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Selfish Misbehavior in Wireless Networks: Understanding, Challenges, and Solutions

Explore the impact of selfish misbehavior in wireless networks, from increased deployment in unlicensed bands to users' trust and fair competition concerns. Learn about the analogy to speeding on highways and examples of misbehavior at different protocol layers. Understand the fundamental challenges of detecting and responding to misbehavior, and discover the research agenda for a civil wireless society. Visit www.crhc.uiuc.edu/wireless for more information.

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Selfish Misbehavior in Wireless Networks: Understanding, Challenges, and Solutions

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  1. Selfish Misbehavior inWireless Networks Nitin Vaidya University of Illinois at Urbana-Champaign www.crhc.uiuc.edu/wireless

  2. Increasing Wireless Deployment in Unlicensed Bands • Hot-spots • Community wireless networks • Home networks • Sensors • …

  3. Users Must Trust the Network • “Wired-equivalent” privacy mechanisms • Going beyond privacy … Users must be able to rely on “ fair ” competition

  4. Unlicensed Bands The New Wild Wild West ? • Increasing demand • Limited resources • Few rules ! • Increasinglyprogrammabledevices } Incentive for misbehavior } Tools for misbehavior

  5. Impact of Selfish Misbehavior • Benefits misbehaving users,at the cost of others • Reduces trustworthiness of the network Analogy : Speeding on the highways

  6. Examples of Misbehavior • Misbehavior can occur at all layers of the protocol stack

  7. Example:Physical Layer • Using unnecessarily high transmit power

  8. Example:Medium Access Control Layer • 802.11 a wait-before-you-talk protocol • By waiting less than recommended, misbehaving users benefit

  9. Example:Network Layer • In mesh networks,misbehaving users may use their links only when convenient to self

  10. Selfish Misbehavior • Not unique to wireless networks • TCP misbehaviors identified in the past • But … • Wireless brings new challenges • Misbehavior more likely in wireless networks due to limited resources

  11. Fundamental Challenges • Wireless channel varies over space & time • Impossible to detect misbehavior with 100% accuracy • How to do “well enough” ? • What are the limits on accuracy ?

  12. Fundamental Challenges • Misbehavior cannot always be handled at the layer at which it occurs • Cross-layer detection & response

  13. Fundamental Challenges • Different protocols must co-existon same slice of wireless spectrum • Different protocolsdon’t necessarily know each other

  14. Research Agenda A Civil Wireless Society • Protocol mechanisms toDeter, DetectandPenalize misbehaviors, and Encourage Cooperation • Layer-based classification of misbehaviors • Determine fundamental limits

  15. Thanks! www.crhc.uiuc.edu/wireless

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