MECHANISM FOR DETECTING INTRUSION AND JAMMING ATTEMPTS IN A SHARED MEDIA BASED COMMUNICATIONS NETWORK

摘要

A novel and useful mechanism for detecting intrusion and jamming attempts by an imposter node. A time window defined as an emergency window is reserved after the end of a packet and before an acknowledgement window. Nodes that detect the presence of an intruder transmit an emergency packet during the emergency time window to inform the receiver node that the packet it received was sent from an imposter node. Attempts to jam the transmission of the emergency packet from the victim node to the receiver node are detected by listening during the emergency window time period for carrier signal that indicates that an emergency packet is trying to be sent. An emergency packet request (EPR) message is sent (referenced 182) in response so the victim node resends the emergency packet (referenced 184).