Patent ID: 9014031
Filing Date: 2015-04-21
Classification: H04L,H04W

Abstract:
1. A mobile station apparatus which communicates with a base station apparatus by using a plurality of uplink component carriers and a plurality of downlink component carriers, the mobile station apparatus comprising: a reception unit configured to receive, from the base station apparatus, information indicating one or more downlink component carriers used for measurement of a path loss, and information indicating a correspondence between the downlink component carriers and the uplink component carrier; a transmission power control unit configured to calculate a power headroom value for each of all the plurality of uplink component carriers; a power headroom control unit configured to trigger a power headroom report in case that the path loss for at least one of the one or more downlink component carriers used for measurement of the path loss has changed more than a predetermined value; the power headroom control unit is configured to instruct a transmission unit to transmit the power headroom value for each of all the plurality of uplink component carriers in case that at least one uplink radio resource for initial transmission is assigned to the mobile station apparatus and the power headroom report has been triggered and the power headroom control unit determines to transmit the power headroom value for each of all the plurality of uplink component carriers through the at least one uplink radio resource for initial transmission on the basis of a priority; and the transmission unit is configured to transmit the power headroom value for each of all the plurality of uplink component carriers through the at least one uplink radio resource for initial transmission; wherein in a case that the transmission unit transmits a physical uplink shared channel in a certain subframe for a certain uplink component carrier, the power headroom value for the certain uplink component carrier is calculated on the basis of a number of physical resource blocks assigned for a transmission of the physical uplink shared channel in the certain subframe for the certain uplink component carrier, and in a case that the transmission unit does not transmit the physical uplink shared channel in the certain subframe for the certain uplink component carrier, the power headroom value for the certain uplink component carrier is calculated by assuming that one physical resource block is assigned for the transmission of the physical uplink shared channel in the certain subframe for the certain uplink component carrier.