Test Mode Operating Modes

Expected Burst

This parameter is only used when the test set's operating mode is set to a test mode. The expected burst type should be set when in one of the test modes with the CALL:BURSt:TYPE command. If it is not set, the test set may not synchronize to the input signal's midamble.

A TCH can have one of eight midamble patterns. These patterns are called Training Sequence Codes (TSC). The Expected Burst parameter allows you to set the test set to expect a certain midamble pattern (TSC0 through TSC7) from the mobile. Alternatively, selecting RACH for this parameter allows you to set the test set to expect the special midamble pattern used by a RACH burst.

For details on the GPIB command, see CALL:BURSt . (If you are using the test set manually, you can set the Expected Burst by pressing Receiver Control ( F12 ) on the Call Setup screen.)

 
OUTPUT 714;"CALL:BURST:TYPE TSC5" !Sets the test set to expect a TCH with midamble
    !pattern TSC5.

See Receiver Control for more information.

GSM BCH

• The test set generates a BCH without a TCH. BCH configuration and timeslot configuration are the same as when the operating mode is set to active cell.
• Cell power is set using the CALL:POWer command.
• By default, the test set expects the mobile station to transmit on the uplink BCH. The test set's receiver frequency can be set manually, which de-couples the automatic setting.
• Changes to the mobile station TX level will couple to the expected power, and the mobile station TX Level parameter will be transmitted on the downlink BCCH.
• All measurements are available to you as if the operating mode was set to active mode.

1. Select GSM BCH test mode (GBTest).

    
   OUTPUT 714;"CALL:OPERATING:MODE GBTest"

2. Select PGSM as the broadcast band.

    
   OUTPUT 714;"CALL:CELL:BAND PGSM"

3. Configure the receiver control to auto.

    
   OUTPUT 714;"RFANALYZER:CONTROL:AUTO ON"

4. Set the BCH to channel 21.

    
   OUTPUT 714;"CALL:BCH:PGSM 21"

5. Set the mobile station TX level to 12.

    
   OUTPUT 714;"CALL:MS:TXLEVEL 12"

6. To make the measurement, set up the mobile station to transmit on PGSM channel 21 at a power level of 12.

1. Select GSM BCH test mode.

    
   OUTPUT 714;"CALL:OPERATING:MODE GBTest"

2. Select PGSM as the broadcast band.

    
   OUTPUT 714;"CALL:CELL:BAND PGSM"

3. Set the BCH to channel 21.

    
   OUTPUT 714;"CALL:BCH:PGSM 21"

4. Configure the receiver control to manual.

    
   OUTPUT 714;"RFANALYZER:CONTROL:AUTO OFF"

5. Configure the test set's receiver frequency to 895 MHz.

    
   OUTPUT 714;"RFANALYZER:MANUAL:MEASUREMENT:FREQUENCY 895 MHZ"

6. Set the receiver's power level to 14 dBm.

    
   OUTPUT 714;"RFANALYZER:MANUAL:POWER:BURST1 14 DBM"

7. To make the measurement, set up the mobile station to transmit at 895 MHz and at a power level of 14 dBm.

GSM BCH+TCH

• The test set generates BCH+TCH on the downlink path. The BCH+TCH burst modulation is the same as when the operating mode is set to active cell.
• Cell power is set using the CALL:POWer command.
• Manually synchronizing the mobile station to the BCCH is not under direct control of the test set. You are responsible for this synchronization.
• Changes to the TCH timeslot and TCH ARFCN will reconfigure the downlink (although no channel assignment signaling will take place).
• By default, the test set's receiver is configured to receive the mobile station's signal at the TCH uplink frequency. The test set's receiver frequency can be set manually, which decouples the automatic setting.
• Changes to the mobile station TX level will couple to the expected power, and the mobile station TX Level parameter will be transmitted on the downlink BCCH and SACCH.
• Changes to TCH timing advance will also appear on the downlink SACCH. Whether the mobile station makes use of these parameters is a function of the mobile station.
• All measurements are available to you, the same as if the operating mode was active mode.

1. Select GSM BCH+TCH test mode.

    
   OUTPUT 714;"CALL:OPERATING:MODE GBTTest"

2. Configure the receiver control to auto.

    
   OUTPUT 714;"RFANALYZER:CONTROL:AUTO ON"

3. Set the BCH to channel 21.

    
   OUTPUT 714;"CALL:BCH:PGSM 21"

4. Set the TCH to channel 31.

    
   OUTPUT 714;"CALL:TCH:PGSM 31"

5. Set the mobile station TX Level to 12.

    
   OUTPUT 714;"CALL:MS:TXLEVEL 12"

6. To make the measurement, set the mobile station to transmit on PGSM channel 31 at a power level of 12.

CW

When the test set's downlink function is set to CW, the test set operates like a signal generator with level and frequency controls. The Call Parms selections change from Cell Power to RF Gen Power, from Cell Band to RF Gen Band, from Broadcast Chan to RF Gen Channel. The CW setting also gives you the opportunity to set output frequency using the RF Gen Freq parameter.

• The test set generates an unmodulated CW downlink signal.
• The RF generator's power is set using the CALL[:CELL]:POWer[:SAMPlitude]:CW command.
• The downlink frequency is controlled by the RF Gen Freq field. The RF generator's frequency is set using the CALL[:CELL]:RFGenerator:FREQuency[:SELected] command, in this mode the user has direct control of the output frequency without making a channel selection.
• By default, the test set's receiver is configured to receive the mobile station's signal at the current RF generator channel setting. The test set's receiver frequency can be set manually, which decouples the automatic setting. See RFANalyzer:MANual:MEASurement[:MFRequency] .
• No uplink demodulation or channel decoding is available. BER and uplink audio measurements will not return any results.

GPRS BCH

When Cell Operating Mode is set to "GPRS BCH" (PBTest) test mode operating mode, the base station emulator produces the BCH but does not attempt to demodulate the uplink. Non-functional features (for example, "Start Data Connection") of the BS Emulator do not result in an execution error.

GPRS BCH+PDTCH

When Cell Operating Mode is set to "GPRS BCH + PDTCH" (PBPTest) test mode operating mode, the base station emulator produces the BCH and PDTCH. To specify the positions of the PDTCH use CALL:(PDTCH|PDTChannel)[:ARFCn][:SELected] and CALL:(PDTCH|PDTChannel):MSLot:CONFig . The locations of the specified uplink are demodulated but no signaling for control of a data connection is performed and PRACH bursts are not demodulated.

In this mode the following features are available:

• Generation of BCH + PDTCH on the downlink.
• If you manually synchronize the mobile station with the BCH, and then turn on the mobile station's own PDTCH, and both uplink and downlink use the same ARFCN and timeslot(s), what is sometimes known as a "forced" call is in progress. Demodulation and channel decoding of the uplink are available, although no messages are decoded.
  
  Manually synchronizing the mobile station to the BCH is usually initiated from the mobile station keypad, or over a special mobile station test bus. This is not under the direct control of the base station emulator and is your responsibility.
• When a "forced" call is in progress (as defined above), BER and BLER measurements can be made.
• Changes to the Multislot Configuration or PDTCH ARFCN [PDTCH Band] reconfigure the downlink (although no channel assignment signalling takes place). The BS Emulator's receiver is configured to receive at the modified frequency, timeslot and timing advance in the same way as when Cell Operating Mode is set to "Active Cell" (CELL).

GPRS BCH+PDTCH+TCH

This operating mode supports Dual Transfer Mode (DTM) operation to allow for mobile station receiver testing on adjacent timeslots which use GMSK modulation. The PDTCH channel parameters indirectly control certain TCH parameters. Therefore, some parameters are unavailable in this operating mode. For details on which commands are unavailable, see Commands Disabled During Dual Transfer Mode Operation

Fast Device Tune

See Fast Device Tune .

Cell Off

If you set Cell Operating Mode "OFF" it causes the following actions:

• If Cell Operating Mode was currently using CALL:OPERating OFF, the setting is ignored and the operation is assumed to have successfully completed immediately.
• If a mobile station is attached or a data connection is in progress, no attempt is made to use over-the-air signaling to disconnect or detach.
• All signaling operations, uplink demodulation and downlink (BCH, and PDTCH) generation are stopped.
• There is no RF power output.

Expected Burst

This parameter is only used when the test set's operating mode is set to "GPRS BCH" (PBTest) or "GPRS BCH + PDTCH" (PBPTest). When operating mode is set to Active Cell, the test set automatically selects the correct burst type.

A PDTCH can have one of eight midamble patterns. These patterns are called Training Sequence Codes (TSC). The Expected Burst parameter allows you to set the test set to expect a certain midamble pattern (TSC0 through TSC7) from the mobile. Alternatively, selecting RACH for this parameter allows you to set the test set to expect the special midamble pattern used by a RACH burst.

For details on the GPIB command, see CALL:BURSt . (If you are using the test set manually, you can set the Expected Burst by pressing Receiver Control ( F12 ) on the Call Setup screen.)

 
OUTPUT 714;"CALL:BURST:TYPE TSC5" !Sets the test set to expect a TCH with midamble
    !pattern TSC5.

See Receiver Control for more information.

RLC/MAC Header State

This parameter is only used when the test set's operating mode is set to "GPRS BCH + PDTCH" (PBPTest).

The RLC/MAC header state parameter allows you to select whether or not a valid Radio Link Control (RLC)/Medium Access Control (MAC) header is present on the downlink PDTCH burst(s):

• If the RLC/MAC header state is set to OFF, all 53 octets (for CS4 encoding, for other coding schemes the number of octets will be less) in the burst are filled with PRBS data.
• If the RLC/MAC header state is set to ON, the first 3 octets in the burst contain a valid RLC/MAC header indicating the burst sequence number and the power reduction value. The remaining 50 octets (for CS4 encoding, for other coding schemes the number of octets will be less) in the burst are filled with PRBS data.

If the RLC/MAC header state is changed when the operating mode is any mode other than GPRS BCH+PDTCH, the setting is remembered until GPRS BCH+PDTCH is next used.

For details on the GPIB command, see CALL:PBPTest:RLCMac[:HEADer]:STATe . (If you are using the test set manually, the RLC/MAC Header field is in the Call Parms window, screen 2 of 3, F10).

 
OUTPUT 714;"CALL:PBPTest:RLCMac:HEADer:STATe ON" !Enables the RLC/MAC header.

EGPRS BCH

When Cell Operating Mode is set to "EGPRS BCH" (EBTest) test mode operating mode, the base station emulator produces the BCH but does not attempt to demodulate the uplink. Non-functional features (for example, "Start Data Connection") of the BS Emulator do not result in an execution error.

EGPRS BCH + PDTCH

When Cell Operating Mode is set to "EGPRS BCH + PDTCH" (EBPTest) test mode operating mode, the base station emulator produces the BCH and PDTCH. To specify the positions of the PDTCH use CALL:(PDTCH|PDTChannel)[:ARFCn][:SELected] and CALL:(PDTCH|PDTChannel):MSLot:CONFig . The locations of the specified uplink are demodulated but no signaling for control of a data connection is performed and PRACH bursts are not demodulated.

In this mode the following features are available:

• Generation of BCH + PDTCH on the downlink.
• If you manually synchronize the mobile station with the BCH, and then turn on the mobile station's own PDTCH, and both uplink and downlink use the same ARFCN and timeslot(s), what is sometimes known as a "forced" call is in progress. Demodulation and channel decoding of the uplink are available, although no messages are decoded.
  
  Manually synchronizing the mobile station to the BCH is usually initiated from the mobile station keypad, or over a special mobile station test bus. This is not under the direct control of the base station emulator and is your responsibility.
• When a "forced" call is in progress (as defined above), BER and BLER measurements can be made.
• Changes to the Multislot Configuration or PDTCH ARFCN [PDTCH Band] reconfigure the downlink (although no channel assignment signalling takes place). The BS Emulator's receiver is configured to receive at the modified frequency, timeslot and timing advance in the same way as when Cell Operating Mode is set to "Active Cell" (CELL).

EGPRS BCH + PDTCH + TCH

This operating mode supports Dual Transfer Mode operation to allow for mobile station receiver testing on adjacent timeslots which use different channel coding and potentially different modulation. The PDTCH channel parameters indirectly control certain TCH parameters. Therefore, some parameters are unavailable in this operating mode. For details on which commands are unavailable, see Commands Disabled During Dual Transfer Mode Operation .

OFF Behavior

If you set Cell Operating Mode "OFF" it causes the following actions:

• If Cell Operating Mode was currently using CALL:OPERating OFF, the setting is ignored and the operation is assumed to have successfully completed immediately.
• If a mobile station is attached or a data connection is in progress, no attempt is made to use over-the-air signaling to disconnect or detach.
• All signaling operations, uplink demodulation and downlink (BCH, and PDTCH) generation are stopped.
• There is no RF power output.

Expected Burst

This parameter is only used when the test set's operating mode is set to "EGPRS BCH" (EBTest) or "EGPRS BCH + PDTCH" (EBPTest). When operating mode is set to Active Cell, the test set automatically selects the correct burst type.

A PDTCH can have one of eight midamble patterns. These patterns are called Training Sequence Codes (TSC). The Expected Burst parameter allows you to set the test set to expect a certain midamble pattern (TSC0 through TSC7) from the mobile. Alternatively, selecting RACH for this parameter allows you to set the test set to expect the special midamble pattern used by a RACH burst.

For details on the GPIB command, see CALL:BURSt . (If you are using the test set manually, you can set the Expected Burst by pressing Receiver Control ( F12 ) on the Call Setup screen.)

 
OUTPUT 714;"CALL:BURST:TYPE TSC5" !Sets the test set to expect a TCH with midamble
    !pattern TSC5.

See Receiver Control for more information.

RLC/MAC Header State

This parameter is only used when the test set's operating mode is set to "EGPRS BCH + PDTCH" or "EGPRS BCH + PDTCH+TCH" .

The RLC/MAC header state parameter allows you to set :

• If the RLC/MAC header state is set to Downlink, it means entirely looped back downlink header the same as constructed by the RLC/MAC layer of test set and simply turned round by the phone on a burst by burst basis.
• If the RLC/MAC header state is set to uplink, it means the header constructed by the phone's RLC/MAC layer.

For details on the GPIB command, see CALL:EBPTest:EXPected:RLCMac[:HEADer] .