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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...
This paper presents results from a novel OFDMA multi-cell mobile broadband system level simulator. The tool is used to statistically characterize uplink and downlink inter-cell interference. Without suitable interference management, multi-billion dollar networks can collapse under the strain of heavy traffic loads. Fully loaded interference studies cannot be performed on the network until it has been...
This paper proposes a new scheduling algorithm for IEEE 802.16-2005 Broadband Wireless Metropolitan Area Networks in TDD mode. The proposed algorithm focuses on solving the problem of handling high priority traffic in congested networks while minimizing starvation conditions for other served classes. In this work, a detailed simulation study is carried out for the proposed scheduling algorithm as...
The emergence of WiMAX has attracted significant interests from all fields of wireless communications. WiMAX has been tipped to bring a revolution in the way where broadband services have been used today; those have been strengthened by the optimization of RF. The systematic investigation to establish facts of necessary modification about the theory for smooth optimization is targeted. This paper...
Video streaming for IPTV is transferring to wireless mobile devices. This process poses questions of the video quality that will result and the suitability of the existing pseudo-streaming schemes for video transfer. This paper sets out the case for wireless broadband video streaming based on a simple negative acknowledgment (NACK) scheme, which for convenience is called broadband video streaming...
In this paper, we present our approach of establishing a Mobile WiMAX test bed as a part of our collaborations with the Federal Railroad Administration (FRA) for studying the performance of current and upcoming broadband wireless technologies in a railroad environment. The focus is on studying the impact of mobility on the wireless system throughput for moving trains at high velocities. We describe...
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...
This paper presents findings from a study which investigated WiMAX Quality of Service (QoS) as experienced by the end users. The research was conducted in Tanzania, a developing country in East Africa, testing a commercially available WiMAX broadband service. The researchers conducted technical evaluations by testing throughput, packet losses, delay and link stability. They also investigated non-technical...
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...
WiMAX systems are beginning to spread as a wide-area wireless access technology that provides QoS support for future multimedia applications. Vendors have started to ship off-the-shelf hardware that addresses the market of broadband Internet coverage in sparsely populated areas. Facing a potentially large deployment of 802.16-based end-system connectivity, it is of vital interest to experimentally...
WiMAX (IEEE 802.16) has emerged as a promising radio access technology for providing high speed broadband connectivity to subscribers over large geographic regions. New enhancements allow deployments of relay stations (RSs) that can extend the coverage of the base station (BS), increase cell capacity, or both. In this paper, we focus on deploying RSs for the purpose of coverage extension. We propose...
The IEEE 802.16/WiMAX mesh standard is a promising technology to support next generation wireless broadband metropolitan area networks. The medium access control (MAC) layer of IEEE 802.16 mesh supports both centralized and distributed scheduling mechanisms. The coordinated distributed scheduling mechanism uses a pseudo-random election algorithm to determine the transmission times of the nodes. The...
IEEE 802.16 standard was designed to support the bandwidth demanding applications with quality of service (QoS). Bandwidth is reserved for each application to ensure the QoS. For variable bit rate (VBR) applications, however, it is difficult for the subscriber stations (SSs) to predict the amount of incoming data. To ensure the QoS guaranteed services, the SS may reserve bandwidth more than the amount...
Employing multiple TFRC connections has emerged as a promising lightweight way of coping with wireless channel losses in a congestion-controlled tandem network. This work extends multiple TFRC connection streaming to broadband uplink streaming. This study differs from earlier work for a number of reasons: it reports on a specific wireless technology, IEEE 802.16 (WiMAX); it considers the impact on...
WiMAX is the latest technology that has promised to offer broadband wireless access over long distance. The throughput of wireless communication such as WIMAX depends on number of parameters. These parameters include: packet size, transmission rate, signal to noise ratio, modulation techniques and channel conditions. All these variables are discussed using simulation, certain graphs have obtain optimum...
As one of the effective way to overcome the digital divide issue in the lightly populated area, the BWA (Broadband Wireless Access) system is expected and field trials have been conducted extensively in Japan. This paper introduces the results of BWA field experiments conducted in a typical intermediate and mountainous area in Japan. In the BWA network, WiMAX units are used as relay stations and R-LAN...
Mobile WiMAX has been introduced for next generation broadband wireless access systems, and it has been designed to provide various multimedia services through highspeed wireless Internet access. However, since IEEE 802.16e standard, international standard of mobile WiMAX, defined only hard handover as mendatory, Mobile Station (MS) cannot transmit or receive packets during handover procedure. Thus...
IEEE 802.16 based wireless access scheme (commonly known as WiMAX) is considered as one of the most promising wireless broadband access schemes for communication networks in metropolitan areas today. One of the most challenging tasks in the access scheme is the need to support quality of service (QoS). The paper proposes a priority based bandwidth allocation mechanism in WiMAX networks which is compliant...
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...
Wireless network operators often offer wireless broadband services by using different wireless technologies such as WiMAX, WiFi and HSPA. Each wireless technology often uses a separate and stand alone network architecture, and thus operations and management may easily become a complex and expensive task. In this paper we present the design and implementation of an all-IP heterogeneous network where...
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