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METHOD AND APPARATUS FOR A CLUSTER SPECIFIC CLOUD RADIO TRANSMISSION AND RECEPTION

  • US 20180019899A1
  • Filed: 01/19/2017
  • Published: 01/18/2018
  • Est. Priority Date: 07/14/2016
  • Status: Active Grant
First Claim
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1. A method implemented in a cloud radio access network (C-RAN), the method comprising:

  • transmitting a channel state information (CSI) reference signals to a plurality of user equipments (UEs);

    receiving a measured downlink (DL) CSI from each UE among the plurality of UEs, wherein the DL CSI corresponds to a plurality of antenna ports associated with a set of remote radio heads (RRHs) in a cluster;

    estimating an uplink (UL) CSI for each UE antenna port, wherein the UL CSI is estimated using a pre-defined pilot structure received from each UE; and

    deriving a calibration coefficient for each RRH and UE antenna port pair based on the measured DL CSI and the estimated UL CSI.

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