Method and apparatus for controlling uplink power in a wireless access system

摘要

According to one embodiment of the present invention, a method for reporting power headroom in a user equipment of a multi-carrier system, includes receiving a physical downlink control channel (PDCCH) signal comprising uplink resource allocation information from a base station; transmitting at least one of a physical uplink shared channel (PUSCH) signal and a physical uplink control channel (PUCCH) signal to the base station in a predetermined subframe based on the uplink resource allocation information in accordance with a transmission mode; calculating one or more power headroom values for the predetermined subframe in accordance with the transmission mode; and transmitting a report message comprising the one or more power headroom values to the base station, wherein the user equipment reports its first and second type power headroom values when operating in transmission mode A, or reports its first type power headroom value when operating in transmission mode B.

主权项

1. A method for reporting power headroom information at a user equipment (UE) in a wireless access system that supports a carrier aggregation, the method comprising:
receiving a physical downlink control channel (PUCCH) including resource allocation information related to a predetermined subframe; calculating first power headroom information related to a simultaneous transmission of a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) on the predetermined subframe if the UE is configured with a transmission mode A, or second power headroom information related to a transmission of a PUSCH on the predetermined subframe if the UE is configured with a transmission mode B; and transmitting the first power headroom information or the second power headroom information according to the transmission mode A or B, wherein the first power headroom information is calculated by using:PHSUM⁡(i)=PCMAXc-10⁢log10⁡(10PPUSCHc⁢⁢_⁢⁢scheduled⁡(i)/10+10PPUCCH⁢⁢_⁢⁢scheduled⁡(i)/10), where PCMAXc represents a maximum transmission power of the UE, PPUSCH—scheduled(i) represents a transmission power for the PUSCH, and PPUCCH—scheduled(i) represents a transmission power for the PUCCH, and wherein ‘i’ is an index of the predetermined subframe and ‘c’ is an index of a serving cell.