Rohde & Schwarz CMU-K20, Operating Manual

Page: 270 / 646

GPRS Signalling and EGPRS
CMU-K20/K21/K22/K23/K24
1115.6088.12 4.192 E-12
Service
Selection
The Service Selection softkey selects the GPRS test mode. The EGPRS test
modes require option CMU-K43. All other test modes require option CMU-K42.
Test Mode A The mobile can be commanded to test mode A specified for MS
transmitter RF tests; see below. The CMU uses the GPRS
signalling scheme.
Test Mode B The mobile can be commanded to test mode B specified for MS
receiver quality (BER) tests; see below. The CMU uses the
GPRS signalling scheme.
Red. Sig. Mode A No automatic connection setup: The mobile must be controlled
by means of an external test interface so that the CMU reaches
the
Call Established state. The reduced signalling mode is
analogous to the Signalling Channel = NONE mode for circuit
switched channels (see p. 4.176 ). The Red. Sig. Mode A is
analogous to the Test Mode A and mainly intended for MS
transmitter tests. In addition the USF BLER and the CRC Error
can be measured; see section
BER Tests of PDTCHs on p.
4.120 f.
Red. Sig. Mode B Test mode B in reduced signalling. In this mode the BER,
DBLER, USF BLER and CRC Error can be measured.
Red. Sig. –
EGPRS sym.
Reduced signalling with EGPRS modulation and coding
schemes MCS1 to MCS9 and with the same modulation (either
GMSK or 8PSK) in uplink and downlink direction. This mode is
recommended if the mobile can transmit 8PSK-modulated
signals (MCS5 to MCS9).
Red. Sig. –
EGPRS asym.
Reduced signalling with EGPRS modulation and coding
schemes and with 8PSK modulation in downlink (MCS5 to
MCS9) and GMSK modulation in uplink direction (MCS1 to
MCS4).
Downlink only The mobile only listens and receives DL data from the CMU; no
uplink signal is transmitted. This mode is suitable for mobile-
assisted BER tests.
BLER Full signalling involving the RLC layer for Block Error Rate
(BLER) measurements; see section
BER Tests of PDTCHs on
p. 4.120 f.
Note: GPRS and EGPRS restrictions:
In the current firmware version all modes except Test Mode B are
available for EGPRS channels (modulation and coding schemes
MCS1 to MCS9). All modes except the EGPRS reduced signaling
modes can be used for GPRS channels (CS1 to CS4).
The Service Selection softkey is active if the CMU acts as a BTS that supports
GPRS or EGPRS; see remark on Activating (E)GPRS on p. 4.188 and Network
Support softkey on p. 4.92 . The Service Selection softkey is inactive (grayed)
unless Network Support is set to GSM + GPRS or GSM + EGPRS .
Remote control
PROCedure:SIGNalling:PDATa:ACTion
SOFF | SON | CTMA | CTMB | CRSignalling | CRA | CDLonly CBL
[SENSe:]SIGNalling:PDATa:SERVice?
The GPRS test modes A and B are specified in GSM 04.14. Any MS must be capable of
operating either in test mode A, in test mode B or in both test modes. The CMU can activate
a test mode if the MS under test supports this mode.
深圳德标仪器
135-1095-0799