8.5 Power control in downlink
25.1023GPPRelease 17TSUser Equipment (UE) radio transmission and reception (TDD)
Power control in the downlink is the ability of the UE receiver to converge to the required link quality set by the network while using minimum downlink power.
8.5.1 Power control in downlink, constant BLER target
8.5.1.1 Minimum requirements 3.84 Mcps TDD option
For the parameters specified in Table 8.12 the downlink 
averaged over one timeslot shall be below the specified value in Table 8.13 more than 90% of the time. BLER shall be as shown in Table 8.13. Downlink power control is ON during the test.
Table 8.12: Test parameters for downlink power control – constant BLER Target (3.84 Mcps TDD option)
|
Parameter |
Unit |
Test 1 |
|
|
dB |
0 |
|
|
dBm/3.84 MHz |
-60 |
|
Information Data Rate |
kbps |
12.2 |
|
Target quality value on DTCH |
BLER |
0.01 |
|
Propagation condition |
Case 1 |
|
|
DL Power Control step size, TPC |
dB |
1 |
|
Maximum_DL_power * |
dB |
0 |
|
Minimum_DL_power * |
dB |
-27 |
|
*Note: Refer to TS 25.224 for description and definition |
||
Table 8.13: Requirements for downlink power control – constant BLER Target (3.84 Mcps TDD option)
|
Parameter |
Unit |
Test 1 |
|
|
dB |
8.5 |
|
Measured quality on DTCH |
BLER |
0.01±30% |
8.5.1.2 Minimum requirements 1.28 Mcps TDD option
For the parameters specified in Table 8.13A the downlink 
averaged over one timeslot, shall be below the specified value in Table 8.13B more than 90% of the time. BLER shall be as shown in table 8.13B. Downlink power control is ON during the test.
Table 8.13A: Test parameters for downlink power control – constant BLER Target (1.28 Mcps TDD option)
|
Parameter |
Unit |
Test 1 |
Test 2 |
Test 3 |
Test 4 |
Test 5 |
Test 6 |
|
|
dB |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
dBm/1.28 Mhz |
-60 |
-60 |
-60 |
-60 |
-60 |
-60 |
|
Information data rate |
kbps |
12.2 |
12.2 |
64 |
64 |
64 |
64 |
|
Target quality on DTCH |
BLER |
0.01 |
0.01 |
0.1 |
0.1 |
0.001 |
0.001 |
|
Propagation condition |
Case 1 |
Case 3 |
Case 1 |
Case 3 |
Case 1 |
Case 3 |
|
|
DL Power Control step size, TPC |
dB |
1 |
1 |
1 |
1 |
1 |
1 |
|
Maximum_DL_power * |
dB |
0 |
0 |
0 |
0 |
0 |
0 |
|
Minimum_DL_power * |
dB |
-27 |
-27 |
-27 |
-27 |
-27 |
-27 |
NOTE: Power is compared to P-CCPCH power
Table 8.13B: Requirements for downlink power control – constant BLER Target (1,28 Mcps TDD option)
|
Parameter |
Unit |
Test 1 |
Test 2 |
Test 3 |
Test 4 |
Test 5 |
Test 6 |
|
|
dB |
7.5 |
4.8 |
9.1 |
8.9 |
17.9 |
13.1 |
|
Measured quality on DTCH |
BLER |
0.01±30% |
0.01±30% |
0.1±30% |
0.1±30% |
0.001±30% |
0.001±30% |
8.5.2 Power control in downlink, wind up effects
8.5.2.1 Minimum requirements 3.84 Mcps TDD option
Void
8.5.2.2 Minimum requirements 1.28 Mcps TDD option
This test is run in three stages where stage 1 is for convergence of the power control loop. In stage two the maximum downlink power for the dedicated channel is limited not to be higher than the value specified in Table 8.13C. All parameters used in the three stages are specified in Table 8.13C. The downlinkI Ior/Ioc power ratio measured values, which are averaged over one timeslot, during stage 3 shall be lower than the value specified in Table 8.13D more than 90% of the time.
Power control of the UE is ON during the test.
Table 8.13C: Test parameter for downlink power control, wind-up effects
|
Parameter |
Unit |
Test 1 |
||
|
Stage 1 |
Stage 2 |
Stage 3 |
||
|
Time in each stage |
s |
5 |
40 |
5 |
|
|
dBm/1.28 MHz |
-60 |
||
|
Information Data Rate |
kbps |
12.2 |
||
|
Quality target on DTCH |
BLER |
0.01 |
||
|
Propagation condition |
Case 1 |
|||
|
Maximum_DL_Power |
dB |
0 |
P( Note 1) |
0 |
|
Minimum_DL_Power |
dB |
-27 |
||
|
DL Power Control step size, TPC |
dB |
1 |
||
|
Note 1: P is the level corresponding to the average Ior/Ioc power ratio – 3 dB compared to the P-CCPCH level. The average Ioc/Ioc power ratio is measured during the initialisation stage after the power control loop has converged before the actual test starts. |
||||
Table 8.13D: Requirements in downlink power control, wind-up effects
|
Parameter |
Unit |
Test 1, stage 3 |
|
Ior/Ioc |
dB |
9.1 |
8.5.3 Power control in the downlink, initial convergence
This requirement verifies that DL power control works properly during the first seconds after DPCH connection is established
8.5.3.1 Minimum requirements 3.84 Mcps TDD option
Void
8.5.3.2 Minimum requirements 1.28 Mcps TDD option
For the parameters specified in Table 8.13E the downlink power ratio measured values, which are averaged over 50 ms, shall be within the range specified in Table 8.13F more than 90% of the time. T1 equals to 5 s and it starts 100 ms after the DPCH physical channel is considered established and the first uplink frame is transmitted. T2 equals to 5 s and it starts when T1 has expired. Power control is ON during the test.
The first 100 ms shall not be used for averaging, ie the first sample to be input to the averaging filter is at the beginning of T1. The averaging shall be performed with a sliding rectangular window averaging filter. The window size of the averaging filter is linearly increased from 0 up to 50 ms during the first 50 ms of T1, and then kept equal to 50ms.
Table 8.13E: Test parameters for downlink power control, initial convergence
|
Parameter |
Unit |
Test 1 |
Test 2 |
Test 3 |
Test 4 |
|
Target quality value on DTCH |
BLER |
0.01 |
0.01 |
0.1 |
0.1 |
|
Initial |
dB |
5 |
-15 |
9.4 |
-10.6 |
|
Information Data Rate |
kbps |
12.2 |
12.2 |
64 |
64 |
|
|
dBm/1.28 MHz |
-60 |
|||
|
Propagation condition |
Static |
||||
|
Maximum_DL_Power |
dB |
0 |
|||
|
Minimum_DL_Power |
dB |
-27 |
|||
|
DL Power Control step size, TPC |
dB |
1 |
|||
Table 8.13F: Requirements in downlink power control, initial convergence
|
Parameter |
Unit |
Test 1 and Test 2 |
Test 3 and Test 4 |
|
during T1 |
dB |
-8.5 0 |
-4.1 4.4 |
|
during T2 |
dB |
-8.5 -3 |
-4.1 1.4 |