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A Bluetooth-based high-performance LAN access point incorporating multiple radio units

This paper by Jesung Kim, Junam Kim, Yujin Lim, Jihyuk Yoon, Sang Lyul Min, Joong Soo Ma, presented by Metin Tekkalmaz, outlines the aim, design issues, proposed solution, evaluation environment, performance results, and conclusions of a new Bluetooth-based LAN access point. The aim is to increase the number of devices served simultaneously with reasonable quality by utilizing multiple radio units. The proposed design includes using multiple units, operating in Inquiry Scan mode, and directing connections to the least loaded unit. Performance evaluations using an event-driven simulator and traffic generator show promising results, with capacity reaching 128 users at 300 Kbps per user with four radio units. The design is simple yet effective, supported by neat and explanatory evaluations.

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A Bluetooth-based high-performance LAN access point incorporating multiple radio units

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  1. A Bluetooth-basedhigh-performance LANaccess point incorporatingmultiple radio units Jesung Kim Junam Kim Yujin Lim Jihyuk Yoon Sang Lyul Min Joong Soo Ma presented by Metin Tekkalmaz

  2. Outline • Aim • Issues in the Design • Design Proposed • Environment for Evalution • Result of Performance Evaluations • Conclusion

  3. Aim of the Design • Aim is to increase the number of devices that an Access Point can serve simultaneously with a reasonable quality

  4. Issues in the Design • A Bluetooth device serves up to 7 devices simulatenously • Use of multiple radio units is a solution • Interference becomes a problem • To which unit a newcomer will connect?

  5. Design Proposed • Multiple radio units will be used • The Access Point will be in Inquiry Scan mode instead of Inquiry mode • One of the units will be used for initial connection establishment • New connections will be directed to the unit with least number of devices attached

  6. Environment for Performance Evaluation • Event-Driven Simulator • Traffic generator is adapted from Ns • Messages are fed to the L2CAP layer • Two-Phase Round Robin is used as scheduling policy • Parking/Unparking policies • Least recently active slave • One parked for the longest time

  7. Simulation Model

  8. Performance Evaluations • Concepts: • Effective throughput • Upload unpark delay • Download unpark delay

  9. Simulation Results for Various Unpark Intervals

  10. Delay Analysis

  11. Simulation with 32 users

  12. Simulation with 64 users

  13. Simulation with 128 users

  14. Conclusions • Until 4 radio units performance increases rapidly • With 4 radio units 128 users are served with 300 Kbps per user • Simple but nice-working design • Evaluations are neat and explanatory

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