Programming a RACH Measurement
Last updated: May 8, 2002
This section provides an example of how to make a power versus time measurement on a RACH. The same principles as used in this example can also be used for transmit power and phase and frequency error measurements.
Overview of Measurement Procedure
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Ensure that the mobile is switched off.
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Set the test set's measurement receiver to the frequency the RACH will arrive on. The simplest way to do this is to set the manual channel (that is, the expected ARFCN) to the ARFCN of the BCH. Alternatively you could set the expected frequency to the uplink frequency of the BCH ARFCN.
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Set triggering to single.
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Set trigger mode to Auto.
Once the RACH measurement is completed, in order to make further measurements on the TCH, ensure you reset the receiver control to Auto.
Only one measurement at a time can be made on the RACH even if two measurements are initiated.
Programming Example
The following example details how to make a power versus time RACH measurement on a mobile originated call in Active Cell mode.
Alternatively, the same measurement could be made on a base station originated call by replacing lines 160 and 170 with the CALL:ORIGinate command.
10 INTEGER Int
20 DIM Results(11)
30 REAL Mask,Power
40 OUTPUT 714;"*RST"
50 OUTPUT 714;"RFANALYZER:MANUAL:CHANNEL:SELECTED 20" !Configures the
60 !test set to expect a transmission on ARFCN 20.
70 OUTPUT 714;"RFANALYZER:EXPECTED:POWER:SELECTED 10 DBM" !Configures
80 !the test set to expect a power level of 10 dBm.
90 OUTPUT 714;"SETUP:PVTIME:CONTINUOUS OFF" !Configures trigger
100 !mode to single for a pvt measurement.
110 OUTPUT 714;"SETUP:PVTIME:COUNT:STATE OFF" !Configures the
120 !multi_measurement state to OFF.
130 OUTPUT 714;"SETUP:PVTIME:TRIGGER:SOURCE AUTO" !Configures the
140 !trigger source to AUTO.
150 OUTPUT 714;"INITIATE:PVTIME" !Start a pvt measurement.
160 PRINT "Connect your mobile to the Test Set and initiate a call"
170 PRINT "from the mobile."
180 OUTPUT 714;"FETCH:PVTIME:ALL?"!Fetches the measurement integrity
190 !value, mask indicator, tx power, and pvt offsets.
200 ENTER 714;Int,Mask,Power,Results(*)
210 PRINT "****************************************"
220 PRINT "*Power vs Time RACH Measurement Results*"
230 PRINT "****************************************"
240 PRINT "Integrity = ";Integrity
250 PRINT "Mask = ";Mask
260 PRINT "Carrier Power =";Power
270 PRINT "Offset Level (dB)"
280 PRINT "(micro sec) (dB)"
290 PRINT "------- ----------"
300 PRINT "-28 ";Results(0)
310 PRINT "-18 ";Results(1)
320 PRINT "-10 ";Results(2)
330 PRINT "0 ";Results(3)
340 PRINT "321.2 ";Results(4)
350 PRINT "331.2 ";Results(5)
360 PRINT "339.2 ";Results(6)
370 PRINT "349.2 ";Results(7)
380 PRINT "542.8 ";Results(8)
390 PRINT "552.8 ";Results(9)
400 PRINT "560.8 ";Results(10)
410 PRINT "570.8 ";Results(11)
420 EN
