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Applications of Game Theory for Power Control in Wireless Networks of Autonomous Entities

Applications of Game Theory for Power Control in Wireless Networks of Autonomous Entities. Vaggelis G. Douros. «Το ΟΠΑ Ερευνά» , 23.04.2013. Πρόγραμμα ΗΡΑΚΛΕΙΤΟΣ ΙΙ. Motivation & Challenges(1).

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Applications of Game Theory for Power Control in Wireless Networks of Autonomous Entities

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  1. Applications of Game Theory for Power Control in Wireless Networks of Autonomous Entities Vaggelis G. Douros «Το ΟΠΑ Ερευνά», 23.04.2013 Πρόγραμμα ΗΡΑΚΛΕΙΤΟΣ ΙΙ

  2. Motivation & Challenges(1) • “The number of mobile-connected devices will exceed the world’s population in 2013”, Cisco, Feb. 2013 • Map of Fon Wi-Fi APs in (part of) London, April 2013 • via http://corp.fon.com/maps

  3. Motivation & Challenges(2) • + All other APs + other wireless • devices… Too many devices • coexist in the same area • and compete for radio spectrum • (-) very limited resource • The problem: (-) Too much interference • The challenge: (How) Can we control it? http://www.ntia.doc.gov/osmhome/allochrt.PDF

  4. On the Interference Mitigation in Wireless Networks Through… • Power control (PC): How to choose the transmission power to achieve a Quality of Service (QoS) target • Some challenges for a successful power control algorithm [1] http://wcdma3g.blogspot.gr/

  5. Power Control Using Game Theory • We focus on scenarios where nodes have differentQoS targets and (at least some of) them are autonomous (e.g., APs) • We need distributed power control schemes • Competition for resources among players • =(non-cooperative) game theory • Key Issues/Our Roadmap: • Has the game a Nash Equilibrium (NE)? • How can we find it? • Is it unique? If not, which to choose? • Is it (Pareto) efficient?

  6. Negotiation-Based Distributed Power Control (1) [2] • Trunc(ated) Power Control [Zander, TVT ’92] • (-) Unfair for this node – no opportunity to achieve its target • More importantly: how to oblige an autonomous entity to power off? I am 15% below my QoStarget  I am 40% below my QoStarget I am 20% below my QoStarget  I achieved my QoStarget 

  7. Negotiation-Based Distributed Power Control (2) • We cannot dictate to an AP to power off/reduce its power! • Unsatisfied links negotiate in pairs. Each one uses part of its budget to make an offer to the other I offer you 100 credits if you reduce your power 20% I am 15% below my QoStarget  OK! No thanks! I am 20% below my QoStarget  I achieved my QoStarget  I am 40% below my QoStarget

  8. Non-Cooperative Power Control in Small Cell Networks • Small cells are low-powerdevices that operate in licensed spectrum • More devices…more interference! • Two-tier small cell network http://www.smallcellforum.org

  9. Power Control Under Best Response Dynamics in Small Cell Networks (1) [3] • Heterogeneousnodes-heterogeneousutility functions • MN Utility Function: • SCN Utility Function:

  10. Power Control Under Best Response Dynamics in Small Cell Networks (2) [3] • Best response dynamics power control scheme • MN power control: • SCN power control: • (+) simple scheme • (+) distributed algorithm • We show the existence and uniqueness of a NE in this scheme • Interference mitigation in various scenarios is achieved

  11. References • [1] V.G. Douros and G.C. Polyzos, “Review of Some Fundamental Approaches for Power Control in Wireless Networks,” Elsevier Computer Communications, vol. 34, no. 13, pp. 1580-1592, August 2011. • [2] V.G. Douros, G.C. Polyzos and S. Toumpis, “Negotiation-Based Distributed Power Control in Wireless Networks with Autonomous Nodes,” Proc. 73rd IEEE Vehicular Technology Conference (VTC2011-Spring), Budapest, Hungary, May 2011. • [3] V.G. Douros, S. Toumpis and G.C. Polyzos, “Power Control Under Best Response Dynamics for Interference Mitigation in a Two-Tier Femtocell Network,” Proc. 8th International Workshop on Resource Allocation and Cooperation in Wireless Networks (RAWNET), Paderborn, Germany, May 2012.

  12.  Ευχαριστώ! Vaggelis G. Douros Mobile Multimedia Laboratory Department of Informatics Athens University of Economics and Business douros@aueb.gr http://mm.aueb.gr/~douros

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