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Performance Evaluation of the IEEE 802.16 MAC for QoS Support Claudio Cicconetti, Alessandro Erta, Luciano Lenzini, and Enzo Mingozzi Abstract —The IEEE 802.16 is a standard for broadband wireless communication in Metropolitan Area Networks (MAN). To meet the QoS requirements of multimedia applications, the IEEE 802.16 standard provides four different scheduling services: Unsolicited Grant Service (UGS), real-time Polling Service (rtPS), non-real-time Polling Service (nrtPS), and Best Effort (BE). The paper is aimed at verifying, via simulation, the effectiveness of rtPS, nrtPS, and BE (but UGS) in managing traffic generated by data and multimedia sources. Performance is assessed for an IEEE 802.16 wireless system working in Point-to-Multipoint (PMP) mode, with Frequency Division Duplex (FDD), and with full-duplex Subscriber Stations (SSs). Our results show that the performance of the system, in terms of throughput and delay, depends on several factors. These include the frame duration, the mechanisms for requesting uplink bandwidth, and the offered load partitioning, i.e., the way traffic is distributed among SSs, connections within each SS, and traffic sources within each connection. The results also highlight that the rtPS scheduling service is a very robust scheduling service for meeting the delay requirements of multimedia applications. Index Terms —IEEE 802.16, broadband wireless access, MAC protocols, quality of service, scheduling algorithms, performance evaluation. Ç 1I NTRODUCTION D URING the last few years, commercial and residential users have witnessed a rapid growth of new services based on multimedia applications, such as Voice over IP (VoIP), video conferencing, Video on Demand (VoD), massive online gaming, and peer-to-peer. The most im- portant driving factor behind this dramatic rise is the increasing availability of broadband access, based on leased lines using fiber optic links, cable modems, and digital subscriber line (xDSL) access networks. At the same time, users have become familiar with personal devices, such as laptops, palmtops, and cellular phones, and are thus reliant on ubiquitous service. Industry and research communities are consequently investing considerable effort in the con- vergence of multimedia services and ubiquitous instant access, which by necessity depends on the use of Broadband Wireless Access (BWA) technologies [1]. Standards for BWA are being developed within IEEE project 802, Working Group 16, often referred to as 802.16. The IEEE 802.16 standard is also known in the trade press as Worldwide Interoperability for Microwave Access (WiMAX). The current version of the standard was published in 2004 [12], though the standardization process is still ongoing [13]. The 802.16 standard specifies two modes for sharing the wireless medium: Point-to-Multipoint (PMP) and Mesh (optional). In the PMP mode, the nodes are organized into a cellular-like structure, where a base station (BS) serves a set of subscriber stations (SSs) within the same antenna sector in a broadcast manner, with all SSs receiving the same transmission from the BS. Transmissions from SSs are
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This note was uploaded on 11/30/2011 for the course CIS 6930 taught by Professor Staff during the Fall '08 term at University of Florida.

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