1 / 11

MAC Protocols

MAC Protocols. The Influence of Communication Patterns on the MAC Protocol Design. CSMA Protocol. Send when no-one else is sending Wait until air is clear. C. A. B. Hidden Node Problem. Nodes A and C can’t hear each other Collision happens at the receiver

john
Download Presentation

MAC Protocols

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MAC Protocols The Influence of Communication Patterns on the MAC Protocol Design

  2. CSMA Protocol • Send when no-one else is sending • Wait until air is clear

  3. C A B Hidden Node Problem • Nodes A and C can’t hear each other • Collision happens at the receiver • Carrier detection happens at the sender

  4. Ready to send C A B Clear to send C A B Data C A B Collision Avoidance (MACA)

  5. Simulation Results Network protocol performance msglen=50 11 CSMA MACA 10 9 8 7 6 goodput msg/node/s 5 4 3 2 1 0 0 10 20 30 40 50 60 70 80 90 100 input msg/node/s

  6. Research Charter Look at MAC protocol performance from a communication pattern point of view

  7. Sink Routing • Sink routing gives directionality • Directionality lessens effect of hidden node problem

  8. Directionality Experiment • Grid network • Experiment 1: random communication • Experiment 2: directed communication • All other parameters are equal

  9. Simulation Results Direction experiment 400 350 300 MACA directed 250 CSMA directed MACA random 200 CSMA random goodput msg/s 150 100 50 0 0 100 200 300 400 500 600 700 800 900 1000 input msg/s

  10. 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

  11. 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

More Related