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System and method for correcting the clock drift and maintaining the synchronization of low quality clocks in wireless networks

  • US 7,072,432 B2
  • Filed: 07/05/2002
  • Issued: 07/04/2006
  • Est. Priority Date: 07/05/2002
  • Status: Expired due to Term
First Claim
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1. A method for controlling clock synchronization between at least two nodes of a plurality of nodes in an ad-hoc wireless network, comprising:

  • controlling a client node of said plurality of nodes to select a reference node from said plurality of nodes and to send to said reference node a first communication, said client node having a client clock and said reference node having a reference clock;

    controlling said reference node to receive said first communication and in response, send a first reply to said client node;

    controlling said client node to receive said first reply and in response, send a second and third communication to said reference node; and

    controlling said reference node to receive said second and said third communications and in response, calculate a first clock shift and propagation value existing between said client node and said reference node, and send information pertaining to said first clock shift and said propagation value to said client node in a second reply.

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