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17464
02/02/2018

An SDN hybrid architecture for vehicular networks: application to intelligent transport system

S.TOUFGA, P.OWEZARSKI, S.ABDELLATIF, T.VILLEMUR

SARA

Manifestation avec acte : Embedded Real Time Software and Systems ( ERTS² ) 2018 du 31 janvier au 02 février 2018, Toulouse (France), Février 2018, 8p. , N° 17464

Lien : https://hal.laas.fr/hal-01663766

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Abstract

Vehicular networks are one of the cornerstone of an Intelligent Transportation System (ITS). They are expected to provide ubiquitous network connectivity to moving vehicles while supporting various ITS services, some with very stringent requirements in terms of latency and reliability. Two vehicular networking technologies are envisioned to jointly support the full range of ITS services : DSRC (Dedicated Short Range Communication) for direct vehicle to vehicle/Road Side Units (RSU) communications and cellular technologies. To the best of our knowledge, approaches from the literature usually divide ITS services on each of these networks according to their requirements and one single network is in charge of supporting the each service. Those that consider both network technologies to offer multi-path routing, load balancing or path splitting for a better quality of experience of ITS services assume obviously separately controlled networks. Under the umbrella of SDN (Software Defined Networking), we propose in this paper a hybrid network architecture that enables the joint control of the networks providing connectivity to multi-homed vehicles and, also, explore the opportunities brought by such an architecture. We show through some use cases, that in addition to the flexibility and fine-grained programmability brought by SDN, it opens the way towards the development of effective network control algorithms that are the key towards the successful support of ITS services and especially those with stringent QoS. We also show how these algorithms could also benefit from information related to the environment or context in which vehicles evolve (traffic density, planned trajectory, ..), which could be easily collected by data providers and made available via the cloud.

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17388
19/01/2018

Weighted localization in mobile wireless networks

I.MAHJRI, S.MEDJIAH, A.DHRAIEF, K.DRIRA, A.BELGHITH

SARA, HANA Research Group

Revue Scientifique : Internet Technology Letters, Vol.1, N°1, e12p., Janvier 2018 , N° 17388

Lien : https://hal.laas.fr/hal-01619274

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Abstract

Localization of wireless devices is a crucial requirement for many emerging applications such as environmental monitoring, intelligent transportation, home automation, health-care monitoring and social networking. In this letter, we propose AWL a new Aggregate Weighted Localization algorithm for mobile wireless networks. The proposed algorithm is distributed and requires low computational and communication overheads enabling its use in resource-limited devices.

142065
17442
11/12/2017

An autonomic cognitive pattern for smart IoT-based system manageability: application to comorbidity management

E.MEZGHANI, E.EXPOSITO, K.DRIRA

SARA, LIUPPA

Rapport LAAS N°17442, Décembre 2017, 17p.

Lien : https://hal.laas.fr/hal-01651945

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Abstract

The adoption of the Internet of Things (IoT) drastically witnesses an increase in different domains, and contributes to the fast digitalization of the universe. Henceforth, next generation of IoT-based systems are set to become more complex to design and manage. Collecting real-time IoT generated data unleashes a new wave of opportunities for business to take more precise and accurate decisions at the right time. However, a set of challenges including the design complexity of IoT-based systems and the management of the ensuing heterogeneous big data as well as the system scalability; need to be addressed for the development of flexible smart IoT-based systems. Consequently, we proposed a set of design patterns that diminish the system design complexity through selecting the appropriate/combination of patterns based on the system requirements. These patterns identify four maturity levels for the design and development of smart IoT-based systems. In this paper, we are mainly dealing with the system design complexity to manage the context changeability at runtime. Thus, we delineate the autonomic cognitive management pattern, which is most mature level. Based on the autonomic computing, this pattern identifies a combination of management processes able to continuously detect and manage the context changes. These processes are coordinated based on cognitive mechanisms that allow the system perceiving and understanding the meaning of the received data to take business decisions, as well as to dynamically discover new processes meeting the requirements evolution at runtime. We demonstrated the use of the proposed pattern with a use case from the healthcare domain, more precisely the patient comorbidity management based on wearables.

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17280
11/12/2017

A performance analysis of orchestra scheduling for TSCH networks

S.REKIK, N.BACCOUR, M.JMAIEL, K.DRIRA

ReDCAD Laboratory, SARA

Revue Scientifique : Internet Technology Letters, 10p., Décembre 2017, DOI: 10.1002/itl2.4 , N° 17280

Lien : https://hal.archives-ouvertes.fr/hal-01575098

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Abstract

The IEEE 802.15.4 TSCH (Time Slotted Channel Hopping) represents the latest generation of low-power and highly reliable MAC protocols. It orchestrates the medium access according to a time-frequency communication schedule. However, TSCH specification does not provide any practical solution for the establishment of the schedule. Orchestra is a recent scheduling solution for TSCH that brings significant advantages such as, the use of simple scheduling rules, the low signaling overhead, and the high delivery ratio it is able to fulfill. In this paper, we investigate the use of TSCH protocol with Orchestra scheduling approach for the Internet of Things (IoT) applications. Performance analysis results demonstrate that despite its unique features, Orchestra may incur high end-to-end communication delay, especially when the traffic is not uniformly distributed in the network. This limitation makes Orchestra not sufficiently convenient for several delay-sensitive IoT applications, such as smart grid applications.

141733
17440
08/12/2017

Service-Oriented Computing – ICSOC 2016 Workshops

F.CHAROY, K.DRIRA, H.WANG, Q.YU, Y.WANG, Y.YAN, J.MENDLING, M.MOHAMED, Z.WANG, S.BHIRI

INRIA Lorraine, SARA, Southeast University, Rochester Institute, Macquarie Univ, Univ de Concordia, WU, IBM, New York, HIT, Monastir

Ouvrage (éditeur) : Service-Oriented Computing – ICSOC 2016 Workshops, Springer, N°ISBN 978-3-319-68135-1, Décembre 2017, 222p. , N° 17440

Lien : https://hal.inria.fr/hal-01651943

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17435
08/12/2017

Performance degradation in parallel-server systems

J.DONCEL, U.AYESTA, S.AALTO

SARA, University Helsinki

Rapport LAAS N°17435, Décembre 2017, 19p.

Lien : https://hal.archives-ouvertes.fr/hal-01635251

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Abstract

We consider a parallel-server system with K homogeneous servers where incoming tasks, arriving at rate λ, are dispatched by n dispatchers. Servers are FCFS queues and dispatchers implement a size-based policy such that the servers are equally loaded. We compare the performance of a system with n > 1 dispatchers and of a system with a single dispatcher. Every dispatcher handles a fraction 1/n of the incoming traffic and balances the load to K/n servers. We show that the performance of a system with n dispatchers, K servers and arrival rate λ coincides with that of a system with one dispatcher, K/n servers and arrival rate λ/n. We define the degradation factor as the ratio between the performance of a system with K servers and arrival rate λ and the performance of a system with K/n servers and arrival rate λ/n. We establish a partial monotonicity on n for the degradation factor and, therefore, the degradation factor is lower-bounded by one. We then investigate the upper-bound of the degradation factor for particular distributions. We consider two continuous service time distributions: uniform and Bounded Pareto that have increasing and decreasing failure rates, respectively; and a discrete distribution with two values, which is the distribution that maximizes the variance for a given mean. We show that the performance degradation is small for uniformly distributed job sizes, but that for Bounded Pareto and two points distributions it can be unbounded. We have investigated the degradation using the distribution obtained from real traces.

141694
18004
30/11/2017

A lightweight snapshot-based DDoS detector

G.ROUDIERE, P.OWEZARSKI

TSF, SARA

Manifestation avec acte : International Conference on Network and Service Management ( CNSM ) 2017 du 26 novembre au 30 novembre 2017, Tokyo (Japon), Novembre 2017, 16p. , N° 18004

Lien : https://hal.laas.fr/hal-01676810

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Abstract

Despite the efforts made from both the research community and the industry in inventing new methods to deal with distributed denial of service attacks, they stay a major threat in the Internet network. Those attacks are numerous, and can prevent, in most serious cases, the targeted system from answering any request from its clients. Detecting such attacks means dealing with several difficulties, such as their distributed nature or the several evasions techniques available to the attackers. The detection process has also a cost, which includes both the resources needed to perform the detection and the work of the network administrator. In this paper we introduce AATAC (Autonomous Algorithm for Traffic Anomaly Detection), an unsupervised DDoS detector that focuses on reducing the computational resources needed to process the traffic. It models the traffic using a set of regularly created snapshots. Each new snapshot is compared to this model using a k-NN based measure to detect significant deviations toward the usual traffic profile. Those snapshots are also used to provide the network administrator with an explicit and dynamic view of the traffic when an anomaly occurs. Our evaluation shows that AATAC is able to efficiently process real traces with low computational resources requirements, while achieving an efficient detection producing a low number of false-positives.

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17415
24/11/2017

Architecture extensible et autonome pour une couche de transport evolutive. Application aux communications aéronautiques par satellite

M.OULMAHDI

SARA

Doctorat : INSA de Toulouse, Novembre 2017, 141p., Président: C.GHEDIRA GUEGAN, Rapporteurs: A.MELLOUK, M.OUSSALAH, Examinateurs: A.BOUKERRAM, L.SLIMAN, N.VAN WAMBEKE, Directeurs de thèse: C.CHASSOT, A.TARI , N° 17415

Lien : https://hal.laas.fr/tel-01660846

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Résumé

Ces dernières décennies ont été caractérisées par une évolution massive de l’Internet sur tous les plans, couvrant les applications et les technologies réseau. En conséquence, de nouveaux besoins pour les applications et de nouvelles contraintes réseaux apparaissent ; rendant ainsi les protocole (TCP et UDP notamment) de moins en moins efficaces, et plusieurs nouveaux protocoles ont été proposés. Cependant, à cause de plusieurs limites architecturales de la couche Transport, ces nouveaux protocoles n’ont pas été déployés. Partant de ce constat, le travail effectué dans cette thèse porte sur la proposition et la réalisation d’une architecture pour la couche Transport, orientée services et basée composants, dotée de capacités d’extensibilité et d’auto-adaptation vis-à-vis des évolutions du contexte applicatif et réseau. La solution proposée repose, d’une part, sur un faible couplage entre les éléments extérieurs (applications et systèmes) et la couche Transport, ainsi qu’entre les composants internes de l’architecture. D’autre part, elle se base sur des modèles et des algorithmes lui permettant de détecter et de prendre en compte les évolutions du réseau ou des applications, et d’adapter son comportement en conséquence. Une implémentation complète de la solution est proposée et testée dans un cadre de communications aéronautiques par satellite. L’objectif étant la gestion de la transition des protocoles spécifique au monde aéronautique vers les protocoles de l’Internet, ainsi que la gestion, au niveau Transport, des liens physiques hétérogènes. Les tests démontrent la faisabilité d’une telle architecture extensible et autonome, les gains en performance qu’il est possible d’obtenir, et les coûts qui en résultent.

Mots-Clés / Keywords
Transport; Configurabilité; Extensibilité; Autonomie; Aéronautique; Satellite; Configurability; Extensibility; Autonomy; Aeronautic;

141613
17310
21/11/2017

A generic and configurable topology discovery service for software defined wireless multi-hop network

L.CHEN, S.ABDELLATIF, P.BERTHOU, B.NOUGNANKE, T.GAYRAUD

SARA

Manifestation avec acte : ACM International Symposium on Mobility Management and Wireless Access ( MOBIWAC ) 2017 du 21 novembre au 25 novembre 2017, Miami (USA), Novembre 2017, 4p. , N° 17310

Lien : https://hal.laas.fr/hal-01583905

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Abstract

We present a topology discovery service for software-defined wireless multi-hop networks, which is capable of capturing rich information about the network topology, such as link quality, interference and node characteristics etc., to effectively support the requirements of higher-layer SDN applications such as routing, channel allocation and transmission power control with enhanced flexibility. We analyse the general topology representation required by such SDN applications and specify the procedure and mechanism required at the controller and nodes to maintain this representation. A proof-of-concept implementation of our service on an SDN enabled multi-channel multi-interface wireless multi-hop network testbed shows the feasibility of our proposal.

140915
17302
21/11/2017

Cross fertilization between wireless testbeds and NS-3 simulation models

G.KREMER, P.OWEZARSKI, P.BERTHOU

SARA

Manifestation avec acte : ACM International Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems ( MSWIM ) 2017 du 21 novembre au 25 novembre 2017, Miami (USA), Novembre 2017, 9p. , N° 17302

Lien : https://hal.laas.fr/hal-01575822v1

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Abstract

Network simulators are ooen used for their simplicity and cost regarding wireless networks. However, their realism is ooen criticized and their results challenged. e main concern comes from the modeling of the PHY and MAC layers. To assess the performances of these simulators and their models, the results of simulations are ooen compared with experimental results. However, the comparison methodolo-gies used in these studies may introduce biases. is work focuses on accurately discovering and analyzing the reasons for the calibration problems or implementation bugs in sim-ulators and experimental devices. For this purpose, we leverage the famous Root Cause Analysis (RCA) technique for comparing traces issued from diierent simulations and real experiments, that includes the study of the root causes of dis-similarities. roughout the paper, our RCA-based method has been applied to detect and analyze a performance anomaly between NS-3 simulation and our lab wireless testbed when transmiiing data over a WIFI 802.11 link. It especially details how low level traac traces have been generated in both environments for similar scenarios, and how they can accurately be compared and their diierences analyzed. ACM Reference format:

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