The invention concerns a 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, characterized in 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.
The invention also concerns a communication device in a TDMA communication network.