Rohde & Schwarz CMU-K20, Operating Manual

Page: 239 / 646

CMU-K20/K21/K22/K23/K24
Signalling: Connection Control
1115.6088.12 4.161 E-12
Default Settings
The
Default All Settings
switch assigns default values to all settings in the
MS
Signal
tab (the default values are quoted in the command description in chapter 6
of this manual).
Remote control
–
PMAX
The
PMAX
parameter sets the maximum MS transmitter output power allowed in
the cell. The value corresponds to the output power at which the mobile station
performs a location update to synchronize to the CMU. It is valid both for circuit
switched and for packet data mode.
The maximum MS transmitter output power can be selected in PCL (Power Control
Level) units or as a corresponding absolute power value (in dBm with a 2 dBm
spacing); see section
Limit Values for Average Burst Power (Power Configuration –
Limits)
on page
4.112
.
Note: PMAX defines the MS output power for access burst measurements
(application
P/t Access Burst)
. The other
Power
measurements are
performed at the MS output power set
via PCL (MS)
(see PCL softkey
on p.
4.155
) or the corresponding parameters for multislot or packet
data mode.
Remote control
CONFigure:MSSignal:CCH:PMAX
Circuit Switched
– DTX (MS)
The
DTX (MS)
parameter decides whether or not the mobile station may use the
operating mode
Discontinuous Transmission
.
In the operating mode DTX
(discontinuous transmission mode)
the
voice activity detection
of
the mobile station analyzes the language elements and the intervals and decides whether a
transmission is required. As a result of this, only useful information is transferred; if nothing is
spoken, the mobile station will not transmit anything. The DTX method permits to reduce
radio interference, the power as well as the current consumption of the mobile stations.
Note: Since the mobile station only transmits from time to time in DTX mode,
the RF measurement can only sporadically be performed by the CMU.
Therefore, the DTX mode is switched
Off
in the default setting.
Remote control
CONFigure:MSSignal[:CSWitched]:DTX ON | OFF
[SENSe:]RREPorts:DTX?
RF Signals of the CMU (Connection Control – BS Signal)
The
BS Signal
tab configures the operating mode and the RF control and traffic channel signals that
the CMU transmits to communicate with the MS under test. Some functions of the menu depend on the
Main Service (Circuit Switched
or
Packet Data (GPRS)
operating mode) and the
Slot Mode (Single Slot
or
Multislot
operation) of the mobile as well as on the signalling state of the CMU
(Call Established
or
other states). As a consequence, settings may be disabled or even hidden in some operating modes of
the CMU/MS test system. Exact information is provided in the command description in chapter 6 of this
manual.
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