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ThinkMind // International Journal On Advances in Networks and Services, volume 5, numbers 3 and 4, 2012 // View article netser_v5_n34_2012_3

Capacity Evaluation of a New Scheduler with Call Admission Control to Fixed WiMAX Networks with Delay Bound Guarantee

Authors:
Eden Ricardo Dosciatti
Walter Godoy Junior
Augusto Foronda

Keywords: IEEE 802.16; WiMAX; QoS; Latency-Rate; scheduling; time frame; call admission control.

Abstract:
IEEE 802.16, also known as WiMAX, is a solution for mobile and fixed access to broadband networks, currently in development by the Working Group of the Institute of Electrical and Electronics Engineers - IEEE. The WiMAX Working Group focuses on the development of a standard for wireless broadband metropolitan area networks, whose main goal is to allow high-speed access to data, video and voice services. As a wireless broadband technology, WiMAX networks implement Quality of Service (QoS) mechanisms as a crucial element to satisfy users’ demands for high data rates. QoS mechanisms and bandwidth allocation are covered by IEEE 802.16 standard. However, the exact details of scheduling and call admission control management, which guarantee QoS as required by multimedia applications, are left unspecified by the standard. In fact, the standard supports scheduling only for fixed-size real-time service flows. The choice of a scheduling algorithm for WiMAX systems is of major importance. A efficient, robust and fair WiMAX scheduling algorithm is still an open issue. Based on these facts, a new scheduler with call admission control with delay bound guarantee was proposed. The new scheduler calculates an optimal time frame, which allows the number of stations allocated in the system to be maximized and manages the delays required by each user. Properties of this algorithm are investigated both theoretically and through simulations. The results show that an upper bound on the delay can be achieved for a large range of network loads, with bandwidth optimization.

Pages: 198 to 209

Copyright: Copyright (c) to authors, 2012. Used with permission.

Publication date: December 31, 2012

Published in: journal

ISSN: 1942-2644
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