Patent ID: 7627347
Filing Date: 2009-12-01
Classification: H04W

Abstract:
1. A base station of a telecommunication system, comprising: a communication interface comprising a plurality of antennas for enabling data transmission through a plurality of spatial subchannels, and a processing unit configured to: initialize a base station beamforming configuration defining a plurality of spatial subchannels for uplink and downlink communication, allocate the plurality of spatial subchannels to one or more user entities, obtain for each user entity a channel state information describing the correlation, and thereby interference, between different spatial subchannels, obtain for each user entity a user entity beamforming configuration configuring each user entity to transmit and receive data through the spatial subchannel or spatial subchannels allocated to the corresponding user entity, calculate an uplink power allocation configuration on the basis of the previously updated user entity beamforming configuration, the channel state information, and the previously updated base station beamforming configuration, update the base station beamforming configuration by utilizing the information on correlation between spatial subchannels comprised in the channel state information of each spatial subchannel and the previously calculated user entity beamforming configuration and uplink power allocation configuration, thereby mitigating interference between different subchannels calculate a downlink power allocation configuration on the basis of the previously updated base station beamforming configuration, the channel state information, and the user entity beamforming configuration, update the base station beamforming configuration by utilizing the information on correlation between spatial subchannels comprised in the channel state information of each spatial subchannel and the previously calculated user entity beamforming configuration and uplink power allocation configuration, thereby mitigating interference between different subchannels; repeat the operations of calculating the uplink power allocation configuration, updating the base station beamforming configuration, calculating the downlink power allocation configuration, updating the user entity beamforming configuration a given number of times according to a specific criterion, and utilize, after the completion of the last iteration, at least one of the following in configuring data transmission parameters: last update of the base station beamforming configuration in configuring the base station to transmit and receive data through the plurality of spatial subchannels, the downlink power allocation configuration in configuring the base station transmit power levels for the spatial subchannels, the last update of the user entity beamforming configuration in configuring each user entity to transmit and receive data through the one or more spatial subchannel allocated to the corresponding user entity, and the uplink power allocation configuration in configuring each user entity to transmit and receive data through the one or more spatial subchannels allocated to the corresponding user entity.