Patent ID: 8503388

Claim:
A base station apparatus communicating with a user equipment terminal using a downlink shared channel, the base station apparatus comprising: a first offset value calculation unit configured to calculate a first offset value to be applied to downlink radio quality information reported from the user equipment terminal, wherein the first offset value is calculated based on acknowledgement information and downlink required quality, and wherein the acknowledgement information relates to the downlink shared channel; a second value calculation unit configured to calculate a second offset value to be applied to the downlink radio quality information, wherein the second offset value is calculated based on priority levels determined depending on data types; a transmission format determination unit configured to determine a transmission format of the downlink shared channel based on the downlink radio quality information to which the first offset value and the second offset value are applied; and a transmission unit configured to transmit the downlink shared channel using the determined transmission format of the downlink shared channel.