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 in a wireless access system supporting a carrier aggregation, the method performed by a user equipment (UE) and comprising:
transmitting a physical uplink shared channel (PUSCH) only in a predetermined subframe even though the UE is configured to transmit the PUSCH simultaneously with a physical uplink control channel (PUCCH); calculating a power headroom value on the predetermined subframe considering both a transmission power of the PUSCH and a transmission power of the PUCCH; and reporting the power headroom value to the base station, wherein the power headroom value is calculated by using:PH⁡(i)=PCMAXc-10⁢log10⁡(10PPUSCH⁢⁢c⁢⁢_⁢⁢scheduled⁡(i)⁢/⁢10+10(PO⁢⁢_⁢⁢PUCCH⁡(j)+PL+g⁡(i))⁢/⁢10), where PCMAXc represents a maximum transmission power of the UE, PPUSCH—scheduled(i) represents the transmission power of the PUSCH, PO—PUCCH(j) is an open-loop parameter of the PUCCH, PL is a path loss compensation value, g(i) is a closed-loop parameter value, ‘i’ is an index of the predetermined subframe, and ‘c’ is an index of a primary cell.