6.4 Output power dynamics
25.1013GPPRelease 17TSUser Equipment (UE) radio transmission and reception (FDD)
Power control is used to limit the interference level.
6.4.1 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 6.3
6.4.1.1 Minimum requirement
The UE open loop power is defined as the mean power in a timeslot or ON power duration, whichever is available.
Table 6.3: Open loop power control tolerance
|
Conditions |
Tolerance |
|
Normal conditions |
± 9 dB |
|
Extreme conditions |
± 12 dB |
6.4.1.1A Additional requirement for DC-HSUPA
The open loop power control tolerance per carrier is given in Table 6.3.
6.4.1.1B Additional requirement for DB-DC-HSUPA
The open loop power control tolerance per carrier is given in Table 6.3.
6.4.2 Inner loop power control in the uplink
Inner 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. There are two inner loop power control loops defined , one that controls the DPCCH and one that controls the DPCCH2 power when DPCCH2 is configured.
6.4.2.1 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, derived at the UE.
6.4.2.1.1 Minimum requirement
The UE transmitter shall when DPCCH2 is not configured 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 as follows
a) The transmitter output power step due to inner loop power control shall be within the range shown in Table 6.4.
b) The transmitter average output power step due to inner loop power control shall be within the range shown in Table 6.5. 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 inner loop power step is defined as the relative power difference between the mean power of the original (reference) timeslot and the mean power of the target timeslot, not including the transient duration. The transient duration is from 25μs before the slot boundary to 25μs after the slot boundary.
Table 6.4: 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 |
|
|
+ 1 |
+0.5 dB |
+1.5 dB |
+1 dB |
+3 dB |
+1.5 dB |
+4.5 dB |
|
0 |
-0.5 dB |
+0.5 dB |
-0.5 dB |
+0.5 dB |
-0.5 dB |
+0.5 dB |
|
-1 |
-0.5 dB |
-1.5 dB |
-1 dB |
-3 dB |
-1.5 dB |
-4.5 dB |
The UE transmitter shall when DPCCH2 is configured have the capability of changing the power for the DPCCH code as well as the DPCCH2 code 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 as follows
a) These requirements are valid as long as the maximum code power difference between DPCCH2 and DPCCH is between -5 and +20 dB.
b) The transmitter output power step due to inner loop power control shall be within the range shown in Table 6.4A.
c) The transmitter average output power step due to inner loop power control shall be within the range shown in Table 6.5. 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 inner loop power step is defined as the relative power difference between the mean code power of the original (reference) timeslot and the mean code power of the target timeslot, not including the transient duration. The transient duration is from 25μs before the slot boundary to 25μs after the slot boundary.
Table 6.4A: 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 |
|
|
+ 1 |
+1.0 dB |
+2.0 dB |
+1.5 dB |
+3.5 dB |
+2 dB |
+5 dB |
|
0 |
-1 dB |
+1 dB |
-1 dB |
+1 dB |
-1 dB |
+1 dB |
|
-1 |
-1 dB |
-2 dB |
-1.5 dB |
-3.5 dB |
-2 dB |
-5 dB |
Table 6.4A: Transmitter power control range for exceptions
|
TPC_ cmd |
Transmitter power control range |
|||||
|
1 dB step size |
2 dB step size |
3 dB step size |
||||
|
Lower |
Upper |
Lower |
Upper |
Lower |
Upper |
|
|
+ 1 |
-0.5 dB |
+2.5 dB |
+0.5 dB |
+3.5 dB |
+1.5 dB |
+4.5 dB |
|
0 |
-0.5 dB |
+0.5 dB |
-0.5 dB |
+0.5 dB |
-0.5 dB |
+0.5 dB |
|
-1 |
0.5 dB |
-2.5 dB |
-0.5 dB |
-3.5 dB |
-1.5 dB |
-4.5 dB |
Table 6.5: Transmitter aggregate power control range
|
TPC_ cmd group |
Transmitter power control range after 10 equal TPC_ cmd groups |
Transmitter power control range after 7 equal TPC_ cmd groups |
||||
|
1 dB step size |
2 dB step size |
3 dB step size |
||||
|
Lower |
Upper |
Lower |
Upper |
Lower |
Upper |
|
|
+1 |
+8 dB |
+12 dB |
+16 dB |
+24 dB |
+16 dB |
+26 dB |
|
0 |
-1 dB |
+1 dB |
-1 dB |
+1 dB |
-1 dB |
+1 dB |
|
-1 |
-8 dB |
-12 dB |
-16 dB |
-24 dB |
-16 dB |
-26 dB |
|
0,0,0,0,+1 |
+6 dB |
+14 dB |
N/A |
N/A |
N/A |
N/A |
|
0,0,0,0,-1 |
-6 dB |
-14 dB |
N/A |
N/A |
N/A |
N/A |
The UE shall meet the above requirements with the exceptions defined below 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. For each direction, up to 2 exceptions to the transmitter power control range defined in table 6.4 shall be allowed. The transmitter power control range for exceptions is defined in table 6.4A.
6.4.2.1.1A Additional requirement for DC-HSUPA
The UE transmitter shall have the capability of changing the output power in each assigned carrier in the uplink 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 as follows
a) The transmitter output power step due to inner loop power control in each assigned carrier in the uplink shall be within the range shown in Table 6.4 with the exceptions defined below, 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 inner loop power control in each assigned carrier in the uplink shall be within the range shown in Table 6.5 with the exceptions defined below, 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 DPCCH code power and total power) have been aligned prior to the beginning of the test procedure.
The inner loop power step is defined as the relative power difference between the mean power of the original (reference) timeslot and the mean power of the target timeslot in each carrier, not including the transient duration. The transient duration is from 25μs before the slot boundary to 25μs after the slot boundary. For each direction, up to 2 exceptions to the transmitter power control range defined in table 6.4 shall be allowed. The transmitter power control range for exceptions is defined in table 6.4A.
6.4.2.1.1B Additional requirement for UL OLTD
For the UE with two active transmit antenna connectors in UL OLTD operation, the inner loop power control in the uplink specified in sub-clause 6.4.2.1.1 applies at each transmit antenna connector.
6.4.2.1.1C Additional requirement for UL CLTD
For UE with two active transmit antenna connectors in UL CLTD activation state 1, the inner loop power control in the uplink specified in sub-clause 6.4.2.1.1 applies at each transmit antenna connector.
For UE configured in UL CLTD activation state 2 or activation state 3, the inner loop power control in the uplink specified in sub-clause 6.4.2.1.1 applies at the active transmit antenna connector.
6.4.2.1.1D Additional requirement for UL MIMO
For UE with two active transmit antenna connectors in UL MIMO operation, the inner loop power control in the uplink specified in sub-clause 6.4.2.1.1 applies at each transmit antenna connector.
6.4.2.1.1E Additional requirement for DB-DC-HSUPA
For UE supporting DB-DC-HSUPA operation, the inner loop power control in the uplink specified in sub-clause 6.4.2.1.1A applies.
6.4.3 Minimum output power
The minimum controlled output power of the UE is when the power is set to a minimum value.
6.4.3.1 Minimum requirement
The minimum output power is defined as the mean power in one time slot. The minimum output power shall be less than -50 dBm.
6.4.3.1A Additional requirement for DC-HSUPA
The minimum output power is defined as the mean power in one time slot in each carrier. The minimum output power in each carrier shall be less than -50 dBm, when both carriers are set to minimum output power.
6.4.3.1B Additional requirement for UL OLTD
For the UE with two active transmit antenna connectors in UL OLTD operation, the minimum output power specified in sub-clause 6.4.3.1 applies at each transmit antenna connector, when the UE power is set to a minimum value.
6.4.3.1C Additional requirement for UL CLTD
For UE with two active transmit antenna connectors in UL CLTD activation state 1, the minimum output power specified in sub-clause 6.4.3.1 applies at each transmit antenna connector, when the UE power is set to a minimum value.
For UE configured in UL CLTD activation state 2 or activation state 3, the minimum output power specified in sub-clause 6.4.3.1 applies at the active transmit antenna connector, when the UE power is set to a minimum value.
6.4.3.1D Additional requirement for UL MIMO
For UE with two active transmit antenna connectors in UL MIMO operation, the minimum output power specified in sub-clause 6.4.3.1 applies at each transmit antenna connector, when the UE power is set to a minimum value.
6.4.3.1E Additional requirement for DB-DC-HSUPA
For UE supporting DB-DC-HSUPA operation, the minimum output power specified in sub-clause 6.4.3.1A applies.
6.4.4 Out-of-synchronization handling of output power
The receiver characteristics in this section are specified at the antenna connector of the UE. For UE(s) with an integral antenna only, a reference antenna with a gain of 0 dBi is assumed. UE with an integral antenna may be taken into account by converting these power levels into field strength requirements, assuming a 0 dBi gain antenna. For UEs with more than one receiver antenna connector the AWGN signals applied to each receiver antenna connector shall be uncorrelated. The levels of the test signal applied to each of the antenna connectors shall be as defined in section 6.4.4.2 below.
The UE shall monitor the DPCCH quality in order to detect a loss of the signal on Layer 1, as specified in TS 25.214. The thresholds Qout and Qin specify at what DPCCH quality levels the UE shall shut its power off and when it shall turn its power on respectively. The thresholds are not defined explicitly, but are defined by the conditions under which the UE shall shut its transmitter off and turn it on, as stated in this subclause.
The DPCCH quality shall be monitored in the UE and compared to the thresholds Qout and Qin for the purpose of monitoring synchronization. The threshold Qout should correspond to a level of DPCCH quality where no reliable detection of the TPC commands transmitted on the downlink DPCCH can be made. This can be at a TPC command error ratio level of e.g. 30%. The threshold Qin should correspond to a level of DPCCH quality where detection of the TPC commands transmitted on the downlink DPCCH is significantly more reliable than at Qout. This can be at a TPC command error ratio level of e.g. 20%.
6.4.4.1 Minimum requirement
For the minimum requirement specified in this clause, it is assumed the use of either the Algorithm 1 or 2 [8] unless otherwise stated (i.e. Algorithm 3).
UE shall shut its transmitter off within 40 ms when the UE estimates the following quality to be worse than a threshold Qout:
– the DPCCH quality or the quality of the TPC fields of the F-DPCH frame received from the serving HS-DSCH cell over the last 160 ms period or,
– the quality of the TPC fields of the F-DPCH from the serving HS-DSCH cell over the previous 240 slots in which the TPC symbols are known to be present when the discontinuous uplink DPCCH transmission operation or the Algorithm 3 [8] is enabled.
The UE shall not turn its transmitter on again until the DPCCH quality exceeds an acceptable level Qin. The UE shall again turn its transmitter on within 40 ms when the UE estimates the following quality to be better than a threshold Qin:
– the DPCCH quality or the quality of the TPC fields of the F-DPCH frame received from the serving HS-DSCH cell over the last 160 ms period or,
– the quality of the TPC fields of the F-DPCH from the serving HS-DSCH cell over the previous 240 slots in which the TPC symbols are known to be present when the discontinuous uplink DPCCH transmission operation or the Algorithm 3 [8] is enabled.
The UE transmitter shall be considered "off" if the transmitted power is below the level defined in subclause 6.5.1 (Transmit off power). Otherwise the transmitter shall be considered as "on".
6.4.4.1A Additional requirement for UL OLTD
For UE with two active transmit antenna connectors in UL OLTD operation, the minimum requirements specified in sub-clause 6.4.4.1 apply at each transmit antenna connector.
6.4.4.1B Additional requirement for UL CLTD
For UE with two active transmit antenna connectors in UL CLTD activation state 1, the minimum requirements specified in sub-clause 6.4.4.1 apply at each transmit antenna connector.
For UE configured in UL CLTD activation state 2 or activation state 3, the minimum requirements specified in sub-clause 6.4.4.1 apply at the active transmit antenna connector.
6.4.4.1C Additional requirement for UL MIMO
For UE with two active transmit antenna connectors in UL MIMO operation, the minimum requirements specified in sub-clause 6.4.4.1 apply at each transmit antenna connector.
6.4.4.1D Additional requirement for DB-DC-HSUPA
For UE supporting DB-DC-HSUPA operation, the minimum requirements specified in sub-clause 6.4.4.1 apply per carrier.
When the primary carrier is determined to be out-of-synchronization, UE shall shut its transmitter off for both primary and secondary carriers regardless of whether the secondary carrier is out-of-synchronization or not. When the secondary carrier is determined to be out-of-synchronization, the UE can continue to transmit on the primary carrier on the other band as long as it is not out-of-synchronization.
6.4.4.2 Test case
This subclause specifies a test case, which provides additional information for how the minimum requirement should be interpreted for the purpose of conformance testing.
The quality levels at the thresholds Qout and Qin correspond to different signal levels depending on the downlink conditions DCH parameters. For the conditions in Table 6.6, a signal with the quality at the level Qout can be generated by a DPCCH_Ec/Ior ratio of -25 dB, and a signal with Qin by a DPCCH_Ec/Ior ratio of -21 dB. For a UE which supports the optional enhanced performance requirements type1 for DCH a signal with the quality at the level Qout can be instead generated by a DPCCH_Ec/Ior ratio of -28 dB, and a signal with Qin by a DPCCH_Ec/Ior ratio of -24 dB for the conditions in Table 6.6. The DL reference measurement channel (12.2) kbps specified in subclause A.3.1 and with static propagation conditions. The downlink physical channels, other than those specified in Table 6.6, are as specified in Table C.3 of Annex C.
Figure 6.1 shows an example scenario where the DPCCH_Ec/Ior ratio varies from a level where the DPCH is demodulated under normal conditions, down to a level below Qout where the UE shall shut its power off and then back up to a level above Qin where the UE shall turn the power back on. Figure 6.1A shows an example scenario for a UE which supports the optional enhanced performance requirements type1 for DCH, where the DPCCH_Ec/Ior ratio varies from a level where the DPCH is demodulated under normal conditions, down to a level below Qout where the UE shall shut its power off and then back up to a level above Qin where the UE shall turn the power back on.
Table 6.6: DCH parameters for the Out-of-synch handling test case
|
Parameter |
Unit |
Value |
||||||
|
|
dB |
-1 |
||||||
|
|
dBm/3.84 MHz |
-60 |
||||||
|
|
dB |
See figure 6.1: Before point A -16.6 |
||||||
|
|
dB |
See figure 6.1 |
||||||
|
Information Data Rate |
kbps |
12.2 |
Figure 6.1: Test case for out-of-synch handling in the UE
Figure 6.1A: Test case for out-of-synch handling in the UE supporting the enhanced performance requirements type1
In this test case, the requirements for the UE are that:
1. The UE shall not shut its transmitter off before point B.
2. The UE shall shut its transmitter off before point C, which is Toff = 200 ms after point B.
3. The UE shall not turn its transmitter on between points C and E.
4. The UE shall turn its transmitter on before point F, which is Ton = 200 ms after point E.