Method and apparatus for supporting uplink transmit diversity

摘要

The present invention relates to a method and a user equipment for use in a wireless communication system that allow for improved uplink transmit diversity performance by using downlink measurements for making informed decisions on whether or not to change precoding vector for uplink transmission. The user equipment measures (32) downlink characteristics, such as received power, on a plurality of antennas of the user equipment. Based on the measured downlink characteristics a precoding vector for unlink transmission is determined (38). The determined precoding vector is then used to perform uplink transmission (31).

主权项

1. A method for uplink transmit diversity in a user equipment operating in a wireless communications system having a downlink and an uplink operated in a Frequency Division Duplex (FDD) mode, the method comprising:
measuring downlink characteristics on each of a plurality of antennas of the user equipment; receiving uplink feedback information from the wireless communication network, for one or more uplink transmissions sent from the user equipment using a selected one among a plurality of precoding vectors, each precoding vector comprising transmission antenna weights for the plurality of antennas; and determining whether to change from the selected precoding vector to another precoding vector, based on the measured downlink characteristics and the uplink feedback information.