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In the Cloud Computing Context, a virtual Machine (VM) can be migrated from one physical host to a remote physical host while keeping it's address to avoid service discontinuity. The service application is so no more hosted on a particular physical machine but can move from one to other. We define therefore a new mobility context where the services provided by VMs move from one location to another...
Fourth generation (4G) Network integrates existing wireless technologies (GPRS/UMTS, WiMAX, WLAN, etc.) and offers access to services while on the move, at any place and any time. A multi-interface device can switch connection among available access points implementing different technologies. Integration of heterogeneous wireless networks can be performed at different levels (open coupling and tight...
Cloud computing known as an IT environment that includes all elements of the IT and network stack, enabling the development, delivery, and consumption of Cloud Services. In this paper we present Some SOA frameworks which could be used in our proposition. We introduce a concept of multi-tenancy. We studied it with some works in this area which combined SOA, multi-tenancy and cloud. We are interested...
Mobile Ad hoc Networks (MANET) are wireless networks consisting of a collection of mobile nodes with no fixed infrastructure. Energy is a limiting factor in the successful deployment of ad hoc networks since nodes are expected to have little potential for recharging their batteries. Communication in ad hoc networks necessarily drains the batteries of the participating nodes, and eventually results...
Cross-layer design is becoming a popular design methodology for the IP-based next-generation wireless systems 3G/4G. Several cross-layer methods are emerging to enhance the performance of the applications and achieve better Quality of Service (QoS) support. Through these methods, the refined wireless systems are expected to gain significant performance improvement and obtain extended functionality...
The demand for accessing services while on the move, at any place and time, has lead to the current efforts towards integration of heterogeneous wireless networks, in particular UMTS, WiMAX and WLAN, as complementary systems. Integration can be performed at different levels: tight coupling and loose coupling. The paper presents the design and evaluation of a HMIPv6 based architecture for different...
In this paper we propose a three steps admission control Method for cognitive radio based on UWB (Ultra Wide Band) control transmission. Two algorithms have to be applied during this control Admission procedure the ACCA (Admission Control for Cognitive Association) and the ACAR (Admission control based on Available Resources). To enhance the efficiency of the Admission control Method a multi — association...
The Cognitive Radio (CR) is a recent technology that aims at increasing the spectrum utilization under the current static spectrum management. With appropriate CR MAC protocols, the unlicensed users, also called secondary users (SUs), are able to access the unused portion of spectrum in an opportunistic way. These protocols should also provide a coordinated access between the SUs and protect the licensed...
Semantic Web Services is an emerging technology that promises to enable dynamic, execution-time discovery, composition, and invocation of Web Services. Semantic matchmaking plays a vital role in the automated and dynamic discovery process of Semantic Web Services and consists in measuring the semantic distance between a requested service and an advertised one. In this paper, an innovative approach...
A wireless ad-hoc network is an autonomous system of wireless routers, fixed or mobile those communicate with each other via radio links without the support of any fixed wired infrastructure. In such a topology, communication is achieved by use of multiple hop paths between the sender and the receiver. Wireless ad-hoc networks constitute a typical paradigm of networks whose performance and operability...
The Next Generation Internet is intended to be an IP/WDM network which can be optimized using virtual topology based traffic engineering. In this paper we study the NP-hard Virtual Topology Design (VTD) problem for which we propose a MILP (Mixed Integer Linear Program) formulation with a tradeoff object between saving resources and minimum delay traffic handling. To solve it for large scale backbone...
In this paper, we investigate a channel selection algorithm based on temporal characterization of spectrum holes. This algorithm is conceived to be implemented within a decentralized Radio Resources Management operation where decision making processes are executed at the mobile terminal side. Different scenarios are considered to test the effectiveness of this algorithm in improving the spectrum efficiency.
In outdoor wireless communication networks such as mobile WiMAX (802.16e), mobile stations move all the time, thus they need to be handed off to different base stations based on certain criteria. In this paper, a fuzzy logic based scheme for fast selection of best base station and of handover technique at the handover time is presented in order to minimize the delay during handover for sensitive multimedia...
In this paper, we propose a new dynamic frequency assignment scheme for femtoCells in OFDMA networks. The femtoCell base stations are small cellular base stations specially designed to improve the poor indoor coverage and increase the system capacity for cellular and wireless broadband networks. However, these femto-base stations cause harmful interference to the macroCells. Therefore, the optimization...
The users wish to communicate through collections of networks using different protocols, rendering service mapping from one network to another with the similar QoS is a complex issue thereby. The heterogeneous networks are collections of communication platforms using different protocols. This heterogeneity implies the need to offer many different services on the market within short time. With the...
The interest for providing services with performance guarantees across different connected networks has given new technical solutions allowing the computation of constrained inter-domain paths. Thus, the present paper treats the problem of computing inter-domain paths subject to multiple constraints. We study here existing algorithms for inter-domain computations, and describe new approach approximating...
As the number of services and users in Internet Protocol Multimedia Subsystem (IMS) keeps increasing, network virtualization seems to be a good alternative for Mobile Virtual Network Operators(MVNOs) in order to provide better services to customers and save cost and time. As a matter of fact, it offers better performances in terms of resource management and automatic allocation. Furthermore, when...
In this paper, we propose a pricing model for variable bandwidth demand services, combined by an optimized resources allocation strategy in an OFDMA based WiMAX systems. The users satisfaction level and the operator revenue are the two keys for the pricing scheme we propose. The relationship with the channels allocation is investigated and a two step based allocation method is proposed using linear...
Most of enterprises rely on the outbound call centers which play a very important role in Customer Relationship Management (CRM) and marketing. Outbound Calls centers that employ predictive dialing system obtain greater productivity and higher service levels by dynamically generating outbound traffic. An algorithm is proposed to provide a trade-off between outbound dialing rate and agent occupation...
In the idea to create a realistic model of mobility and traffic for the networks of 3rd and 4th generation, we have studied many techniques of modeling and planning. Our choice was for the real network traces exploitation techniques, mainly because compared to other techniques this technique is very adapted to the real modeling. Although this technique is most convenient, it has many disadvantages...
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