Rohde & Schwarz CMU-K20, Operating Manual

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CMU-K20/K21/K22/K23/K24
GPRS Signalling and EGPRS
1115.6088.12 4.197 E-12
Note: The number of downlink and uplink channels must be compatible with
the multislot class of the MS under test; see
Table 4-10
on p. 4.149
.
Remote control
CONFigure:MSSignal:PDATa[:TCH]:MSLot:SCONfig
CONFigure:BSSignal:PDATa[:TCH]:MSLot:SCONfig
PROCedure:SIGNalling:PDATa[:TCH]:MSLot:SCONfig
RF Signals of the CMU (Connection Control – BS Signal)
The
BS Signal
tab configures the RF signals of the CMU (which simulates a base station transmitting a
GSM control and traffic channel signal), selects a frequency offset, the frequency hopping scheme and
the traffic channel data. For multislot packet data transfer, the downlink (BS signal) and uplink (MS
signal) signal configuration is defined in a common table, so the
BS Signal
tab provides many of the
settings that are also available in the
MS Signal
tab. The following additional packet data parameters
can be set:
•
The downlink power control parameter
(P0)
•
The
RF Channel
that the CMU will use for packet data transfer
GPRS Downlink Power Control
A BTS can use downlink power control to reduce its output power. Downlink power control relies on a reduction of
the PDCH power relative to the BCCH power. This power reduction is defined in terms of a power control
parameter P0 which can be specific to a particular MS in the network (power control mode A) or the same for all
MS with a TBF established on the same PDCH (power control mode B). For details refer to GSM 05.08 and GSM
04.60.
The P0 parameter can be selected for the BS Signal transmitted by the CMU. The CMU also uses this parameter
and its BCCH level to calculate the
Reference Level
for all individual downlink channels in a GPRS multislot
configuration.
The CMU provides a softkey-oriented version of the
BS Signal
tab and a table-oriented version with
extended functionality. The
MS Signal
hotkey toggles between the two versions if it is pressed
repeatedly. For packet data mode, the two tabs provide the same settings.
Fig. 4-89 Connection Control – BS Signal (table)
深圳德标仪器
135-1095-0799