WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
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User Manual 1173.9657.02 ─ 11
You can define the target power either as maximum UL DPCH power or as maximum
total UL power. "Maximum" because both the DPCH power and the total power may
vary during a call, even if the UL power is not changed via TPC commands. The
DPDCH power for example may vary during a voice call, causing a change of the
DPCH power and the total power. Or the HS-DPCCH power may vary depending on
the transmitted contents (CQI, ACK/NACK, DTX), causing a change of the total power.
Please note that the closed loop algorithms use the configured gain factors to calculate
the maximum expected power from measured UL power values. If the UE fails to apply
the gain factors correctly, this will result in a deviation of the reached target power.
Many conformance test cases in 3GPP TS 34.121 request that the "power level of UE"
is set to a specific value. Applying a total target power is appropriate in that case.
Some test cases also request a specific uplink DPCH power, so that the target power
should be defined as DPCH power. An example is 3GPP TS 34.121, section 5.13.1AA.
4.2, step 5, where -18 dBm are requested for the "half-slot period with the lowest out-
put power" (no HS-DPCCH power, only DPCH power).
2.2.14.3
Change of TFC TPC Setup
The conformance test specification 3GPP TS 34.121, section 5.6 "Change of TFC"
defines a test for verification of the UE power steps caused by switching the DPDCH
on or off.
For this test, an RMC with 12.2 kbps, loopback and 50 % downlink resources in use
must be set up. To prevent the power control mechanism from counterbalancing the
induced power steps, a power control algorithm 2 with alternating TPC pattern is used.
The TPC setup "Change of TFC" provides such an alternating TPC pattern with algo-
rithm 2. It has been introduced to simplify the configuration of "Change of TFC" tests
according to 3GPP. The RMC settings are not influenced by the selected TPC setup
and must be configured additionally. Remember to reset the usage of downlink resour-
ces to 100 % when you want to use another TPC setup.
"Change of TFC" measurements can be performed as combined signal path measure-
ments with the "TPC measurement" (included in R&S CMW-KM400).
2.2.14.4
Max. Power E-DCH TPC Setup
The conformance test specification 3GPP TS 34.121, section 5.2B "Maximum Output
Power with HS-DPCCH and E-DCH" defines a test for verification of the maximum UE
power with active HS-DPCCH and E-DCH. The test comprises five subtests.
Subtest 1 to 4 verify the maximum UE power for different RMC plus HSPA signals. The
test procedure is identical for all four subtests. It requires algorithm 2 and the test pat-
tern "m*11111+n*00000...01...". So m times a +1 TPC_cmd is sent, then n times a -1
TPC_cmd and finally the UE power is kept constant via an alternating pattern. The
numbers n and m are dynamic and depend on the E-TFCI values received from the UE
during the subtest.
Subtest 5 verifies the maximum UE power for an SRB plus HSPA signal (no RMC). It
requires algorithm 1 and an "All 1" TPC pattern.
General Description
深圳德标仪器
135-1095-0799