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Vehicular Networks


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Vehicular Networks

  2. 2. • Motivation• Introduction• Proposed Scenarios• Data dissemination approaches and tradeoffs• Challenges• ConclusionSeminar, VIPES 2012 2
  3. 3. Imagine traveling on a highway with traffic jam miles ahead…Seminar, VIPES 2012 3
  4. 4. • Imagine driving to a new city and you want to find the bestparking lotMillions wastage on gasolineHours of waiting time• No real-time information provided• e.g. current occupancyUse a Parking Map!Seminar, VIPES 2012 4
  5. 5. • Desirable system properties• Data collection and distribution in a local environment• Low information delivery latency• Cheap deployment and communication• Probable solutions• Cellular ? Service fees• Satellite ? High latency• Vehicular Networks ?• What is a vehicular network?• Vehicles are equipped with sensing, computing and wireless devices• Vehicles talk to road-side infrastructure (V2I) and other vehicles (V2V)• Has all the desirable propertiesSeminar, VIPES 2012 5
  6. 6. • Vehicular network is a subset of MANET (Mobile Ad-hocNetwork) where mobile nodes are wireless technologyequipped vehicles.Seminar, VIPES 2012 6
  7. 7. Forward radarComputing platformEvent data recorder (EDR)Positioning systemRear radarCommunicationfacilityDisplay(GPS)Human-Machine InterfaceA modern vehicle is a network of sensors/actuators on wheels !Seminar, VIPES 2012 7
  8. 8. ContentDownloadingP2PAdvertisingSensing theenvironmentSeminar, VIPES 2012 8
  9. 9. • Involves peer-to-peer content distribution• Files are shared using Bit-Torrent style.• Hence the name CAR-Torrent is used.• Parallel Downloading scheme is used.Seminar, VIPES 2012 9
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  12. 12. P2P location significantadvertising Access Points are not always available. Multihop downloading is having practicallimitations. Thus, Randomly selected “ad Segments” are used. The segments are epidemically disseminated.Seminar, VIPES 2012 12
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  14. 14. VAN can act as important sensor platform.Vehicles can generate much larger volume of datacompared to traditional sensor system.This scheme is called “Mob-Eyes”.The data can be harvested for key problems offorensic studies.Seminar, VIPES 2012 14
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  16. 16. Vehicular networks need to handle largeamounts of data (emergency messages,videos etc)How do we efficiently disseminate thisinformation?• Characteristics• High mobility• Dynamic topology• Receivers are a priori unknown• Large scale• High density• Low penetration ratio• Challenges• Maintaining routingtables is difficult• Scalability• Dealing with partitionsSeminar, VIPES 2012 16
  17. 17. • V2I / I2V dissemination• Push based• Pull based• V2V dissemination• Flooding• RelayingSeminar, VIPES 2012 17
  18. 18. • Infostation pushes out the data to everyone• Applications: Traffic alerts, Weather alerts• Why is this useful?• Good for popular data• No cross traffic  Low contention• Drawback• Everyone might not be interested in the same dataSeminar, VIPES 2012 18
  19. 19. • Request – Response model• Applications: Email, Webpage requests• Why is this useful?• For unpopular / user-specific data• Drawback• Lots of cross traffic  Contention, Interference, CollisionsSeminar, VIPES 2012 19
  20. 20. • Basic Idea• Broadcast generated and received data to neighbors• Usually everyone participates in dissemination• Advantages• “Good” for delay sensitive applications• Suitable for sparse networks• Key Challenges• How to avoid broadcast storm problem?Seminar, VIPES 2012 20
  21. 21. • Basic Idea• Instead of flooding the network, select a relay (next hop)• Relay node forwards the data to next hop and so on• Advantages• Reduced contention  Scalable for dense networks• Key Challenges• How to select the relay neighbors?• How to ensure reliability?Seminar, VIPES 2012 21
  22. 22. • Not much literature on V2I / I2V communication• How to deal with cross-traffic in the pull scheme• Scheduling transmissions?• How to combine push and pull ? What is hybrid ?• Mobility traces for evaluation of dissemination• Real traces are expensive to collect• Not enough data points for simulation• Need to extrapolateSeminar, VIPES 2012 22
  23. 23. Vehicular network promises a huge advancement inthe field of mobile network.For researchers it opens door of very nice domain.As big organizations are funding these researchesprogress will be pretty fast.Seminar, VIPES 2012 23
  24. 24. References[1] Mario Gerla , Leonard Kleinrock, Vehicular networks and the future of themobile internet, Elsevier, Computer Networks 55 (2011) 457–469.[2] M. Motani, V. Srinivasan, P. Nuggehalli, PeopleNet: Engineering awireless virtual social network, in: ACM MobiCom’05, Cologne,Germany, August–September 2005[3] M. Conti, E. Gregori, G. Turi, A cross-layer optimization of gnutella formobile ad hoc networks, in: ACM MobiHoc, Urbana-Champaign, IL,USA, 2005.[4]A. Capone, M. Cesana, S. Napoli, A. Pollastro, MobiMESH: a completesolution for wireless mesh networking, in: IEEE MASS’07, Pisa, Italy,October 2007[5]Pei-Chun Cheng, Jui-Ting Weng, Lung-Chih Tung, Kevin C. Lee, MarioGerla, Jerome Haerri, GeoDTN+Nav: a hybrid geographic and DTNrouting with navigation assistance in urban vehicular networks, in:MobiQuitous/ISVCS 2008, Trinity College Dublin, Ireland, July 2008.Seminar, VIPES 2012 24
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