Patent ID: 8416872

Claim:
A radio communication apparatus that includes a plurality of antennas, comprising: a receiving unit configured to receive a notice signal from a communication partner; a plurality of units configured to adjust the number of data sequences according to each of two or more transmission methods including a MIMO multiplexing method, a MIMO diversity method, and an adaptive array antenna method, and to couple with the two or more antennas; a selecting unit configured to select at least one of the plurality of units based on the notice signal; and a transmitting unit configured to notify the communication partner of the transmission method corresponding to the selected unit and transmit data according to the selected unit, wherein the transmitting unit performs adaptive modulation independently for each transmitting block and performs HARQ processing independently for each transmitting block, when the data are transmitted according to the MIMO multiplexing method, wherein the transmitting unit transmits as a control channel for each group into which the plurality of antennas are divided based on a channel state: information about at least one of a bit for AMC, a bit for HARQ, a bit for scheduling, and a bit for CQI for MIMO, at least one of a modulation scheme and transport block information expressed as an absolute value, as the bit for AMC for a first antenna, at least one of a modulation scheme and transport block information expressed as a difference value relative to the first antenna, as the bit for AMC for a second antenna, at least one of HARQ process information, a redundant version, a constellation pattern version, and information indicating whether the data are new as the bit for HARQ, a CQI bit expressed as an absolute value, as the bit for CQI for MIMO for the first antenna, a CQI bit expressed as a difference value relative to the first antenna, as the bit for CQI for MIMO for the second antenna, and frequency block assignment information as the control channel.