Methods and arrangements for signaling control information in a communication system

A base station for communicating with a user equipment over a radio channel, the base station comprising:

• a receiver for receiving feedback data from the user equipment, wherein the feedback data comprise an indication of a recommended precoder for each subband and a recommended transmission rank;
• and
• a transmitter for transmitting to the user equipment a message, wherein the message includes a confirmation that transmission of data from the base station is using the recommended precoder, and an indicator of the transmission rank to be used, wherein said indicator also indicates which column or columns of the recommended precoder to use to support the transmission rank to be used, and the same column number or column numbers are indicated for each precoder, wherein
• the message is coded with a message number.

A method for communicating between a user equipment and a base station over a radio channel, the method comprising:

• determining a recommended precoder and a recommended transmission rank to possibly use when transmitting data from a base station;
• transmitting feedback data to the base station, wherein the feedback data comprise an indication of one recommended precoder for each subband and the recommended transmission rank;
• and
• receiving from the base station a message coded with a message number, wherein the message includes
• a confirmation that transmission of data from the base station is using the recommended precoder, and
• an indicator of the transmission rank to be used, wherein said indicator also indicates which column or columns of the recommended precoder to use to support the transmission rank to be used, wherein the same column number or column numbers are indicated for each precoder.