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MAC Protocols The Influence of Communication Patterns on the MAC Protocol Design
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CSMA Protocol Send when no-one else is sending Wait until air is clear
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Hidden Node Problem Nodes A and C can’t hear each other Collision happens at the receiver Carrier detection happens at the sender A B C
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Collision Avoidance (MACA) AB C Ready to send AB C Clear to send AB C Data
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Simulation Results goodput msg/node/s Network protocol performance msglen=50 0 1 2 3 4 5 6 7 8 9 10 11 0 10 20 30 40 50 60 70 80 90 100 input msg/node/s CSMA MACA
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Research Charter Look at MAC protocol performance from a communication pattern point of view
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Sink Routing Sink routing gives directionality Directionality lessens effect of hidden node problem
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Directionality Experiment Grid network Experiment 1: random communication Experiment 2: directed communication All other parameters are equal
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Simulation Results 0 50 100 150 200 250 300 350 400 0 100 200 300 400 500 600 700 800 900 1000 goodput msg/s input msg/s Direction experiment CSMA directed MACA directed CSMA random MACA random
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Conclusions Communication patterns do have an influence on the choice and design of the MAC layer protocol If we design a MAC protocol for WSNs, we should take communication patterns into account
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Next Steps Implement communication patterns in simulator Implement energy model and more realistic radio propagation model Test and optimize MAC protocols based on energy usage Implement protocol on EYES node
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