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Performance analysis of a multiple access protocol for voice and data support in broadband wireless LANs

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4 Author(s)
Fantacci, R. ; Dipt. di Elettronica e Telecomunicazioni, Firenze Univ., Italy ; Pecorella, T. ; Vannuccini, G. ; Vestri, G.

Wireless local area networks (WLANs) are one of the most promising access technologies for the upcoming fourth-generation wireless communication systems. In the last few years, several research efforts have been devoted to investigate possible multiple access schemes capable of supporting real-time traffic as well as best-effort data transmissions. In particular, the use of suitable transmission schemes allows not only to achieve higher data-rates, but also to optimize the allocation of traffic in the radio resources depending on the service requirements. In this paper we propose a multiple access scheme for a WLAN supporting real-time (voice) and best-effort (data) services, which exploits the presence of a broadband multiuser wireless access scheme such as orthogonal frequency division multiplexing (OFDM). OFDM allows dividing the radio bandwidth into several sub-bands, thus permitting a flexible resource allocation strategy to be deployed, while satisfying quality of service (QoS) requirements. A high overall network capacity in terms of simultaneously active users is achieved by effectively exploiting the multiuser capabilities offered by OFDM, together with a good service differentiation. A suitable theoretical analysis for the considered protocol has been carried out by applying the equilibrium point analysis (EPA) method, and computer simulation results have been compared with analytical predictions.

Published in:

Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th  (Volume:3 )

Date of Conference:

6-9 Oct. 2003