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The IEEE 802.16 standard for broadband wireless access is a low cost solution for Internetaccess in metropolitan and rural areas. Although it defines five service levels to support real-time and bandwidth demanding applications, scheduling mechanisms are not specified in the standard. Due to the wireless channel variability, scheduling mechanisms widely studied for wired networks are not suitable...
Quality communication over the wireless channel is now promised because of the advent of the broadband wireless. High speed data access is expected to be provided to subscribers through broadband wireless access. We propose a joint Call Admission Control (CAC) and Bandwidth Allocation (BA) for an IEEE 802.16 based WiMAX system. The presented schemes aim to provide QoS support along with a fair resource...
4G cellular systems and the IMT Advanced candidates will provide broadband wireless access with QoS. Especially in multihop configurations of these systems the base station controls resources centrally while relays can take over a part of the responsibility on the second hop. To make this work on layer two, scheduling is the most important task. However, many dimensions of the problem lead to much...
IEEE 802.16 standard provides a mechanism for maximum use of broadband wireless channel. The primary advantages of WiMAX standard are high data rates, broadband wireless access, high quality of services, and long coverage range with low deployment cost on a metropolitan scale. An efficient method for maximum use of channel capacity is concurrent data transmission. In the WiMAX Mesh mode, allocation...
In IEEE 802.16e wireless metropolitan area networks, users could take their broadband connections with them as they move from one location to another with different speeds. Providing QoS is more challenging for mobile subscribers at vehicular speeds than for others. On the other hand, time variability and unpredictability of the wireless channel may cause QoS degradation for these users. Therefore,...
WiMAX is considered one of the most prominent technologies for providing a Broadband Wireless Access (BWA) in a metropolitan area. Among several strategies, the adaptive modulation techniques has been selected for providing an efficient non line of sight (NLOS) coverage. Adaptive modulation allows the system to adapt the modulation scheme according to the channel conditions in order to enhance the...
The Broadband Wireless Access (BWA) technology has been proposed to support different traffic classes with distinct quality of service (QoS) requirements in broadband metropolitan area networks. Therefore, as part of its specifications, such a system must properly address the combined requirements of wireless communications and multimedia applications. We propose in this paper an extension to the...
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