Rohde & Schwarz CMU-K20, Operating Manual

Page: 637 / 646

CMU-K20/-K21/-K22/-K23/-K24 GSM Signalling Measurements
1115.6088.12 7.5 E-3
FPRINT .............................................................................
CMUGSM: PROC:BSS:LEV:UTIM -102;*OPC?
Absolute power of TCH BS signal, used TS
FPRINT .............................................................................
FPRINT START THE SINGLE SHOT BER (RXQ:BER) AND THE POWER/MODULATION MEASUREMENT
FPRINT THE TX MEASUREMENTS ARE FASTER AND WILL BE FINISHED FIRST
FPRINT WHILE THE RXQ:BER MEAS. IS RUNNING THE RXLEV AND RXQUAL CAN BE QUERIED
FPRINT .............................................................................
CMUGSM: INIT:RXQ:BER;*OPC?
Initiate single shot BER measurement
CMUGSM: INIT:POW:MPR;*OPC?
Initiate combined power/mod. measurement
WHILE CMUGSM: FETC:POW:MPR:STAT? !{} RDY
Wait until power/mod. measurement is in the
RDY (ready) state, then go to next command
CMUGSM: FETC:POW:MPR?
Return scalar power/mod. results
[MEAS1_1]
IF CMUGSM: FETC:RXQ:BER:STAT? {} RDY GOTO MEAS1_2
Check whether BER measurement is ready
CMUGSM: RREP:RXL?
Return RXLev reported by the mobile
CMUGSM: RREP:RXQ?
Return RXQual reported by the mobile
GOTO MEAS1_1
[MEAS1_2]
CMUGSM: FETC:RXQ:BER?
Read out BER measurement results
To change the traffic channel without dropping the call, use the
PROC:SIGN:CHAN
command. To
change the PCL of the mobile, use
PROC:SIGN:MS:PCL
. To change both parameters simultaneously,
use
PROC:SIGN:CHCC
.
Handover
The example of the last section is repeated for a GSM900/1800 dual-band mobile phone. To this end,
extend your
Winbatch settings such that CMUDCS denotes function group GSM1800-MS Signalling .
Repeat and modify the program of the last section in the following way:
!
Before the BCCH signal is generated, set the parameters for call setup and for the measurements
in function group GSM1800-MS Signalling:
CMUDCS: INP:STAT RF2
Define input connector RF2
CMUDCS: OUTP:STAT RF2
Define output connector RF2
CMUDCS: SENS:CORR:LOSS:INP2 2.0
Define external attenuation to compensate
CMUDCS: SENS:CORR:LOSS:OUTP2 2.0
for known cable losses
CMUDCS: CONF:NETW:SMOD:PCH FAST
Fast power change (over FACCH)
CMUDCS: CONF:RXQ:CONT:HTIM 0.2,0.0
Reduce holdoff times for AGC and
bit stream synchronization
CMUDCS: CONF:RXQ:BER1:CONT:LEV:UTIM -102.0
Absolute level in used timeslot
CMUDCS: CONF:RXQ:BER1:CONT:LEV:UNT -20.0
Relative level in unused timeslot
CMUDCS: CONF:RXQ:BER1 :CONT:REP NONE,NONE
No stop on error
CMUDCS: CONF:RXQ:BER1 :CONT BER,129
Bit error rate measurement over 129 frames
CMUDCS: CONF:RXQ:BER:TSET T1
Store configuration in test setup 1
CMUDCS: CONF:POW:MPR:CONT SCAL,10
Scalar results, 10 bursts per statistics cycle
CMUDCS: CONF:POW:MPR:CONT:REP SING,NONE,NONE
Single shot measurement, no stop on error
CMUDCS: CONF:BSS:CHAN 512
Channel number of TCH BS signal
CMUDCS: CONF:NETW:POW 5
Power control level of the mobile
setting up a call
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