VANET Simulation of AP Assistance
AP協助下的車用無線網路模擬
B97901015 陳俊安
B97901087 林蓉瑄
B97901098 周伯威
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Introduction
• VANET module: MOVE
– MObility model generator for VEhicular networks
• AODV+
– use AODV for simulations of wired-cum-wireless scenarios
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Motive
• Improve VANET performance
– Using APs in the city
– Fast & reliable Ethernet
• But “where are you?”
– If we don’t use Mobile IP…
• Implement AODV+ on both wired and
wireless nodes
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Experiment Design
• Car numbers
– 9, 26, 32, 44, 55, 65
• AP numbers
– 0, 4, 9(3x3), 16, 25, …, 100
• Random traffic
– Using MOVE
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Modification
• AODV+ does not work
– wired <--> wireless
– wireless -> wired -> wireless ?
• Alternative
– motionless cars act as APs
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Performance
• Success ratio
• Pong RTT
– Average
– Standard deviation
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• In XGraph
Success ratio
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• In XGraph
Average
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• In XGraph
Standard Deviation
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Graph analysis
Cars # 9 26 32 44 55 65
Best AP # 9 16 16 9 9 9
Start to drop 81 36 49 36 36 36
Best AP#/Car# 1.00 0.62 0.50 0.20 0.16 0.14
Success ratio 83.26 94.78 90.68 92.68 92.93 96.18
Best
=
highest
success
ra.o
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Conclusion
• Too much water drowned the miller
– When mobility and density is low, AP counts
• Trade-off
– High transmission rate
– Extra routing table overhead