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WCDMA TPC Measurement
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
784
User Manual 1173.9657.02 ─ 11
Table 4-4: Nominal maximum power and tolerances, depending on subtest and power class
Subtest
Power Class 3
Power Class 4
Power [dBm]
Tolerance [dB]
Power [dBm]
Tolerance [dB]
1
24
+1.7 / -6.7
21
+2.7 / -5.7
2
22
+3.7 / -5.2
19
+4.7 / -4.2
3
23
+2.7 / -5.2
20
+3.7 / -4.2
4
22
+3.7 / -5.2
19
+4.7 / -4.2
5
24
+1.7 / -3.7
21
+2.7 / -2.7
4.2.6.5
Change of TFC Limits
When the uplink Transport Format Combination (TFC) changes, this means that the
data rate changes and also that the uplink power changes. 3GPP defines a power step
tolerance for a specific data rate change: the change between a signal with DPCCH
only and a signal with DPCCH and DPDCH.
The "Change of TFC" test is specified in 3GPP TS 34.121, section 5.6. A requirement
is defined for an RMC signal with 12.2 kbps,
β
c
= 8/15 and
β
d
=15/15. For this signal, a
power step size of 7 dB is expected between a slot with DPDCH on and an adjacent
slot with DPDCH off (DTX). The tolerance specified as test requirement equals
±
2.3
dB.
The default limit settings in the configuration dialog correspond to the test require-
ments. The expected step size can be calculated automatically from the configured
beta factors and is rounded to the closest integer dB value as requested by 3GPP.
Alternatively you can disable "Calculate from Beta Factors" and enter the expected
step size manually.
Fig. 4-8: Change of TFC limit settings
The limit is relevant for TPC setup "Change of TFC".
4.2.6.6
UL Compressed Mode Power Limits
During uplink compressed frames a change of output power is required, since the
transmission of data is performed in a shorter interval. The ratio of the amplitude
between the DPDCH codes and the DPCCH code also varies. The power step during
compressed mode is calculated in the UE following the inner loop power control.
The "UL CM TX" test is specified in 3GPP TS 34.121, section 5.7. A requirement of the
initial connection without CM is defined for an RMC signal with 12.2 kbps,
β
c
= 8/15 and
β
d
=15/15. The required output power of the UE is -36
±
9 dBm.
General Description
深圳德标仪器
135-1095-0799