Patent ID: 9094926
Filing Date: 2015-07-28
Classification: H04L,H04W

Abstract:
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: where P wherein ‘i’ is an index of the predetermined subframe and ‘c’ is an index of a serving cell.