Patent ID: 7391831

Claim:
A method for controlling a Node B to change a Transmit Diversity scheme to another scheme in a mobile communication system including the Node B for transmitting data using the Transmit Diversity scheme and a Mobile Station (MS) for transmitting weights of antennas to the Node B to provide the Node B with maximum Transmit Diversity performance, such that it can implement a maximum Transmit Diversity, the method comprising the steps of: determining whether there is a mode transition in the Transmit Diversity scheme upon receiving Transmit Diversity information, wherein the mode transition comprises a transition between a Mode 1 scheme and a Mode 2 scheme comprised in an open loop transmit diversity scheme or a Mode 1 scheme and a Mode 2 scheme comprised in a closed loop transmit diversity scheme, or a transition between the open loop transmit diversity scheme and the closed loop transmit diversity scheme; generating weights associated with individual antennas using a predetermined relationship between weights selected for use depending on the determined mode transition, if it is determined that the mode transition occurs in the Transmit Diversity scheme; transmitting data using the generated weights; and associating a weight of a Transmit Diversity scheme used before the mode transition with a weight of a Transmit Diversity scheme to be used after the mode transition, such that the weights of the Transmit Diversity schemes are positioned in a same quadrant included in a constellation indicative of weight information.