MDG: MEASUREMENT-DRIVEN GUIDELINES FOR WLAN DESIGN

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Presentation transcript:

MDG: MEASUREMENT-DRIVEN GUIDELINES FOR 802.11 WLAN DESIGN 1/14/2019 MDG: MEASUREMENT-DRIVEN GUIDELINES FOR 802.11 WLAN DESIGN Ioannis Broustis, Konstantina Papagiannaki, Srikanth V. Krishnamurthy, Michalis Faloutsos, Vivek Mhatre ACM MOBICOM 2007

Goal: Improve WLAN network performance 1/14/2019 Three functions to improve network performance in dense WLANs Frequency selection Provides spatial separation between interfering APs User association Provides load balancing among APs Power control APs shrink their cells to facilitate higher spatial reuse of spectrum

1/14/2019 Frequency Selection Neighbor Access Points (APs) select different frequencies in order to mitigate interference from each other AP Cell of B Cell of A Channel 6 Channel 11 B A AP AP Channel 6 Channel 6 Inter-cell Contention: A cannot transmit because B is transmitting

1/14/2019 User Association Users select less-loaded Access Points (APs) in order to get more throughput A B AP AP C

1/14/2019 Power Control APs shrink their overlapping cells in order to reduce interference and improve spatial reuse A B AP AP

1/14/2019 Problem statement Which are the functions that should be applied in a specific scenario? In what sequence should they be applied? High level objective: to maximize a fair notion of aggregate network throughput

1/14/2019 Previous Work Most studies have tried to optimize one of these functions No studies on the interdependencies between all three functions A. Mishra, V. Shrivastava, D. Agarwal, S. Banerjee. Distributed Channel Management in Uncoordinated Wireless Environments. MOBICOM 2006. N. Ahmed, S. Keshav. SMARTA: A Self-Managing Architecture for Thin Access Points. CoNEXT 2006. K. Sundaresan, K. Papagiannaki. The Need for Cross-Layer Information in Access Point Selection Algorithms. IMC 2006. A. Mishra, V. Brik, S. Banerjee, A. Srinivasan, W. Arbaugh. A Client-Driven Approach for Channel Management in Wireless LANs. INFOCOM 2006. A. Kumar, V. Kumar. Optimal Association of Stations and APs in an IEEE 802.11 WLAN. NCC 2005. T. Korakis, O. Ercetin, S. V. Krishnamurthy, L. Tassiulas, S. Tripathi. Link Quality Based Association Mechanism in IEEE 802.11h Compliant Wireless LANs. RAWNET 2005. B. Leung, K. Kim. Frequency Assignment for IEEE 802.11 Wireless Networks. VTC 2003. Y. Bejerano, S. Han, L. Li. Fairness and Load Balancing in Wireless LANs Using Association Control. MOBICOM 2004.