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A Contender-Aware Backoff Algorithm for CSMA Based MAC Protocol for Wireless Sensor Network

A Contender-Aware Backoff Algorithm for CSMA Based MAC Protocol for Wireless Sensor Network. Miraz Al- Mamun , Gour C. Karmakar , and Joarder Kamruzzaman Gippsland School Information Technology, Monash University, VIC 3842, Australia

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A Contender-Aware Backoff Algorithm for CSMA Based MAC Protocol for Wireless Sensor Network

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  1. A Contender-Aware Backoff Algorithm for CSMA Based MAC Protocol for Wireless Sensor Network Miraz Al-Mamun, Gour C. Karmakar, and JoarderKamruzzaman Gippsland School Information Technology, Monash University, VIC 3842, Australia E-mail: {miraz.mamun, gour.karmakar, joarder.kamruzzaman}@infotech.monash.edu.au

  2. Why MAC needs to be modified? . Multitudes of wireless nodes need to access the same access points. . Collision increases as a result. . So, contending nodes need to choose access probability following non-uniform probability distribution. . Contenders also need to estimate contender population for optimal access probability

  3. How is the access probability calculated: .Each application requires a corresponding packet transmission success probability. . Based on this, access probability at each Time Slot(TS) in the Contention Window(CW) is calculated. . Each node accesses the medium with this probability.

  4. We need to optimize CW size: . As CW dictates latency, it needs to be optimized as well . Optimization technique has been used to satisfy success probability and latency simultaneously.

  5. Algorithm for calculating the optimal CW size:

  6. Some performance figures: Response Time Comparison for Different Numbers of Reports Required (R).

  7. Some performance figures: Throughput Comparison for N=32.

  8. Thank You All mirazmamun@yahoo.com

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