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Broadband Wireless Access (BWA) offers QoS-aware broadband access through a wireless medium, being IEEE 802.16 one of the BWA standards. In it, the Base Station (BS) is responsible of allocating the required bandwidth by the rest of nodes, acting as a central controller. The other nodes, Subscriber Stations (SSs), have to send a bandwidth request to give the BS the knowledge about their needs, taking...
The IEEE 802.16 standard defines MAC and physical layer protocols for broadband wireless access, however it does not specify any scheduling algorithm. In this paper, we propose a RED-based Weighted Fair Priority Queuing algorithm for inter-class scheduling and a channel aware algorithm for intra-class scheduling. Weights of the service classes are adaptive according to the QoS requirements of each...
Throughput is always an important element in both fixed and wireless networks. This paper presents ODBA (On_Demand Bandwidth Allocation) mechanism in WiMAX network. In order to solve the current issues faced in WiMAX network, and improve QoS demand, a new mechanism, ODBA is designed. Tt is an on demand bandwidth allocation mechanism for WiMAX. ODBA depends on the different characters of different...
IEEE 802.16 standards specify four types of services, while how to design an efficient scheduling algorithm remains an open issue. Manufacturers can implement their own scheduling algorithms depending on their specific requirements. There are a lot of scheduling algorithms proposed in the literature. Several scheduling algorithms propose hierarchical structures with strict priority or one-level scheduling...
The IEEE 802.16 standard is expected to become a successful broadband wireless access solution, especially thanks to its ablility to provide high data rates, to differentiate services, and thanks to its interoperability, as promoted by the worldwide interoperability for microwave access (WiMAX) organization. We consider in this paper an Orthogonal frequency division multiple access (OFDMA)-based 802...
In this paper, we propose a new packet scheduling algorithm for IEEE 802.16 wireless access systems running time division duplex (TDD) mode. We compare the performance of the proposed algorithm to others in terms of bandwidth and fairness in details. The simulation results show that not only the newly proposed algorithm can handle the dynamic bandwidth allocation to achieve higher throughput, but...
The next generation of wireless networks is envisioned as convergence of heterogeneous radio access networks. Since technologies are becoming more collaborative, a possible integration between IEEE 802.16 based network and previous generation of telecommunication systems (2G, ..., 3G) must be considered. A novel quality function based vertical handoff (VHO) algorithm, based on proposed velocity and...
Broad band Wireless Access called WiMAX is becoming popular due to its support for QoS, in real time communication. To the best of our knowledge, the WiMAX base station (BS) schedules uplink (UL) and downlink (DL) packets station wise and within a station scheduling is done with respect to priority of services. In this process, while BS transmits packets of different priorities for a subscriber station...
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