6.5.4 Power setting in uplink compressed mode

25.1013GPPRelease 17TSUser Equipment (UE) radio transmission and reception (FDD)

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

Compressed mode in uplink means that the power in uplink is changed.

6.5.4.1 Minimum requirement

A change of output power is required during uplink compressed frames since the transmission of data is performed in a shorter interval. The ratio of the amplitude between the DPDCH codes and the DPCCH code will also vary. The power step due to compressed mode shall be calculated in the UE so that the energy transmitted on the pilot bits during each transmitted slot shall follow the inner loop power control.

Thereby, the power during compressed mode, and immediately afterwards, shall be such that the mean power of the DPCCH follows the steps due to inner loop power control combined with additional steps of 10Log₁₀(N_pilot.prev / N_pilot.curr) dB where N_pilot.prev is the number of pilot bits in the previously transmitted slot, and N_pilot.curr is the current number of pilot bits per slot.

The resulting step in total transmitted power (DPCCH +DPDCH) shall then be rounded to the closest integer dB value. A power step exactly half-way between two integer values shall be rounded to the closest integer of greatest magnitude. The accuracy of the power step, given the step size, is specified in Table 6.8 in subclause 6.5.3.1. The 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, when neither the original timeslot nor the reference timeslot are in a transmission gap. The transient duration is not included, and is from 25μs before the slot boundary to 25μs after the slot boundary.

In addition to any power change due to the ratio N_pilot.prev / N_pilot.curr, the mean power of the DPCCH in the first slot after a compressed mode transmission gap shall differ from the mean power of the DPCCH in the last slot before the transmission gap by an amount Δ_RESUME, where Δ_RESUME is calculated as described in clause 5.1.2.3 of TS 25.214.

The resulting difference in the total transmitted power (DPCCH + DPDCH) shall then be rounded to the closest integer dB value. A power difference exactly half-way between two integer values shall be rounded to the closest integer of greatest magnitude. The accuracy of the resulting difference in the total transmitted power (DPCCH + DPDCH) after a transmission gap of up to 14 slots shall be as specified in Table 6.9.

Table 6.9: Transmitter power difference tolerance after a transmission gap of up to 14 slots

Power difference (Up or down) P [dB]	Transmitter power step tolerance after a transmission gap [dB]
Δ P ≤2	+/- 3
3	+/- 3
4 ≤ Δ P ≤10	+/- 3.5
11 ≤ Δ P ≤15	+/- 4
16 ≤ Δ P ≤20	+/- 4.5
21 ≤ Δ P	+/- 6.5

The power difference is defined as the difference between the mean power of the original (reference) timeslot before the transmission gap and the mean power of the target timeslot after the transmission gap, not including the transient durations. The transient durations at the start and end of the transmission gaps are each from 25μs before the slot boundary to 25μs after the slot boundary.

The mean power of successive slots shall be calculated according to figure 6.5.

Figure 6.5: Transmit template during compressed mode

6.5.4.1A Additional requirement for UL OLTD

For UE with two active transmit antenna connectors in UL OLTD operation, the minimum requirements specified in sub-clause 6.5.4.1 apply at each UE antenna connector.

6.5.4.1B Additional requirement for UL CLTD

The resulting step in total transmitted power (DPCCH + S-DPCCH +DPDCH for UE configured in UL CLTD activation state 1, and DPCCH + DPDCH for UE configured in UL CLTD activation state 2 or activation state 3) shall then be rounded to the closest integer dB value. A power step exactly half-way between two integer values shall be rounded to the closest integer of greatest magnitude. The accuracy of the power step at each transmit antenna connector, given the step size, is specified in Table 6.8 in subclause 6.5.3.1. The 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, when neither the original timeslot nor the reference timeslot are in a transmission gap. The transient duration is not included, and is from 25μs before the slot boundary to 25μs after the slot boundary.

The resulting difference in the total transmitted power (DPCCH + S-DPCCH + DPDCH for UE configured in UL CLTD activation state 1, and DPCCH + DPDCH for UE configured in UL CLTD activation state 2 or activation state 3) shall then be rounded to the closest integer dB value. A power difference exactly half-way between two integer values shall be rounded to the closest integer of greatest magnitude. The accuracy of the resulting difference in the total transmitted power (DPCCH + S-DPCCH + DPDCH for UE configured in UL CLTD activation state 1, and DPCCH + DPDCH for UE configured in UL CLTD activation state 2 or activation state 3) after a transmission gap of up to 14 slots shall be as specified in Table 6.9 at each transmit antenna connector.

The power difference at each transmit antenna connector is defined as the difference between the mean power of the original (reference) timeslot before the transmission gap and the mean power of the target timeslot after the transmission gap, not including the transient durations. The transient durations at the start and end of the transmission gaps are each from 25μs before the slot boundary to 25μs after the slot boundary.The mean power of successive slots shall be calculated according to figure 6.5.

6.5.4.1C Additional requirement for DB-DC-HSUPA

For UE supporting DB-DC-HSUPA operation, the minimum requirements specified in sub-clause 6.5.4.1 apply for the primary carrier.