METHOD AND A SYSTEM FOR HIERARCHICAL TIME SYNCHRONISATION IN AN AD-HOC NETWORK

摘要

In a method and in a system for time synchronization within a mobile ad-hoc network, every node (31, 32, 33, 34, 35, 36, 37, 38) of the mobile ad-hoc network transmits a message signalling a presence (1), in each case within a given time frame. The received message signalling a presence (1) is acknowledged by every node (31, 32, 33, 34, 35, 36, 37, 38) disposed within the transmission range of the transmitting node (31, 32, 33, 34, 35, 36, 37, 38), in each case with an acknowledgement message (2). On the basis of the information in an acknowledgement message (2) which one of the two nodes (31, 32, 33, 34, 35, 36, 37, 38) receives, that node (31, 32, 33, 34, 35, 36, 37, 38) of two nodes (31, 32, 33, 34, 35, 36, 37, 38) disposed within the transmission range of one another is specified, with the local time of which the respectively other node (31, 32, 33, 34, 35, 36, 37, 3831, 32, 33, 34, 35, 36, 37, 38) synchronizes its local time.

主权项

1. A method for time synchronization in a mobile ad-hoc network, comprising:
transmitting by every node of the mobile ad-hoc network of a message signalling a presence, in each case within a given time frame, acknowledging by every node disposed within the transmission range of the transmitting node of the received message signalling a presence, in each case with an acknowledgement message, specifying of that node of two nodes disposed within the transmission range of one another with the local time of which the respectively other node synchronizes its local time, on the basis of information in an acknowledgement message which is received by one of the two nodes and synchronizing of the local time of the nodes with the local time of the respective specified node.