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Reference signals and link adaptation for massive MIMO

  • US 10,505,597 B2
  • Filed: 05/02/2017
  • Issued: 12/10/2019
  • Est. Priority Date: 05/09/2016
  • Status: Active Grant
First Claim
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1. A method for wireless communications by a user equipment (UE), comprising:

  • transmitting one or more sounding reference signals (SRS) and at least one of;

    feedback regarding interference or a whitening matrix to a base station (BS), wherein the one or more SRS is transmitted in an uplink portion of a first subframe;

    receiving one or more beamformed channel state information reference signals (CSI-RS) from the BS, wherein the one or more beamformed CSI-RS is received in a downlink portion of a second subframe, and wherein an amount of resources in the second subframe allocated for downlink transmissions is greater than an amount of resources allocated for uplink transmissions in the second subframe;

    determining CSI feedback based on the beamformed CSI-RS;

    transmitting the CSI feedback to the BS;

    receiving data in a downlink portion of a third subframe;

    receiving another CSI-RS in a downlink portion of a fourth subframe if a negative acknowledgement (NACK) for the data is transmitted; and

    receiving a retransmission of the data in a downlink portion of a fifth subframe in response to the NACK, wherein the fifth subframe comprises a downlink-centric subframe, wherein an amount of resources allocated for downlink transmissions in the fifth subframe is greater than an amount of resources allocated for uplink transmissions in the fifth subframe.

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