Programming a Block Error Measurement

Last updated: December 3, 2008

This measurement is not applicable to GSM.

This section provides an example of how to make the block error (BLER) measurement via GPIB.

The following procedure assumes that the Operating Mode has been set to Active Cell (using CALL:OPERating:MODE ) and the data connection type has been set to ETSI Type B or BLER (using CALL:FUNCtion:CONNection:TYPE ). In addition, it is assumed that a data connection has been established between the test set and the mobile station (that is, the connection status is Transferring). See Step 4: Make a Connection . Note that you can also make BLER measurements when the test set's operating mode is set to GPRS BCH+PDTCH test mode (see CALL:OPERating:MODE ).

Configure the BCH and PDTCH parameters using the CALL subsystem.
Configure the Block Error measurement parameters using the SETup subsystem.
Configure the downlink PDTCH parameters using the CALL subsystem.
Start the Block Error measurement using the INITiate subsystem.
Use the FETCh? command to obtain Block Error measurement results.

Programming Example

 
10   ! This code assumes that the current data connection state is Transferring.
20   !
30   ! Configure BCH and PDTCH parameters.
40   OUTPUT 714;"CALL:POW -50 DBM" ! Set the BCH power.
50   OUTPUT 714;"CALL:PDTCH:PZER:LEV 30" ! Set the P0 reference level to 30 dB.
60   OUTPUT 714;"CALL:PDTCH:MCSC MCS3" ! Set the modulation coding scheme to MCS3.
70   ! Configure the measurement parameters
80   OUTPUT 714;"SET:BLER:TIM:TIME 5" ! BLER measurement times out after
90                                    ! 5 seconds.
100  OUTPUT 714;"SET:BLER:CONT OFF" ! Configures a BLER measurement to
110                                 ! Single Trigger.
120  OUTPUT 714;"SET:BLER:COUN 2000"  ! Sets the number of blocks to measure
130                                   ! at 2,000.
140  OUTPUT 714;"SET:BLER:LDC:AUTO ON" ! Sets the Loopback Delay
150                                    ! Control mode to ON. This
160                                    ! commands the test set to
170                                    ! determine the Block Delay.
180  ! Set up and select the downlink PDTCH power reduction levels.
190  OUTPUT 714;"CALL:PDTCH:PRED:LEV1 12db"
200  OUTPUT 714;"CALL:PDTCH:PRED:LEV2 0dB"
210  OUTPUT 714;"CALL:PDTCH:PRED:BURS1 PRL1"
220  OUTPUT 714;"CALL:PDTCH:PRED:BURS2 PRL1"
230  OUTPUT 714;"INIT:BLER"  ! Start a BLER measurement.
240  REPEAT
250    OUTPUT 714;"INIT:DONE?"
260    ENTER 714;Meas_complete$
270  UNTIL Meas_complete$="BLER"
280  ! Fetch results.
290  OUTPUT 714;"FETC:BLER?"
300  ENTER 714;Integrity,Blocks_tested,Block_ratio,Block_err_cnt
310  END

Returned values

The measurements returned by this program are:

Integrity returns the Integrity Indicator (0 means a successful measurement with no errors).
Blocks_tested returns the number of blocks tested.
Block_ratio returns the ratio of block errors to total blocks tested.
Block_err_cnt returns the number of block errors.

Programming a Block Error Measurement

Programming Example

Returned values

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