If the DTS Continuous is configured for continuous operation the test set continuously outputs the DTS until it is stopped (see DTS Stop ), otherwise the test set outputs the DTS one time. The test set applies any changes of the DTS parameters before it outputs the DTS.

  The GPIB command to start the DTS is GFDTune:DOWNlink:TSEQuence:STARt .

• DTS Stop

  This parameter stops the transmission of the DTS. This parameter is applied only if the test set is transmitting a DTS.

  The GPIB command to stop the DTS is GFDTune:DOWNlink:TSEQuence:STOP .

• Burst Type (per timeslot)

  This parameter sets the burst type of the DSSs in a per timeslot manner.

  The available bust type settings are listed below.

  1. Off ( OFF ) - No burst transmitted.
  2. Frequency Correction Burst ( FCB ) - This is used by the mobile station for frequency synchronization. See 3GPP TS 45.002 version 7.4.0, subclause 5.2.4 for more information.
  3. Fixed Synchronization Burst ( FSB ) - This is used by the mobile station for time synchronization. The reduced frame number field is fixed to zero, the BCC and NCC fields use the normal Active Cell operating mode values. See 3GPP TS 45.002 version 7.4.0, subclause 5.2.5 for more information.
  4. Dynamic Synchronization Burst ( DSB ) -This is used by the mobile station for time synchronization. The reduced frame number field increments with each transmitted TDMA frame. If more than one DSB is specified in a TDMA frame, the TDMA frame number is the same for all DSBs. See 3GPP TS 45.002 version 7.4.0, subclause 5.2.5 for more information.
  5. Dummy ( DUMMY ) - This is used to pad timeslots on the BCH to ensure that the BCH has a constant power level. Note that the test set will measure a report results on these "dummy" bursts, and you must simply discard or ignore these data points. See 3GPP TS 45.002 version 7.4.0, subclause 5.2.6 for more information.
  6. GMSK PRBS ( PRBS ) - This is a GMSK burst containing a valid midamble and PRBS data.

  The GPIB command to set/query this parameter on a per DTS basis is GFDTune:DOWNlink:TSEQuence:BURSt:TYPE:TSLot<0|1|2|3|4|5> .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:BURSt:TYPE:TSLot<0|1|2|3|4|5> .

• Configure the Power Level for a DTS

  The DTS can not output more than four different power levels due to hardware limitation. The four available power levels are referred to as PL1 to PL4. You can set the power level of PL1 to PL4 with the DTS Power Level parameter.

  Each DSS can be configured to allocate the available power levels across a TDMA frame in two ways - either use the same power level (PL1 to PL4) for all timeslots in the frame or MIXED where each timeslot is allocated a power level that is fixed for the duration of the test sequence. This is done by setting the Frame Power Level Allocation parameter.

• DTS Power Level

  This parameter specifies the power levels that can be used in the DSSs of a DTS. The test set can generate four different power levels, (PL1, PL2, PL3, and PL4), in a DTS. The power levels of the active bursts in the DSSs can vary between these four power level settings. Each power level setting must be in the range of -160 dBm to +40 dBm.

  The command to set/query this parameter is GFDTune:DOWNlink:TSEQuence:PLEVel<1|2|3|4> .

• Frame Power Level Allocation

  This parameter specifies the method used to allocate the available power levels across a TDMA frame. The two methods are:

  • PLX(PL1, PL2, PL3, PL4) - all timeslots in the frame are fixed to Power Level X (PL1, PL2, PL3, PL4). This mode allows for additional flexibility in defining sequence steps that output synchronization pulses used for synchronizing a receiver test.
  • MIXed - the timeslots can be set to any of the four specified Power Levels ( PL1, PL2, PL3 , or PL4 ).

  The command to set/query this parameter on a per DTS basis is GFDTune:DOWNlink:TSEQuence:PLEVel:FRAMe .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:PLEVel:FRAMe .

• Power Levels per Timeslot

  This parameter specifies the power level for timeslot<n> for all the DSSs. These settings are only applied if the Frame Power Level Allocation is set to MIXed .

  The GPIB command to set/query this parameter is GFDTune:DOWNlink:TSEQuence:PLEVel:TSLot<0|1|2|3|4|5> .

  The following table gives an example of DTS power level allocation.

  Step	Power Level Allocation	TS0	TS1	TS2	TS3	TS4	TS5	TS6	TS7
  1	PL1	PL1	PL1	PL1	PL1	PL1	PL1
  2	MIXED	PL1	PL2	PL3	PL4	PL3	PL2
  3	MIXED	PL1
  4	MIXED	PL1	PL2
  5	MIXED	PL1	PL2	PL3
  6	MIXED	PL1	PL2	PL3	PL4
  7	PL3	PL3	PL3	PL3	PL3
  8	MIXED	PL1	PL2	PL3	PL4	PL3
  9	MIXED	PL1	PL2	PL3	PL4	PL3	PL2
  10	MIXED	PL1	PL2	PL3	PL4	PL3	PL2

  The programming for the above power level allocation is:

  "*** Set DTS power level Allocation ***"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:FRAM PL1,MIX,MIX,MIX,MIX,MIX,PL3,MIX,MIX,MIX"
  "*** Set DTS power level ***"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV1 -50"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV2 -60"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV3 -70"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV4 -80"
  "*** Set DTS Power Levels for TS1 through TS5 ***"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL0 PL1"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL1 PL2"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL2 PL3"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL3 PL4"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL4 PL3"
  OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL5 PL2"

• DTS Frequency

  This parameter sets the frequency of the DSSs in a DTS. The frequency settings in a DTS must be in the same band. The frequency bands are divided as follows:

  Downlink Frequency Bands

  Downlink Frequency Band	Frequency Range (MHz)	GSM Band Coverage
  Band 1	400 to 630	GSM450, GSM480
  Band 2	630 to 1000	GSM750, GSM850, GSM900, TGSM810
  Band 3	1550 to 2400	DCS1800, PCS1900

  The GPIB command to set/query this parameter on a per DTS basis is GFDTune:DOWNlink:TSEQuence:FREQuency .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:FREQuency .

• Repeat Count

  This parameter specifies the number of times a specific DSS is repeated in the DTS before proceeding to the next DSS.

  The GPIB command to set/query this parameter on a per DTS basis is GFDTune:DOWNlink:TSEQuence:REPeat .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:REPeat .

• Trigger Frame

  This parameter sets the frame of each DTS Step in a DTS in which the DTS will generate a trigger output. This parameter only applies to a DSS if the Trigger State is enabled for that DSS. Also, this setting must be less than or equal to the corresponding Repeat Count value in order for the trigger event to occur. This setting, along with the Trigger Timeslot setting determines the time at which the trigger event occurs for a particular DSS.

  The command to set/query this parameter on a per DTS basis is GFDTune:DOWNlink:TSEQuence:TRIGger:FRAMe .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:TRIGger:FRAMe .

• Trigger StateThis parameter set/query the state to the trigger for each DTS Step in a DTS. If this parameter is enabled for a particular DSS, the trigger event occurs at a time specified by the Trigger Frame and Trigger Timeslot .

  The command to set/query this parameter on a per DTS is GFDTune:DOWNlink:TSEQuence:TRIGger:STATe .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:TRIGger:STATe .

• Trigger Timeslot

  This parameter sets the timeslot in which the trigger event should occur for each DTS Step of a DTS. This parameter is only applied if the Trigger State is enabled for that DSS. This setting, along with the Trigger Frame setting determines the time at which the trigger event occurs for a particular DSS.

  The command to set/query this parameter on a per DTS is GFDTune:DOWNlink:TSEQuence:TRIGger:TSLot .

  The GPIB command to set/query this parameter for a specified range of DSSs is GFDTune:DOWNlink:SSTep:TRIGger:TSLot .

UTS Parameters

UTS parameters are used to define the USSs and the transmission behavior of a UTS.

• UTS Step Count

  This parameter specifies the number of USSs that are in the UTS.

  The GPIB command to set this parameter is GFDTune:UPLink:TSEQuence:SSTep[:COUNt] .

• UTS Burst Count

  This parameter specifies the number of active burst that are in each USS. (This number is the same for all USSs.) This setting is only applicable when the operating mode is Fast Device Tune . Also, the maximum number of uplinks depends on the number of uplinks supported by a particular measurement. If a measurement does not support the number of uplinks specified by this parameter, the test set returns integrity indicator 13.

  The GPIB command to set this parameter is GFDTune:UPLink:TSEQuence:BURSt:COUNt .

• UTS Burst State

  This parameter specifies whether an uplink burst is transmitted in the uplink sequence step. You can get discontinuously uplink burst transmission by setting this parameter. When the state for an uplink burst is set to ON , the burst will be transmitted, otherwise it will not be transmitted. you can specifies the state of Burst 1 to 7 for each uplink sequence step. Note, the state of Burst 1 can only be set to ON .

  The GPIB command to set this parameter on a per UTS basis is GFDTune:UPLink:TSEQuence:BURSt1|2|3|4|5|6|7:STATe .

• UTS Frequency

  This parameter sets the frequency of each USS. All frequency settings in an UTS must be in the same band. These frequency bands are divided as follows:

  Uplink Frequency Bands

  Uplink Frequency Band	Frequency Range (MHz)	GSM Band Coverage
  Band 1	292.5 to 645.5	GSM450, GSM480
  Band 2	645.5 to 1395.5	GSM750, GSM850, GSM900, TGSM810
  Band 3	1395.5 to 2700	DCS1800, PCS1900

  The GPIB command to set this parameter on a per UTS basis is GFDTune:UPLink:TSEQuence:FREQuency .

  The GPIB command to set/query this parameter for a specified range of USSs is GFDTune:UPLink:SSTep:FREQuency .

Receiver Calibration

The receiver calibration can be done by commanding the test set to transmit the DTS and let the mobile to measure on. The following constrains apply when configuring a DTS.

• All the TDMA frames within a DSS must be at the same frequency. Further, all the DSSs in a DTS must be in the same frequency band. See DTS Frequency for information about frequency band.
• The maximum number of DSSs in a DTS is 50.
• The maximum number of active bursts allowed per downlink TDMA frame is 6.
• The test set can not output more than four power levels in each DSS.
• The repeat count for a DSS can not exceed 1000.

DTS Example: Five DSSs with a total of 15 TDMA Frames

The figure above shows an example DTS. In this example, the setting for the DSS Repeat Count outputs the first DSS 10 times before moving on to the next DSS. The 2nd, 3rd, and 4th DSSs are sent once, and the 5th DSS is sent twice. The total number of frames transmitted in the DTS is 15.

To configure the test set to transmit the above waveform, set the following:

1. Set the operating mode to Fast Device Tune
   OUTPUT Testset;"CALL:OPER:MODE FDT"
2. DTS Step Count = 5
   OUTPUT Testset;"GFDT:DOWN:TSEQ:SST 5"
3. DTS Power Level Allocation = "PL1, MIXed, MIXed, MIXed, MIXed"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:FRAM PL1,MIX,MIX,MIX,MIX"
4. DTS Power Levels (PLs) in dBm.
   DTS PL1 = -50
   DTS PL2 = -60
   DTS PL3 = -70
   DTS PL4 = -80
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV1 -50
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV2 -60
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV3 -70
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV4 -80
5. DTS Power Levels for Timeslot 1 (TS1) through Timeslot 5 (TS5). (Note: The Power Levels for all the timeslots in DSS1 are fixed at PL1.)
   DTS Power Levels for TS0 = PL1
   DTS Power Levels for TS1 = PL2
   DTS Power Levels for TS2 = PL3
   DTS Power Levels for TS3 = PL4
   DTS Power Levels for TS4 = PL3
   DTS Power Levels for TS5 = PL2
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL0 PL1
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL1 PL2
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL2 PL3
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL3 PL4
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL4 PL3
   OUTPUT Testset;"GFDT:DOWN:TSEQ:PLEV:TSL5 PL2
6. DTS Frequency (in MHz) for each step.
   DTS Frequency = "800MHz, 850MHz, 900MHz, 950MHz, 1000MHz"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:FREQ 800Mhz,850MHz,900MHz,950MHz,1000MHz"
7. DTS Repeat Count for each step.
   DTS Repeat Count = "10, 1, 1, 1, 2"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:REP 10,1,1,1,2"
8. DTS Burst Type for Timeslot 1 (TS1) through Timeslot 5 (TS5).
   DTS Burst Type for TS0 ="FCB, FSB, FSB, FSB, PRBS"
   DTS Burst Type for TS1 ="DUMMY, PRBS, PRBS, PRBS, PRBS"
   DTS Burst Type for TS2 ="DUMMY, PRBS, PRBS, PRBS, PRBS"
   DTS Burst Type for TS3 ="DUMMY, PRBS, PRBS, PRBS, PRBS"
   DTS Burst Type for TS4 ="DUMMY. OFF, OFF, OFF, PRBS"
   DTS Burst Type for TS5 ="DUMMY. OFF, OFF, OFF,PRBS"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:BURS:TYPE:TSL0 FCB,FSB,FSB,FSB,PRBS"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:BURS:TYPE:TSL1 DUMMY,PRBS,PRBS,PRBS,PRBS"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:BURS:TYPE:TSL2 DUMMY,PRBS,PRBS,PRBS,PRBS"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:BURS:TYPE:TSL3 DUMMY,PRBS,PRBS,PRBS,PRBS"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:BURS:TYPE:TSL4 DUMMY,OFF,OFF,OFF,PRBS"
   OUTPUT Testset;"GFDT:DOWN:TSEQ:BURS:TYPE:TSL5 DUMMY,OFF,OFF,OFF,PRBS"
9. Start the transmission of DTS is the mobile is ready.
   OUTPUT Testset;"GFDT:DOWN:TSEQ:STAR"
10. Stop the transmission of DTS if needed when transmitting.
    OUTPUT Testset;"GFDT:DOWN:TSEQ:STOP"

The MUI screen displays the DTS configuration after sending the above GPIB commands. You can start/stop the DTS transmission by pressing the start/stop downlink button in the front panel instead.

Transmitter Calibration

The transmitter calibration can be done by commanding the mobile to transmit the UTS and let the test set to measure on. Currently, the transmit power measurement is the only measurement that can be made on UTS. Before making the transmitter calibration, you should set the UTS parameters and transmit power parameters. See Fast Device Tune Capable Measurement for information about how to set the transmit power parameters in Fast Device Tune operating mode.

The following constrains apply when configuring an UTS.

• All the TDMA frames within a USS must be at the same frequency. Further, all the USSs in a UTS must be in the same frequency band. See UTS Frequency for information about frequency band.
• The maximum number of USSs in an UTS is 50
• The repeat count for a USS can not exceed 1000.

• Before transmitting the UTS, the mobile station needs to make sure that the test set's hardware has been ready to receive the input RF signal. An Arm State is specified in each GFDT capable measurement for this purpose. You can query the Arm State of the test set using the query only GPIB command of each specific GFDT capable measurement.

• The number of TDMA frames in a USS should be know by the mobile before transmitting the UTS. For this reason, all the Fast Device Tune capable measurements have a query only parameter called Uplink Frames per Step . The parameter reports the number of TDMA frames required in an USS. The value of this parameter depends on the measurement settings. In the transmit power measurement, the number of TDMA frames in an USS depends on the parameter Auto Range to Highest Burst and Multi-Measurement Count . See the following table for more details.

  Multi-Measurement State	Auto Range To Highest Burst	The number of TDMA frames in an USS
  OFF	ON	4
  OFF	OFF	2
  ON	ON	Multi-Meas Count × 2 + 2 *
  ON	OFF	Multi-Meas Count × 2 **
  * The mobile transmits 4 TDMA frames in the first USS, then transmits 2 TDMA frames in the following repeated USSs. ** The mobile transmits 2 TDMA frames in each repeated USS.

• The maximum number of active bursts allowed per uplink TDMA frame in the transmit power measurement is 7.
• For the transmit power measurement, the first burst in each TDMA frame must have the highest power and should be higher than -14dBm.

UTS Example: Five USSs with a total of 10 TDMA Frames

The figure above shows an example UTS.

To configure a GFDT capable measurement using the above waveform, set the following:

1. Set the operating mode to Fast Device Tune
   OUTPUT Testset;"CALL:OPER:MODE FDT"
2. UTS Step Count = 5
   OUTPUT Testset;"GFDT:UPL:TSEQ:SST 5"
3. UTS Burst Count = 7
   OUTPUT Testset;"GFDT:UPL:TSEQ:BURS:COUN 7"
4. Set Expected Power Control to Manual , set the expected power for the highest burst.
   OUTPUT Testset;"RFAN:MAN:POW:BURST1 30"
5. Set Modulation Format Control to Manual , set the expected modulation format (GMSK or 8PSK) for each uplink burst individually.
   OUTPUT Testset;"CALL:MOD:MAN:BURST1 GMSK"
   OUTPUT Testset;"CALL:MOD:MAN:BURST2 GMSK"
   OUTPUT Testset;"CALL:MOD:MAN:BURST3 GMSK"
   OUTPUT Testset;"CALL:MOD:MAN:BURST4 GMSK"
   OUTPUT Testset;"CALL:MOD:MAN:BURST5 GMSK"
   OUTPUT Testset;"CALL:MOD:MAN:BURST6 GMSK"
   OUTPUT Testset;"CALL:MOD:MAN:BURST7 GMSK"
6. UTS Frequency (in MHz) for each USS.
   UTS Frequency = "800MHz, 850MHz, 900MHz, 950MHz, 1000MHz"
   OUTPUT Testset;"GFDT:UPL:TSEQ:FREQ 800MHz,850MHz,900MHz,950MHz,1000MHz"
7. Configure the Fast Device Tune capable measurement as you need.
   OUTPUT Testset;"SET:TXP:COUN:STAT OFF" !Sets the multi measurement to OFF
   OUTPUT Testset;"SET:TXP:RANG:AUTO OFF" !Sets the Auto Range to OFF
   OUTPUT Testset;"SET:TXP:TIM:STIM 10" !Sets timeout value
   OUTPUT Testset;"SET:TXP:TRIG:DEL 0ms" !Sets the trigger delay
8. Query uplink frames per USS.

   OUTPUT Test_set;"SETup:TXPower:SSTep:FRAMes?"

9. Configure mobile station for correctly transmitting UTS
10. Initiate the GFDT capable measurement. This example uses the Transmit Power Measurement.

    OUTPUT Test_set;"INITiate:TXPower"

11. Query the Arm State of Test set. The test set needs about 2 second to arm.

    OUTPUT Test_set;"INITiate:TXPower:GFDTUNe:ARMed?"

12. If the test set is ready to receive input RF signals, trigger mobile station to transmit UTS.