Presentation on theme: "Arunkumar Anand No 2, S7 ECE"— Presentation transcript:
1Arunkumar Anand No 2, S7 ECE Vehicle-to-Vehicle Wireless Communication Protocol for Collision WarningArunkumar AnandNo 2, S7 ECESeminar Presentation 2006Dept. of Electronics & Communiactions.Govt. Engg. College, Wayanad.28th September 2006
2Contents Motivation Application Levels Overview of Vehicular CommunicationsNeeds and AssumptionsProtocol for Vehicular Comm.Application ChallengesState TransitionFuture WorksConclusionReferences
3Accidents have been taking thousands of lives each year MotivationAccidents have been taking thousands of lives each yearStudy shows - “About 60% roadway collisions could be avoided if the operator of the vehicle was provided warning at least one-half second prior to a collision”(- US. Patent No. 5,613,039)Constraints of human drivers’ perceptionLine-of-sight limitation of brake lightLarge processing/forwarding delay for emergency events.
41. Line of Sight Limitation Constraints of human drivers’ perception1. Line of Sight LimitationOn foggy daysWhat’s in front of that bus ?What’s behind the bend ?On rainy daysFig.1
5Constraints of human drivers’ perception 2. Large forwarding delay for emergency events.Three Cars, namelyReaction time ranges from 0.7sec to 1.5secCar ACar BCar CAnimation. 1
6Scope of this Paper Overview of Different Vehicular Communications Data BaseScope of this PaperCommunicationHot Spots (DSRC)Petrol Pump, Workshop etc..Satellite toTraffic Management Center(TMC)Vehicle(GPS)• Key Players– USDOT, AASHTO, auto companies• Working Group In Place– High level requirements defined– Defining data and communication requirements• Initiating DSRC Test Program( V2V )-Vehicle-Vehicleto-to-RoadsideVehicle(DSRC)( DSRC)( V2R )Fig.2
7Application LevelsTraffic Safety can be improved if drivers have the ability to see further down the road.If traffic information was provided to Drivers, Police and other Authorities; roads would be safe and traveling on them would be more efficientVehicle-to-Vehicle(V2V) and Vehicle-to-Roadside(V2R) Communication can bring out the following achievements.Presence of obstacles on road.Emergency Braking of a preceding vehicle.Information about Blind Crossing, School proximity, Railway crossing etc…Entries to Highways.High Speed Internet Access.Electronic Toll Collection.Parking Space locater in Cities.Nearest Petrol Pump, Workshop etc..
8for a vehicle participating in V2V communication Needs and Assumptionsfor a vehicle participating in V2V communicationInterested on Direction, Speed, Position etc…Is able to obtain its own geographical location and determine the relative positions on the road.(Digital Maps, GPS)Is equipped with at least one wireless transceiver
9Protocol for Vehicular Comm. Unreliable wireless linkCongested channelVersatile topology due to high mobility of vehiclesLow LatencyDynamically form wireless loopsChallenges and RequirementsTechnology for ITS especially for v2v and v2r communicationService rules for DSRC are developed by the ASTMDSRC is based on IEEE a technology10mMin. Separation1000mMax Range1-54MbpsData Rate7 channelsChannelsQPSK OFDMModulation75MHz (5.850 – 5.925GHz)BandwidthDSRC (Dedicated Short Range Communication)
10Analyze a practical situation Animation. 2Analyze a practical situationpositionspeedintent…DSRC for cooperative vehicle information
11DSRC for cooperative vehicle information Animation. 2Who affects the most ?Not For me!positionspeedintent…DSRC for cooperative vehicle informationFor me!
12Terms Abnormal Vehicle (AV) Emergency Warning Messages (EWM) A vehicle acts abnormally, e.g. deceleration exceeding a certain threshold, dramatic change of moving direction, major mechanical failure, etc.Emergency Warning Messages (EWM)Messages generated by an AV to warn other surrounding vehicles, which include the geographical location, speed, acceleration and moving direction of the AV.
13Application Challenges <1> Requiring to support multiple co-existing AVs over a longer period of timeCo-existing AVs: AVs whose existences overlap in time and whose transmissions may interfere with each otherAn AV can exist for an extended period of timeChain effects of emergency road situationFig.3
14Application Challenges <2> Differentiation of emergency events and elimination of redundant EWMsUnnecessary EWMs should be avoided so that the channel bandwidth can be better utilized for useful EWMsFig.4
15State transitions of AVs Eliminate redundant EWMsState transitions of AVsEach AV may be in one of three states:Initial AV: When an emergency event occurs to a vehicle, the vehicle becomes an AV and enters the initial AV state, transmitting EWMs following the rate decreasing algorithm.Non-flagger AV: nonparticipating in sending EWMs to the group on some conditions to eliminate redundant EWMsFlagger AV: resuming EWM transmissions at the minimum required rate.
16State transitions of AVs (condition.) Transitions from Initial AV state to Non-flagger AV state:At least Talert duration has elapsed since the time when the vehicle became an initial AV.EWMs from one of the “followers” of the initial AV are being overheard;Transitions from Non-flagger AV to flagger AVsets a timer for a Flagger Timeout ( FT) duration. If it does not receive any EWMs from its followers when the FT timer expires, the non-flagger AV changes its state to flagger AV.Transitions from flagger AV to Non-flagger AVIf a flagger AV receives EWMs from one of its followers, it will relinquish its flagger responsibility, becoming a non-flagger AV.
17Examples of state transitions Fig. 5aFig. 5bFig. 5c
19Future Works USDOT Intelligent Transportation Systems (ITS) Program Vehicle manufacturers would install the technology in all new vehicles,beginning at a particular model yearFull-scale deployment in both the vehicles and the roadside infrastructure will be made by 2008/9Car2Car Communication Consortium ( )Non-profit organization initiated by European vehicle manufacturers.To create and establish an open European industry standard forCar2Car communication systems based on wireless LAN components and to guarantee European-wide inter-vehicle operability
20Conclusion An Overview of Vehicular Comm. is given. Protocol of Vehicular Comm. Is discussed.Protocol Challenges are also analysed.HiBuddyA new era is arriving where vehicles will communicate with each other, the devices within them, and also with the world; making the next generation of vehicles into communication hubs.
21References S. Biswas, "Vehicle-to-Vehicle Wireless Communication Protocols for Enhancing Highway Traffic Safety," Communications Magazine, IEEE Publication Date: Jan Volume: 44, Issue: 1 page(s):74- 82 X. Yang et al., " A Vehicle-to-Vehicle Communication Protocol for Cooperative Collision Warning,"Proc. 1st Annual Int’l. Conf. Mobile and Ubiquitous Syst: Networking and Services, 2004 G.S Bickel, "Inter/Intra-Vehicle Wireless Communication" at Q. Xu, R. Sengupta, and D. Jiang, "Design and Analysis of Highway Safety Communication Protocol in 5.9 GHz Dedicated Short-Range Communication Spectrum," Proc. IEEE VTC, vol. 57, no. 4, 2003, pp. 2451–55 C.Bettstetter "Toward Internet-Based Car Communications: On Some System Architecture And Protocol Aspects" TUM, Germany J. Zhu and S. Roy, "MAC for Dedicated Short Range Communications in Intelligent Transport Systems,"IEEE Commun. Mag., vol. 41, no. 12, 2003