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Design of an enhanced access point to optimize TCP performance in Wi-Fi hotspot networks

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Abstract

In the last years, the number of Wi-Fi hotspots at public venues has undergone a substantial growth, promoting the WLAN technologies as the ubiquitous solution to provide high-speed wireless connectivity in public areas. However, the adoption of a random access CSMA-based paradigm for the 802.11 MAC protocol makes difficult to ensure high throughput and a fair allocation of radio resources in 802.11-based WLANs. In this paper we evaluate extensively via simulations the interaction between the flow control mechanisms implemented at the TCP layer and the contention avoidance techniques used at the 802.11 MAC layer. We conducted our study considering initially M wireless stations performing downloads from the Internet. From our results, we observed that the TCP downlink throughput is not limited by the collision events, but by the inability of the MAC protocol to assign a higher chance of accessing the channel to the base station. We propose a simple and easy to implement modification of the base station’s behavior with the purpose of increasing the TCP throughput reducing useless MAC protocol overheads. With our scheme, the base station is allowed to transmit periodically bursts of data frames towards the mobile hosts. We design a resource allocation protocol aimed at maximizing the success probability of the uplink transmissions by dynamically adapting the burst length to the collision probability estimated by the base station. By its design, our scheme is also beneficial to achieve a fairer allocation of the channel bandwidth among the downlink and uplink flows, and among TCP and UDP flows. Simulation results confirm both the improvement in the TCP downlink throughput and the reduction of system unfairness.

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References

  1. Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications/Amendment 2: Higher-speed Physical Layer (PHY) in the 2.4 GHz band, ANSI/IEEE Std. 802.11b (November 2001).

  2. Part 11: wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications/Amendment 1: High-speed Physical Layer in the $5$ GHz Band, ANSI/IEEE Std. 802.11a (November 2000).

  3. Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications/Amendment 4: Further Higher Data Rate Extension in the $2.4$ GHz Band, ANSI/IEEE Std. 802.11g (June 2003).

  4. A. Balachandran, G. Volker and P. Bahl, Wireless Hotspots: Current Challenges and Future Directions, in: Proceedings of the First ACM Workshop on Wireless Mobile Applications And Services On WLAN Hotspots(WMASH’03) (San Diego, California, September 2003) pp. 2–8.

  5. F. Calí, M. Conti and E. Gregori, Dynamic Tuning of the IEEE 802.11 Protocol to Achieve a Theorethical Throughput Limit, IEEE/ACM Trans. Networking 8(6) (December 2000) 785–799.

    Article  Google Scholar 

  6. G. Bianchi, Performance Analysis of the IEEE 802.11 Distributed Coordination Function, IEEE J. Select. Areas Commun. 18(9) (December 2000) 1787–1800.

    Google Scholar 

  7. R. Bruno, M. Conti and E. Gregori, Optimization of Efficiency and Energy Consumption in $p$-Persistent CSMA-Based Wireless LANs, IEEE Trans. Mob. Comp. 1(1) (March 2002) 10–31.

    Article  Google Scholar 

  8. G. Xylomenos and G. C. Polyzos, TCP and UDP Performance over a Wireless LAN, in: Proceedings of IEEE INFOCOM’99 (New York, NY, March 1999) pp. 439–446.

  9. M. G. Arranz, R. Agüero, L. Muñoz and P. Mahõnen, Behavior of UDP-Based Applications over IEEE 802.11 Wireless Networks, in: Proceedings of 12 th International Symposium on Personal Indoor Mobile Radio Communication (PIMRC) (San Diego, CA, September 2001) pp. 72–77.

  10. M. Bottigliengo, C. Casetti, C.-F. Chiasserini and M. Meo, Short-term Fairness of TCP Flows in 802.11b WLANs, in: Proceedings of IEEE INFOCOM’04 (Hong Kong, China, March 2004).

  11. S. Pilosof, R. Ramjee, D. Raz, Y. Shavitt and P. Sinha, Understanding TCP fairness over Wireless LAN, in: Proceedings of IEEE INFOCOM’03 (San Francisco, CA, March–April 2003) pp. 836–843.

  12. M. Heusse, F. Rousseau, G. Berger-Sabbatel and A. Duda, Performance Anomaly of 802.11b, in: Proceedings of IEEE INFOCOM’03 (San Francisco, CA, March–April 2003) pp. 863–872.

  13. D. Tang and M. Baker, Analysis of a Local-Area Wireless Network, in: Proceedings of the 6th ACM Conference on Mobile Computing and Networking (MobiCom’00) (Boston, Massachusetts, August 2000) pp. 1–10.

  14. D. Kotz and K. Essien, Analysis of a Campus-wide Wireless Network, in: Proceedings of the 8th ACM Conference on Mobile Computing and Networking (MobiCom’02) (Atlanta, Georgia, September 2002) pp. 107–118.

  15. R. Bruno, M. Conti and E. Gregori, Throughput Evaluation and Enhancement of TCP Clients in Wi-Fi Hot Spots, in: Proceedings of First Conference on Wireless On-Demand Systems (Madonna di Campiglio, Italy, January 2004) pp. 392–396.

  16. R. Bruno, M. Conti and E. Gregori, Analytical Modeling of TCP Clients in Wi-Fi Hot Spot Networks, in: Proceedings of The Third IFIP-TC6 Networking Conference (Athens, Greece, May 2004).

  17. W. Stevens, TCP Illustrated, Volume 1: The Protocols (New York, NY: Addison-Wesley, July 2001).

  18. L. Bononi, M. Conti and L. Donatiello, Design and Performance Evaluation of a Distributed Contention Control (DCC) Mechanism for IEEE 802.11 Wireless Local Area Networks, Journal on Parallel and Distributed Computing 60(4) (April 2000).

  19. F. Calí, M. Conti and E. Gregori, Dynamic IEEE 802.11: Design, Modeling and Performance Evaluation, IEEE J. Select. Areas Commun. 18(9) (Sept. 2000) 1774–1786.

    Article  Google Scholar 

  20. Y. Kwon, Y. Fang and H. Latchman, A Novel MAC Protocol with Fast Collision Resolution for Wireless LANs, in: Proceedings of IEEE INFOCOM’03 (San Francisco, CA, March–April 2003) pp. 853–862.

  21. Draft supplement to Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: MAC Enhancements for Quality of Service, ANSI/IEEE Std. 802.11e/Draft 5.0 (September 2003).

  22. D.-J. Deng and R.-S. Chang, A priority scheme for IEEE 802.11 DCF access method, IEICE Trans. on Comm., E82-B(1) (January 1999) 96–102

  23. N. Vaidya, V. Bahl and S. Gupta, Distributed fair scheduling in a wireless LAN, in: Proceedings of IEEE/ACM Mobicom’00 (Boston, Massachusetts, August 2000) pp. 167–178.

  24. I. Aad and C. Castelluccia, Differentiation mechanisms for IEEE 802.11, in: Proceedings of IEEE INFOCOM’01 (Anchorage, Alaska, April 2001) pp. 209–218.

  25. R. Battiti, M. Conti, E. Gregori and M. Sabel, Price-Based Congestion-Control in Wi-Fi Hot Spots, in: Proceedings of IEEE/ ACM WiOpt’03 (Sophia-Antipolis, France, March 2003).

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Authors and Affiliations

  1. Institute of Informatics and Telematics (IIT), Italian National Research Council (CNR), Via G. Moruzzi 1, 56126, Pisa, Italy

    Raffaele Bruno, Marco Conti & Enrico Gregori

Authors
  1. Raffaele Bruno
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  2. Marco Conti
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  3. Enrico Gregori
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Correspondence to Marco Conti.

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Bruno, R., Conti, M. & Gregori, E. Design of an enhanced access point to optimize TCP performance in Wi-Fi hotspot networks. Wireless Netw 13, 259–274 (2007). https://doi.org/10.1007/s11276-006-6466-9

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  • DOI: https://doi.org/10.1007/s11276-006-6466-9

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