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Method and apparatus for channel state information (CSI) reporting in a massive MIMO communications system

  • US 10,277,296 B2
  • Filed: 02/16/2017
  • Issued: 04/30/2019
  • Est. Priority Date: 02/16/2017
  • Status: Active Grant
First Claim
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1. A method of channel state information (CSI) acquisition in a multiple input/multiple output (MIMO) communication system, comprising the steps at a user equipment (UE) of:

  • receiving from a base station (BS) a set of beamformed downlink (DL) reference signals (DL-RSs);

    selecting a subset of said set of beamformed DL-RSs;

    acquiring CSI for only said selected subset of said set of beamformed DL-RSs; and

    communicating to said BS an indication of said selected subset of said set of beamformed DL-RSs and the CSI acquired for said selected subset of said set of beamformed DL-RSs;

    wherein the step of communicating to said BS an indication of said selected subset of said set of beamformed DL-RSs comprises communicating a selected subset indication value (SSIV) derived from a number of contiguous DL-RSs forming the selected subset and an identity of a DL-RS at a starting edge of the contiguous subset with respect to an antenna port number.

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