Telefonaktiebolaget LM Ericsson (publ)
Method and apparatus for estimating channel quality

Abstract:

A method of estimating a channel quality of an uplink channel from a user equipment comprises receiving a measurement report from a user equipment, wherein the measurement report is based on at least one measurement made by the user equipment on a first downlink reference signal previously transmitted to the user equipment using a first downlink beamformer and at least one measurement made by the user equipment on a second downlink reference signal previously transmitted to the user equipment using a second downlink beamformer. The method comprises acquiring an estimate of a channel quality of a first uplink channel from the user equipment, in which a first uplink beamformer has been used to transmit a first uplink signal on the first uplink channel. The method comprises determining at least one transmission parameter for a future second uplink channel from the user equipment, in which a second uplink beamformer is to be used to transmit on the second uplink channel, wherein the at least one transmission parameter is determined based on the received measurement report and the acquired estimate of the channel quality of the first uplink channel.