Base station and transmission method

A communication system comprising a base station and a communication terminal based on a multi-carrier system using a frequency bandwidth including a plurality of resource blocks, each of the plurality of resource blocks including one or more sub-carriers, wherein the base station comprises:

• a frequency scheduler configured to determine scheduling information for allocating one or more of the plurality of resource blocks to a communication terminal;
• a multiplexing unit configured to multiplex the control channel into a single radio frame based on a number of control channels allocated into the single radio frame to use a lower coding rate by repeatedly transmitting without changing encoding method and further multiplex a channel other than the control channels in accordance with the scheduling information;
• and
• a transmission unit configured to transmit an output signal from the multiplexing unit based on the multi-carrier system.