Patent ID: 8565175
Filing Date: 2013-10-22
Classification: H04B,H04W

Abstract:
1. A method for use in a multiple-input multiple-output wireless communication system in which: a plurality of base stations are provided each of which can transmit signals to, and receive signals transmitted from, one or more user equipments; the base stations are organized into a plurality of groups; in a given group of base stations serving one or more user equipments, those serving base stations coordinate with each other to simultaneously transmit signals to the one or more served user equipments, and one or more of the served user equipments feed back information to one or more of those serving base stations, wherein said information incorporates inter-group noise information related to interference between different base station groups, the method comprising: processing signals for simultaneous transmission from base stations of a group of the plurality of groups to one or more user equipments served by that group, said processing using the inter-group noise information fed back to the base station(s) of that group to improve transmission capacity, wherein a noise-related parameter is defined which incorporates the inter-group noise information which, includes noise power Ĩ the processing involves using the noise-related parameter to precode signals for simultaneous transmission from base stations of a group to one or more user equipments served by that group, information fed back by the one or more of the served user equipments further includes noise power Ñ the noise-related parameter, μ, is calculated using an equation equivalent to the following: where N the precoding of signals for simultaneous transmission from the base stations of the group to one or more user equipments served by the group involves calculating a precoding matrix F using an equation equivalent to the following: