How is an Inner Loop Power Measurement Made?
Inner loop power control in the uplink is the ability of the UE to adjust its output power in accordance with one or more TPC (transmit power control) commands received in the downlink. When the UE is not in soft handover, only one TPC command is received in each timeslot. The UE’s output power changes in response to a single TPC command, TPC_cmd, derived at the UE based on the power control algorithm. TPC_cmd, along with the power control step size, determines the UE transmit output power. The power change is applied in the timeslot adjacent to the timeslot in which the TPC command is received. For example, the power change derived from a TPC command in the 10th timeslot is applied to the 11th timeslot. The inner loop power measurement is made through a root-raised cosine (RRC) filter with a roll off of alpha=0.22 and a bandwidth equal to the chip rate (3.84 MHz). The test set measures the mean power in each timeslot, excluding the transient duration. The transient duration is from 25
