Marie-Françoise Servajean

Université Clermont Auvergne

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Michel Misson

Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes

Guéréguin Der Sylvestre Sidibé

Centre National de la Recherche Scientifique

Nadir Hakem

Université du Québec en Abitibi-Témiscamingue

Raphaël Bidaud

Université Clermont Auvergne

Affoua Thérèse Aby

Université de Picardie Jules Verne

Hamadoun Tall

Nazi Boni University

Badr R’Mili

Laboratoire de Chimie Bactérienne

Gérard Chalhoub

Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes

Stéphane Pomportes

Université de Picardie Jules Verne

Aurélien Surier

Université du Québec en Abitibi-Témiscamingue

Cooperative Institutions

Centre National de la Recherche Scientifique

Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes

Université Clermont Auvergne

Clermont Université

Institut Supérieur d’Informatique, de Modélisation et de leurs Applications

Université du Québec en Abitibi-Témiscamingue

Université de Picardie Jules Verne

Université TÉLUQ

Laboratoire de Chimie Bactérienne

Aix-Marseille Université

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Impact of the simulation parameters on the quantitative results of protocols for WSNs

Affoua Thérèse Aby Marie-Françoise Servajean Michel Misson

Many protocols for wireless sensor networks are proposed in the literature. In most of this work, comparisons are made with existing protocols to show that the proposed protocol provides better overall performance without precise specifications of the simulation environment. In this paper we show that for a given propagation model, the value of its main parameters retained in the simulation process has very significant effects on the quantitative results. To do this, we use an asynchronous MAC protocol that we proposed which was compared with the reference MAC protocol specified in the standard IEEE 802.15.4 in beacon enabled mode. We use a realistic propagation model like log-Shadowing and we modify the parameters of this model. In this contribution, we also vary the capture threshold. We intuitively known that the asynchronous MAC protocol will ensure a better overall performance than the standard, we will try to show the diversity of results by intensive simulations. To the best of our knowledge, there are existing studies that show the impact of different propagation models on simulation results. However, no studies have shown this impact with such an important level of detail. From this study we estimate that when two communication protocols are compared, it is important to associate the performance curves with the precise and detailed conditions used for the simulation and to assess the global influence. According to this influence, a vigilance can be reported on the accuracy of results.

10.1109/pimrc.2017.8292267

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Is “Outperform” Still Appropriate to Qualify the Simulation Results of Proposed Protocols for WSNs?

Journal of Communications (2019)

Affoua Thérèse Aby Stéphane Pomportes Marie-Françoise Servajean Michel Misson

10.12720/jcm.14.11.987-1001

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Impact of Simulation Environment in Performance Evaluation of Protocols for WSNs

Lecture notes in computer science (2017)

Affoua Thérèse Aby Marie-Françoise Servajean Nadir Hakem Michel Misson

Duty cycle

10.1007/978-3-319-67910-5_24

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Evaluation of the interest of an extra-slot for a grouped polling-selecting method

Guéréguin Der Sylvestre Sidibé Raphaël Bidaud Marie-Françoise Servajean Nadir Hakem Michel Misson

Switched beam antennas (SBA) have been shown to offer many advantages when used in confined and obstructed environments that represent a difficult radio propagation environment. However, when SBA are used in wireless network, the popular contention-based medium access control protocol such as IEEE 802.15.4 MAC is no longer effective. Furthermore, the contention based nature of IEEE 802.15.4 MAC makes it not suitable for deterministic transmissions. In order to have a good compromise between range, data rate and deterministic behavior, in this paper, we propose data collection schemes based on polling-selecting strategies for low latency deterministic networked (LLDN) systems where the sink is equipped with a SBA and sensor nodes with usual omnidirectional antennas. Our solution is based on IEEE 802.15.4 frame exchanges in star topology. We present an analytical model to evaluate the benefit of using an extra slot in a collection scheme based on polling strategy. Several simulations were conducted to validate the analytical model and show that using an extra slot in a collection scheme based on polling strategy improves the frame delivery rate.

10.1109/ipccc50635.2020.9391538

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Use of a Switched Beam Antenna in a Star Wireless Sensor Network for Data Collection: Neighbor Discovery Problem

Guéréguin Der Sylvestre Sidibé Aurélien Surier Raphaël Bidaud G.Y. Delisle Nadir Hakem

Switched beam antennas (SBA) offer many advantages when used in confined and obstructed environments that represent a difficult radio propagation environment. However to benefit from these antennas, some low layer mechanisms such as MAC (Medium Access Control) protocols, routing protocols and neighbor discovery protocols which are primarily designed to work with omnidirectional antennas need to be redesigned. In this paper, a new neighbor discovery method based on time slotting and random algorithm is proposed. The proposed method is designed for a sink node in a star network and equipped with a switched beam antenna to discover its neighboring nodes. The proposed protocol was implemented in Contiki OS, and several simulations were performed using Cooja. Results show that our protocol gives better performance in terms of delay.

Neighbor Discovery Protocol

10.1109/wisee.2019.8920303

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Le problème de la découverte de voisinage dans une étoile équipée d'une antenne à commutation de faisceaux

HAL (Le Centre pour la Communication Scientifique Directe) (2018)

Guéréguin Der Sylvestre Sidibé Raphaël Bidaud Marie-Françoise Servajean Michel Misson

Les reseaux de capteurs sans fil Ad hoc dedies a la collecte de donnees ont souvent exploite le multi-saut pour assurer la surveillance d’une zone etendue malgre l’usage de liens radio de courte portee. Cette solution a montre ses limites en termes d’efficacite spectrale, de robustesse et de temps de transit des donnees. D’autres solutions basees sur des topologies en etoile emergent pour les reseaux dedies a la surveillance de zones etendues necessitant des debits modestes. Cette etude consiste a equiper le puits de collecte d’une antenne a commutation de faisceaux pour viser un bon compromis: debit/portee. Ce type de solutions est tres expose aux effets du terminal cache qui rend tres specifique la decouverte du voisinage du puits. Nous explorons ici differentes pistes pour realiser cette decouverte rapidement et d’une facon econome en energie.

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Vous avez dit «outperform» ! En êtes-vous sûr ?

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Thérèse Affoua Aby Marie-Françoise Servajean Nadir Hakem Michel Misson

La thematique de recherche traitant des Reseaux de capteurs sans fil fait l’objet de tres nombreuses propositions pour ameliorer l’acces au medium, le routage des donnees et reduire l’energie consommee. Pour estimer le bien-fonde et les performances de ces propositions, des comparaisons sont souvent faites via un outil de simulation comme NS2/3, OPNET, …. Il est interessant de constater que dans une multitude d’articles scientifiques traitant de cette recherche on peut lire dans la conclusion des variantes de « our proposed protocol outperforms…. » Cette conclusion est utilisee meme si les simulations nous donnent un gain de quelques pourcents. Sans etre fausse, cette formulation merite d’etre interpretee. Dans cette contribution nous allons montrer par une comparaison de deux protocoles MAC, que le choix des parametres de simulation peut avoir une influence nettement plus forte qu’un gain de quelques pourcents. Ces deux protocoles ont ete choisis de facon a ce que par intuition, on sache que l’un surpasse (outperforms) l’autre sans ambiguite. Ainsi, nous allons nous attacher a demontrer que le mot « surpasse » est tres dependant des conditions de simulations qui ne sont que tres rarement precisees dans les articles. S’agissant de comparer des protocoles MAC, nous avons retenu trois parametres qui influent grandement sur les resultats de cette comparaison : la topologie, le seuil de capture ainsi que le modele de propagation. Pour ce dernier parametre, nous nous orientons vers le modele shadowing et choisissons plus particulierement de fournir une comparaison en fonction de l’ecart type. Cette analyse nous permet de suggerer qu’il serait plus judicieux de conclure par « our proposed protocol outperforms ….for the simulation set precisely defined in part xx of this contribution… » De plus, si les conditions de simulation sont specifiees de facon complete, elles rendront plus faciles et plus justes les resultats de comparaisons avec d’autres protocoles.

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Performance Evaluation of Neighbor Discovery Algorithms in a Star WSN: Switched beam antenna vs omnidirectional antenna at the Sink

Guerezuin Der Sylvestre Sidibe Hamadoun Tall Marie-Françoise Servajean Michel Misson

One of the key element in performance measurement for a neighbor discovery algorithm with switched beam antennas is how long it takes to discover the neighbors given that nodes do not have any prior knowledge about their neighbors. An impression we may have in neighbor discovery is that algorithms based on directional antennas takes longer time for a node to discover all its neighbors than those entirely based on omnidirectional antennas. We propose two neighbor discovery schemes, one is based on time slotting and the other on the well known CSMA/CA unslotted version. We evaluate the time that the sink needs to discover its neighbors when it is equipped with a switched beam antenna, and when it uses an omnidirectional antenna. Through our simulation results, we show that when neighbor discovery algorithms based on directional antennas are correctly designed, they achieve the same order of performance in terms of time needed by the sink to discover all its neighbors as those based on omnidirectional antennas. Our simulation results also show that when using a switched beam antenna and CSMA/CA algorithm for medium access at the sink, the discovery delay is higher.

Neighbor Discovery Protocol

10.23919/pemwn47208.2019.8986963

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Aloha-like Neighbor Discovery in a WSN Star Topology using a Sink-side Beam Antenna

2022 IEEE International Smart Cities Conference (ISC2) (2019)

Guéréguin Der Sylvestre Sidibé Marie-Françoise Servajean Michel Misson

In data collection area, wireless sensor networks are usually used for their ease of deployment and auto-configuration capabilities. In this paper, we consider a star topology, where the central node is equipped with a switched-beam antenna, while other nodes are using omnidirectional antennas. This configuration enables enhancing the network performance without increasing the cost and complexity of the deployment, and may be suitable for some emerging applications like smart home, smart parking, etc. When directional antennas are used, some common methods like MAC (Medium Access Control) protocols, routing protocols and neighbor discovery protocols need to redesigned. In this work, we propose a neighbor discovery method based on Aloha approach that helps the sink node to discover its neighborhood. Our discovery method uses idle slots reduction mechanism and exploits collaboration between nodes and the sink in order to speed up the discovery process. Collaboration occurs during discovery process when a node shares with the sink its local knowledge of its own neighborhood. We implemented our protocol on contiki OS, and performed several simulations on Cooja. We compared the proposed protocol with a state of the art protocol adapted to work with our network configuration. The results show that our protocol improves the discovery delay by about 25% compared with the PND protocol chosen as reference.

Neighbor Discovery Protocol

Service discovery

Business process discovery

Sink (geography)

10.1109/isc246665.2019.9071641

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Topology Discovery Delay Evaluation in Star Topology Network with Switched-Beam Antenna Sink

Lecture notes in computer science (2019)

Guéréguin Der Sylvestre Sidibé Hamadoun Tall Raphaël Bidaud Marie-Françoise Servajean Michel Misson

Sink (geography)

Star network

10.1007/978-3-030-31831-4_5

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