Reference Manual

Radio Transmission
02_0467A
RBS
TX
TX
TX
Combining
system
+
filtering
X
X = TX reference point
Antenna
mounted
equipment
Feeder
.
.
Figure 100 TX reference point X with antenna mounted equipment
33.3 Functions
Radio transmission
Radio transmission denotes the function to "Generate an RF signal"
from the bit stream that constitutes a burst.
The transmitter uses the modulation format specified in /GSM:05.04/ for
GSM 900 and GSM 1800 and /JTC:4/ for GSM 1900.
The RF transmission characteristics are in compliance with
requirements in /GSM:05.05/ for GSM 900 and GSM 1800 and /JTC:5/
for GSM 1900.
The synchronisation of the RF transmission is in compliance with
requirements in /GSM:05.10/ for GSM 900 and GSM 1800 and /JTC:7/
for GSM 1900.
BCCH carrier filling
The output power for a transmitter sending the BCCH frequency is
constant and equal to the nominal output power, except for the power
ramping between bursts. See /GSM 05.08:7.1/ for GSM 900 and
GSM 1800 and /JTC:6.5.1/ for GSM 1900.
During idle timeslots, dummy bursts are transmitted. The dummy burst
is defined in /GSM:05.02:5.2.6/.
Transmitter filling
The RBS can be configured for transmitter filling. All transmitters
serving a cell are then configured with a filling level which transmits
dummy bursts in the idle timeslots.
Transmitter filling is not configurable for synthesized frequency hopping
transmitters or for transmitters configured for DTX.
Transmitters configured for BCCH carrier are not affected by the filling
level.
EN/LZT 720 0008 R1A
2001-06-26
261 (421)
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