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PAC: Perceptive Admission Control for Mobile Wireless Networks

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

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PAC: Perceptive Admission Control for Mobile 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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