Patent ID: 8077664
Filing Date: 2011-12-13
Classification: H04L

Abstract:
1. An arrangement of processing circuits in one or more fixed nodes of a mobile communications network using coordinated transmissions from multiple transmitter sites, the arrangement of processing circuits comprising: one or more memory circuits storing a set of antenna precoding vectors, wherein each antenna precoding vector is indexed by a group index and by a vector index; one or more precoding selector circuits configured to estimate path loss between a mobile station and each of a plurality of geographically separated transmitter sites, each transmitter site having at least one transmitter antenna; and to select one of a plurality of pre-determined subsets of the set of antenna precoding vectors, based on the estimated path losses; and one or more controller circuits configured to transmit a first group index to the mobile station via one or more of the geographically separated transmitter sites, the first group index identifying the selected subset of antenna precoding vectors; to receive a first vector index from the mobile station, the first vector index corresponding to a first antenna precoding vector in the selected subset; and to transmit first data to the mobile station, using the first antenna precoding vector applied to the transmitter antennas at the plurality of geographically separated transmitter sites.