Patent ID: 8744006

Claim:
A method implemented in a user equipment of a radio communications system to send uplink control information from the user equipment to a serving node of the radio communications system, the user equipment having a transmission port for each of at least two transmit diversity antennas, each antenna transmitting in uplink slots of an uplink subframe, each slot having a plurality of transmission frequency subcarriers, the method comprising: encoding uplink control information bits into symbols; splitting the encoded symbols into at least four groups of symbols for use to achieve diversity transmission; phase shifting two of the at least four groups of symbols to provide a frequency shift of one subcarrier; cyclically repeating each of the at least four groups of symbols to generate a repeated group for each of the at least four groups of symbols; and mapping the repeated groups each to different transmission ports of the user equipment for diversity transmission as uplink control information through a plurality of uplink transmission slots of the uplink subframe.