Patent ID: 8385246

Claim:
A method of controlling downlink transmission from a base station having multiple antennas to a mobile station having multiple antennas, comprising the steps of: applying an open loop-type Multiple Input Multiple Output (MIMO) diversity to one or more common control channels, a Multimedia Broadcast Multicast Service (MBMS) channel, and an L1/L2 control channel; and applying a closed loop-type MIMO multiplexing and/or MIMO diversity to a shared data channel, wherein the MIMO multiplexing further includes multiplying a pre-encoding vector with a transmit signal, and wherein, when transmitting the shared data channel, the number of streams in the MIMO multiplexing is controlled for a distributed-transmission type user, to which sub-carriers are allocated over a whole bandwidth, based on an average channel state of the whole bandwidth, wherein the pre-encoding vector for each of the streams has a fixed value.