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Peer to peer ranging exchange

  • US 10,225,338 B1
  • Filed: 04/15/2015
  • Issued: 03/05/2019
  • Est. Priority Date: 04/15/2014
  • Status: Active Grant
First Claim
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1. A method for discovering devices in a peer to peer (P2P) wireless communication network, the method comprising:

  • during a search state of a first communication device, transmitting, by the first communication device, a first probe request on a first channel included in a plurality of channels, wherein the search state (i) is one of a plurality of different states in which the first communication device is configured to operate, and (ii) corresponds to a contiguous time period in which the first communication device is configured to transmit multiple probe requests on different channels among the plurality of channels;

    during the search state, receiving, by the first communication device, a first probe response transmitted by a second communication device on the first channel;

    in response to receiving the first probe response, performing, by the first communication device, a ranging exchange with the second communication device;

    during an advertise state of the first communication device, listening, by the first communication device, for probe requests on a second channel included in the plurality of channels, wherein the advertise state corresponds to another contiguous time period in which the first communication device is configured to listen for probe requests on a single channel, and wherein a duration of the other contiguous time period is randomly or pseudo-randomly determined by the first communication device;

    during the advertise state, transmitting, by the first communication device, a second probe response to a second probe request transmitted by a third communication device on the second channel if the second probe request is received on the second channel during the advertise state;

    during the advertise state and in response to the second probe request, listening, by the first communication device, for probe requests on the second channel and for a ranging request transmitted by the third communication device; and

    during the advertise state and in response to the ranging requesttransmitting, by the first communication device, a first action frame having a dialog token for a fine timing measurement exchange, andstoring, by the first communication device, a first departure time indicator for the first action frame.

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