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Traffic Police Enhancement for E-DCF

Learn how Traffic Police helps limit traffic, prevent abuse, and enhance network efficiency for public access environments. Proposal for DCF integration and 802.11 compatibility.

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Traffic Police Enhancement for E-DCF

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  1. Traffic Police Enhancement for E-DCF • Liwen Wu, liwwu@cisco.com (408-853-4065) • Bob Meier, rmeier@cisco.com (330-664-7850) • Doug Smith, dsmit@cisco.com (905-305-0045) • Cisco Systems Liwen Wu, Cisco Systems

  2. What is Traffic Police • Traffic Police allows AP to limit the traffic from a single station Liwen Wu, Cisco Systems

  3. Why Traffic Police • Prevent unwanted excessive amount of traffic from going through AP into wired network • Prevent a abusive station from taking radio resources away from other stations of the same traffic category • Prevent premium class traffic from starving the best effort traffic • An ISP operator may want to have a option not letting best effort user to use more than what they paid for. Liwen Wu, Cisco Systems

  4. Shared Radio medium When all Stations send data within its limit Liwen Wu, Cisco Systems

  5. Shared Radio medium When One Station is abusing the radio resource, other stations get less than they suppose to get Liwen Wu, Cisco Systems

  6. Where do we use Traffic Police • In Public Access environment, where stations are untrusted entities, such as: • Airports(e.g. DCF) • Hotel(e.g. DCF) • Conference(e.g. DCF) • Internet Café(e.g. DCF) • last mile(e.g. PCF) Liwen Wu, Cisco Systems

  7. How to Traffic Police • Traffic Police inside AP, drop the unwanted excess packets. • Draw back: This does NOT protect radio resource • Traffic Police on radio medium access Liwen Wu, Cisco Systems

  8. Traffic Police Proposal for DCF • Define a new Action Code in Action Frame • category code=1; QoS management • action code = 10; traffic police • EAP can send an “Traffic Police” Action frame to: • a ESTA, to police that station • If a ESTA station is the RA of this “Traffic Police” Action frame, it must set its NAV to the value specified in the ‘Duration’ field. Liwen Wu, Cisco Systems

  9. data1 data2 data4 Ack Ack exceed the limit!!! “Traffic Police” wait Traffic Police of a ESTA Liwen Wu, Cisco Systems

  10. 802.11 Compatibility • All 802.11 stations will set their NAV to the value in the ‘Duration’ field . Then, they all have to wait for that time period • . All other 802.11e stations will ignore this ‘Duration’ field Liwen Wu, Cisco Systems

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