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

2. Goal: Improve WLAN network performance
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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

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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

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

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

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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

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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 WLAN. NCC
T. Korakis, O. Ercetin, S. V. Krishnamurthy, L. Tassiulas, S. Tripathi. Link Quality Based Association Mechanism in IEEE h Compliant Wireless LANs. RAWNET 2005.
B. Leung, K. Kim. Frequency Assignment for IEEE Wireless Networks. VTC 2003.
Y. Bejerano, S. Han, L. Li. Fairness and Load Balancing in Wireless LANs Using Association Control. MOBICOM 2004.