Congestion-driven Topology Control in Wireless Ad Hoc Networks

International audienceThe increasing popularity of wireless local area networks proves current trends in telecommunication industry with notably a growing need for flexibility and ubiquitous wireless connectivity. The introduction of quality of service (QoS) in these networks is even more complex since their topology and their resources evolve dynamically. With this fast evolution, performances and connectivity of wireless networks radio decreases. In this paper, we propose an approach to control the topology of wireless networks based on continuous QoS metrics performances measurements in 802.11 networks. This consists in ensuring the highest connectivity possible by dynamically selecting a set of dedicated mobile routers to ultimately increase the performance of infrastructure-less wireless ad hoc networks. In order to confine the network overload probability, our scheme features a forced handover technique along with a connection admission control (CAC). Finally, we introduce a QoS scheme to manage heterogeneous traffic requirements by allowing for different traffic priorities

The potential of transmit data rate control for channel congestion mitigation in VANET

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Congestion-driven Topology Control in Wireless Ad Hoc Networks

International audienceThe increasing popularity of wireless local area networks proves current trends in telecommunication industry with notably a growing need for flexibility and ubiquitous wireless connectivity. The introduction of quality of service (QoS) in these networks is even more complex since their topology and their resources evolve dynamically. With this fast evolution, performances and connectivity of wireless networks radio decreases. In this paper, we propose an approach to control the topology of wireless networks based on continuous QoS metrics performances measurements in 802.11 networks. This consists in ensuring the highest connectivity possible by dynamically selecting a set of dedicated mobile routers to ultimately increase the performance of infrastructure-less wireless ad hoc networks. In order to confine the network overload probability, our scheme features a forced handover technique along with a connection admission control (CAC). Finally, we introduce a QoS scheme to manage heterogeneous traffic requirements by allowing for different traffic priorities

Multi-Granularity Graph Model (MGGM)

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Dynamic Path Adaptation Through Network Tomography

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Connection Admission Control and Comparison of Two Differentiated Ressources Allocation Schemes in a Low Earth Orbit LEO Satellite Constellation

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Connection admission Control CAC for a Mixed Burst/Packet Service Based on Service Differentiation in a Low Earth Orbit LEO Satellite Constellation

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A Movable Boundary Approach for Serving Bursts on the Up/Down Link in a Low Earth Orbit Satellite Constellation

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Toward a Seamless Mobility Management in Next Generation Networks

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DCC-enabled contention based forwarding scheme for VANETs

International audienceAlthough IEEE 802.11p technology is standardized for road safety and efficiency applications, the channel congestion problem is its key weakness necessitating distributed congestion control (DCC) algorithms on different layers of the communication stack. In this paper, we propose DCC-enabled Contention based Forwarding scheme targeting multi-hop dissemination of Decentralised Event Notification Messages (DENMs). The proposed scheme adapts the parameters of the ETSI standardised forwarding scheme, contention based forwarding (CBF), by taking account the channel load condition. Simulation evaluations are carried out to investigate the performances of the proposed scheme targeting a highway scenario and considering that the wireless channel is shared by DENMs and Cooperative Awareness Messages (CAMs), which are periodically broadcasted by individual vehicles. In the simulations, a dual DCC, the facilities layer DCC, which controls CAM generation rates, and the networking layer DCC, CBF2C, which targets DENMs, are applied and evaluated. Simulation results clearly show that DCC on CAM has a significant impact on communication performances of both the DENM and CAM messages. DCC on networking layer further improves performances in terms of packet delivery ratio (PDR), delay, and communication overhead