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Recent developments on the wireless communication technology have brought much innovativeness to make wireless access networks, e.g. WiMAX systems, to be able to compete with the wired access networks with much more bandwidth. QoS service provisioning is an important issue for deploying such networks. The IEEE 802.16d standard has specified the services should be provided at the medium access control...
With the development of the Grid computing, increased attention is paid to services and user personalization. How to search and schedule the most suitable service for an end user direct affects the popularization use of service oriented Grid. Inspired from the mode of web search engine, such as Yahoo, Google, this paper proposes an innovative service searching and scheduling algorithm (SPSE: Service...
QoS provisioning in wireless mesh networks has been to known as a challenging issue. In a distributed scheduling based wireless mesh backhaul network, conventional connection-based QoS provision mechanism requires considerable amount of overhead for per-link QoS signaling, thus cannot support high speed real time traffic. In this paper,we propose a DiffServ-like QoS provision mechanism for IEEE 802...
In this paper, the problem of the multi-user uplink scheduling in cognitive radio cellular network (CogCell) is investigated. The objective is to maximize the system throughput, while protecting the QoS of primary user (PU) from being affected by secondary user (SU). Here, PU's QoS is represented by its signal-to-interference-plus-noise (SINR) outage probability. It is equivalent to say that SU can...
Quality of service (QoS) differentiation is one of the keys to success for WiMAX (Worldwide Interoperability for Microwave Access) networks. Although the IEEE 802.16 standard issued some guidelines to design a QoS architecture, for the most part implementation details are left to manufacturers. Focus in this paper is on channel-aware scheduling policies to be implemented in the WiMAX Base Station...
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...
This paper evaluates the performance of two simple packet scheduling algorithms for real-time traffic in the third generation partnership project long term evolution (3GPP LTE) system. These algorithms, known as Algorithm 1 and Algorithm 2 for this paper, were proposed to support real-time traffic in orthogonal frequency division multiple access (OFDMA) system. Simulation results show that Algorithm...
Based on the analysis of demands of Internet Protocol Television(IPTV)access network and advantages of WiMAX technology, a system model for IPTV over WiMAX is proposed and the system procedure is analysed in detail. Considering the heavy traffic in downlink direction of IPTV service, this paper proposes a Downlink Real-time Scheduling(DLRTS) algorithm which aims at decreasing the delay of real-time...
Virtual machines offer unique advantages to the scientific computing community, such as Quality of Service(QoS) guarantee, performance isolation, easy resource management, and the on-demand deployment of computing environments. Using virtual machines as a computing resource within a distributed environment, such as Service Oriented Architecture (SOA), creates a variety of new issues and challenges...
The proxy is one of the important parts of the Internet. The proxy can reduce the data flow and release the load of the servers. Because of the unpredictable problem of the network, the proxies have great influence on the video QoS. Through the perfect algorithm, within the acceptable scope, the proxy can improve the performance of the system. In the video service system, the proxy can improve the...
Nowadays, most of the computerized network applications are depending on the ability of the servicing packet switching network to integrate different types of traffic from two main categories, real-time and best-effort classes, and provide different QoS guarantees based on the traffic type. Different methods were applied to provide such guarantees, one of the most efficient method used in packet switching...
In Mobile WiMAX system, it is important to allocate resources appropriately in order to the efficient utilization of resources among a variety of real-time and non real-time services. Although a lot of the real-time and non real-time packet scheduling schemes in OFDMA system have been proposed, it need to be modified to apply to Mobile WiMAX system. Since Mobile WiMAX supports five kinds of service...
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...
We study scheduling unit-length packets with soft deadlines. In our setting, packets arrive over time and a packet may have different values contributed to the objective when it is delivered at different time. In one time step, at most one packet is allowed to be sent. Our goal is to maximize the total value achieved by delivering packets. Based on various application requirements, we propose two...
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 Working Group on Broadband Wireless Access is developing the standard for broadband wireless access networks in Metropolitan Area Network (MAN), also know as WiMAX. One of the features of the 802.16 MAC layer is that it is designed to differentiate service among traffic categories with different multimedia requirements. Based on these assumptions and considering that the standard does...
This paper studies the problem of congestion control and scheduling in ad hoc wireless networks that have to support a mixture of best-effort and real-time traffic. Optimization and stochastic network theory have been successful in designing architectures for fair resource allocation to meet long-term throughput demands. However, to the best of our knowledge, strict packet delay deadlines were not...
IEEE802.16 is a promising wireless broadband technology for the next generation last mile access. Though Quality of service (QoS) is guaranteed by the standard which defines five types of multimedia traffic classes, it doesn't define any specific admission control strategy and scheduling algorithm which are left to venders to design, and they have been becoming the research hotspot and many manufacturers,...
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