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Preliminary Analysis of the TCP Behavior in a 802.16 Network

Preliminary Analysis of the TCP Behavior in a 802.16 Network. Jesus A. Perez, Benoit Donnet , Olivier Bonaventure 1st WEIRD Workshop - Coimbra - May 2007. Wireless Technology. Wireless Technology (2). Wireless Technology (3). Incorporates TCP/IP in the protocol stack

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Preliminary Analysis of the TCP Behavior in a 802.16 Network

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  1. Preliminary Analysis of the TCP Behavior in a 802.16 Network • Jesus A. Perez, Benoit Donnet, Olivier Bonaventure • 1st WEIRD Workshop - Coimbra - May 2007

  2. Wireless Technology

  3. Wireless Technology (2)

  4. Wireless Technology (3) • Incorporates TCP/IP in the protocol stack • TCP was designed for wired networks • TCP extensions were proposed for wireless • TCP Westwood, TCP Jersey, TCP Veno, J-TCP

  5. WiMAX • WiMAX has the potential to serve as • a wireless extension • an alternative to cable/DSL (last mile/hop behavior) • WiMAX is supposed to be cheaper and easily deployed in sparsely populated areas

  6. WiMAX - Problem • WiMAX has been essentially evaluated through simulation • Quid of the TCP behavior in a real WiMAX environment? • Interest in RTT • Interest in delay and packet loss

  7. Testbed

  8. Measurement setup • Pre-WiMAX connection hired from a Belgian provider • Standard Linux TCP implementation • BIC TCP with SACK, D-SACK and FACK • Downlink measurements • from LABO to CWIMAX • both clocks are synchronized • 10 min. traffic generated by iPerf every 2 hours • repeated 12 times

  9. RTT

  10. Delay - Loss

  11. Delay - Loss (2)

  12. Delay - Loss (3)

  13. Conclusion • First measurement study of TCP behavior in a real WiMAX environment • RTT • Packet loss and delay • One day measurement • http://inl.info.ucl.ac.be/files/data-18.11.2006.tar.gz • This is a first step

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