Active Signaling for 802.11 Networks in the ns-3 Simulator

International audienceIn wireless networks, wireless channels are often shared between multiple nodes, which may interfere when they transmit simultaneously. The media access control (MAC) scheme coordinates channel access between the different nodes. In this article, we focus one specific method of channel access, Elimination-Yield Non-Preemptive Priority Multiple Access, EY- NPMA, which is part of the European standard wireless HIPERLAN. EY-NPMA is a wireless MAC method that partly relies on "active signaling": i.e. transmitting (activity) to simply signal a node's presence (with pseudo-noise), rather than transmitting data (bits). In this article, we study the adaptation of EY-NPMA named Ey-Wifi as an extension of the 802.11-based standards. Our main focus is the implementation of a such an extension in a module of the network simulator, ns-3, with the emphasis on the software architecture

Ey-Wifi: Active Signaling for the ns-3 802.11 Model

In wireless networks, wireless channels are often shared between multiple nodes, which may interfere when they transmit simultaneously. The media access control (MAC) scheme coordinates channel access between the different nodes. In this article, we focus one specific method of channel access, Elimination-Yield Non-Preemptive Priority Multiple Access, EY-NPMA, which is part of the European standard wireless HIPERLAN. EY-NPMA is a wireless MAC method that partly relies on "active signaling": i.e. transmitting (activity) to simply signal a node's presence (with pseudo-noise), rather than transmitting data (bits). In this article, we focus on the implementation of EY-NPMA channel access scheme as a module in the ns-3 network simulator. We are interested particularly to study the adaptation of the ns-3 Wifi module to support EY-NPMA features. Hence, our main focus in this work is the implementation of a such an extension, yielding Ey-Wifi, in a module of the network simulator, ns-3, with the emphasis on the software architecture. We are interested further to present some simulation results, analyzing the performance of both Wifi and Ey-Wifi.Dans les réseaux sans fil, le canal est partagé par plusieurs noeuds, qui peuvent interférer s'ils transmettent simultanément. Un mécanisme d'accès au canal (MAC) cherche à bien gérer l'accès au canal entre les différents noeuds. Dans ce rapport, nous nous intéressons à une méthode spécifique d'accès au canal; EY-NPMA (Elimination-Yield Non-Preemptive Priority Multiple Access) qui correspond à la méthode d'accès du standard européen Hiperlan 1. EYNPMA est une méthode d'accès basé sur le signalement actif. En effet, le noeud signale sa présence en envoyant un burst sur le canal. Celui qui a le plus long burst accède au canal et envoit ses données. Nous nous intéressons particulièrement à l'adaptation du module Wifi du simultaeur ns3 pour supporter les caractéristiques de EY-NPMA. Nous nous intéressons aussi à l'évaluation de cette méthode d'accès EY-NPMA. Nous présentons ainsi les résultats de simulations iluustrant les performances des deux méthodes d'accès

Scientific Experiments with the Large Scale Open Testbed FIT IoT-LAB: Broadcast with Network Coding

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Prioritized network coding scheme for multi-layer video streaming

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Bounded Network Coding Redundancy for Multi-Layer Video Streaming

International audienceIn this paper, we address the tradeoff between network coding overhead and multi-layer video tolerated loss rate on multi-hop wireless networks. We aim, through a simulation study, to evaluate a bounded network coding redundancy, for scalable video, based on the measured packet loss and the targeted maximum application loss rate. We consider, first, applying the bounded redundancy on a generation based scheme, and evaluate the tradeoff between tolerated video loss and the introduced overhead. Second, since scalable video produces a high video quality with various levels of importance, we propose to apply the bounded redundancy to an Expanding Window based scheme. We carried out a performance evaluation of both network coding schemes with two video test sequences using ns-3 simulator. We show the benefits of our scheme particularly in terms of overhead and PSNR