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Fast modulation and coding scheme adaptation protocol for long term evolution with multiple-user multiple input, multiple output

  • US 9,609,564 B2
  • Filed: 10/10/2013
  • Issued: 03/28/2017
  • Est. Priority Date: 11/01/2012
  • Status: Active Grant
First Claim
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1. A method for providing fast modulation and coding scheme adaptation for LTE, comprising:

  • sending, by a node, channel state information reference signals to user equipment;

    receiving, by the node, first channel quality indication feedback from the user equipment based on the channel state information reference signals;

    transmitting physical downlink shared channel data and demodulation reference signals using a first modulation and coding scheme based on the first channel quality indication feedback;

    receiving second channel quality indication feedback based, at least in part, on measurements performed by the user equipment on the demodulation reference signals; and

    transmitting physical downlink shared channel data using a second modulation and coding scheme based on the second channel quality indication feedback,wherein sending the physical downlink shared channel data and demodulation reference signals comprises sending the physical downlink shared channel data and demodulation reference signals together using physical downlink shared channel beam-forming, andthe second channel quality indication feedback comprises one of;

    channel quality indication reporting feedback that is based, at least in part, on measurements performed on the demodulation reference signals free from an indication to change the modulation and coding scheme,an explicit request to apply a particular modulation and coding scheme that is determined by the user equipment and is based, at least in part, on the measurements performed on the demodulation reference signals, ordelta feedback that comprises channel quality changes since a last measurement that the user equipment performed.

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