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Priority-Based Backoff Counter Selection

Priority-Based Backoff Counter Selection. Date: 2012-3-15. Authors:. Introduction. 802.11ah use cases target low rate, long range applications Use cases accepted in [1] include meters, sensor applications, factory automation,…

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Priority-Based Backoff Counter Selection

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  1. Priority-Based Backoff Counter Selection Date: 2012-3-15 Authors:

  2. Introduction • 802.11ah use cases target low rate, long range applications • Use cases accepted in [1] include meters, sensor applications, factory automation,… • There are various priority types of STAs in the 802.11ah use cases • QoS level, emergency level, etc.

  3. Proposed Scheme • Proposed priority-based backoff counter selection • Utilize different distributions for backoff counter selection based on non-uniform distribution (e.g., linear distribution, exponential distribution) • Conventional 802.11 MAC uses uniform distribution for backoff counter selection • According to emergency levels or QoS levels, the probability function of backoffcounter can be changed

  4. Proposed Scheme • Backoff counter selection using linear distribution Probability density function Notations r: Emergency level x: Selected CW size Expected CW size Probability distribution Expected CW size Possible value of CW Emergency level

  5. Proposed Scheme • Backoff counter selection using exponential distribution Probability density function Notations r: Emergency level x: Selected CW size Expected CW size Probability distribution Expected CW size Possible value of CW Emergency level

  6. Conclusions • STAs select backoff counter based on linear or exponential distribution according to their emergency level. • High-priority STAs obtain medium more easily. • Further investigate the improvement of the proposed scheme in various simulation environments.

  7. References [1] 11-11/0457r0, Potential Compromise for 802.11ah Use Case Document

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