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Worldwide Interoperability for Microwave Access applications and QoS specifications are based upon class based schemes. These service classes effect to QoS for user fairness and system utilization. Improved MAX C/I algorithm considers user waiting time and channel to interference ratio but not class based scheduling schemes, after including this neglecting condition algorithm solves the problem of...
LTE and WiMAX are the most important radio access technologies in the fourth generation mobile networks providing broadband access. The technologies bring strong QoS support, especially for multimedia services such as real-time video streaming, requiring bounded packet loss rate and delay. To reach these goals, effective packet scheduling schemes are needed to allocate radio resources. The function...
WiMAX refers to Wireless Interoperable implementations of the IEEE 802.16 standards ratified by the WiMAX Forum has a main goal to deliver wireless communications with quality of service in a secured environment. The WiMAX MAC layer is designed to support different types of applications and services having different Quality of service (QoS) requirements. In addition of providing higher throughput...
In this paper, we propose a new scheduling algorithm for IEEE802.16 Broadband wireless Metropolitan Area Networks in TDD mode. Based on some known algorithms such as Modified Deficit Round Robin (MDRR), Proportional Fairness (PF) and Adaptive Proportional Fairness (APF), we have studied the scheduling problem and proposed scheduling algorithm, called (Enhanced-APF) for focuses on an efficient mechanism...
WiMAX is a radio technology for transmitting data at high speed. The challenge for these networks is to ensure the Quality of Service (QoS) for different types of applications having different characteristics and requirements. Among these applications we note the telemedicine; where communication and information technology is used to help improving human life especially in regard to health. Medical...
This paper proposes a scheduling approach for mobile uplink WiMAX system that provides a trade-off between delay requirement satisfaction and throughput maximization. The paper starts by introducing three scheduling algorithms each with a different objective. The first aim is to maximize the throughput of the system, while maintaining the user fairness. The second aim is to satisfy the delay requirements...
Worldwide Interoperability for Microwave Access (WiMAX) is a broadband wireless access (BWA) technology. It provides high data rate and multimedia service. It also supports Quality of Service (QoS) for various types of application. In this network, it is important to allocate appropriate resource to different class of service to guarantee the delay of real-time service and avoid the starvation of...
IEEE 802.16e based WIMAX is a promising technology for broadband wireless access (BWA) because of its high scalability, large coverage area, high data rates and low cost of system deployment. Unlike wireless Local Area Networks (LANs), WIMAX network supports Quality of Service (QoS) to different types of network traffic and has introduced several mechanisms at Medium Access Control (MAC) layer to...
In our earlier work, we described an optimization problem and corresponding scheduling algorithm aimed at obtaining maximum throughput guarantees in wireless networks. To further improve the short-term performance, we also proposed two adaptive versions of the optimal algorithm. Results from the simulations showed that the adaptive algorithms perform significantly better than other well-known scheduling...
In this paper, we study the performance of some of the key scheduling algorithms such as Proportional Fair Scheduler, Modified Longest Weighted Delay First and Exponential Rule. We also propose a new algorithm called EXPQW, a variant of the Exponential rule which assigns weights to the subscriber stations based on their queue length and waiting time thereby ensuring fairness and quality of service...
The ability to support quality of service (QoS) for a wide range of applications that exhibit different service requirements is a major competency of IEEE 802.16 networks. One of the keys to QoS provision is a scheduling algorithm that is able to determine the service ordering for packets from different service classes. This however is undefined in the standard to promote innovation by equipment vendors...
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 IEEE 802.16 standard, defining the Worldwide Interoperability for Microwave Access (WiMAX) for Metropolitan Area Network (MAN). The IEEE 802.16 standard, includes specification for the Medium Access Control (MAC) and Physical (PHY) layers, is designed to serve all kinds of traffic. The standard is equipped with signaling and bandwidth allocation algorithms that can accommodate many connections...
This paper presents the key design factors that must be taken into account when developing resource allocation algorithms. IEEE 802.16e standard does not include a scheduling algorithm for the uplink direction and it remains open for research and continuous improvement. Using OPNET, we investigate different factors that impact the UL resource allocation in WIMAX. Based on one of our previous papers...
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...
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