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User-Centric Management of Wireless LANs
Group 9
• ZhengDe Li3344514
• XinTong Zhang3379583
• DanPing Tong3401729
• Nashid Farhad3423251
• LiKai Feng3427408
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Summary User–centric vs. AP-centric network
management framework Theoretical analysis & simulation FCAPS relationships Conclusion References
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
Outline
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↑ Deployment density of WLANs ↑ # of APs deployed around userChallenge of high-density WLANs: Effective management of APs Optimize users’ throughputThroughput depends on: -Load of AP -Channel conditions to AP -Load of other devices within its sensing rangeChallenge of effective network management: -AP association balancing load of each AP -Channel selection balancing load in each channel throughput
↑
Summary
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
Fig. 1. Illustration of different sensing ranges of users and APs
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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
Parameter Configuration
Channel Selection
Power Configurati
on
User Information
Management
AP Association
Priority Manageme
nt
Network Monitoring
Downlink Monitoring
Uplink Monitoring
Fig. 2. Network management flow in traditional WLANs.
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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 QoSUser-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
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
AP-centric V.S. User-centric
NM framework
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• AP periodically delivers config info to neighboring users
• Configuration Info: channel, data rate, MAC etc.AP Sends Beacon
• User actively collects network data (user’s network snapshot)
• Sends to all candidate APs in its receiving range
User Sends Channel Condition to AP
• AP calculates potential throughput and return to user
• Association Response Frame
AP computes potential throughput
• User selects and sends a new request to the AP with the max potential throughput &AP reply and store user’s info
• A new association established
User joins the AP with the most potential throughput
• AP Periodically updates snapshots and performance of associated users
• A new association triggered
AP optimizes channel selection according to
user data
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
How User-centric NM framework Works?
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Simulations
Software used: Network Simulator version 2 (NS2)
Simulation Parameters
Simulation environment Indoor environment
7User-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.
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
Effect of Access Priority
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AP-associated based on the user-centric NM framework always outperforms other frameworks
25%-90% throughput gain
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
Throughput Comparison
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User-centric management provides highest throughput – max 69.3%
As the APs get saturated with load, the throughput becomes similar for all the system.
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
Throughput Comparison – Channel Selection
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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 decreasesUser-Centric Management of Wireless LANs - Y. Zhu, Q.
Ma, C. Bisdikian
Impact of Dual-Threshold on Throughput
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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.
User- centric under FCAPS NM
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
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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 informationattaining the optimization of NM activities
The simulation results throughputs can be significantly ↑ in NM activities over user-centric frameworkUser-Centric Management of Wireless LANs - Y. Zhu, Q.
Ma, C. Bisdikian
Conclusion
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Questions?
User-Centric Management of Wireless LANs - Y. Zhu, Q. Ma, C. Bisdikian
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[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.User-Centric Management of Wireless LANs - Y. Zhu, Q.
Ma, C. Bisdikian
References
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