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Ad hoc communication system

  • US 8,462,691 B2
  • Filed: 03/28/2008
  • Issued: 06/11/2013
  • Est. Priority Date: 03/30/2007
  • Status: Active Grant
First Claim
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1. A method of operating an opportunistic relaying network comprising at least one network access point, and a plurality of mobile wireless data relay devices each having a buffer for storing data messages, whether own-generated or received, such stored data messages being referred to hereafter as payload data, the method comprising:

  • at a source one of said devices having payload data to be relayed to a network access point, the network access point being out of range of the source device,(a) transmitting a request to transmit (RTS), in respect of payload data;

    (b) receiving, from each said device within range of the source device and responding to the transmitted RTS, respective device-related status data comprising an indication of its buffer vacancy;

    (c) selecting in accordance with an opportunistic routing algorithm, a responding device to receive payload data;

    (d) setting the period of a retransmission timer to be a minimum value multiplied by an inverse function of the buffer vacancy of the selected device;

    (e) transmitting payload data to the selected device;

    (f) triggering, upon that transmission, the retransmission timer; and

    (g) upon expiry of the retransmission timer period,repeating steps (a) to (f) in respect of any transmitted payload data for which acknowledgment generated by a network access point has not been received.

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