The operating mode changes the way in which the test set interacts with the mobile station. Active cell operating mode is the default setting and is used when emulating a normal GSM, GPRS, or EGPRS cell. You use one of the test set's test mode operating modes when it is not possible, or not desired, to communicate using over-the-air signalling with the mobile station, but downlink stimulus and uplink measurements are still needed.
Refer to the following sections for more details on each test mode operating mode:
If you require details on active cell operating mode for GSM or GPRS, see Active Cell Operating Mode .
Active cell mode is the default operating mode and is used when emulating a normal GSM cell. When a GSM test mode is selected (GBTest or GBTTest), the choices of downlink stimulus, selected by Operating Mode, are:
See CALL:FUNCtion for test function GPIB syntax.
When the test set's operating mode is a GSM test mode:
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.
The following example shows how to set up a test mode measurement using the GSM BCH test operating mode. In this example the test set is configured to transmit a BCH on PGSM channel 21, and receive the mobile station on PGSM channel 21 at a power level of 12.
OUTPUT 714;"CALL:OPERATING:MODE GBTest"
OUTPUT 714;"CALL:CELL:BAND PGSM"
OUTPUT 714;"RFANALYZER:CONTROL:AUTO ON"
OUTPUT 714;"CALL:BCH:PGSM 21"
OUTPUT 714;"CALL:MS:TXLEVEL 12"
The following example shows how to set up a GSM test mode measurement using the GSM BCH operating mode. In this example the test set is configured to transmit a BCH on PGSM channel 21. Manual receiver control is used to configure the test set to measure a signal from the mobile station at 895 MHz and 14 dBm.
OUTPUT 714;"CALL:OPERATING:MODE GBTest"
OUTPUT 714;"CALL:CELL:BAND PGSM"
OUTPUT 714;"CALL:BCH:PGSM 21"
Configure the receiver control to manual.
OUTPUT 714;"RFANALYZER:CONTROL:AUTO OFF"
OUTPUT 714;"RFANALYZER:MANUAL:MEASUREMENT:FREQUENCY 895 MHZ"
OUTPUT 714;"RFANALYZER:MANUAL:POWER:BURST1 14 DBM"
The following example shows how to set up a GSM test mode measurement using the "GSM BCH + TCH" (GBTTest) test mode operating mode. In this example the test set is configured to transmit a BCH on PGSM channel 21, a TCH on PGSM channel 31, and receive the mobile station on PGSM channel 31 at power level 12.
OUTPUT 714;"CALL:OPERATING:MODE GBTTest"
OUTPUT 714;"RFANALYZER:CONTROL:AUTO ON"
OUTPUT 714;"CALL:BCH:PGSM 21"
OUTPUT 714;"CALL:TCH:PGSM 31"
OUTPUT 714;"CALL:MS:TXLEVEL 12"
The following example shows how to set up a GSM test mode measurement using the "GSM BCH+ TCH" (GBTTest) test mode operating mode. In this example the test set transmits a BCH on PGSM channel 21 and a TCH on PGSM channel 31. Manual receiver control is used to configure the test set to measure a signal from the mobile station at 895 MHz. Expected power is set at +14 dBm.
OUTPUT 714;"CALL:OPERATING:MODE GBTTest"
OUTPUT 714;"CALL:CELL:BAND PGSM"
OUTPUT 714;"CALL:BCH:PGSM 21"
OUTPUT 714;"CALL:TCH:PGSM 31"
OUTPUT 714;"RFANALYZER:CONTROL:MEASUREMENT:FREQUENCY:AUTO OFF" OUTPUT 714;"RFANALYZER:CONTROL:POWER:AUTO OFF"
OUTPUT 714;"RFANALYZER:MANUAL:MEASUREMENT:FREQUENCY 895 MHZ"
OUTPUT 714;"RFANALYZER:MANUAL:POWER:BURST1 14 DBM"
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.
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.
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:
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
If you set Cell Operating Mode "OFF" it causes the following actions:
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.
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 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.
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.
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:
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 .
If you set Cell Operating Mode "OFF" it causes the following actions:
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.
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 :
For details on the GPIB command, see CALL:EBPTest:EXPected:RLCMac[:HEADer] .
Configuring the Broadcast Channel (BCH)