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V2V safety system using vehicle location as vehicle identification

  • US 9,449,515 B2
  • Filed: 04/24/2013
  • Issued: 09/20/2016
  • Est. Priority Date: 04/24/2012
  • Status: Active Grant
First Claim
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1. A vehicle-to-vehicle (V2V) communication transponder adapted to operate in a first vehicle equipped with the V2V transponder wherein the transponder is adapted to accept as input a subject vehicle position and a subject vehicle heading, and wherein the transponder is adapted to broadcast a series of V2V safety messages wherein each V2V safety message comprises:

  • (i) the subject vehicle position;

    (ii) the subject vehicle heading; and

    (iii) a subject vehicle speed;

    wherein the improvement is;

    the transponder uses a basic time interval (“

    frame”

    ) of predetermined duration wherein the frame repeats continuously;

    wherein the frame comprises integer n time slots of predetermined duration, enumerated and contiguous;

    wherein a length of the frame and the integer n have been previously agreed with other transponders;

    wherein the frame is subdivided into a priority class region comprising contiguous time slots from a first time slot S1 to a last time slot S2; and

    a non-priority class region comprising contiguous time slots from a first time slot S3 to a last time slot S4;

    wherein the range S1 to S2 and the range S3 to S4 do not overlap;

    wherein the transponder transmits only time-critical V2V safety messages in the priority class region;

    wherein the transponder broadcasts a V2V safety message in one self-selected time slot in the priority class region in every frame;

    wherein the V2V safety messages are broadcast in cleartext; and

    wherein the only vehicle identification in at least some V2V safety messages is the subject vehicle position.

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