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Selfish Misbehavior in Wireless Networks

Selfish Misbehavior in Wireless Networks. Nitin Vaidya University of Illinois at Urbana-Champaign www.crhc.uiuc.edu/wireless. Increasing Wireless Deployment in Unlicensed Bands. Hot-spots Community wireless networks Home networks Sensors …. Users Must Trust the Network.

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Selfish Misbehavior in Wireless Networks

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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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