Modulo N Backoff Scheme for Effective QoS Differentiation and Increased Bandwidth Utilization in IEEE 802.11 Networks

• Autorzy: Janczar T. , Konorski J. , Wodniak J. , Pawlikowski K.
• Języki publikacji: EN

Abstrakty

EN

The paper presents a new modulo N channel access scheme for wireless local area networks (WLANs). The novel solution derives from the distributed coordination function (DCF) of the IEEE 802.11 standard, further elaborated as enhanced distribution channel access (EDCA) by the 802.11e draft specification. The main innovation concerns improvement of the binary exponential backoff scheme used for collision avoidance in 802.11 networks. The most appealing feature of the new modulo N backoff scheme is that it outperforms the original 802.11 solution in terms of channel utilization ratio under any traffic conditions. Furthermore, the modulo N proposal can be naturally augmented with QoS differentiation mechanisms like 802.11e extensions. The prioritized modulo N scheme achieves better throughput-delay characteristics for multimedia traffic when compared with the original 802.11e proposal. At the same time, the new solution retains backward compatibility and includes all features which have made IEEE 802.11 networks extremely popular nowadays.

Słowa kluczowe

EN

channel access; MAC; performance analysis; random backoff; WLAN

• Wydawca: Instytut Łączności - Państwowy Instytut Badawczy
• Czasopismo: Journal of Telecommunications and Information Technology
• Rocznik: 2009
• Tom: nr 2
• Strony: 41--47
• Opis fizyczny: Bibliogr. 6 poz., rys.

Twórcy

autor

Janczar T.

autor

Konorski J.

autor

Wodniak J.

autor

Pawlikowski K.

• Intel Technology Poland, Słowackiego st 173, 80-298 Gdańsk, Poland,

Bibliografia

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• [2] “IEEE Standard for Information Technology – Telecommunications and Information Exchange between System – Local and Metropolitan Area Networks – Specific Requirements” – Part 11: “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specification”, IEEE 802.11-1999 [Online]. Available: www.ieee.org
• [3] “Draft Supplement 8.0 to Standard for Telecommunications and Information Exchange between Systems – LAN/MAN Specific Requirements” – Part 11: “Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Medium Access Control (MAC) Enhancements for Quality of Service (QoS)”, IEEE Draft 802.11e-2005.
• [4] “Supplement to IEEE Standard for Information Technology Telecommunications and Information Exchange between System – LAN/MAN Specific Requirements” – Part 11: “Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: High-Speed Physical Layer in the 5 GHZ Band”, IEEE 802.11a-1999 [Online]. Available: www.ieee.org
• [5] F. Cali, M. Conti, and E. Gregori, “Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit”, IEEE/ACM Trans. Netw., vol. 8, no. 6, pp. 785–799, 2002.
• [6] M. Natkaniec and A. Pach, “An analysis of modified backoff mechanism in IEEE 802.11 networks”, in Proc. Polish-German Teletraf. Symp. PGTS’2000, Dresden, Germany, 2000.