Patent ID: 8804609

Claim:
A method in a base station for operating a hybrid automatic repeat request (H-ARQ) enabled OFDM (orthogonal frequency multiplexing) connection with a wireless terminal, the method comprising: for each transmission resource allocation, the base station: sending, for reception by the wireless terminal, information of where a H-ARQ transmission is located in a data frame; sending an identification of the H-ARQ transmission, and wherein the wireless terminal is a MIMO enabled wireless terminal and for enabling the H-ARQ transmission in an up-link (UL) direction from the wireless terminal to the base station, the method further comprising for each transmission resource allocation, the base station: identifying the H-ARQ transmission as being performed by one of a collaborative spatial multiplexing transmission and a non-collaborative spatial multiplexing transmission using a collaborative spatial multiplexing indication; and sending the collaborative spatial multiplexing indication.