Programming an Access Probe Power Measurement

Last updated: October 28, 2004

This section provides an example of how to make access probe power measurements via GPIB.

The following program example assumes that the mobile station's antenna output is connected to the RF IN/OUT connector, and the mobile station has found service.

The basic procedure to measure access probe power remotely is:

Turn the access probe power measurement timeout timer on using the SETup:CAPPower:TIMeout:STATe command. If the timeout timer is not turned on, and an access probe is not received, the measurement will hang on the FETCh? command indefinitely. Use the "FETCh:CAPPower[:ALL]?" command to obtain the measurement results.
Turn on the mobile station and perform a registration (wait for power-on or send CALL:REGister[:IMMediate] ).
Turn off timer-based registrations (see CALL:REGister:TIMer:STATe ).
Set the trigger arm state to single (see SETup:CAPPower:CONTinuous ).

NOTE

Continuous trigger arming can also be used to measure access probe power sequences, however single triggering allows program counters to synchronize with mobile station transmitted power steps. This is important if you want measurement triggering to stop when an access probe sequence has completed.

Turn call limit on (see CALL:CONNected:LIMit[:STATe]<[:SELected]|:TA2000> ).
Set up initial power, step size, number of steps, and the maximum number of access probes for requests and responses (see CALL:APARameter ).
Perform a page or mobile station originated call.
Initiate the access probe power measurement using the INITiate<:measurement mnemonic>[:ON] . The <measurement mnemonic> for access probe power measurements is CAPP.
Use the FETCh:CAPPower[:ALL]? command to obtain the measurement results.
Repeat steps 8 and 9 for each power step.

IMPORTANT

Return the trigger arm to single state before attempting a different measurement or attempting any call processing procedure.

Programming Example

 
10 !RE-SAVE "c:\roadhog\programs\acc_probe.txt"
20    !This program measures an access probe sequence
30    !See "Access Probe Output Power" in TIA/EIA-98-E for specifications and standards
40    CLEAR SCREEN
50    A=714
60    !***Specify call parameters***
70    Systype$="DIGITAL2000"
80    Band$="USCELLULAR"
90    Channel=384
100   Sid=1
110   Nid=1
120   Radio_config$="F3R3"
130   Service_opt$="SO2"
140   !
150   !***Specify test parameters***
160   Loss_frequency$="836 MHZ,881 MHZ"
170   Expected_loss$="-2,-2"
180   Acc_prb_steps=3
190   Acc_prb_size=4
200   Ior=-90
210   Pilot=-7
220   Paging_ch=-12
230   Sync=-16
240   Traffic=-15.5
250   !
260   ON TIMEOUT 7,20 CALL Timeout
270   OUTPUT A;"SETUP:CAPP:TIMEOUT:STIME 3 S"
280   OUTPUT A;"SYST:COMM:GPIB:DEB:STAT ON"
290   !
300   !***Set up path loss***
310   OUTPUT A;"SYSTEM:CORRECTION:SFREQUENCY ";Loss_frequency$
320   OUTPUT A;"SYSTEM:CORRECTION:SGAIN ";Expected_loss$
330   !
340   !***Set up access/paging parameters***
350   OUTPUT A;"CALL:OPER:MODE CALL"
360   OUTPUT A;"CALL:BAND ";Band$
370   OUTPUT A;"CALL:CHAN ";Channel
380   OUTPUT A;"CALL:POW -50"
390   OUTPUT A;"CALL:SID ";Sid
400   OUTPUT A;"CALL:NID ";Nid
410   OUTPUT A;"CALL:RCON ";Radio_config$
420   OUTPUT A;"CALL:SOPTION ";Service_opt$
430   OUTPUT A;"CALL:PROT PREV6"
440   OUTPUT A;"CALL:PAG ";Paging_ch
450   OUTPUT A;"CALL:PAG:DRAT FULL"
460   OUTPUT A;"CALL:PIL ";Pilot
470   OUTPUT A;"CALL:SYNC ";Sync
480   OUTPUT A;"CALL:FCH ";Traffic
490   !
500   PRINT "Turn on mobile station...press continue when it has found service and registered"
510   PAUSE
520   CLEAR SCREEN
530   OUTPUT A;"CALL:REGISTER:TIMER:STATE OFF"
540   WAIT 2
550   !
560   !***Set up measurement parameters***
570   OUTPUT A;"SETUP:CAPP:CONTINUOUS OFF"
580   OUTPUT A;"CALL:CONNECTED:LIMIT 1"
590   OUTPUT A;"CALL:APARAMETER:POWER:STEP ";Acc_prb_size
600   OUTPUT A;"CALL:APARAMETER:POWER:STEP:COUNT ";Acc_prb_steps
610   !
620   !***Page the mobile station***
630   DISP "Paging mobile station..."
640   OUTPUT A;"CALL:ORIG"
650   DISP "Measuring Access probe power"
660   !
670   !***Obtain measurement results***
680   FOR I=1 TO Acc_prb_steps
690     OUTPUT A;"INITIATE:CAPP"
750     OUTPUT A;"FETCH:CAPP?"
760     ENTER A;Acp_integ,Acp
770     PRINT "Access probe ";I;" integrity = ";Acp_integ
780     PRINT "Access probe ";I;" power = ";Acp
790   NEXT I
800   DISP "Access probe measurements completed"
810   DISP "Test complete"
811   !
820   !***Return to default call processing states***
830   OUTPUT A;"CALL:END"
840   OUTPUT A;"CALL:CONNECTED:LIMIT 0"
850   OUTPUT A;"CALL:REGISTER:TIMER:STATE ON"
860   END
861   !
870 Timeout: SUB Timeout
880     PRINT "Program timed out"
890     CLEAR 7
900     CLEAR 714
910   SUBEND

Returned Values

This query returns an integrity indicator followed by a channel power measurement result (if results are available).

Programming an Access Probe Power Measurement

Programming Example

Returned Values

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