A Queuing Theoretic Scheme for a QoS-Enabled 4G Wireless Access

There will be heterogeneous wireless access networks in 4G systems, e.g., WLAN, UTRAN etc. The networks will need to support QoS provisioning and full mobility. For each connection request by a mobile user in such networks, there will be need for a scheme for selecting the best network from among the available networks. The research proposes a scheme that selects the best network based on the user_s QoS requirements. The scheme models each radio access network as a network of queuing nodes. This model then uses the network state (e.g. traffic arrival and service rates) to compute the end-to-end QoS parameter statistics (e.g., delay and throughput) of user traffic flow through each available network. We postulate that the statistics indicate the QoS capabilities of the network and can therefore be used to select the best network to serve the mobile user

A QoS enabling queuing scheme for Fourth Generation wireless access networks

Word processed copy.Includes bibliographical references (leaves 70-74).This research proposes a scheme to accomplish the task of network selection; this is achieved by enhancing existing QoS provisioning approaches. The scheme models the radio access network as a network of queuing nodes. With the model, the link layer QoS statistics of user traffic in each available path through the network is determined. The author postulates that the statistics indicate the QoS capabilities of the network and can therefore be used to select the best network to serve the mobile user

Intégration et gestion de mobilité de bout en bout dans les réseaux mobiles de prochaine génération

Résumé - Pendant les dix dernières années, l'utilisation des systèmes de communication sans fil est devenue de plus en plus populaire tant chez les entreprises que chez les particuliers. Cette nouvelle tendance du marché est due, en grande partie, à la performance grandissante des réseaux mobiles qui concurrencent davantage les réseaux filaires en termes de bande passante, de coût et de couverture. Toutefois, cette catégorie de solutions sans fil est conçue pour des services spécifiques et utilise des technologies très variées. De plus, les usagers sont de plus en plus mobiles et requièrent des applications sensibles au délai (voix, multimédia, etc.). Dans ce nouveau contexte de mobilité, la prochaine génération des réseaux sans fil (4G) s'annonce comme l'ultime solution visant à satisfaire les exigences des usagers tout en tirant profit de la complémentarité des services offerts par les systèmes mobiles existants. Pour ce faire, la principale vocation de la future génération (4G) consiste en l'intégration et la convergence des technologies sans fil existantes et celles à venir. Cette intégration passe obligatoirement par l'utilisation du protocole IP (Internet Protocol) qui permet de cacher l'hétérogénéité des systèmes intégrés puisqu'il demeure l'unique couche commune à toutes les plateformes mobiles. Plusieurs solutions d'intégration ont été proposées dans la littérature. Celles-ci concernent des architectures d'intégration et des mécanismes de gestion de mobilité. Cependant, les approches proposées ne font pas l'unanimité et souffrent de plusieurs handicaps liés, en particulier, à l'interopérabilité et la garantie des relèves sans coupures.----------ABSTRACT During the last few years, the use of wireless systems is becoming more and more popular. This tendency can be explained by the fact that mobile technologies are gaining in performance in terms of bandwidth, coverage and cost compared to the traditional wired solutions. However, each mobile network is tailored for a specific type of services and users. Moreover, end users are expected to become more and more mobile and show an increasing interest to real-time applications. In these circumstances, the next generation of mobile networks (4G) appears to be the ultimate solution that will satisfy mobile user demands and take benefit of the existing wireless systems. Indeed, the future generation consists of integrating, in an intelligent manner, the existing/future wireless systems in a way that users can obtain their services via the best available network. This integration passes through the use of the Internet Protocol (IP) that will hide the heterogeneity pertaining to the integrated networks. To deal with this very important task, several solutions are available in the literature. The proposed approaches cover some basic topics such as interworking architecture and mobility management. Nevertheless, these proposals suffer from drawbacks relevant to the guarantee of QoS through heterogeneous technologies

The SMART project: Exploiting the Heterogeneous Mobile World

The wide proliferation of wireless systems and the use of software radio technologies enables the employment of a heterogeneous network. In this concept services are delivered via the network that is most efficient for that service. Our solution is based on a common core network that interconnects access points of various wireless access points. A mobile host can apply multiple different access networks simultaneously to increase capacity or efficiency. Furthermore, a basic access network, separated from other wireless access networks, is used as a means for wireless system discovery, signaling and paging. Quality of Service is of prominent importance due to the heterogeneous environment and the characteristics of the wireless channel. This paper describes the concepts of our architecture, and presents an overview of the architecture