The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
IEEE 802.16 based Worldwide Interoperability for Microwave Access networks (WiMAX) are increasingly being deployed for last hop broadband wireless access. In order to provide the high speed access to information resources broadband technology like WiMAX is needed. In this paper we compared different uplink scheduling algorithms of WiMAX mainly maximum carrier to interference and noise (Max C/I) algorithm...
WiMAX is one of the most familiar broadband wireless access technologies that support multimedia transmission. IEEE802.16 Medium Access Control (MAC) covers a large area for bandwidth allocation and QoS mechanisms for various types of applications. Nevertheless, the standard lacks a MAC scheduling algorithm that has a multi-dimensional objective of satisfying QoS requirements of the users, maximizing...
The broadband wireless access based on the IEEE 802.16 standard known like WiMAX, is a technology promise to provide services in next generation wireless systems with high transmission rates and quality of service (QoS), this standard use a control access connection oriented (MAC), and define some QoS schemes. In this paper we show some scheduling algorithms such as Round Robin (RR) and Defic Round...
The IEEE 802.16/WiMAX mesh network, which is dynamically self-organized and self-configured, is a promising solution for wireless broadband access in metropolitan scale with a cost-effective deployment. As in most wireless multi-hop networks, traffic scheduler in MAC is one of most important factor for the performance of 802.16 mesh networks. Two scheduling modes, centralized scheduling and distributed...
A wide range of emerging real-time services require different levels of Quality of Services (QoS) guarantees over wireless networks. Scheduling algorithms play a key role in meeting these QoS requirements. Most of research in this area have been focused on deterministic delay bounds and the statistical bounds of differentiated real-time services are not well known. This paper provides the mathematical...
Demand of high quality broadband wireless systems is quickly and continuously increasing day by day. Nowadays, one of the most promising Broadband Wireless Access (BWA) technologies is Worldwide Interoperability for Microwave Access (WiMAX), characterized by the IEEE 802.16 standard. Efficient data transmission and available bandwidth use optimization are main factors which indicate quality of any...
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...
Long Term Evolution represents an emerging and promising technology for providing a broadband ubiquitous Internet access. But several aspects have to be considered in order to provide an effective service to users. In particular, in this work, we consider the problem of optimizing the performance of real time downlink communications using a novel two-level scheduling algorithm. The upper level exploits...
Orthogonal Frequency Division Multiple Access (OFDMA) is the multiple access technology that may be used in the next generation broadband wireless communication systems. We devise some new algorithms which use the linear combination of two variables as the objective matrix. In these algorithms, both cell throughput and user fairness are considered. To guarantee the user quality of service (QoS), we...
Next generation mobile networks are expected to provide seamless personal mobile communication and quality of service (QoS). Fair, class based service and Lossless handoff are the key issues for providing the QoS. This paper proposes a scheduling mechanism for providing QoS in mobile networks, which exploit IP as a transport technology for transferring data between base stations of Broadband Wireless...
The success of emerging Broadband Wireless Access Systems (BWAs) depend on their ability to utilize the network resources in an efficient way. It's a complex task due to heterogeneous service nature and diverse Quality of Service (QoS) requirements of different applications that these systems support. Packet scheduling is one of the key components to provide QoS that plays a vital role in BWAs. This...
The IEEE 802.16 standard defines MAC and Physical layers for broadband wireless networks called WiMAX, however, it does not define the scheduling algorithm for the uplink and downlink traffic. In this paper, a predictive scheduling algorithm for uplink traffic in IEEE 802.16 networks is proposed. The proposed algorithm uses the cross-layer approach and is applied on the queue of the bandwidth requests...
It has been proven that the IEEE 802.16 broadband wireless access (BWA) network is the most preferable next-generation network with the well defined quality of service (QoS) framework. Due to lack of the scheduling algorithm for the guaranteed QoS in the IEEE 802.16 standard, many results for the scheduler of the IEEE 802.16 BWA network have been proposed. However, for the downlink transmission with...
QoS provisioning is an important issue for deploying broadband wireless access networks with real-time and non-realtime traffic integration. Opportunistic MAC (OMAC) protocol combines cross-layer design and opportunistic scheduling scheme to achieve high utilization while providing QoS supports to various applications. In this paper, we propose a cross-layer MAC protocol and scheduling framework with...
With the ever-growing demand for multimedia applications over broadband wireless access networks, an efficient traffic scheduler is deemed crucial for the provision of quality-of-service (QoS). A large number of traffic scheduler schemes have been proposed, and those equipped with channel-aware capability appear to be most promising. These schedulers are capable of exploiting the dynamic channel condition...
A new Packet Scheduler whose architecture is based on the cross-layer paradigm is proposed for the IEEE 802.16e standard of Mobile WiMAX networks. The scheduler combines functionalities derived from the use of the utility function concept from economics, for the satisfaction of the maximum packet delay from real time service flows, and the token bucket principle for the support of minimum throughput...
The limitation on the battery lifetime has been a critical issue for the advancement of mobile computing. Different types of power-saving techniques have been proposed in various fields. In order to provide feasible energy-conserving mechanisms for the mobile subscriber stations (MSSs), three power-saving types have been proposed for the IEEE 802.16e broadband wireless networks. However, these power-saving...
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...
IEEE 802.16 standard defines the broadband wireless access specification for WiMAX, but it did not specify a standard scheme for scheduling algorithms and admission control. As a result, we propose an uplink scheduling scheme called Random Early Detection based Deficit Fair Priority Queue (RED-based DFPQ) for WiMAX. RED-based DFPQ adjusts the deficit counter of rtPS based on the current queue length...
IEEE 802.16e standard specifies a system for combined fixed and mobile broadband wireless access. The voice-over-Internet protocol (VoIP) is an important application in IEEE 802.16e system. The algorithm proposed allocates the extra-bandwidth according to the flow's priority, the lagging flow is compensated according to the service it has lost, and the leading flow relinquish bandwidth proportional...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.