164documents trouvés
An uplink bandwidth management framework for IEEE 802.16 with QoS guarantees
M.EL MASRI, S.ABDELLATIF, G.JUANOLE
OLC
Manifestation avec acte : Networking 2009, Aachen (Allemagne), 11-15 Mai 2009, 12p. , N° 09231
Lien : http://hal.archives-ouvertes.fr/hal-00389545/fr/
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Abstract
This paper presents a novel uplink bandwidth management framework for IEEE 802.16 WiMAX. This framework is destined to be used in a scenario where a large number of connections are simultane- ously active, as may be the case when WiMAX is used as a backhaul for WiFi hotspots. In such a scenario we propose a simple and efficient scheduling discipline for the WiMAX uplink traffic. We also propose an admission control algorithm and a modification of the complex band- width request mechanisms. The framework we propose in this paper was analyzed: simulation results show a significant performance improvement in terms of overall throughput and delay when compared to recently pub- lished work.
Gateway selection in backbone wireless mesh networks
U.ASHRAF, S.ABDELLATIF, G.JUANOLE
OLC
Manifestation avec acte : IEEE Wireless Communications & Networking Conference (WVNC 2009), Budapest (Hongrie), 5-8 Avril 2009, 6p. , N° 08717
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Mots-Clés / Keywords
Backbone mesh networks; Gateway selection; Route selection; 802.11s; Airtime metric;
Classification de protocoles MAC multi-canaux dans les réseaux locaux sans fil maillés
A.EL FATNI, T.VAL, G.JUANOLE
LATTIS, Toulouse, OLC
Manifestation avec acte : Journées Doctorales en Informatique er réseaux (JDIR'09), Belfort (France), 2-4 Février 2009, 7p. , N° 09053
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Mots-Clés / Keywords
Réseaux sans fil maillés; MAC multi-canaux; Qualité de Service (QdS);
Stable routing in wireless mesh networks
U.ASHRAF, S.ABDELLATIF, G.JUANOLE
OLC
Rapport LAAS N°08718, Janvier 2009, 20p.
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Mots-Clés / Keywords
Route stability; Wireless mesh networks; Congestion; Reactive routing protocols;
Fault detection and reconfiguration in networked control systems: on the interest of a dynamic component in the message scheduling technique
G.JUANOLE, D.SAUTER, C.CALMETTES
OLC, CRAN-ENSEM, CUFR
Rapport LAAS N°08688, Janvier 2009, 6p.
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Mots-Clés / Keywords
Fault detection; Network; Fieldbuses; Networked control systems; Simulation;
Route stability in wireless mesh access networks
U.ASHRAF, S.ABDELLATIF, G.JUANOLE
OLC
Manifestation avec acte : IEEE International Workshop on Ubiquitous Wireless Multihop Networking (UWMN-08), Shanghai (Chine), 17-20 Décembre 2008, 6p. , N° 08672
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Mots-Clés / Keywords
Wireless mesh networks; Route stability; Congestion; Route maintenance; Routing protocols;
Proposal of a novel bandwith management framework for IEEE 802.16 based on aggregation
M.EL MASRI, S.ABDELLATIF, G.JUANOLE
OLC
Manifestation avec acte : 2nd IFIP International Conference on New Technologies, Mobility and Security (NTMS'08), Tangers (Maroc), 5-7 Novembre 2008, pp.412-416 , N° 08358
Lien : http://hal.archives-ouvertes.fr/hal-00389542/fr/
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Abstract
In an environment where IEEE 802.16 access networks are used as a backbone for a heterogeneous wireless access network, the question of Quality of Service brings along a questioning on several other aspects: scalability, guarantees, scheduling among others. We give in this paper a general solution answering those questions. This solution is based on an aggregated bandwidth management in the backbone. This aggregation along with specific bandwidth request and scheduling policies are herein specified and discussed.
On enhancing a hybrid admission control algorithm for IEEE 802.11e EDCA
M.EL MASRI, G.JUANOLE, S.ABDELLATIF
OLC
Manifestation avec acte : IFIP Joint Conference on Personal Wireless Communications (PWC'2008), Toulouse (France), 30 Septembre - 3 Octobre 2008, pp.299-310 , N° 08164
Lien : http://hal.archives-ouvertes.fr/hal-00389539/fr/
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Abstract
Call Admission Control is one of the main mechanisms allowing an efficient protection of active flows, especially on a wireless network using a distributed access scheme as is the case for IEEE 802.11e EDCA. We proposed in a previous paper [7] a hybrid admission control algorithm (based on analytical model and on measurements) for EDCA which have proven to perform well when compared to another reference algorithm. We present here general modifications to hybrid admission control algorithms. These modifications are applied to our proposed algorithm and analyzed via simulation. Analysis clearly shows the advantages of these modifications.
An interference and link-quality aware routing metric for wireless mesh networks
U.ASHRAF, S.ABDELLATIF, G.JUANOLE
OLC
Manifestation avec acte : 68th Vehicular Technology Conference (VTC 2008), Calgary (Canada), 22-25 Septembre 2008, 5p. , N° 08175
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This paper presents the Expected Link Performance (ELP) metric for finding high throughput, low delay paths in 802.11 mesh networks. ELP combines three different mechanisms to accurately determine the expected link performance. Link quality information is combined with cross-layered link interference estimation to select optimal paths. Simulation results show that ELP significantly outperforms both hop count as well as the popular ETX metric. ELP has up to 12% higher throughput and about 40% smaller delay than ETX.
Mots-Clés / Keywords
Wireless mesh networks; Routing metric; Interference; ETX;
On the implementation of one process control application type through a network. Considerning three LANS: CAN, WiFi, ZigBee
G.MOUNEY, G.JUANOLE, C.CALMETTES
MRS, OLC, CUFR
Manifestation avec acte : 17th IFAC World Congress, Séoul (Corée), 6-11 Juillet 2008, pp.11582-11587 , N° 07665
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Abstract
This paper wants to present the first reasoning in order to implement on a network a process control application type which is, in a first time, specified with a continuous model (transfer function in the Laplace domain). The network is a local area network and we only consider the MAC layer (frame scheduling) and the physical layer (serial frame transmission). By first reasoning, we mean that, we study the case of a network which is dedicated to the process control application type, and we want to link the stability and the reactivity that the application can get from the service provided by the network (link between the parameters of the open loop transfer function and the network characteristics (frame transfer, frame format, bit rate)). Three networks are considered: CAN, WiFi, ZigBee. This work is a basic work which wants to emphasize the necessary interplay between Automatic Control theory and Networks mechanisms.