US Patent 8995300 Beamforming signaling in a wireless network

A wireless receives at least one channel state input information element (IE) from a first base station. The wireless device computes a precoding matrix indicator (PMI) employing, at least in part, the at least one channel state input IE and measurement of signals received at least from at least one antenna port of a second base station. The wireless device transmits channel state information comprising the PMI to the first base station. The wireless device receives at least one data packet employing beamforming according to a precoding matrix identified by the PMI.