ABSTRACT
Orthogonal frequency division multiple access (OFDMA)-based WiMAX technology has emerged as a promising technology for broadband access in a wireless metropolitan area network (WMAN) environment. In this chapter, we address the problem of queueing theoretic performance modeling and analysis of OFDMA-based broadband wireless networks. We fi rst review the related works on queueing analysis of wireless transmission systems. To provide a background for the presented queueing model, an introduction to stochastic process and Discrete-Time Markov Chain (DTMC) is presented. We consider a single-cell WiMAX environment in which the base station allocates subchannels to the subscriber stations in its coverage area. Th e subchannels allocated to a subscriber station are shared by multiple connections at
that subscriber station. To ensure the quality-of-service (QoS) performances, two connection admission control (CAC) schemes, namely, threshold-based and queueaware CAC schemes, are considered at a subscriber station. A queueing analytical framework for these admission control schemes is presented considering OFDMAbased transmission at the physical layer. Th en, based on the queueing model, both the connection-level and the packet-level performances are studied.
