AODV and GPSR in a realistic VANET context. Jonathan Ledy, Benoît Hilt, Hervé Boeglen, Anne-Marie Poussard, Frédéric Drouhin, Rodolphe Vauzelle

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1 1 AODV and GPSR in a realistic VANET context Jonathan Ledy, Benoît Hilt, Hervé Boeglen, Anne-Marie Poussard, Frédéric Drouhin, Rodolphe Vauzelle

2 2 Summary The VANETs context AODV & GPSR Performance comparison HELLO messages adaptation Conclusions and future work

3 3 The VANETs context VANETs (Vehicular Ad hoc NETworks) Self-configurable, adaptive, highly dynamic. Nodes Vehicles. Vehicles to Vehicles (V2V) Vehicles to Infrastructure (V2I)

4 4 The VANETs context VANETs (Vehicular Ad hoc NETworks) Self-configurable, adaptive, highly dynamic. Nodes Vehicles. Vehicles to Vehicles (V2V) Vehicles to Infrastructure (V2I)

5 5 The VANETs context Experimentation or simulation? Experimentation Cost Realism Repeatability Simulation Cost Realism Repeatability

6 6 The VANETs context Experimentation or simulation? Experimentation Cost Realism Repeatability Simulation Cost Realism Repeatability Realistic simulation platform (Mobility + Physical layer)

7 7 The VANETs context Experimentation or simulation? Experimentation Cost Realism Repeatability Simulation Cost Realism Repeatability Realistic simulation platform (Mobility + Physical layer)

8 8 The VANETs context Experimentation or simulation? Experimentation Cost Realism Repeatability Simulation Cost Realism Repeatability Realistic simulation platform (Mobility + Physical layer)

9 The VANETs Context Realistic simulation platform Realistic simulation platform Realistic Physical Layer integrated into network simulator NS-2. Realistic Mobility Model VanetMobiSim used jointly. The VANET simulation platform : Realistic mobility (Vanet Mobisim) Realistic physical layer (UM-CRT [1] + 802,11p) NS-2 simulator [1] J. Ledy, Stratégie d'adaptation de liens sur canaux radios dynamiques pour les communications entre véhicules - Optimisation de la Qualité de Service, Thèse de doctorat, Université de Poitiers, France,

10 The VANETs Context Realistic simulation platform 10 Simulation parameters Realistic simulation platform Network simulator NS 2.34 Propagation model FreeSpace, UM-CRT Physical layer p Mobility simulator VanetMobiSim Mobility simulations 30 Simulation environment Munich city center Simulation time 60 seconds Flow rate 6 MBits/s frequency 5,9 GHz Routing protocols AODV, GPSR UDP simultaneous flow 10 Paquets size 64 / 128 / 256 / 512 / 1024 bytes

11 11 Summary The VANETs context AODV & GPSR Performance comparison HELLO messages adaptation Conclusions and future work

12 12 AODV & GPSR Ad Hoc routing protocols Topological routing protocols Geographical routing protocols Pro-active Reactive Hybrid Ad Hoc routing protocols classification.

13 13 AODV & GPSR Ad Hoc routing protocols Topological routing protocols Geographical routing protocols Pro-active Reactive Hybrid GPSR AODV Ad Hoc routing protocols classification. A topological routing protocol : Reactive protocol : Ad hoc On demand Distance Vector (AODV) A geographical routing protocol : Geocast protocol : Greedy Perimeter Stateless Routing (GPSR)

14 AODV Ad hoc On demand Distance Vector (AODV) / RREP mechanism AODV Emitter : 1 Receiver : 5 14

15 AODV Ad hoc On demand Distance Vector (AODV) / RREP mechanism AODV Emitter : 1 Receiver : 5 15

16 AODV Ad hoc On demand Distance Vector (AODV) / RREP mechanism AODV RREP 5 Emitter : 1 Receiver : 5 16

17 AODV Ad hoc On demand Distance Vector (AODV) / RREP mechanism AODV RREP 4 RREP 5 Emitter : 1 Receiver : 5 17

18 AODV GPSR GPSR Greedy Perimeter Stateless Routing (GPSR) Greedy Forwarding Perimeter Forwarding Emitter : 1 Receiver : 5 18

19 AODV GPSR GPSR Greedy Perimeter Stateless Routing (GPSR) Greedy Forwarding Perimeter Forwarding Emitter : 1 Receiver : 6 19

20 20 Summary The VANETs context AODV & GPSR Performance comparison HELLO messages adaptation Conclusions and futur works

21 Performance comparison Packet Delivery Ratio 21 AODV vs GPSR 100 Packet Delivery Ratio 90 Packet Delivery Ratio (%) Ideal propagation situation (FreeSpace) GPSR overcomes AODV (Improvement = 5 %) 10 0 AODV FreeSpace GPSR FreeSpace AODV Realistic GPSR Realistic Packet delivery ratio for AODV and GPSR in ideal propagation situation

22 Performance comparison Packet Delivery Ratio 22 AODV vs GPSR Packet Delivery Ratio (%) Packet Delivery Ratio Realistic propagation situation (UM-CRT p) AODV overcomes GPSR (Improvement = 15 %) 10 0 AODV FreeSpace GPSR FreeSpace AODV Realistic GPSR Realistic Impact of the propagation model realism on the Packet Delivery Ratio for AODV and GPSR

23 Performance comparison Packet Delivery Ratio AODV Realistic AODV vs GPSR GPSR Realistic Packet Delivery Ratio (%) Simulation number Packet Delivery Ratio for AODV and GPSR in realistic situation

24 Performance comparison Packet Delivery Ratio Delay Routing Overhead AODV vs GPSR Routing Overhead Routing Overhead AODV FreeSpace GPSR FreeSpace AODV Realistic GPSR Realistic Routing Overhead for AODV and GPSR in ideal and realistic propagation situation Link breakage -> more Request/Reply messages whereas Hello & Query messages rate stay constant. 25

25 Performance comparison Packet Delivery Ratio Delay AODV vs GPSR 0,8 Transmission Time 0,7 0,6 0,5 Delay (s) 0,4 0,3 0,2 0,1 0 AODV FreeSpace GPSR FreeSpace AODV Realistic GPSR Realistic Delay for AODV and GPSR in ideal and realistic propagation situation The route request/reply delay is included into the end to end delay 27

26 Performance comparison 28 AODV vs GPSR Does GPSR overcome AODV? Does AODV overcome GPSR?

27 Performance comparison 29 AODV vs GPSR Does GPSR overcome AODV? Does AODV overcome GPSR? Packet Delivery Ratio : AODV Delay & Routing Overhead : GPSR

28 30 Summary The VANETs context AODV & GPSR Performance comparison HELLO messages adaptation Conclusions and futur works

29 31 Performance comparison HELLO messages adaptation HELLO messages adaptation HELLO messages adaptation in AODV Does not improve VANET performances in realistic situation [1] HELLO messages adaptation in GPSR?

30 32 Performance comparison HELLO messages adaptation HELLO messages adaptation 22,8 22,6 Packet Delivery Ratio (%) 22,4 22, ,8 21,6 21,4 HI 0,1s HI 0,5s HI 1s HI 3s HI 5s Hello Interval GPSR packet delivery ratio for different Hello Intervals

31 33 Performance comparison HELLO messages adaptation HELLO messages adaptation Routing Overhead HI 0,1s HI 0,5s HI 1s HI 3s HI 5s Hello Intervals GPSR packet delivery ratio for different Hello Intervals

32 34 Performance comparison HELLO messages adaptation HELLO messages adaptation HELLO messages adaptation in GPSR Improves Packet delivery ratio : + 0,5 % Increases routing overhead : + 85 % Is it worth it?

33 35 Summary The VANETs context AODV & GPSR Performance comparison HELLO messages adaptation Conclusions and futur works

34 36 Performance comparison HELLO messages adaptation Conclusions Conclusions AODV vs GPSR : Packet delivery ratio smaller than 40 % AODV > GPSR in term of packet delivery ratio GPSR > AODV in term of delay GPSR > AODV in term of routing overhead None of these protocols can be chosen over the other for VANETs. AODV and GPSR Hello interval adaptation : Does not improve significantly the protocol results

35 37 Performance comparison HELLO messages adaptation Conclusions Future works Future works New routing algorithm : Routing protocols dedicated to VANETs Routing protocols able to deal with link breakage New metrics : Cross layer metrics

36 38 AODV and GPSR in a realistic VANET context Thank you for your attention.

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