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The following topics are dealt with: wireless communications and networking WCN/WLAN/WiMAX; optical communications and networking OCN; mobile communications/wireless/mobility; mobile ad-hoc and sensor mesh networks; network management and services; UWD/RFID/OFDM and Nano/Bio, and; quality of service, traffic management and dynamic spectrum access networks.
Femtocells are an inexpensive solution to address weak indoor cellular coverage. Femtocells increase network coverage, offloaded macro cell sites, and provide high data rate services in a cost-effective manner. However, several aspects of this new technology are ambiguous or not defined in standard, such as QoS architecture, bandwidth request management and subscribers flows priority. This paper provides...
Video traffic over cellular and broadband wireless access networks has been rapidly increasing in the recent years. To ameliorate the effect of this increase at wireless bottleneck links, we design and implement the first farsighted flow management framework, called MESA. During periods of network overload, MESA attempts to maximize the long-term quality of experience for each user. MESA has three...
Mobile WiMAX's scheduling service is a key factor in Radio Resource Management (RRM) in realizing Quality of Service (QoS). The choice in scheduling algorithm for Mobile WiMAX base stations, albeit outside of the scope of the standard, critically impacts the performance and robustness of Mobile WiMAX networks. This paper provides an in-depth study of four major scheduling algorithms: Round Robin (RR),...
The primary concern of broadband wireless technologies is to provide the end-to-end Quality of Service (QoS) for integrated real-time and non real-time applications. The main focus of the IEEE 802.16d/e MAC layer is to manage the radio recourse in an efficient way. The basic functional blocks of the QoS model are addressed by the standards to support five different types of service classes. However,...
Due to the AMC (Adaptive Modulation and Coding) mechanism adopted in the 802.16e physical layer, each connection's spectrum requirements depend on its SNR (Signal-to-Noise Ratio). Meanwhile, according to the OFDMA functionality, the limited transmission power of every terminal is divided among the simultaneously allocated subcarriers, i.e. a terminal's uplink SNR is reversely proportional to the number...
Worldwide interoperability for Microwave Access (WiMAX) networks are being deployed to offer Broadband (BB) wireless access to mobile users. One of the important aspects of current and upcoming wireless networks is handover management. In this paper we presented a new comprehensive mechanism for Handover (HO) in WiMAX wireless cellular network. Already existing mechanism for xG (2G, 2.5G, 2.75G, and...
In this paper the effectiveness of the networking existing data links to provide a robust and resilient network for the first responder's application is analysed. Methodology and an algorithm that can assist the internetworking different standards are presented. A cross standard scenario is simulated and results are explained.
Network selection is one of the key issues in heterogeneous wireless networks. However, very few efforts have been made on both algorithm and management of network selection to satisfy the individual requirements of every single user, so as to attract customers in the future user centric business mode. This paper takes the following steps toward addressing this problem: 1) a novel user preference...
The next generation of wireless systems (NGWS) will allow the integration of multiple radio access technologies (RATs). This integration will enable that much functionalities that were specific to each RAT to be jointly processed, increasing the cooperation degree. This work focuses on radio resource management (RRM) for NGWS, where a new RRM architecture is introduced. In this architecture, the RRM...
Today's framework for radio spectrum regulation and spectrum usage is undergoing fundamental changes. In the face of scarce radio resources, regulators, industry, and the research community are initiating promising approaches towards a more flexible spectrum usage, as for example cognitive radios for dynamic spectrum assignment. In this work an intelligent algorithms is presented which supports operation...
Network Selection mechanisms play an important role in ensuring quality of service for users in a multi-network environment. These mechanisms handle the selection of an optimal wireless network to satisfy a user request. This paper proposes a radio resource management framework for integrated network selection mechanism control in multi- network environment as an interaction game between the service...
The following topics are dealt with: wireless sensor network; MIMO; RFID network; radio resource management; cognitive radio; quality of service; coding; modulation; equalization; mobile ad hoc network; hybrid network communication; WiMAX; distributed radio theory; and wireless access technique.
Next generation mobile radio networks of IMT Advanced systems family will offer ubiquitous broadband high area coverage, at up to 1 GBit/s in cities and 100 MBit/s in rural areas and QoS support in terms of throughput and low delay. Candidate technologies like 3GPP-LTE, WiMAX, as well as the WINNER system design are based on OFDMA transmission for flexible radio resource allocation, scalable and adaptable...
Frequency is amongst the most exclusive and most costly resources in wireless communication networks, especially, while considering the demands of broadband wireless access (BWA). In BWA, the management of frequency distribution and its effective utilization is of utmost importance. This research explores possible ways to ensure the most effective allocation of bandwidth resources and their best possible...
Employing multiple radio access technologies such as WiMAX, HSDPA and Wi-Fi in a mobile network to provide users with more cost-effective communication services has long been a vision of many service network providers. In this paper, we propose a novel user-decided service model for a cooperative wireless network in which the radio resources of multiple wireless networks are collectively managed....
Explosive development of multimedia services in actual data networks and the increasing demand for service quality stimulate the interest in the QoS management research. In order to ensure the service quality for multimedia flows crossing heterogeneous domains several resource management entities should cooperate to fulfill this task. In this paper we will present a QoS management system for WiMAX...
This paper presents the validation of an end-to-end QoS integrated management system in a multidomain test-bed environment. The integrated management system was designed and implemented in the framework of the ENTHRONE European project. This paper focuses on the network service management validation at both the Service Provide and Network Provider The Network Service Management is based the SLS management:...
Multimedia flows transport over multiple IP domains requires quality of services (QoS) guarantees. In multi-domain contexts, the end-to-end QoS assurance needs cooperation of several resource management entities. Cooperation of the domains but also preservation of each domainpsilas autonomy are both required. This paper presents results on functional validation of a multiple domain overlay-developed...
This paper presents the architecture, design, implementation and samples of tests performed on a testbed for IEEE 802.16/WiMax access technology while used in a multi-domain environment IP networks. The final target was to implement a system capable to offer connectivity services, with different levels of end to end QoS guarantees, adaptable to different applications. Flexible solutions are proposed...
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