1. A Bluetooth-based high-performance LAN access point incorporating multiple radio units Jesung Kim Junam Kim Yujin Lim Jihyuk Yoon Sang Lyul Min Joong Soo Ma presented by Metin Tekkalmaz

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

3. 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. 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. 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. 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. 7 Simulation Model

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

9. 9 Simulation Results for Various Unpark Intervals

10. 10 Delay Analysis

11. 11 Simulation with 32 users

12. 12 Simulation with 64 users

13. 13 Simulation with 128 users

14. 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