Patent ID: 6768730
Filing Date: 2004-07-27
Classification: G01S,H04W

Abstract:
A communication node, adapted for use in a communications network, comprising:a transceiver, adapted to transmit and receive messages to and from other nodes in said network over at least one of a plurality of shared data channels, and being tunable to a reservation channel to monitor channel access reservation messages transmitted by said other nodes in said network; and a controller, adapted to control said transceiver to transmit a range request message to at least one other of said nodes in said network over said reservation channel and to receive a range reply message from said at least one other node over said reservation channel in response to said range request message, to enable said controller to determine a distance of said communication node from said at least one other node based on said range request message and said range reply message, said range request message being configured to indicate to at least said one other node that said transceiver and a transceiver of said one other node are not tuning to a data channel as a result of an exchange of said range request message and said range reply message.