V2V SAFETY SYSTEM USING VEHICLE LOCATION AS VEHICLE IDENTIFICATION

摘要

A vehicle-to-vehicle (V2V) communication transponder for use in V2V communication, safety and anti-collision systems using only a vehicle location for vehicle ID is described. Message embodiments are free of pre-assigned permanent vehicle identification. A hybrid TMDA and CSMA protocol is used. Vehicle position is broadcast as an offset in distance units from a pre-defined geographical grid in degree units. A transponder may proxy for non-equipped vehicle. A proxy handoff and message coding for a proxy message are described. Embodiments are free of MAC and IP addresses. No central authority or road-side equipment (RSU) is required. Embodiments include equipped vehicles and V2V system using the transponder. Embodiments include equipped vehicles and V2V system using the transponder.

主权项

1. A vehicle-to-vehicle (V2V) communication transponder adapted to operated in a first vehicle 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 n time slots of predetermined duration, enumerated and contiguous; wherein the frame is subdivided into a priority class region comprising contiguous time slots from a first time slot Si 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.