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Perceptive Admission Control for Wireless Networks

This research focuses on Perceptive Admission Control (PAC) in mobile wireless networks to manage network traffic, prioritize service quality, and prevent congestion points. The new Control Signal Range (CSR) formula and advanced protocols like Content-Aware Admission Control Protocol (CACP) are examined for enhancing network efficiency and reducing query overhead. Results show PAC's effectiveness in reducing congestion, improving throughput, minimizing packet loss and delay, making it ideal for high-QoS wireless applications.

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Perceptive Admission Control for Wireless Networks

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  1. PAC: Perceptive Admission Control for Mobile Wireless Networks Ian D. Chakeres Elizabeth M. Belding-Royer

  2. Goal • Control the amount of traffic in the network • Provide high quality service to all admitted traffic • Ensure the network congestion point is not reached

  3. Background: Impacted area

  4. Background: Receiver is also a sender • CSR>RID>RxR

  5. Background • How is RID defined? • When two packets are transmitted simultaneously, the signal power of one must be great then another by some capture factor (10) • The signal strength of any other transmission can not be greater than RXTresh/10

  6. Background • The safe distance between two senders is 2RxR+RID

  7. Perceptive Admission Control • Nodes determine the available bandwidth on their own • No query flooding is needed • Change the CSR to 2RxR+RID • Can determine accurate available bandwidth without sending query messages • A sender can detect the possible impact of creating a new traffic

  8. Determining the Available Bandwidth • MAC Layer Congestion Window • Queue Length • Number of Collision • Delay • Channel Busy Time • Transmitting • Receiving • Busy

  9. Perceptive Admission Control New CSR • A sender can consider only the traffic within this new CSR before admitting a new traffic

  10. Contention-Aware Admission Control Protocol (CACP) V.S. PAC

  11. Query flooding may fail • S2 is an isolated node, but it does affected by the new traffic brought by S1 • Solution: use high power packet transmission to send the query message

  12. Mobility • What would happen if two sender-receiver pairs move closer than the safe range ? 75% 75%

  13. Mobility • Each source monitors the available bandwidth • Senders check available bandwidth after a random time and before sending a packet • Random back-off time

  14. Simulation Result

  15. Simulation Result

  16. Simulation Result • PAC does not send query message, thus reduce the query overhead.

  17. Conclusion • PAC effectively limits the amount of data traffic to avoid congestion • Provides consistent throughput, low packet loss and delay • Useful in wireless application that requires high QoS such as multimedia applications

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