User-Centric Management of Wireless LANs

1. User-Centric Management of Wireless LANs { • Group 9

2. Outline User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian Summary User–centric vs. AP-centric network management framework Theoretical analysis & simulation FCAPS relationships Conclusion References

3. Summary Fig. 1. Illustration of different sensing ranges of users and APs User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian • ↑ Deployment density of WLANs  ↑ # of APs deployed around user • Challenge of high-density WLANs: Effective management of APs  Optimize users’ throughput • Throughput depends on: -Load of AP -Channel conditions to AP -Load of other devices within its sensing range • Challenge of effective network management: -AP association  balancing load of each AP -Channel selection  balancing load in each channel  throughput ↑

4. Traditional NM in WLANs User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian • Basic Management Entities SME MLME PLME • Related Management Activities Fig. 2. Network management flow in traditional WLANs.

5. AP-centric V.S. User-centric NM framework User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian • AP-centric NM framework （Traditional） - Exclusively AP one-side control the transmission & None that relate to users - NM procedures: simple + workable - Helpless to enhance the throughput - Not suitable  Differentiated access priorities Support different QoS • User-centric NM framework (Proposed) -The WLAN management is sharing pipeline btw users & APs - Maximize users’ throughput - Optimize AP aggregate throughput and dynamic APs’ channel selection -Network conditions & access priority  considered by two NM activities -User actively senses the network condition & delivers the sensed results with its access priority to the AP candidates

6. How User-centric NM framework Works? User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian

7. Simulations • Software used: Network Simulator version 2 (NS2) • Simulation Parameters • Simulation environment Indoor environment User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian

8. Effect of Access Priority User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian Throughput ↓as # of users ↑. Throughput of the user with high access priority is greater than that with low access priority.

9. Throughput Comparison User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian AP-associated based on the user-centric NM framework always outperforms other frameworks 25%-90% throughput gain

10. Throughput Comparison – Channel Selection User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian User-centric management provides highest throughput – max 69.3% As the APs get saturated with load, the throughput becomes similar for all the system.

11. Impact of Dual-Threshold on Throughput User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian C : {0,1} = mapping factor for the lower bound CR > 1 = constant for leveraging improvement degree As the lower bound increases throughput decreases As the improvement degree increases throughput increases But, if both lower bound and improvement degree increases throughput decreases

12. User- centric under FCAPS NM User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian • Fault management------detect & correct associations e.g. AP association triggered by user • Configuration management------sharing pipeline info  beacon frame by AP periodically  snapshot by user • Accounting management • Performance management—measure & record  AP calculates the potential throughput to user  user records collected info by snapshot  Increased NM traffic • Security management • Security Vulnerability – can be prone to attack via fake user snapshots.

13. Conclusion User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian Traditional WLAN management system × can’t optimize users’ throughput ∵ ineffectively utilize the network conditions The user-centric network management framework  takes maximizing the throughput of users as the fundamental principle  provides an effective infor. sharing pipeline btw users & APs  assist the key network management activities Theoretical analysis user-centric NM framework provide complete information attaining the optimization of NM activities The simulation results throughputs can be significantly ↑ in NM activities over user-centric framework

14. Questions? User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian

15. References User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian [1] Y. Zhu, Q. Ma, C. Bisdikian, C. Ying, “A user-centric network management framework for high-density wireless LANs," in Proc. 2009 IFIP/IEEE International Symp. Integrated Netw. Management, pp. 218-225, 2008. [2] V. A. Siris and D. Evaggelatou, “Access point selection for improving throughput fairness in wireless LANs," in Proc. 10th IFIP/IEEE Int. Symp. Integrated Netw. Management, 2007, pp. 469-477. [3] Y. Zhu, Z. Niu, Q. Zhang, B. Tan, Z. Zhou, and J. Zhu, “A multi-AP architecture for high-density WLANs: protocol design and experimental evaluation," in Proc. IEEE SECON, 2008, pp [4] Y. Fukuda, T. Abe, and Y. Oie, “Decentralized access point selection architecture for wireless LANs," in Proc. 3rd Wireless Telecommun. Symp., 2004, pp. 137-145.28-36. [5] S. Vasudevan, K. Papagiannaki, C. Diot, J. Kurose, and D. Towsley, “Facilitating access point selection in IEEE 802.11 wireless networks,“ in Proc. 5th ACM SIGCOMM Conf. Internet Measurement, 2005, pp. 293-298. [6] J. Geier (2002, Feb. 11), “Assigning 802.11b access point channels," Wi- Fi Planet. Available: http://www.wi-fiplanet.com/tutorials/article.php 972261. [7] Y. Hua, Y. Zhu, and Z. Niu, “A channel assignment scheme in high density WLANs to mitigate pesudo capture effect," in Proc. IEEE GLOBECOM, 2007, pp. 4796-4800.