Patent ID: 7974264

Claim:
A method for determining the propagation delays between nodes in a network, the network including a plurality of nodes, the method comprising the procedures of: recording by each one of said nodes the transmission time of a beacon-signal respective of said one of said nodes and the reception times of other beacon-signals respective of other nodes, said beacon signal and said other beacon signals being transmitted according to a forward transmission sequence; determining a reverse transmission sequence according said forward transmission sequence; repeating said procedure of recording for beacon signals transmitted according to said reverse transmission sequence; and determining a propagation delay between each pair of communicating nodes according to a forward propagation delay and a reverses propagation delay respective of said each of pair of communicating nodes, said forward propagation delay and said reverse propagation delay being determined according to the recorded times of transmissions and receptions of said beacon signals by the respective nodes, wherein said pair of communicating nodes are defined as a pair of nodes that can receive transmissions of each other, and wherein the time difference between transmissions of beacon signals respective of two nodes, during said forward transmission sequence, is substantially the same as the time difference between transmissions of said beacon signals respective of said two nodes, during said reverse transmission sequence.