Patent ID: 8509319

Claim:
A method for a wireless communication device to re-transmit a data transport block to a base station, the method comprising: receiving, at the wireless communication device, information of a precoding matrix from the base station wherein the precoding matrix comprises of a first precoding submatrix and a second precoding submatrix; transmitting a first data transport block from a first set of at least two antennas of the wireless communication device according to the first precoding submatrix and a second data transport block from a second set of at least two antennas of the wireless communication device according to the second precoding submatrix; receiving at the wireless communication device from the base station a retransmission request for the second data transport block; retransmitting from the wireless communication device to the base station the second data transport block according to a retransmission precoding matrix from at least one antenna of the first set of antennas and at least one antenna of the second set of antennas in response to the retransmission request, and retransmitting a first layer of the second data transport block from the first set of antennas according to the first precoding submatrix.