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Method and device for time synchronization in a TDMA multi-hop wireless network

  • US 20090323669A1
  • Filed: 06/25/2009
  • Published: 12/31/2009
  • Est. Priority Date: 06/25/2008
  • Status: Active Grant
First Claim
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1. Method for synchronizing clocks of a set of nodes in a TDMA (“

  • Time Division Multiple Access”

    ) communication network comprising a plurality of nodes, among which some called time reference (TR) nodes are synchronized to a common time reference through a predetermined out-of-band synchronization mechanism, other nodes being called non-TR nodes, each node comprising an internal clock, wherein that it comprises the steps of;

    transmitting, at the level of at least one of said TR nodes, a broadcast beacon packet during a given time slot of sub-frames, each sub-frame comprising a plurality of time slots;

    propagating among the remaining nodes said beacon packet using the slotted structure of the TDMA protocol, each node being pre-assigned a conflict-free time slot in a sub-frame to broadcast said beacon packet received from another node in a previous slot of said sub-frame; and

    updating in at least two of said non-TR nodes the internal clock based on an updated offset estimate, upon reception of said beacon packet.

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