Patent ID: 8885569
Filing Date: 2014-11-11
Classification: H04B,H04J,H04L,H04W

Abstract:
1. A method comprising: a) receiving, by a first base station from a second base station, at least one application protocol message, said first base station and said second base station configured to communicate with wireless devices employing a downlink carrier, said downlink carrier comprising a plurality of resource blocks, said at least one application protocol message comprising a downlink beamforming information element for at least one resource block in said downlink carrier, said downlink beamforming information element indicating a second beamforming codeword employed by said second base station for said at least one resource block, said second beamforming codeword included in a second beamforming codebook; b) computing, by said first base station, a channel state input information element for a wireless device based on, at least in part, processing said downlink beamforming information element; and c) transmitting, by said first base station, said channel state input information element to said wireless device for computing a precoding matrix indicator; and d) receiving, by said first base station, a channel state feedback from said wireless device, said channel state feedback comprising said precoding matrix indicator.