Programming a RACH Measurement

Overview of Measurement Procedure

1. Ensure that the mobile is switched off.
2. 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.
3. Set triggering to single.
4. 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

Related Topics

RACH Measurement Description

RACH Troubleshooting