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System and method for message acknowledgment feedback for device-to-device communication overlaid on a cellular network

  • US 9,319,200 B2
  • Filed: 08/26/2014
  • Issued: 04/19/2016
  • Est. Priority Date: 02/27/2012
  • Status: Active Grant
First Claim
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1. A method of operating a communications controller for a direct mobile communication (DMC) link for a group of user equipments (UEs), the method comprising:

  • allocating, by the communications controller, a set of subframes to the group of UEs for the DMC link;

    signaling, by the communications controller, the set of allocated subframes to the group of UEs; and

    indicating, by the communications controller, a length of a sliding window to the group of UEs for UEs of the group of UEs to aggregate acknowledgment and negative acknowledgement (ACK/NACK) feedback for communications over the DMC link according to the length of the sliding window, wherein the aggregated ACK/NACK feedback includes individual ACKs and NACKs for respective hybrid automatic repeat request (HARQ) processes within the sliding window, andwherein the ACK/NACK feedback for the communications over the DMC link is determined independently from ACK/NACK feedback for cellular transmission between the communication controller and the group of UEs.

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