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Automotive telemetry protocol

  • US 8,560,609 B2
  • Filed: 02/07/2011
  • Issued: 10/15/2013
  • Est. Priority Date: 08/26/1997
  • Status: Active Grant
First Claim
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1. A vehicular communications network for exchanging data between a plurality of both vehicle and stationary nodes, each stationary node comprising a computing unit operable to include traffic signalization, electronic tolling, and or electronic signage functions, each vehicle node comprising:

  • an on board computing unit which is operable to broadcast identity messages to, and to receive identity messages from, a plurality of neighboring vehicle nodes on at least one roadway, the received identity messages enabling each vehicle node to identify, to locate, and to list the plurality of neighboring vehicle nodes, the computing unit in said each vehicle node being operable over a high frequency channelized RF band, compliant with IEEE 802.11 Medium Access Control (MAC) protocol specification for ad-hoc networking, the identity messages being broadcast on an assigned channel common to the neighboring vehicle nodes and at intervals effective for collision avoidance, the computing unit in said each vehicle node operable for exchanging operational data with selected ones of said plurality of neighboring vehicle nodes, the operational data including event notifications representative of driving maneuvers, said each vehicle node being operable to detect transition to another vehicle neighborhood by;

    interacting with the stationary node to discover whether a different channel is currently assigned for broadcasting identity messages;

    monitoring identity messages on a plurality of channels, until said each vehicle node determines that the plurality of neighboring vehicle nodes are using a different channel to broadcast identity messages,wherein spectrum utilization is optimized by assigning channel usage to different vehicle neighborhoods according to conditions on the roadway,wherein said each vehicle node is operable to detect an exit of a departing neighboring vehicle node from the vehicle neighborhood, when a configurable amount of time expires without receiving identity messages from the departing neighboring vehicle node,wherein, in order to enable vehicle-to-vehicle notification and acknowledgment of a driving maneuver, each of said on board computing units further comprises a transmitter and receiver capable of transmitting and receiving messages under an SNMP protocol,wherein the on board computing unit is configurable for dynamic adjustment of synchronization parameters governing passive node registration, compliant with IEEE 802.11, such that an interval between successive beacon frames is lengthened and a contention free period following transmission of each beacon frame is minimized,wherein each vehicle node is operable to transmit a notification to the plural neighboring vehicle nodes, when said each vehicle node changes the assigned channel on which it broadcasts identity messages, andwherein said each vehicle node is operable to broadcast identity messages over a predetermined discovery time period that is equal to a time period required to allow said each vehicle node to recognize the plurality of neighboring vehicle nodes, wherein both a length of a discovery period and a geographic size of the vehicle neighborhood are adjustable according to an average speed of the plurality of neighboring vehicles nodes in the vehicle neighborhood.

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