Call Admission Control Algorithms in OFDM-based Wireless Multiservice Networks

Orthogonal frequencydivisionmultiplexing (OFDM) is becoming a fundamental technology in future generation wireless communications. Call admission control is an effective mechanism to guarantee resilient, efficient, and quality-of-service (QoS) services in wireless mobile networks. In this paper, we present several call admission control algorithms for OFDM-based wireless multiservice networks. Call connection requests are differentiated into narrow-band calls and wide-band calls. For either class of calls, the traffic process is characterized as batch arrival since each call may request multiple subcarriers to satisfy its QoS requirement. The batch size is a random variable following a probability mass function (PMF) with realistically maximum value. In addition, the service times for wide-band and narrow-band calls are different. Following this, we perform a tele-traffic queueing analysis for OFDM-based wireless multiservice networks. The formulae for the significant performance metrics call blocking probability and bandwidth utilization are developed. Numerical investigations are presented to demonstrate the interaction between key parameters and performance metrics. The performance tradeoff among different call admission control algorithms is discussed. Moreover, the analytical model has been validated by simulation. The methodology Y. Zhang (B) Simula Research Laboratory, Martin Linges vei 17, Fornebu, P. O. Box 134, 1325 Lysaker, Norway e-mail: [email protected] Y. Chen University of Greenwich, London, UK e-mail: [email protected] J. He Swansea University, Swansea, UK e-mail: [email protected] C.-X. Wang Heriot Watt University, Edinburgh, UK e-mail: [email protected] A. V. Vasilakos University of Western Macedonia, Athens, Greece e-mail: [email protected]