Rohde & Schwarz CMU-K20, Руководство по эксплуатации

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CMU-K20/-K21/-K22/-K23/-K24 GSM Signalling Measurements
1115.6088.12 7.3 E-3
GSM Signalling Measurements
A GSM mobile phone is connected to the bidirectional connector RF2 as described in chapter 2 and
tested. We assume that the mobile phone is capable of operating in the GSM900 band; in the example
involving a GSM900/1800 handover, an appropriate dual-band mobile must be used. Moreover, a test
SIM card for the mobile phone is required.
Call Setup to the Mobile Phone, Simple RX/TX Measurements
Preliminary configurations for a power and receiver quality measurement are defined, and the network
parameters are set for maximum speed of the call procedure. The IMSI of the mobile phone must be
known to set up a call; it can be either reported to the tester or will be determined during the location
update. The first alternative will speed up the call procedure.
Next, the CMU generates a BCCH (C0 carrier) signal for synchronization. The mobile phone searches
the whole channel range for this BCCH and camps on it for some mobile-specific time until it reaches
the
Synchronized state. In this state, configuration settings made at the beginning are checked, and the
CMU sets up a call to the mobile phone. Parameters such as the PCL and channel should be defined
before the call is setup to reduce signalling time (no PCL/channel change). As soon as the call is
established, power and receiver quality measurements are performed.
Before running the program, configure your Winbatch settings such that CMUBASE is the device name
for the CMU BASE system and CMUGSM denotes function group GSM900-MS Signalling .
ECHO ON
FPRINT ............................................................................
FPRINT INITIALISATION ROUTINE:
FPRINT ASK FOR THE IDENTIFIER OF THE CMU, RESET THE INSTRUMENT,
FPRINT DEFINE THE SECONDARY ADDRESSES FOR ALL AVAILABLE FUNCTION GROUPS
FPRINT ............................................................................
CMUBASE: *IDN?
Identification query
CMUBASE: *RST;*OPC?
Reset the instrument; prevent the following
command to be executed before *RST is
complete
CMUBASE: *CLS
Clear output buffer, set status byte
CMUBASE: SYST:REM:ADDR:SEC 1,"RF_NSig"
Define all function groups
CMUBASE: SYST:REM:ADDR:SEC 2,"GSM900MS_Sig"
CMUBASE: SYST:REM:ADDR:SEC 3,"GSM900MS_NSig"
CMUBASE: SYST:REM:ADDR:SEC 4,"GSM1800MS_Sig"
CMUBASE: SYST:REM:ADDR:SEC 5,"GSM1800MS_NSig"
CMUBASE: SYST:REM:ADDR:SEC 6,"GSM1900MS_Sig"
CMUBASE: SYST:REM:ADDR:SEC 7,"GSM1900MS_NSig"
FPRINT .............................................................................
FPRINT CONN ATTENUATION
FPRINT .............................................................................
CMUGSM: INP:STAT RF2
Define input connector RF2
CMUGSM: OUTP:STAT RF2
Define output connector RF2
CMUGSM: SENS:CORR:LOSS:INP2 1.0
Define external attenuation to compensate
CMUGSM: SENS:CORR:LOSS:OUTP2 1.0
for known cable losses
FPRINT .............................................................................
FPRINT NETWORK PARAMETERS, SELECTED FOR MAXIMUM SPEED OF THE CALL PROCEDURE
FPRINT THE IMSI REQUIRED MAY DIFFER FROM THE EXAMPLE (=DEFAULT) SETTINGS
FPRINT .............................................................................
CMUGSM: CONF:NETW:SMOD:IMSI:MNC 001;MCC 01;MSIN '1000000095'
Set IMSI
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