LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
61
User Manual 1173.9628.02 ─ 16
2.2.18 Relative Power Control Tests
Uplink power control tests with relative commands are specified in 3GPP TS 36.521,
section 6.3.5.2 "Power Control Relative power tolerance". The first two subtests require
special TPC power control patterns combined with a dynamic resource block alloca-
tion. Such patterns are provided by the signaling application and are described in this
section.
The basic test procedure specified by 3GPP for both subtests is as follows:
1. Command the UE to the initial target power, depending on the carrier frequency.
2. Configure the initial RB allocation, depending on the duplex mode and the channel
bandwidth.
3. Send the TPC pattern and measure the resulting power steps. In parallel, change
the resource block allocation.
For subtest 1, the test has to be performed three times, with the ramping up TPC pat-
terns A, B and C. All three patterns consist of +1 dB commands over 40 active uplink
subframes. Within each pattern there is one RB allocation change. The change
depends on the channel bandwidth. The position of the change within the pattern dif-
fers for pattern A, B and C.
Subtest 2 is similar, with ramping down TPC patterns instead of ramping up patterns.
The following figure shows the ramping up TPC pattern A for FDD as an example. The
RB allocation change is located after the first radio frame (10 subframes).
Fig. 2-21: Ramping up pattern A for FDD
The 3GPP specification allows us to interrupt the power ramping. The interruptions
must be whole numbers of radio frames without power change (0 dB commands). The
R&S
CMW inserts such interruptions in order to reconfigure the input path according to
the changing expected nominal power.
Thus the measured UE power diagram with TPC pattern A for FDD looks typically as
follows.
General Description
深圳德标仪器
135-1095-0799
