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Low-power wireless multi-hop networks

  • US 8,514,758 B2
  • Filed: 12/13/2007
  • Issued: 08/20/2013
  • Est. Priority Date: 12/15/2006
  • Status: Expired due to Fees
First Claim
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1. A method of communication between a first, a second and a third node in a wireless multi-hop network, the method comprising:

  • bringing the first node and the second node respectively the third node in a fully operative mode for communication with each other, andsubsequently bringing the first node and the second node respectively the third node in a reduced operative mode where no communication with any other node is possible,wherein the method furthermore comprises;

    before bringing the respective node in the fully operative mode, bringing the respective node in a listening mode during a token listening period to check for presence of a wake-up token,bringing the respective node into the reduced operative mode if no wake-up token is received, and bringing the respective node into the fully operative mode for reception of data if a wake-up token is received, andwherein the method furthermore comprises synchronising the timing of the listening mode of the respective node with the timing of the transmitting of the wake-up tokens by another node, wherein synchronising includes one node transmitting a beacon signal and another node synchronising with the beacon signal,wherein the number of wake-up tokens, sent by the respective node during each time the respective other node is in said listening mode, is not more than a single wake-up token,wherein collisions of the wake-up tokens are reduced by using a collision avoidance scheme according to whichthe third node intending to send a wake-up token to the second node, having received a wake-up token sent from the first node to the second node cancels the wake-up token to the second node, andrespectively scheduling a first, second and third time slot selected among different time slots in a beacon period between two subsequent beacon signals,respectively allocating the token listening period of the second node to the first time slot, the token listening period of the third node to the second time slot and the token listening period of the first node to the third time slot.

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