Patent ID: 9055564
Filing Date: 2015-06-09
Classification: H04W

Abstract:
1. A method of a User Equipment (UE) transmitting a power headroom report in a multiple component carrier system, the method comprising: calculating Combination Power Headroom (CPH) which is power headroom calculated in a UE-specific way based on uplink transmission through a plurality of component carriers configured in the UE; generating CPH information used to inform an eNodeB (eNB) of the CPH; transmitting the CPH information to the eNB; and determining whether a triggering condition is satisfied before calculating the CPH, the triggering condition being satisfied when the UE enters a state in which the UE sends the CPH information, wherein the CPH information comprises a combination indication field indicating a combination, composed of the plurality of component carriers, and a Combination Power Headroom Field (CPHF) indicating the CPH, and wherein the triggering condition is determined to be satisfied when a configuration of the plurality of component carriers configured in the UE is changed, when a timer for triggering the transmission of the CPH information expires, when a power headroom report for one of the plurality of component carriers configured in the UE is triggered, or when a scaling count indicating a number of times that an uplink transmission power of the UE exceeds an uplink maximum transmission power is equal to a predetermined threshold, or the triggering condition is determined to be satisfied based on a result obtained by comparing a variance of a value of a combination power coordination regarding the plurality of component carriers, configured in the UE, with a predetermined threshold.