WIRELESS COMMUNICATION BASE STATION APPARATUS AND CHANNEL ALLOCATION METHOD

摘要

A wireless communication base station apparatus by which data transmission efficiency can be improved. In the apparatus, a PDCCH allocation unit (101) allocates inputted uplink allocation information (#1 to #K) to PDCCHs from PDCCH #1 to PDCCH #K, an ACK/NACK channel allocation unit (105) allocates a response signal to be sent to each mobile station to the ACK/NACK channel that is associated with the CCE whose CCE number is the largest among the CCEs that constitute the PDCCH to which the uplink allocation information on the mobile station is allocated, and an arrangement unit (106) arranges the ACK/NACK channel to which the response signal is allocated to the downlink resource ensured for the ACK/NACK channel.