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 ).
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
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.