Al Imam Mohamed Bin Saud University

Riyadh, Saudi Arabia

Al Imam Mohamed Bin Saud University

Riyadh, Saudi Arabia

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Jamaa M.B.,Al Imam Mohamed bin Saud University | Jamaa M.B.,University of Sfax | Koubaa A.,Al Imam Mohamed bin Saud University | Koubaa A.,Polytechnic Institute of Porto | Kayani Y.,Al Imam Mohamed bin Saud University
Procedia Computer Science | Year: 2012

Localization based on Received Signal Strength (RSS) is a key method for locating objects in Wireless Sensor Networks (WSNs). However, current RSS-based methods are ineffective at both deployment and operation design levels since they (i.) usually require a labor-intensive pre-deployment profiling operations to map the RSS to either locations or distances and (ii.) rely on heavy processing operations. These two designs problems limit the possibility of implementing the localization technique on resources constrained sensor nodes and also restrict its scalability and practical use. In this paper, we tackle the challenge of devising a self-organizing and practical RSS-based localization technique that improves on previous approaches in terms of ease of deployment, ease of implementation while still providing a reasonable accuracy. To this end, we come up with a new solution, EasyLoc, a plug-and-play and distributed RSS-based localization method that requires zero pre-deployment configuration. The idea consists in exploiting the available distance information between anchors to derive an online and anchor-specific RSS-to-distance mapping. We show that, in addition to its simplicity, EasyLoc provides location errors of 90% less than 1m and an average error of 0.48m in small environment and 1.8m in large environment. © 2012 Published by Elsevier Ltd.


Cheikhrouhou O.,University of Sfax | Koubaa A.,Polytechnic Institute of Porto | Koubaa A.,Al Imam Mohamed Bin Saud University | Dini G.,University of Pisa | Abid M.,University of Sfax
Personal and Ubiquitous Computing | Year: 2011

Securing group communication in wireless sensor networks has recently been extensively investigated. Many works have addressed this issue, and they have considered the grouping concept differently. In this paper, we consider a group as being a set of nodes sensing the same data type, and we alternatively propose an efficient secure group communication scheme guaranteeing secure group management and secure group key distribution. The proposed scheme (RiSeG) is based on a logical ring architecture, which permits to alleviate the group controller's task in updating the group key. The proposed scheme also provides backward and forward secrecy, addresses the node compromise attack, and gives a solution to detect and eliminate the compromised nodes. The security analysis and performance evaluation show that the proposed scheme is secure, highly efficient, and lightweight. A comparison with the logical key hierarchy is preformed to prove the rekeying process efficiency of RiSeG. Finally, we present the implementation details of RiSeG on top of TelosB sensor nodes to demonstrate its feasibility. © 2011 Springer-Verlag London Limited.


Cheikhrouhou O.,University of Sfax | Koubaa A.,Polytechnic Institute of Porto | Koubaa A.,Al Imam Mohamed bin Saud University | Koubaa A.,Al Imam Mohamed bin University | And 3 more authors.
Procedia Computer Science | Year: 2011

Secure group management is an important issue in Wireless Sensor Networks (WSNs). The most of previous works consider the whole network as a single group managed by a central, powerful node (e.g., the base station) capable of supporting heavy communication, computation and storage cost. However, typical WSNs applications may benefit from being designed and implemented as a collection of multiple logical groups, each one is maintained by a sensor node (the group controller) with constrained resources. Furthermore, previous schemes require multicast support at the routing level to deliver rekeying messages. Unfortunately, multicast may cause a storage and communication overhead that are not affordable in a WSN. In order to go beyond these two limitations, we propose a new secure group management scheme with a lightweight re-keying process. The scheme allows multiple logical groups, each one is maintained and rekeyed separately by a resource-constrained sensor node without requiring multicast routing support. We prove that the scheme is secure and we evaluate its performance from several view points. Actually, we show that our scheme outperforms some previous well-known schemes such as LKH. © 2011 Published by Elsevier Ltd.


Gaddour O.,University of Sfax | Koubaa A.,Polytechnic Institute of Porto | Koubaa A.,Al Imam Mohamed Bin Saud University | Cheikhrouhou O.,University of Sfax | Abid M.,University of Sfax
Proceedings - International Conference on Distributed Computing Systems | Year: 2010

Group communication in Wireless Sensor Networks (WSNs) requires an efficient multicast routing mechanism due to inherent resources and computing constraints of sensor nodes. ZigBee, which is a standard protocol that represents a very prominent technology for WSNs, does not consider multicast routing in its specification. In this paper, a group is defined as a set of nodes that share the same sensory information. The main contributions of this paper are two-folded: First, we propose Z-Cast, an efficient multicast routing mechanism for groups that share the same sensory information in a cluster-tree WSN. Second, we show how to integrate the Z-Cast mechanism in open-ZB which is an open source IEEE 802.15.4/ZigBee implementation. Finally, we demonstrate the efficiency and backward compatibility of our proposal with the standard specification. © 2010 IEEE.


Baccour N.,University of Sfax | Baccour N.,Polytechnic Institute of Porto | Koubaa A.,Polytechnic Institute of Porto | Koubaa A.,Al Imam Mohamed bin Saud University | And 6 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

Radio Link Quality Estimation (LQE) is a fundamental building block for Wireless Sensor Networks, namely for a reliable deployment, resource management and routing. Existing LQEs (e.g. PRR, ETX, Four-bit, and LQI) are based on a single link property, thus leading to inaccurate estimation. In this paper, we propose F-LQE, that estimates link quality on the basis of four link quality properties: packet delivery, asymmetry, stability, and channel quality. Each of these properties is defined in linguistic terms, the natural language of Fuzzy Logic. The overall quality of the link is specified as a fuzzy rule whose evaluation returns the membership of the link in the fuzzy subset of good links. Values of the membership function are smoothed using EWMA filter to improve stability. An extensive experimental analysis shows that F-LQE outperforms existing estimators. © 2010 Springer Berlin Heidelberg.


Cheikhrouhou O.,University of Sfax | Koubaa A.,Polytechnic Institute of Porto | Koubaa A.,Al Imam Mohamed Bin Saud University | Dini G.,University of Pisa | And 2 more authors.
Ad Hoc Networks | Year: 2012

Secure group communication is a paradigm that primarily designates one-to-many communication security. The proposed works relevant to secure group communication have predominantly considered the whole network as being a single group managed by a central powerful node capable of supporting heavy communication, computation and storage cost. However, a typical Wireless Sensor Network (WSN) may contain several groups, and each one is maintained by a sensor node (the group controller) with constrained resources. Moreover, the previously proposed schemes require a multicast routing support to deliver the rekeying messages. Nevertheless, multicast routing can incur heavy storage and communication overheads in the case of a wireless sensor network. Due to these two major limitations, we have reckoned it necessary to propose a new secure group communication with a lightweight rekeying process. Our proposal overcomes the two limitations mentioned above, and can be applied to a homogeneous WSN with resource-constrained nodes with no need for a multicast routing support. Actually, the analysis and simulation results have clearly demonstrated that our scheme outperforms the previous well-known solutions. © 2012 Elsevier B.V. All rights reserved.


Koubaa A.,Al Imam Mohamed Bin Saud University | Koubaa A.,Polytechnic Institute of Porto | Chaudhry S.,Al Imam Mohamed Bin Saud University | Gaddour O.,University of Sfax | And 4 more authors.
Proceedings - Conference on Local Computer Networks, LCN | Year: 2011

Monitoring of Wireless Sensor Networks (WSNs) is a fundamental task to track the network behavior and measure its performance in real-world deployments. In this paper, we present Z-Monitor, a monitoring and a protocol analyzer solution to control and debug IEEE 802.15.4-compliant Low Power Wireless Personal Area Networks (LoWPANs). Z-Monitor does not only support the analysis of well-known ZigBee, 6LoWPAN and RPL protocols, but is also designed to be modular and easily extensible for adding new protocols. The motivation behind the design and implementation of Z-Monitor is the fact that commercially-available products for monitoring and testing IEEE 802.15.4-compliant LoWPANs are mainly too expensive, and typically require special sniffing hardware. Z-Monitor represents a free and extensible solution, does not require special sniffing hardware, and provides comparable services to proprietary and commercial products. We also share our experimental study results that demonstrate the effectiveness of Z-Monitor in meeting its objectives. © 2011 IEEE.


Trigui S.,University of Sfax | Koubaa A.,Al Imam Mohamed Bin Saud University | Koubaa A.,Polytechnic Institute of Porto | Ben Jamaa M.,University of Sfax | And 2 more authors.
Proceedings of the Mediterranean Electrotechnical Conference - MELECON | Year: 2012

Cooperative robots and their integration with Wireless Sensor Networks (WSNs) is an expanding area that still deserves significant research efforts. This paper presents a multi-robot surveillance application supported by a WSN. We investigate the problem of multi-robot coordination for target tracking and capturing. One key distinction of our problem model is to consider a WSN that supports the mission of the multi-robot team. We devised three mechanisms: centralized, distributed and market-based algorithms, which were extensively evaluated under the Player/Stage simulator. Simulation results show that the centralized approach is the most likely solution able to maintain an efficient system cost. © 2012 IEEE.


Gaddour O.,University of Sfax | Koubaa A.,Al Imam Mohamed Bin Saud University | Koubaa A.,Polytechnic Institute of Porto | Chaudhry S.,Al Imam Mohamed Bin Saud University | And 3 more authors.
3rd International Conference on Communications and Networking, ComNet 2012 | Year: 2012

In this paper, we simulate and analyze the performance of the network formation process with the RPL (IPv6 Routing Protocol for Low Power and Lossy Networks), which is a routing protocol specifically designed for Low power and Lossy Networks (LLN) compliant with 6LoWPAN (IPv6 Low power Wireless Personal Area Networks). One motivation behind this work is that RPL is the first prospective candidate routing protocol for low-power and lossy networks, which are a main component in the next generation Internet-of-Things. RPL is still under development, although having gained maturity, and is open to improvements. Indeed, there is a need to understand well its behavior, and investigate its relevance. Our analysis is based on the ContikiRPL accurate and realistic simulation model developed under Contiki operating system. The performance of RPL is evaluated and analyzed for different network settings to understand the impact of the protocol attributes on the network formation performance, namely in terms energy, storage overhead, communication overhead, network convergence time and the maximum hop count. We argue through simulation that RPL provides several features that make it suitable to large scale networks. © 2012 IEEE.


Baccour N.,University of Sfax | Baccour N.,Polytechnic Institute of Porto | Koubaa A.,Polytechnic Institute of Porto | Koubaa A.,Al Imam Mohamed Bin Saud University | And 6 more authors.
Ad Hoc Networks | Year: 2011

Stringent cost and energy constraints impose the use of low-cost and low-power radio transceivers in large-scale wireless sensor networks (WSNs). This fact, together with the harsh characteristics of the physical environment, requires a rigorous WSN design. Mechanisms for WSN deployment and topology control, MAC and routing, resource and mobility management, greatly depend on reliable link quality estimators (LQEs). This paper describes the RadiaLE framework, which enables the experimental assessment, design and optimization of LQEs. RadiaLE comprises (i) the hardware components of the WSN testbed and (ii) a software tool for setting-up and controlling the experiments, automating link measurements gathering through packets-statistics collection, and analyzing the collected data, allowing for LQEs evaluation. We also propose a methodology that allows (i) to properly set different types of links and different types of traffic, (ii) to collect rich link measurements, and (iii) to validate LQEs using a holistic and unified approach. To demonstrate the validity and usefulness of RadiaLE, we present two case studies: the characterization of low-power links and a comparison between six representative LQEs. We also extend the second study for evaluating the accuracy of the TOSSIM 2 channel model. © 2011 Elsevier B.V. All rights reserved.

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