6.4.1 Power control
25.1023GPPRelease 17TSUser Equipment (UE) radio transmission and reception (TDD)
6.4.1.1 3.84 Mcps option
Uplink power control is the ability of the UE transmitter to sets its output power in accordance with measured downlink path loss, values determined by higher layer signalling and path loss weighting parameter as defined in TS 25.331. The output power is defined as the RRC filtered mean power of the transmit timeslot.
6.4.1.1.1 Initial Accuracy
The UE power control initial accuracy error shall be less than +/-9dB under normal conditions and +/- 12dB under extreme conditions.
6.4.1.1.2 Differential accuracy, controlled input
The power control differential accuracy, controlled input, is defined as the error in the UE transmitter power step as a result of a step in SIRTARGET when the path loss weighting parameter =0. The step in SIRTARGET shall be rounded to the closest integer dB value. The power control error resulting from a change in IBTS or DPCH Constant Value shall not exceed the values defined in Table 6.3.
Table 6.3: Transmitter power step tolerance as a result of control power step
|
SIRTARGET [dB] |
Transmitter power step tolerance [dB] |
|
SIRTARGET 1 |
0.5 |
|
1 < SIRTARGET 2 |
1 |
|
2 < SIRTARGET 3 |
1.5 |
|
3 < SIRTARGET 10 |
2 |
|
10 < SIRTARGET 20 |
4 |
|
20 < SIRTARGET 30 |
6 |
|
30 < SIRTARGET |
9 (note 1) |
|
NOTE 1: Value is given for normal conditions. For extreme conditions value is 12 |
|
6.4.1.1.3 Differential accuracy, measured input
The power control differential accuracy, measured input, is defined as the error in UE transmitter power step change as a result of a step change in path loss LPCCPCH.
The error shall not exceed the sum of the following two errors:
– The power control error, resulting from a change in the path loss (LPCCPCH), the same tolerances as defined in table 6.3 shall apply,
– and the errors in the PCCPCH RSCP measurement as defined in TS 25.123.
6.4.1.2 1.28 Mcps TDD Option
6.4.1.2.1 Open loop power control
Open loop power control is the ability of the UE transmitter to sets its output power to a specific value. The open loop power control tolerance is given in Table 6.3A
6.4.1.2.1.1 Minimum requirement
The UE open loop power is defined as the RRC filtered mean power in a timeslot or ON power duration, whichever is available.
Table 6.3A: Open loop power control tolerance
|
Normal conditions |
± 9 dB |
|
Extreme conditions |
± 12 dB |
6.4.1.2.1.2 Additional requirement for MC-HSUPA
The open loop power control tolerance per carrier is given in Table 6.3A.
6.4.1.2.2 Closed loop power control
Closed loop power control in the Uplink is the ability of the UE transmitter to adjust its output power in accordance with one or more TPC commands received in the downlink.
6.4.1.2.2.1 Power control steps
The power control step is the change in the UE transmitter output power in response to a single TPC command, TPC_cmd, arrived at the UE.
6.4.1.2.2.1.1 Minimum requirement
The UE transmitter shall have the capability of changing the output power with a step size of 1, 2 and 3 dB according to the value of TPC or RP-TPC, in the slot immediately after the TPC_cmd can be arrived.
a) The transmitter output power step due to closed loop power control shall be within the range shown in Table 6.3B.
b) The transmitter average output power step due to closed loop power control shall be within the range shown in Table 6.3C. Here a TPC_cmd group is a set of TPC_cmd values derived from a corresponding sequence of TPC commands of the same duration.
The closed loop power is defined as the relative power differences between RRC filtered mean power of original (reference) timeslot and RRC filtered mean power of the target timeslot without transient duration.
Table 6.3B: Transmitter power control range
|
TPC_cmd |
Transmitter power control range |
|||||
|
1 dB step size |
2 dB step size |
3 dB step size |
||||
|
Lower |
Upper |
Lower |
Upper |
Lower |
Upper |
|
|
Up |
+0.5 dB |
+1.5 dB |
+1 dB |
+3 dB |
+1.5 dB |
+4.5 dB |
|
Down |
-0.5 dB |
-1.5 dB |
-1 dB |
-3 dB |
-1.5 dB |
-4.5 dB |
Table 6.3C: Transmitter average power control range
|
TPC_cmd group |
Transmitter power control range after 10 equal TPC_ cmd groups |
|||||
|
1 dB step size |
2 dB step size |
3 dB step size |
||||
|
Lower |
Upper |
Lower |
Upper |
Lower |
Upper |
|
|
Up |
+8 dB |
+12 dB |
+16 dB |
+24 dB |
+24 dB |
+36 dB |
|
Down |
-8 dB |
-12 dB |
-16 dB |
-24 dB |
-24 dB |
-36 dB |
The UE shall meet the above requirements for inner loop power control over the power range bounded by the Minimum output power as defined in subclause 6.4.3, and the Maximum output power supported by the UE (i.e. the actual power as would be measured assuming no measurement error). This power shall be in the range specified for the power class of the UE in subclause 6.2.1.
6.4.1.2.2.1.2 Additional requirement for MC-HSUPA
The UE transmitter shall have the capability of changing the output power with a step size of 1, 2 and 3 dB according to the value of TPC or RP-TPC, in the slot immediately after the TPC_cmd for the corresponding carrier can be arrived.
a) The transmitter output power step due to closed loop power control in each assigned carrier in the uplink shall be within the range shown in Table 6.3B, when the total transmit power in each of the assigned carriers is equal to each other.
b) The transmitter average output power step due to closed loop power control in each assigned carrier in the uplink shall be within the range shown in Table 6.3C, when the total transmit power in each of the assigned carriers is equal to each other. Here a TPC_cmd group is a set of TPC_cmd values derived from a corresponding sequence of TPC commands of the same duration.
c) The requirements can be tested by sending the same TPC commands for each of the assigned carriers, assuming that the signal powers for the carriers (in terms of total power) have been aligned prior to the beginning of the test procedure.
The closed loop power is defined as the relative power differences between RRC filtered mean power of original (reference) timeslot and RRC filtered mean power of the target timeslot without transient duration.
6.4.1.3 7.68 Mcps option
Uplink power control is the ability of the UE transmitter to sets its output power in accordance with measured downlink path loss, values determined by higher layer signalling and path loss weighting parameter as defined in TS 25.331. The output power is defined as the RRC filtered mean power of the transmit timeslot.
6.4.1.3.1 Initial Accuracy
The UE power control initial accuracy error shall be less than +/-9dB under normal conditions and +/- 12dB under extreme conditions.
6.4.1.3.2 Differential accuracy, controlled input
The power control differential accuracy, controlled input, is defined as the error in the UE transmitter power step as a result of a step in SIRTARGET when the path loss weighting parameter =0. The step in SIRTARGET shall be rounded to the closest integer dB value. The power control error resulting from a change in IBTS or DPCH Constant Value shall not exceed the values defined in Table 6.3D.
Table 6.3D: Transmitter power step tolerance as a result of control power step
|
SIRTARGET [dB] |
Transmitter power step tolerance [dB] |
|
SIRTARGET 1 |
0.5 |
|
1 < SIRTARGET 2 |
1 |
|
2 < SIRTARGET 3 |
1.5 |
|
3 < SIRTARGET 10 |
2 |
|
10 < SIRTARGET 20 |
4 |
|
20 < SIRTARGET 30 |
6 |
|
30 < SIRTARGET |
9 (1) |
|
Note 1: Value is given for normal conditions. For extreme conditions value is 12 |
|
6.4.1.3.3 Differential accuracy, measured input
The power control differential accuracy, measured input, is defined as the error in UE transmitter power step change as a result of a step change in path loss LPCCPCH.
The error shall not exceed the sum of the following two errors:
– The power control error, resulting from a change in the path loss (LPCCPCH), the same tolerances as defined in table 6.3 shall apply,
– and the errors in the PCCPCH RSCP measurement as defined in TS 25.123.