research activities report - coins-lab.org fileacademic experience after phd. 2006-current assistant...

République Tunisienne

Cycle de Formation Doctorale dans la Discipline

Informatique and Réseaux

Habilitation Universitaire

2010

Ministère de l’Enseignement Supérieur et de la Recherche Scientifique

Université de Sfax

École Nationale d’Ingénieurs de Sfax

RESEARCH ACTIVITIES REPORT

Presented in

National School of Engineers of Sfax

For receiving

HABILITATION QUALIFICATION

in Computer Science

By

AANNIISS KKOOUUBBAAAA

PhD. National Polytechnic Institute of Lorraine (IN PL), LORIA/INRIA Assistant Professor – Al-Imam Mohamed bin Saud Univ ersity, Saudi Arabia

Research Associate – CISTER Research Group, Portuga l

OOUUTTLLIINNEE

Recent Situations .................................................................................................................... 3

Graduations ............................................................................................................................ 3

Academic Experience ............................................................................................................. 4

Distinctions and Awards ........................................................................................................ 4

Research Grants and Funded Projects .................................................................................... 7

International Research Working Groups .............................................................................. 10

PhD Supervising Activities .................................................................................................. 12

Master Supervising Activities .............................................................................................. 17

Publications .......................................................................................................................... 20

AAPPPPEENNDDIICCEESS

DDRR.. AANNIISS KKOOUUBBAAAA h-index = 14, citations to my papers = 850

Birthday : 30 July 1977 (Tunis) Nationality : Tunisian Status : Married Professional Address Al-Imam Mohamed bin Saud University College of Computer and Information Sciences Computer Science Department Riyadh (Saudi Arabia) Phone: +966 1 25 81 921 Fax: +966 1 25 91 616 Mobile: +966 5 08 612 974

Email: [email protected] | [email protected] University IMAMU Homepage : http://faculty.imamu.edu.sa/ccs/amkoubaa/ CISTER Research Homepage : http://www.dei.isep.ipp.pt/~akoubaa/ Teaching Homepage : http://coins.csrlab.org/imamu/akoubaa/cs433/

http://coins.csrlab.org/imamu/akoubaa/cs141/ http://coins.csrlab.org/imamu/akoubaa/cs140/

RREECCEENNTT SSII TTUUAATTII OONNSS

Nov 2009 – Current: Leader of COINS Research Group, Al-Imam Mohamed bin Saud University 2006 - Current: Assistant Professor

University: Al-Imam Mohamed bin Saud University College: College of Computer and Information Sciences Department: Computer Science Dept.

2006 - Current: Research Associate Research Institution: CISTER Research Unit (ranked first in Portugal), Portugal University: Polytechnic Institute of Porto (Portugal)

2005-2006: Post-Doc Researcher

University: Polytechnic Institute of Porto (Portugal) Research Affiliation: CISTER Research Unit (ranked first in Portugal), Portugal

GGRRAADDUUAATTII OONNSS

2001-2004 PhD in Computer Science, National Polytechnic Institute of Lorraine (INPL), FRANCE Subject: Management of Real-Time QoS using (m,k)-firm Constraints in Packet Switching Networks Defended: 27 October 2004

Pr. Jean-Pierre THOMESSE (Supervisor), Pr. Ye-Qiong SONG (Co-Supervisor) Research Affiliation: TRIO (LORIA) Electronic Version: http://www.loria.fr/~akoubaa/PhD/ (in French)

2000-2001 Master in Computer Science (Telecommunications, Networks and Services), University of Henri Poincaré Nancy I, FRANCE, Rank 9th/60, July 2001.

Subject: Switched Ethernet and QoS for Real-Time Applications Affiliation: TRIO Research Group, LORIA/INRIA Lorraine

1997-2000 Engineering Diploma in Telecommunications, (Specialty: Computer Science and Networks), Engineering School of Telecommunications of Tunis (Sup’Com), Ranked 3rd/27, July 2000.

AACCAADDEEMM II CC EEXXPPEERRII EENNCCEE

After PhD.

2006-Current Assistant Professor, Al-Imam Mohamed Ibn Saud University / CS department

2006-Current Research Associate, CISTER Research Unit, Porto, Portugal.

2005-2006 Post-Doc Researcher, CISTER Research Unit, Porto, Portugal.

2004-2005 Assistant Professor, University of Nancy I / IUT Nancy Brabois (GTR)

Before PhD.

2001-2004 Teaching Assistant, National Polytechnic Institute of Lorraine (INPL), ENSEM.

February 2003 Invited Teaching Assistant, Higher Institute of Computer Science and Multimedia, Tunisia (Computer Networks and Communication Systems).

2000-2001 Teaching Assistant, University Nancy I, University Nancy II,

DDII SSTTII NNCCTTII OONNSS AANNDD AAWWAARRDDSS

Feb 2011 Best Master Award, for my Master Student Maissa Ben Jamaa for her Master Thesis An Experimental Study for the Performance Evaluation and Optimization of Link Quality Estimators in Wireless Sensor Networks. Award granted at EWSN 2011 conference and Sponsored by the European Network of Excellence CONET.

Mar 2010 Research Excellence Prize, at Al-Imam Mohamed bin Saud University, Area: Natural and Computer Sciences.

I received this award in the first annual competition organized by Al-Imam Mohamed bin Saud University for his faculty members. I was one of the four award winners at the University level in all disciplines, so I was the only winner of the Research Excellence Prize in the area of Natural and Computer Sciences.

Link: http://www.imamu.edu.sa/news/Pages/news_24_03_1431_1.aspx

Prize Certificate is attached to this activity report.

Dec 2009 Best Demo Award, The First International School on Cyber-Physical and Sensor Networks (SensorNets 2009), Monastir, Tunisia, December 17-22, 2009.


Link: http://www.sensornets-school.org/

Feb 2009 Best Master Award, for my Master Student Ricardo Severino for his Master Thesis On the use of IEEE 802.15.4/ZigBee for Time-Sensitive Wireless Sensor Network Applications. Award granted at EWSN 2009 conference and Sponsored by the European Network of Excellence CONET.

Link: http://www.cooperating-objects.eu/events/ewsn-2009-awards/

July 2007 Best Paper Award in ECRTS 2007 conference. The most reputed conference in real-time systems in Europe.


AADDMM II NNII SSTTRRAATTII VVEE AANNDD AACCAADDEEMM II CC RREESSPPOONNSSII BBII LL II TTII EESS

• Selected to participate in the discussions of Strategic Plan of Al-Imam University prepared in collaboration with Stanford Research Institute (SRI), 2010.

• Selected to participate in preparing the Center of Sciences and Technology at Al-Imam University, 2007.

• Representative of CS department in Quality Unit, since 2007. • Chair of Graduation Project Committee, since 2007. • Chair of Course Coordination Committee, since 2006.

TTEEAACCHHII NNGG AACCTTII VVII TTII EESS

I have been teaching several courses during the last six years. I was an assistant professor at IUT Brabois (Nancy, France) in 2004-2005, then I an assistant professor at Al-Imam Mohamed bin Saud University since 2006. Table 1 presents a summary of my teaching activities after 2004 (PhD), and Table 2 presents my previous teaching activities before getting the PhD. In this report, I will provide focus only for teaching activities after PhD. Table 1. Teaching activities after PhD. Course Title/Content Periods Students Hours

Al-Imam Mohamed bin Saud University,

College of Computer and Information Sciences

C++ Programming 1 Spring 2011 Level 1 4 Credit Hours

C++ Programming 2 (Object Oriented Programming)

Spring 2011 Level 2 4 Credit Hours

Seminars Spring 2010, Fall 2009

Spring 2009

Undergraduate Level 7

1 Credit Hour

Simulation and Modeling Spring 2010, Fall 2009

Spring 2009, Fall 2008



4 Credit Hours

Internet Applications Fall 2007



4 Credit Hours

Database Management Systems (DBMS)

Fall 2007



4 Credit Hours

IUT Nancy Brabois University Nancy I (FRANCE)

Java Programming Sept 2004 → Feb 2005 Undergraduate (Bac+1)

Lectures: 40 H Labs : 48H

Databases Nov 2004 → Feb 2005 Undergraduate (Bac+2)

Lectures: 46 H

Computer Networks Feb 2005 → May 2005 Undergraduate (Bac+1)

Lectures + Labs: 44 H

JDBC and Servelet Programming

Feb 2005 → May 2005 Undergraduate (Bac+2)

Labs : 16H

Table 2. Teaching activities before PhD. ENSEM-INPL (FRANCE)

Design and Analysis of Computer Systems

2001-2004 Graduate (Bac+5)

Lectures: 6H

Labs: 48 H

Embedded Systems (CAN) 2001-2004 Graduate (Bac+5)

Labs: 24 H

Performance Evaluation of Discrete Event Systems


Labs: 16H

Others: Network Programming, Unix, C& JAVA and


Labs and Lectures: 50 H

Basic Programming 2001-2004 Undergraduate Labs: 90H

ISIMS (TUNISIA) Computer Networks and Communication Systems

2003 Undergraduate (Bac+2)

Lecture: 20H

Course Development For all my courses, I have developed all the course materials including PowerPoint Slides, homeworks, projects, exercises, exams, etc. My course materials have been put online on website to make the interaction easier with the students. Refer to course website in the first page of my CV.

Research Activities

PPAARRTTII CCII PPAATTII OONN TTOO II NNTTEERRNNAATTII OONNAALL SSCCII EENNTTII FFII CC CCOOMM MM UUNNII TTYY

Participation as Journal Editor

• Guest Editor in special issue in Springer Journal of Personal and Ubiquitous Computing, 2011. • Editorial Board member of the International Journal of Ubiquitous Systems and Pervasive Networks • Guest Editor for the special issue “Wireless Communications and Networks” in the International

Journal Communications of the ACS, 2010 (in Arabic Language).

Participation as Program Chair

• The 2nd International Conference on Ambient Systems, Networks and Technologies (ANT-2011), Ontario, Canada, 2011.

• The 6th International Symposium on Intelligent Systems Techniques for Ad hoc and Wireless Sensor Networks, Ontario, Canada, 2011.

• The International Conference on Wireless and Ubiquitous Systems (ICWUS 2010), October 2010, Sousse, Tunisia.

• Founder and Program Chair of the First International School on Cyber-Physical Systems and Sensor Networks, December 2009.

• The 7th Workshop of Real-Time Networks, RTN’08, Prague, Czech Republic, July 1, 2008, in conjunction with the 20th Euromicro Intl Conference on Real-Time Systems .

Participation as Program Committee Member (2010-2011 only)

• The 10th International Workshop on Real-Time Networks, Porto, Portugal, July 2011. • The International Workshop on Wireless Sensor, Actuator and Robot Networks (WiSARN), Shanghai,

China, April 2011. • Third International Conference on Ad Hoc Networks, August 18-20, 2010, Paris, France. • The Australasian Telecommunication Network Application Conference, 31 October - 3 November

2010, Langham Hotel, Auckland, New Zealand. • Second International Conference on Ad Hoc Networks, August 18-20, 2010, Victoria, British

Columbia, Canada. • The Sixth International Computing Conference in Arabic (ICCA 2010), Hammamet, Tunisia, May • 2010. • The ACS/IEEE Workshop Future Trends on Ad-hoc and Sensor Networks (FT-ASN 2010), in

Conjunction with the 8th ACS/IEEE International Conference on Computer Systems and Applications, AICCSA 2010, Hammamet, Tunisia, May 16-19, 2010.

• The First International Workshop on Wireless Sensor, Actuator and Robot Networks (WiSARN'10), Montreal, Canada, June 17, 2010.

• The 9 the International Workshop on Real-Time Networks (RTN'10), Brussels, Belgium, July 6-9, 2010.

PPAARRTTII CCII PPAATTII OONN TTOO TTRRAAII NNII NNGG CCOOUURRSSEE AANNDD WWOORRKK SSHHOOPPSS

• “Teaching and Learning”, duration 1 week , organized by Wolongong University, location Al-Imam University, 2011.

• “Workshop for specification of Strategic Plan of Al-Imam University”, duration: 1 day, organized by Stanford Research Institute, location: Al-Imam University, 2010.

• “Quality Assurance and Accreditation Workshop”, duration 1 week, organizer: NCAAA, location: Al-Imam University, 2010.

• Certification in “Project Management Training Course”, duration: 4 weeks, organizer: XXX , location: Al-Imam University, 2009.

• “National workshop on Strategic Plan for Science and Technology” Duration: 3 days, organized by KACST, location: Madareem Crown Hotel, 2007.

RREESSEEAARRCCHH GGRRAANNTTSS AANNDD FFUUNNDDEEDD PPRROOJJEECCTTSS

OONNGGOOII NNGG FFUUNNDDEEDD PPRROOJJEECCTT

Z-Monitor Project

May 2010 – Apr 2012

Research Grant from Deanship of Research at Al-Imam Mohamed bin Saud University.

Project: Z-Monitor: A Monitoring Tool for IEEE 802.15/ZigBee Wireless Sensor Networks

Role: Principal Investigator.

Duration: 2 years (May 2010 - Apr 2012).

Funding Institute: Deanship of Research, Al-Imam Mohamed bin Saud University.

Project website: http://www.z-monitor.org/

Project Description

In this project, we aim at the design and the development of generic tool/software, Z-Monitor, for monitoring, maintaining and testing ZigBee-based WSNs. The motivation of this proposal is triggered by the fact that commercial products for monitoring and testing ZigBee-based WSNs (such as Daintree Sniffer Application) are too expensive and not widely available since this technology is relatively new. They also require special sniffing hardware. Our solution will be based on the use of a simple mote for sniffing traffic instead of a special hardware.

Z-Monitor will be designed and implemented to be interoperable with TKN and open-ZB implementations, which are open source implementations of the standard distributed with TinyOS operating system. It will be integrated within the context of the two international working groups: TinyOS 15.4 WG and TinyOS ZigBee WG.

lowNetQoS Project

June 2010 – Jan 2012

Research Grant from Deanship of Research at Al-Imam Mohamed bin Saud University.

Project: lowNetQoS: Network and QoS Management for 6Lowpan

Role: Associate Researcher.

Duration: 1.5 years (June 2010 - Jan 2012).


Project Description

Internet Protocol (IP) connectivity to Wireless Sensor Networks (WSNs) has enabled ubiquity of devices. IPv6 over IEEE802.15.4 Low Power Wireless Personal Area Networks (6LoWPAN) are the realization of these IP based Ubiquitous Sensor Networks (IP-USNs). The emerging range of 6LoWPAN applications includes consumer appliances, home automation, monitoring and control in industrial environments, and environmental monitoring and sensing. This integration of sensor networks with IPv6 will help realizing ubiquity by allowing users to access the services across sensor networks and IP networks. The existence of 6lowpan brings in generous convenience for the users but implicates underlying requirements and technical challenges which include but are not limited to network management and QoS provisioning.

The project will address the network monitoring and Management and QoS provisioning mechanism for 6Lowpan networks. The aim of the project is to develop technology for effective and efficient 6Lowpan Management and QoS technology that could by the exploited by local and International community and Industry. The project will in particular develop a simple, power efficient, network management and monitoring framework. The project will also develop a network state aware QoS provisioning mechanism that shall guarantee required performance to the applications. The project is unique in its objective as both the areas i.e., remote 6Lowpan monitoring and management, and network state adaptive QoS provisioning have not really been explored in the IP-enabled sensor networks research.

R-Track Project

Oct 2009-Sep 2011

Research Grant funded by the National Plan for Sciences and Technology under the Computer Science Research Program (Artificial Intelligence Track).

Project: distributed multi-robot tracking system using wireless sensor networks ( r-track)


Duration: 2 years (Oct 2009 - Sept 2011).

Funding Institute: National Plan for Sciences and Technology, Saudi Arabia.

Website: http://www.rtrackp.com/

Project Description The R-Track project aims at the design of a distributed multi-robot tracking system using wireless sensor networks, which has started on October 2009 for 2-years period.

The project is funded by the National Plan for Sciences and Technology under the Computer Science Research Program (Artificial Intelligence Track). The research program is managed by the Unit of Sciences and Technology in the College of Computer and Information Sciences at Al-Imam Mohamed bin Saud Islamic University.

The objective of the R-Track project is to design and intelligent robot tracking and monitoring system that takes profit from the advantages of WSNs to provide real-time tracking of multiple robots towards the achievement of a common cooperative task (i.e. intrusion detection, target tracking, etc.). The main characteristics of the envisaged system is to:

1. Provide high level of localization accuracy, 2. Ensure real-time guarantees such that the delay between the detection and

tracking is bounded and small, 3. Reduce the ratio of false alarms by using group-based detection techniques

instead of individual detection, 4. Rely on distributed processing paradigm in the wireless sensor network to assist

the cooperative work of the robots.

It envisages the development of an experimental prototype demonstrating the real deployment of R-Track system where multiple robots supported by a wireless sensor network cooperatively interact to track an intruder in a monitored region.

CONET

European Network of Excellent

Oct 2008-Sep 2012

Research Cluster: COTS-based Architecture for QoS in Large-Scale Distributed Embedded Systems (COTS4QoS)

Role: Associate Researcher (ISEP-IPP)

Duration: 4 years (Oct 2008 - Sept 2012).

Website: http://www.cooperating-objects.eu/research-clusters/cots-based-architecture-for-qos-in-large-scaledistributed- embedded-systems/

Funding Institute: The European Union, under the context of European Network of Excellence (CONET).

CCOOMM PPLL EETTEEDD FFUUNNDDEEDD PPRROOJJEECCTTSS

Jan 2008-Sep 2009 Research Grant from Deanship of Research at Al-Imam Mohamed bin Saud University.

Project: Arabic Book on Wireless Sensor Networks.


Duration: 18 months (Jan 2008 – Sept 2009).


Project successfully completed.

II NNTTEERRNNAATTII OONNAALL RREESSEEAARRCCHH WWOORRKK II NNGG GGRROOUUPPSS

Project: TinyOS ZigBee Working Group

Role: WG Chair.

Duration: open.

Website: http://www.tinyos.net/scoop/special/working_group_tinyos_zigbee

Objective The purpose of the TinyOS ZigBee WG is to

1. Implement and maintain a standard-compliant implementation of the ZigBee-Pro specs, 2. Build the ZigBee stack upon the IEEE 802.15.4 protocol stack developed by the TinyOS 802.15.4 WG, 3. Provide enhancements/variants/add-ons to the ZigBee standard protocol in terms of of QoS,

synchronization services, security, low-power routing, etc. The prospective implementation of the IEEE 802.15.4/ZigBee protocol stack under TinyOS will be based on the merging of two already existing implementations from ISEP-IPP (open-ZB.net) and TUB (TKN154).

Project: open-LQE: A Framework for Benchmarking Link Quality Estimators In Wireless Sensor Networks

Role: Coordinator

Duration: open.

Website: http://www.open-lqe.net/ Objective

Estimating the quality of radio links is of paramount importance in WSNs, namely for designing reliable and energy-efficient WSN protocols/mechanisms (e.g. MAC, routing, mobility management, fault-tolerance, deployment, and topology control). For instance, many routing protocols (e.g. CTP(Collection Tree Protocol)) rely on link quality estimation to select higher quality routes. Therefore, it is important to assess the performance of a link quality estimator (LQE) before selecting and integrating it into a particular network protocol/mechanism.

The open-LQE web site includes the following open-source toolset:

• RadiaLE software tool: RadiaLE is a benchmarking test-bed that enables the performance evaluation of LQEs. It comprises the hardware components of the WSN test-bed (TelosB nodes, USB cables/hubs) and a software tool for setting up and controlling the experiments and also for analyzing the collected data, allowing for LQEs evaluation (more details are given here). While we built up and validated RadiaLE through a test-bed setup in Porto (Portugal), the idea is that anyone can use it in its own location just by downloading and running the following applications:

- Experiment Control Java application. It allows motes programming/control, network configuration and data logging into a MySQL database.

- Data analysis Matlab application. It processes the collected data to provide two main functionalities: links characterization and LQEs perfomence evaluation.

• TinyOS implementation of several Link Quality Estimators

RadiaLE has a default set of LQEs already implemented (that can be easily extended with any other LQE), but these LQEs can also be used independently from RadiaLE. Therefore, we provide the nesC/TinyOS code for the following LQEs, as follows (tested with TOSSIM 2):

- Implementation of 5 LQEs, at CTP routing level: 4bit (the default LQE of CTP) ETX, RNP, PRR and WMEWMA.

- Implementation of 6 LQEs, at the Application level: F-LQE, 4bit, ETX, RNP, PRR and WMEWMA.

Project: ART-WiSe: Architecture for Real-Time communication in Wi reless Sensor networks

Role: Scientific Coordinator.

Duration: open.

Website: http://artwise.cister-isep.info/

Supportive Institute: CISTER Research Unit, Porto, Portugal. Objective The ART-WiSe (Architecture for Real-Time communication in Wireless Sensor networks) research framework aims at devising new communication architectures and mechanisms in order to improve the Quality-of-Service (QoS) in large-scale distributed embedded systems, such as in Wireless Sensor Networks (WSNs).

Our research differs from others mainly due to the merging of two concerns: 1) to achieve traffic differentiation and time-bounded communications in these large-scale networked resource constrained systems; and 2) to rely on standard communication protocols and commercial-off-the-shelf technologies.

For this purpose, we are pursuing a multiple-tiered communication architecture building on the IEEE 802.15.4/ZigBee protocols for the lower Tier (sensor network) and on the IEEE 802.11 protocol for the higher Tier (backbone). Results attained so far on the use of the ZigBee for WSNs (check our open source toolset) with real-time requirements are quite encouraging, but many challenges are yet to be addressed.

Project: open-ZB: Open Source Toolset for IEEE 802.15.4/ZigBee

Role: Scientific Coordinator.

Duration: open.

Website: http://www.open-zb.net/

Supportive Institute: CISTER Research Unit, Porto, Portugal.

Objective

The open-ZB web site aims at disseminating open source implementations of the IEEE 802.15.4/ZigBee protocols, namely providing the following toolset:

• Experimental Tools - Implementation of beacon-enabled mode of the IEEE 802.15.4 protocol stack developed in

nesC, under the TinyOS operating system v1.1.15 and version 2.0 (new) for the CrossBow MICAz and TelosB motes;

- Implementation of the ZigBee Network Layer (including the IEEE 802.15.4) supporting the Cluster-tree topology, featuring our proposed mechanism to schedule de beacon transmission, the Time Division Beacon Scheduling

• Simulation Tools - A simulation model built using OPNET Modeler simulator for the IEEE 802.15.4/ZigBee

beacon-enabled mode featuring the star and cluster-tree topologies

• Other Tools/Utilities - IEEE 802.15.4 beacon-enabled superframe configuration tool - WPAN Calculus tool - Worst-Case Dimensioning of IEEE 802.15.4/ZigBee Cluster-Tree Wireless Sensor Networks

- MATLAB tool

This toolset is being developed within the CISTER Research Group. We have been using this toolset to implement, test and evaluate the current functionalities defined in the IEEE 802.15.4/ZigBee standards as well as new add-ons to these protocols.

PPHHDD SSUUPPEERRVVII SSII NNGG AACCTTII VVII TTII EESS

I have actively participated in the co-supervision of several PhD projects. In what follows, I provide a description of these PhD projects and their outcomes.

PhD Project: Mobility Management in ZigBee-based Wireless Sensor Network

Role: Main Co-Supervisor with Pr. Habib Youssef.

Student: Nouha Baccour.

Start date: Jan. 2006

Expected end: Dec 2010.

University: National School of Engineering, Sfax, Tunisia.

International Collaboration with: CISTER Research Unit (Portugal), ReDCad Research Unit (Tunisia), Prince Research Unit (Tunisia)

Abstract. Recent technological advances and progresses in hardware miniaturization have made wireless sensor networks (WSNs) a viable solution to gather information from the environment and make it available to scientists, or to use sensed data to decide on actions to take on the environment. The paradigm of WSNs has brought new problems and challenges that must be overcome. An important challenge is to develop techniques that prolong the network lifetime by minimizing, as much as possible, the energy consumed by sensor nodes. Such challenge raised the need for energy-awareness at all layers of the networking protocol stack, also at operating systems and sensor nodes hardware design.

Energy-efficient mechanisms for topology control, Medium Access Control (MAC), routing, and mobility management, greatly rely on link quality estimation. This thesis addresses link quality estimation in WSNs.

The goal is to provide a holistic characterization of the link by encompassing several aspects that reflect its quality such as asymmetry and stability. The first part of the thesis describes the conceptual path to the above objective. We present a comprehensive overview on WSNs link characteristics in order to identify important aspects that affect link quality. We also give the main requirements and building blocs for link quality estimation. Finally, we present a detailed classification of existing link quality estimators (LQEs) in WSNs. In doing so, we realize that none of existing LQEs have been thoroughly evaluated. The second part of this thesis presents an extensive comparative performance study of most well-known LQEs. The evaluation methodology consists to analyze the statistical properties of LQEs independently of higher-layer protocols, then investigate their impact on the Collection Tree Routing Protocol (CTP). This comparative study is carried out using TOSSIM 2 simulation as well as real experimentation with RadiaLE, our introduced testbed for benchmarking LQEs. RadiaLE helped us to validate TOSSIM 2 simulation results. Our comparative study demonstrated that existing LQEs are not highly reliable because they base their estimation on a single link property. However, other properties contribute to link quality such as stability and channel quality. The third part of this thesis proposes F-LQE, a new estimator that overcomes the limitations of existing LQEs by considering important link properties that affect link quality, namely delivery, asymmetry, stability, and channel quality. Each property is usually imprecisely measured. Fuzzy logic provides a convenient language to express and combine such imprecise knowledge. Thus we resort to fuzzy logic to estimate link quality. Individual link properties are stated in linguistic terms and combined in a fuzzy rule whose evaluation gives the degree of membership of the link in the fuzzy subset of good quality links. Values of the membership function are smoothed using EWMA filter to improve stability. An extensive experimental analysis, based on both simulation and real measurements, shows that F-LQE outperforms existing estimators. The fourth part of this thesis analyzes the impact of F-LQE, on higher layer protocols, namely Zigbee tree routing and CTP routing protocol.

Related Publications 1. Nouha Baccour, Maissa Ben Jamaa, Denis do Rosario, Anis Koubaa, Habib Youssef, Mario Alves and

Leandro B. Becker. A TestBed for the Evaluation of Link Quality Estimators in Wireless Sensor Networks, The ACS/IEEE Workshop Future Trends on Ad-hoc and Sensor Networks (FT-ASN 2010), Tunisia, May 16-19, 2010.

2. Nouha Baccour, Anis Koubâa, Habib Youssef, Maissa Ben Jamâa, Denis do Rosario, Mario Alves and Leandro Becker. F-LQE: A Fuzzy Link Quality Estimator for Wireless Sensor Networks, The 7th European Conference on Wireless Sensor Networks (EWSN 2010), Coimbra, Portugal, September 17-19, 2010. (Acceptance ratio: 19%).

3. Nouha Baccour, Maissa Ben Jamaa, Denis do Rosario, Anis Koubaa, Mario Alves, Leandro B. Becker, Habib Youssef, and Hossein Fotouhi. Demo Abstract: RadiaLE: a framework for benchmarking link quality estimators, The 7th European Conference on Wireless Sensor Networks (EWSN 2010), Coimbra, Portugal, September 17-19, 2010.

4. Nouha Baccour, Anis Koubâa, Maissa Ben Jamâa, Habib Youssef, Marco Zuniga, and Mario Alves A Comparative Simulation Study of Link Quality Estimators in Wireless Sensor Networks 17th Annual Meeting of the IEEE International Symposium on Modelling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS 2009), South Kensington Campus, Imperial College London, September 21-23, 2009 (Acceptance ratio for extended papers: 20%).

5. Nouha Baccour, Anis Koubaa, Habib Youssef, and Mario Alves. Poster Abstract: Simulation analysis and validation of a Fuzzy Link Quality Estimator, The First International School on Cyber-Physical and Sensor Networks (SensorNets 2009), Monastir, Tunisia, December 17-22 2009.

6. Maissa Ben Jamaa, Nouha Baccour, Anis Koubaa, Denis do Rosarioy, Mario Alves, Leandro Becker, Habib Youssef, and Mohamed Jmaiel. Demo Abstract: A TestBed for the evaluation of Link Quality Estimators in WSNs, The First International School on Cyber-Physical and Sensor Networks (SensorNets 2009), Monastir, Tunisia, December 17-22 2009. (Best Demo Award).

PhD Project: Real-Time Communication over Cluster-Tree Wireless Sensor Networks.

Role: Co-Supervisor with Pr. Zdeněk Hanzálek and Mario Alves.

Student: Petr Jurcik.

Start date: 2006.

Defense date: 01Oct. 2010.

University: Czech Technical University, Prague, Czech Republic.

International Collaboration with: CISTER Research Unit (Portugal), Embedded Systems Group (Czech Republic).

Abstract. Modeling and simulation of the fundamental performance limits of Wireless Sensor Networks (WSNs) is of paramount importance to understand their behavior under the worst-case conditions and to make the appropriate design choices. This is particular relevant for time-sensitive WSN applications, where the timing behavior of the network protocols impacts on the correct operation of these applications. Furthermore, energy efficiency is a key requirement to be fullfilled in these applications since the wireless nodes are usually battery-powered. In that direction this thesis contributes with an accurate simulation model of the IEEE 802.15.4/ZigBee protocols and an analytical methodology for the worst-case analysis and dimensioning of a static or even dynamically changing cluster-tree WSN where the data sink can either be static or mobile. The thesis is focused on the study of WSNs with cluster-tree topology because it supports predictable and energy efficient behavior, which is suited for time-sensitive applications using battery-powered nodes. On the other side, in contrast with the star and mesh topologies, the cluster-tree topology expresses several challenging and open research issues such as a precise cluster scheduling to avoid inter-cluster collisions (messages/beacons transmitted from nodes in different overlapping clusters). Hence, the next objective is to nd the collision-free periodic schedule of clusters' active portions, called Time Division Cluster Schedule (TDCS), while minimizing the energy consumption of the nodes and meeting all data owns' parameters. The thesis also shows how to apply the proposed methodologies to the specific case of IEEE 802.15.4/ZigBee beacon-enabled cluster-tree WSNs, as an illustrative example that confirms the applicability of general approach for specific protocols. Finally, the validity and accuracy of the simulation model and methodologies are demonstrated through the comprehensive experimental and simulation studies. Using the proposed analytical methodologies and simulation model, system designers are able to easily configure the IEEE 802.15.4/ZigBee cluster-tree WSN for a given application-specific Quality of Service (QoS) requirements prior to the network deployment.

Keywords: cluster-tree; energy efficiency; IEEE 802.15.4; Network Calculus; quality of service; real-time; simulation; wireless sensor network; ZigBee.

Related Publications 1. Petr Jurčík, Anis Koubâa, Ricardo Severino, Mário Alves, Eduardo Tovar, Hanzalek Zdenek

"Dimensioning and Worst-case Analysis of Cluster-Tree Sensor Networks" Accepted for publication in ACM Transactions on Sensor Networks, 2010. Impact factor (in 2009): 1.98

2. Petr Jurčík, Ricardo Severino, Anis Koubâa, Mário Alves, Eduardo Tovar "Real-Time Communications over Cluster-Tree Sensor Networks with Mobile Sink Behaviour" the 14th IEEE

International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA 2008), Kaohsiung, Taiwan, 25 - 27 August 2008.

3. Petr Jurcik, Anis Koubâa, Mário Alves, Eduardo Tovar, Hanzalek Zdenek, "A Simulation Model for the IEEE 802.15.4 Protocol:Delay/Throughput Evaluation of the GTS Mechanism" the 15th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS'07), Bogazici University, Istanbul (Turkey), 24 - 26 October 2007.

PhD Project: Optimal Resource Allocation of MAC Protocols in Wireless Sensor Networks

Role: Co-Supervisor with Pr. Ye-Qiong Song and Pr. Mounir Frikha.

Student: Jamila Ben Slimane.

Start date: 2007.

Expected end: 2011.

University: Higher School of Telecommunications (Sup-Com, Tunisia), University Henri Poincaré (France).

Research Units Involved: INRIA Lorraine (France), MEDIATRON Research Unit (Tunisia).

Abstract. The objective of this PhD is two-folded:

- Cross-layer optimization of WSNs based on UWB technology by proposing mechanisms and solutions that obey, on the one hand, to WSNs constraints and ensure, and on the other hand, to the QoS support and the energy saving in such networks.

- The design of a WHSN (Wireless Hospital Sensor Network) for an application in hospital (medical monitoring of patients and management of doctors).

Related Publications 1. Jamila Ben Slimane, Ye-Qiong Song, Anis Koubâa, Mounir Frikha “Three-Tiered Architecture for

Large-Scale Wireless Hospital Sensor Networks”,The First International Workshop on Mobilizing Health Information to Support Healthcare-related Knowledge Work – MobiHealthInf, Porto, Portugal, 2009.

2. Jamila Ben Slimane, Ye-Qiong Song, Anis Koubâa, Mounir Frikha.“A Prioritized Multi-Channel Multi-Time slot MAC Protocol For Large-Scale Wireless Sensor Networks”, in ComNet’09: The First International Conference on Communications, and Networking, Tunisie Hammamet, Nov. 2009.

3. Jamila Ben Slimane, Ye-Qiong Song, Anis Koubâa, Mounir Frikha. “Control and data channels allocation for Large-Scale UWB-based WSNs”, in ComNet’09: The First International Conference on Communications, and Networking, Tunisie Hammamet, Nov. 2009.

PhD Project: Security in Wireless Sensor Networks

Role: Co-Supervisor with Pr. Mohamed Abid.

Student: Omar Cheikhrouhou.

Start date: 2006.

Expected end: 2011.

University: National School of Engineering of Sfax (ENIS, Tunisia).

Research Units Involved: CES Lab, Sfax Tunisia.

Abstract. Les réseaux de capteurs sans fil (Wireless Sensor Networks) représentent une révolution technologique dans le domaine « technologie de l’information », tirant profit à la fois des systèmes électroniques miniaturisés et des systèmes de communication sans fil. Les réseaux de capteurs peuvent être considéré comme une évolution des réseaux ad hoc et mesh dont lesquels les nœuds ne sont plus de terminaux mais plutôt des capteurs.

Le champ d'utilisation des réseaux de capteurs touche toutes les applications de surveillance nécessitant la collecte d'informations sur une grande étendue ou à grande échelle. Cela est particulièrement intéressant dans les domaines de l'environnement, de la santé, du transport et des systèmes de production.

Un autre type d’application très intéressant est lorsque le réseau de capteurs sert à étendre la zone de couverture d’un réseau à infrastructure existant (WiFi, WiMax, GSM, GPRS,…). Ce type d’application intéresse notamment les opérateurs Internet sans fil (WISP: Wireless Internet Service Provider) qui peuvent donc servir leur client avec peu d’investissement (vu le prix d’un nœud de capteurs).

De ce fait, les réseaux de capteurs constituent un sujet de recherche innovant pour toutes les disciplines des

sciences et techniques de l'information et de la communication: Ils posent tout d'abord une contrainte de consommation d'énergie (les nœuds ont une autonomie en énergie limitée) et les protocoles de communication doivent être optimisés sur ce critère. Ils posent aussi des problèmes liés au facteur d'échelle (ordonnancement et acheminement des messages, dissémination et localisation des nœuds), des problèmes liées au routage, des problèmes de sûreté de fonctionnement et de sécurité.

Related Publications 1. Olfa Gaddour, Anis Koubâa, Omar Cheikhrouhou, Mohamed Abid, “Z-Cast: A Multicast Routing

Mechanism in ZigBee Cluster-Tree Wireless Sensor Networks” Third International Workshop on Sensor Networks (SN 2010) in conjunction with IEEE ICDCS 2010, Genoa, Italy, June 21-25, 2010.

2. Omar Cheikhrouhou, Manel Boujelben, Anis Koubâa and Mohamed Abid, “A Lightweight User Authentication Scheme for Wireless Sensor Networks”, The First ACS/IEEE Workshop Future Trends on Ad-hoc and Sensor Networks (FT-ASN 2010), Hammamet, Tunisia, May 16-19, 2010.

3. Omar Cheikhrouhou, Manel Boujelben, Anis Koubâa, Mohamed Abid, Attacks and Improvement of "Security Enhancement for a Dynamic ID-based Remote User Authentication Scheme" The 7th ACS/IEEE International Conference on Computer Systems and Applications (AICCSA09), Rabat, Morocco. May 10-13, 2009.

4. Manel Boujelben, Omar Cheikhrouhou, Habib Youssef, Mohamed Abid, A Pairing Identity based Key Management Protocol for Heterogeneous Wireless Sensor Networks, International Conference on Network and Service Security. France, 24-26 June 2009.

5. Manel Boujelben, Omar Cheikhrouhou, Habib Youssef, Mohamed Abid, Establishing pairwise keys in heterogeneous two-tiered wireless sensor networks, Third International Conference on Sensor Technologies and Applications . Greece, 18-23 June 2009.

PhD Project: On the Adequacy of 6lowpan for Wireless Sensor Networks.


Student: Olfa Gaddour.

Start date: 2010.

Expected end: 2013.



Abstract. The vision towards large-scale distributed computing systems is currently evolving to a new frontier, where computation is no longer decoupled from its environment. This sight stems from the need to integrate external physical data and processes with computations for sake of pervasive and ubiquitous control of the surrounding environment. The Wireless Sensor Networks (WSNs) paradigm has emerged as a promising alternative to networks of physical events, which supports the control and monitoring of physical phenomena in the environment through sensing. WSNs are considered as one the main technologies that gave rise to the concept of Cyber-Physical Systems (CPS), which are systems deployed in large geographical areas and generally consist of a massive number of distributed computing devices tightly coupled with their physical environment

Building large scale cyber-physical systems is nowadays one of the hottest challenges in research. There have been several protocols that were developed to support the vision of large scale CPS. One very promising technology is 6lowpan, which consists in integrating the IPv6 network layer on top of IEEE 802.15.4 MAC layer, as a complete protocol stack for tiny sensor nodes. This integration enables the interoperability with the Internet, which enable to deploy, monitor wireless sensor networks as large-scale.

Main Objectives

While 6lowpan is considered as the most promising technology for enabling such a large scale deployment and interoperability, there are several issues that need to be addressed to ensure its adequacy with WSNs requirements, mainly in terms of energy and limited resources of sensor nodes.

In addition, it is important to investigate the potential of 6lowpan to provide QoS and real-time guarantees. All these issues have not been addressed so far in the literature. Performance evaluation studies and adequate models for 6lowpan must be defined to assess the behavior of 6lowpan and its suitability to meet WSN requirements.

In summary, the objective of this PhD project is to respond to the following question: to which extend 6lowpan is efficient for supporting the applications of WSNs.

PhD Project: Re-Think the Hardware/Software Co-Design for Cyber-Physical Systems.


Student: Wassim Jmal.

Start date: 2008.

Expected end: 2012.



Abstract. A Cyber-Physical System (CPS) is any automation system that ensures the monitoring and the control of a physical process. Example of applications includes Industrial Control Systems, Health Care Monitoring Systems, and Transportation Control Systems, etc. The Wireless Sensor Network (WSN) paradigm is an enabling technology for cyber-physical applications since it sensor nodes are devices that interact with the physical world to collect data, make processing and communication together.

Very recent research works have been investigating the re-design of computation foundations to fit the requirements of Cyber-Physical Systems. One of the research directions mentioned in [1] is to re-think on the design abstractions for hardware/software that interacts with physical systems. In fact, Cyber-physical systems intrinsically combine hardware and physical systems with software. However, current hardware/software design methodologies do not take into account the close interaction of the hardware with physical systems.

The purpose of this PhD is to define a framework for Hardware/Software Co-Design taking into account the requirements of Cyber-Physical Systems. We expect to implement a prototype for ZigBee applications.

The PhD work can be scheduled in the following steps:

• State-of-the-art on Cyber-Physical Systems and their requirements, and Hardware/Software co-design with physical interaction.

• Specification of a framework for hardware/software co-design for cyber-physical systems: the framework should define an abstract architecture suitable for cyber-physical systems.

• Implementation and validation of the prototype on a real system, for ZigBee applications. • Comparative performance evaluation with other platforms/frameworks.

PhD Project: Mobility in Wireless Sensor Networks

Role: Co-Supervisor with Pr. Mario Alves.

Student: Hossein Fotouhi.

Start date: 2009. Expected end: 2013.

University: National Polytechnic Institute of Porto, Portugal.

Research Units Involved: CISTER Research Unit.

Abstract. The main objective is to support mobility in (low-power, large-scale, dense) cooperating objects/wireless sensor networks in a way that reliable and real-time communications are supported. This means taking reliable hand-off decisions (if/when and to which access point to hand-off) and find the appropriate (re-routing/re-addressing) mechanisms in a way that messages are not lost nor have unacceptable delays. For this to happen, network inaccessibility times of mobile nodes must be zero or at least bounded. We envisage the following tasks:

1. design reliable hand-off schemes, both for individual nodes mobility and for node groups mobility (e.g. BSN, vehicle, mobile robot) mobility

2. design re-routing/re-addressing schemes upon mobility (again for individual nodes and node groups) in a way that network inaccessibility times are 0 or at least bounded

3. design real-time and reliable resource allocation and admission control mechanisms

Other aspects that can be explored are related to designing real-time, reliable radio link quality and interference estimation techniques, involving issues such as radio interference estimation and radio resource management (estimate radio link quality and radio channel interference, as well as transceiver transmit/receive (TX/RX) power and frequency management, for supporting optimal handoff and channel switching decisions).

Related Publications Hossein Fotouhi, Mário Alves, Anis Koubâa, Nouha Baccour, On a Reliable Handoff Procedure for Supporting Mobility in Wireless Sensor Networks, the 9th International Workshop on Real-Time Networks (RTN'2010), co-located with the 22th Euromicro Int. Conference on Real-Time Systems, July 2010, Brussels, Belgium.

MM AASSTTEERR SSUUPPEERRVVII SSII NNGG AACCTTII VVII TTII EESS ((NNOOTT CCOOMM PPLL EETTEE))

Master Project: On the use of IEEE 802.15.4/ZigBee for Time-Sensitive WSN Applications (received the Best M.Sc. Award, in the European CONET/EWSN 2009 conference). Role: Co-Supervisor with Pr. Mario Alves.

Student: Ricardo Severino.

Start date: 2008. Defended on: Oct. 2008.



Recent advancements in information and communication technologies are paving the way for new paradigms in embedded computing systems. This, allied with an increasing eagerness for monitoring and controlling everything, everywhere, is pushing forward the design of new Wireless Sensor Network (WSN) infrastructures that will tightly interact with the physical environment, in a ubiquitous and pervasive fashion. Such cyber-physical systems require a rethinking of the usual computing and networking concepts, and given that the computing entities closely interact with their environment, timeliness is of increasing importance. This Thesis addresses the use of standard protocols, particularly IEEE 802.15.4 and ZigBee, combined with commercial technologies as a baseline to enable WSN infrastructures capable of supporting the Quality of Service (QoS) requirements (specially timeliness and system lifetime) that future large-scale networked embedded systems will impose. With this purpose, in this Thesis we start by evaluating the network performance of the IEEE 802.15.4 Slotted CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism for different parameter settings, both through simulation and through an experimental test-bed. In order to improve the performance of these networks (e.g. throughput, energy-efficiency, message delay) against the hidden-terminal problem, a mechanism to mitigate it was implemented and experimentally validated. The effectiveness of this mechanism was also demonstrated in a real application scenario, featuring a target tracking application. A methodology for modeling cluster-tree WSNs and computing the worst-case end-to-end delays, buffering and bandwidth requirements was tested and validated experimentally. This work is of paramount importance to understand the behavior of WSNs under worst-case conditions and also to make the appropriate network settings. Our experimental work enabled us to identify a number of technological constrains, namely related to hardware/software and to the Open-ZB implementation in TinyOS. In this line, a new implementation effort was triggered to port the Open-ZB IEEE 802.15.4/ZigBee protocol stack to the ERIKA real-time operating system. This implementation was validated experimentally and its behavior compared with the TinyOS–based implementation. Keywords: Wireless Sensor Networks; Cluster-Tree WSN; Real-Time Communications; Quality of Service; IEEE 802.15.4; ZigBee; TinyOS; ERIKA.

Master Project: SeGCom: The Secure Group Communication Mechanism in Wireless Sensor Networks

Role: Main Supervisor with Pr. Mohamed Abid

Student: Olfa Gaddour.

Start date: 2008.

Defended on: 15 September 2009.



Abstract. Security is a challenging issue in Wireless Sensor Networks (WSNs) due to the dual impact of their inherent constraints and their operation in open and harsh environments. The problem of securing a WSN becomes even more complex when considering group communications. In this Thesis, we address this problem and propose a new security mechanism for group communications in cluster-tree WSNs. We define a group as a set of sensor nodes in the cluster-tree network sharing the same sensory information (e.g. temperature, pressure, etc.).

Our objective is to limit the access to the group data exclusively to the members that have securely joined the group. The main contributions of the Thesis are the proposal of an efficient and secure group management mechanism for cluster-tree networks, a multicast routing scheme to manage communication between group members and a secure key distribution between group members. Finally, our security analysis shows that the proposed scheme is efficient and secure.

Related Publications. 1. Olfa Gaddour, Anis Koubâa, Omar Cheikhrouhou, Mohamed Abid, “Z-Cast: A Multicast Routing

Mechanism in ZigBee Cluster-Tree Wireless Sensor Networks” Third International Workshop on Sensor Networks (SN 2010) in conjunction with IEEE ICDCS 2010, Genoa, Italy, June 21-25, 2010.

2. Olfa Gaddour, Anis Koubâa, Mohamed Abid, “SeGCom: The Secure Group Communication Mechanism in Wireless Sensor Networks” The First International Conference on Communications and Networking (ComNet’09), Hammamet, Tunisia, Nov 2009.

Master Project: A Framework for Benchmarking Link Quality Estimators In Wireless Sensor Networks. (received the Best M.Sc. Award, in the European CONET/EWSN 2011 conference). Role: Co-Supervisor with Pr. Mohamed Jmail.

Student: Maissa ben Jamaa.

Start date: 2009. Defended on: 27 July. 2010.


International Collaboration with: RedCad Research Unit (Tunisia).

Abstract. In this master thesis we have conducted a performance evaluation of a set of most reputed LQEs and we tried to optimize F-LQE (a recently proposed LQE) performance. Our experimental methodology is split into two phases: the first one consists in studying the statistical properties of LQEs, and the second one consists in investigating their impact on higher layer protocols. The selected routing protocol was CTP as it relies on link quality estimation to build its routes. For the first phase of the experimental study, we were invited to implement a test-bed called RadiaLE aiming at automating the performance evaluation of the statistical properties of different LQEs. RadiaLE and F-LQE statistical validation was subject of several publications in well ranked conferences. In the second study, we performed our experiments using simulation and real experimentation. Simulation provides a rapid prototyping solution but it lacks accuracy as it usually relies on simplified and stochastic models. In contrast, real experimentation provides much more accuracy and fidelity. Simulations were done under TOSSIM simulator and Real experimentations were done on MOTELAB test-bed in order to perform large-scale experiments. Our results show that Four-bit is the most powerful estimator. However, by applying some optimization levels on FLQE implementation, FLQE remains also a good estimator. Roughly the best estimators are Four-bit, FLQE WMEWMA and ETX. In our study, we only investigated LQEs impact on routing context, we plan in our future works investigating their impact in other higher layers protocol such those used for mobility managing.

Related Publications 1. Nouha Baccour, Maissa Ben Jamaa, Denis do Rosario, Anis Koubaa, Habib Youssef, Mario Alves and

Leandro B. Becker. A TestBed for the Evaluation of Link Quality Estimators in Wireless Sensor Networks, The ACS/IEEE Workshop Future Trends on Ad-hoc and Sensor Networks (FT-ASN 2010), Tunisia, May 16-19, 2010.

2. Nouha Baccour, Anis Koubâa, Habib Youssef, Maissa Ben Jamâa, Denis do Rosario, Mario Alves and Leandro Becker. F-LQE: A Fuzzy Link Quality Estimator for Wireless Sensor Networks, The 7th European Conference on Wireless Sensor Networks (EWSN 2010), Coimbra, Portugal, September 17-19, 2010. (Acceptance ratio: 19%).

3. Nouha Baccour, Maissa Ben Jamaa, Denis do Rosario, Anis Koubaa, Mario Alves, Leandro B. Becker, Habib Youssef, and Hossein Fotouhi. Demo Abstract: RadiaLE: a framework for benchmarking link quality estimators, The 7th European Conference on Wireless Sensor Networks (EWSN 2010), Coimbra, Portugal, September 17-19, 2010.

4. Nouha Baccour, Anis Koubâa, Maissa Ben Jamâa, Habib Youssef, Marco Zuniga, and Mario Alves A Comparative Simulation Study of Link Quality Estimators in Wireless Sensor Networks 17th Annual Meeting of the IEEE International Symposium on Modelling, Analysis and Simulation of Computer and

Telecommunication Systems (MASCOTS 2009), South Kensington Campus, Imperial College London, September 21-23, 2009 (Acceptance ratio for extended papers: 20%).

5. Maissa Ben Jamaa, Nouha Baccour, Anis Koubaa, Denis do Rosarioy, Mario Alves, Leandro Becker, Habib Youssef, and Mohamed Jmaiel. Demo Abstract: A TestBed for the evaluation of Link Quality Estimators in WSNs, The First International School on Cyber-Physical and Sensor Networks (SensorNets 2009), Monastir, Tunisia, December 17-22 2009. (Best Demo Award).

Master Project: On the use of IEEE 802.15.4/ZigBee as federating communication protocols for Wireless Sensor Networks.

Role: Co-Supervisor with Pr. Mario Alves.

Student: Andre Cunha.

Start date: 2006. Defended on: Sept. 2007.


International Collaboration with: RedCad Research Unit (Tunisia). Abstract. We are witnessing the dawn of a new paradigm in Information and Communication Technologies (ICT), where large-scale embedded computing systems will interact with the physical environment in a ubiquitous and pervasive fashion. The landscape of potential new applications is tremendous; homeland security, environmental monitoring, health care, domotics, or factory automation are just a few elucidative examples of how these emerging embedded technologies will impact our daily life and society at large. In order for these applications to become a reality, it is mandatory to find adequate Wireless Sensor Network (WSN) infrastructures that comply with complex requirements. In this context, IEEE 802.15.4/ZigBee seems potentially interesting to act as federating communication protocols for WSNs. Nevertheless, several issues in the standard specifications are still open. The main research objectives of this Thesis are to evaluate the adequateness of the IEEE 802.15.4/ZigBee protocols for supporting WSN applications, the identification of open issues in the standard specifications and the proposal of solutions to effectively solve some of these problems and to enhance some native mechanisms. For this purpose, an implementation of the IEEE 802.15.4/ZigBee protocol stack under the TinyOS operating system was conducted. This protocol stack has been used to leverage our research work, in the sense that it has been enabling the test, validation and demonstration of our scientific findings through experimentation. This work has also been driven by the need for an open-source implementation of the IEEE 802.15.4/ZigBee protocols, filling a gap between some newly released complex C implementations and black-box implementations from different manufacturers. The problem of building synchronized cluster-tree networks, which are quite suitable for ensuring real-time and energy-efficient communications, is also addressed by this Thesis, demonstrating the feasibility of the Time Division Beacon Scheduling approach. Reliability is also an important aspect in WSN applications, particularly those with critical requirements. ZigBee Cluster-Tree networks are prone to the single point of failure problem in the ZigBee Routers (cluster-heads). This Thesis presents a mechanism that improves on the ZigBee default behaviour by reducing or even eliminating network inaccessibility times in case of ZigBee Router failure. Additionally, timeliness is an important feature of the IEEE 802.15.4 protocol, turning it quite appealing for applications under timing constraints. The native (explicit) Guaranteed Time Slot (GTS) allocation mechanism may be inefficient concerning bandwidth utilization. Thus, an implicit allocation mechanism (i-GAME) was implemented and proved to overcome that problem, by allowing several nodes to share the same GTS. Finally, this Thesis presents a performance evaluation of the slotted CSMA/CA mechanism, comparing experimental and simulation results. Keywords: Wireless Sensor Networks; IEEE 802.15.4; ZigBee; TinyOS; ZigBee Cluster-Tree Topologies; Real-Time Communications; Fault-Tolerance.

Related Publications • Anis Koubâa, Andre Cunha, Mario Alves, Eduardo Tovar "TDBS: a time division beacon scheduling

mechanism for ZigBee cluster-tree wireless sensor networks" Published in Springer Real-Time Systems Journal, Volume 40, Number 3, pp 321 - 354, Springer, October 2008. Impact factor: 1.48

• Andre Cunha, Anis Koubâa, Ricardo Severino, Mário Alves, "Open-ZB: an open-source implementation of the IEEE 802.15.4/ZigBee protocol stack on TinyOS" The Fourth IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS07), Pisa(Italy), 8 - 11 October 2007, (5% acceptance on Extended papers).

• Anis Koubaa, Andre Cunha, Mário Alves, “A Time Division Beacon Scheduling Mechanism for IEEE 802.15.4/Zigbee Cluster-Tree Wireless Sensor Networks”, Euromicro Conference on Real-Time Systems (ECRTS 2007), Pisa (Italy), July 2007. (Best Paper Award)

PPUUBBLL II CCAATTII OONNSS

ا�بحاث المنشورة

.ورقة علمية في مؤتمرات ومج!ت علمية دولية مختلفة وذات سمعة محترمة وفصول في كتب علمية 60أكثر من

Books

.2010جامعة ا,مام، ، عمارتھا وتطبيقاتھا: شبكات الحساسات ال�سلكية، وسام بن فرج، أنيس قوبعة [1]

[2] Anis Koubaa, (Editor), Proceedings of the 7th Workshop on Real-Time Networks (RTN'08), Prague, Czech Republic, July 1, 2008, ISBN: 978-972-8688-59-2.

Book Chapters

[3] The CONET Consortium (co-author), Cooperating Objects Roadmap 2009 1st Edition Logos Verlag, June 2009. Main contributions: Sections 3.3, 6.1.3 and 6.2.3. Available for download at http://www.cooperating-objects.eu/roadmap/download/

[4] Anis Koubaa, Mario Alves, Eduardo Tovar, The IEEE 802.15.4: A Federating Technology for Time-Sensitive Wireless Sensor Networks, invited submission in Sensor Network and Configuration: Fundamentals, Techniques, Platforms, and Experiments, (Elsevier), ISBN 987-3-540-37364-3, 2007.

[5] Ye-Qiong SONG, Anis Koubaa, Jian LI, Qualité de service temps réel selon le modèle (m,k)-firm, à paraître dans l'ouvrage Les Systèmes Temps Réels: Ordonnancement, Réseaux et Qualité de Service, Vol. II, Traité I2C, (Hermès), 2006.

International Journals

[6] Nouha Baccour, Anis Koubâa, Maissa Ben Jamâa, Denis do Rosario, Habib Youssef, Mario Alves and Leandro Becker. “RadiaLE: a Framework for Designing and Assessing Link Quality Estimators in Wireless Sensor Networks”, to appear in Ad Hoc Networks Journal, Elsevier, 2011.

(Impact Factor = 1,293, 2009)

[7] M. Rouached, S. Chaudhry and A. Koubaa. "Service-Oriented Architecture Meets LowPANs: a Survey", The International Journal of Ubiquitous Systems and Pervasive Networks (JUSPN), Issue 1, Volume 1, 2011 (to appear)., Vol. 1. 2011. (invited and peer-reviewed paper)

[8] Omar Cheikhrouhou, Anis Koubaa, Gianluca Dini, Mohamed Abud, “RiSeG: A Logical Ring-based Secure Group Communication Protocol for Wireless Sensor Networks”, accepted for publication in Springer Journal Personal and Ubiquitous Computing, 2011 (Impact Factor = 1,554, 2009)

[9] Petr Jurčík, Anis Koubâa, Ricardo Severino, Mário Alves, Eduardo Tovar, Hanzalek Zdenek " Dimensioning and Worst-case Analysis of Cluster-Tree Sensor Networks" in ACM Transactions on Sensor Networks, August 2010.

Impact factor (in 2009): 1.96 http://www.scimagojr.com/journalsearch.php?q=4700152843&tip=sid&clean=0 [10] Anis Koubâa, R. Severino, M. Alves, E. Tovar, “Improving Quality-of-Service in Wireless Sensor

Networks by mitigating hidden-node collisions”, IEEE Transactions on Industrial Informatics, Special Issue on Real-Time and Embedded Networked Systems, Volume 5, Number 3, August 2009. Impact factor: 2.356

[11] Anis Koubâa, Andre Cunha, Mario Alves, Eduardo Tovar "TDBS: a time division beacon scheduling mechanism for ZigBee cluster-tree wireless sensor networks" Published in Springer Real-Time Systems Journal, Volume 40, Number 3, pp 321 - 354, Springer, October 2008. Impact factor: 1.48

[12] Anis Koubâa, Mario Alves, Eduardo Tovar "i-GAME: An Implicit GTS Allocation Mechanism in IEEE 802.15.4, theory and practice" Real-Time System Journal, Springer Real-Time Systems Journal, Volume 39, Numbers 1-3, pp 169 - 204, Springer, August 2008. Impact factor: 1.48

[13] Anis Koubaa, Mário Alves, Eduardo Tovar, “Energy/Delay Trade-off of the GTS Allocation Mechanism in IEEE 802.15.4 for Wireless Sensor Networks”, In Wiley Journal of Communication Systems, special issue on Energy-Efficient Network Protocols and Algorithms for Wireless Sensor Networks, 2006.

[14] Anis Koubaa, Ye-Qiong SONG, “Graceful Degradation of Loss-Tolerant QoS using (m,k)-Firm Constraints in Guaranteed Rate Networks”, Computer Communications Journal, (Elsevier), Vol 28/12, pp 1393-1409, July 2005.

[15] Anis Koubaa, Ye-Qiong SONG, “Evaluation and Improvement of Response Time Bounds for Real-Time Applications under Non-Preemptive Fixed Priority Scheduling”, International Journal of Production and Research IJPR (Taylor & Francis), Vol. 42, No. 14, pp. 2899-2913, July 2004.

French Written Journals

[16] Anis Koubaa, Ye-Qiong SONG, Jean-Pierre THOMESSE, « (m,k)-WFQ: Intégration des contraintes temporelles (m,k)-Firm dans les réseaux à débit garanti », Papier de la conférence RTS’2004 sélectionné pour une publication dans le journal Technique et Science Informatiques (TSI), 2006.

International Conference – Regular Papers

[17] Olfa Gaddour, Anis Koubâa, Omar Cheikhrouhou, Mohamed Abid, “Z-Cast: A Multicast Routing Mechanism in ZigBee Cluster-Tree Wireless Sensor Networks” Third International Workshop on Sensor Networks (SN 2010) in conjunction with IEEE ICDCS 2010, Genoa, Italy, June 21-25, 2010.

[18] N. Baccour, A. Koubâa, H. Youssef, M. Jamâa, D. Rosario, M. Alves, L. Becker, F-LQE: A Fuzzy Link Quality Estimator for Wireless Sensor Networks, 7th European Conference on Wireless Sensor Networks (EWSN 2010), Coimbra, Portugal, Feb 17-19, 2010

19% of acceptance ratio

[19] N. Baccour, A. Koubâa, H. Youssef, M. Jamâa, D. Rosario, M. Alves, L. Becker, A TestBed for the evaluation of Link Quality Estimators in Wireless Sensor Networks, The First ACS/IEEE Workshop Future Trends on Ad-hoc and Sensor Networks (FT-ASN 2010), Hammamet, Tunisia, May 16-19, 2010.

[20] Omar Cheikhrouhou, Manel Boujelben, Anis Koubâa and Mohamed Abid, “A Lightweight User Authentication Scheme for Wireless Sensor Networks”, The First ACS/IEEE Workshop Future Trends on Ad-hoc and Sensor Networks (FT-ASN 2010), Hammamet, Tunisia, May 16-19, 2010.

[21] Petr Jurčík, Anis Koubâa, Mário Alves, Eduardo Tovar " On the Capacity of Cluster-tree ZigBee Networks" Cognitive systems with Interactive Sensors (RTCSA 2008), Paris, France, 16 - 18 November 2009.

[22] Thiemo Voigt, Joakim Eriksson, Fredrik Österlind Robert Sauter, Nils Aschenbruck, Pedro J. Marrón, Vinny Reynolds, Lei Shu, Otto Visser, Anis Koubâa, Andreas Köpke, Towards Comparable Simulations of Cooperating Objects and Wireless Sensor Networks” 1st International Workshop on Performance Methodologies and Tools for Wireless Sensor Networks (WSNperf), Pisa, Italy, October 23, 2009.

[23] Olfa Gaddour, Anis Koubâa, Mohamed Abid, “SeGCom: The Secure Group Communication Mechanism in Wireless Sensor Networks” The First International Conference on Communications and Networking (ComNet’09), Hammamet, Tunisia, Nov 2009.

[24] N. Baccour, Anis Koubaa, M. Jamâa, H. Youssef, M. Zuniga, M. Alves, “A Comparative Simulation Study of Link Quality Estimators in Wireless Sensor Networks”, 17th IEEE/ACM International Symposium on Modelling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS'09), Imperial College London, UK, September 21-23, 2009.

Selected (top 20%) to be published as an *** Extended Paper ***

[25] Anis Koubâa, Ricardo Severino, Mario Alves, Eduardo Tovar, “H-NAMe: A Hidden-Node Avoidance Mechanism for Wireless Sensor Networks”, 8th IFAC International Conference on Fieldbuses and Networks in Industrial and Embedded Systems (FET'09), Ansan, Republic of Korea, May 2009.

[26] Omar Cheikhrouhou, Manel Boujelben, Anis Koubâa, Mohamed Abid, Attacks and Improvement of "Security Enhancement for a Dynamic ID-based Remote User Authentication Scheme" The 7th ACS/IEEE International Conference on Computer Systems and Applications (AICCSA09), Rabat, Morocco. May 10-13, 2009.

[27] Jamila Ben Slimane, Ye-Qiong Song, Anis Koubâa, Mounir Frikha “Three-Tiered Architecture for Large-Scale Wireless Hospital Sensor Networks”,The First International Workshop on Mobilizing Health Information to Support Healthcare-related Knowledge Work – MobiHealthInf, Porto, Portugal, 2009.

[28] Petr Jurčík, Ricardo Severino, Anis Koubâa, Mário Alves, Eduardo Tovar "Real-Time Communications over Cluster-Tree Sensor Networks with Mobile Sink Behaviour" the 14th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA 2008), Kaohsiung, Taiwan, 25 - 27 August 2008.

[29] Petr Jurcik, Anis Koubâa, Mário Alves, Eduardo Tovar, Hanzalek Zdenek, "A Simulation Model for the IEEE 802.15.4 Protocol:Delay/Throughput Evaluation of the GTS Mechanism" the 15th IEEE International Symposium on Modeling, Analysis, and Simulation of Computer and Telecommunication Systems (MASCOTS'07), Bogazici University, Istanbul (Turkey), 24 - 26 October 2007.

[30] Andre Cunha, Anis Koubâa, Ricardo Severino, Mário Alves, "Open-ZB: an open-source implementation of the IEEE 802.15.4/ZigBee protocol stack on TinyOS" The Fourth IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS07), Pisa(Italy), 8 - 11 October 2007, (5% acceptance on Extended papers).

[31] Anis Koubaa, Andre Cunha, Mário Alves, “A Time Division Beacon Scheduling Mechanism for IEEE 802.15.4/Zigbee Cluster-Tree Wireless Sensor Networks”, Euromicro Conference on Real-Time Systems (ECRTS 2007), Pisa (Italy), July 2007. Best Paper Award

[32] Anis Koubaa, Mario Alves, Melek Attia, Anneleen Van Nieuwenhuyse, “Collision-Free Beacon Scheduling Mechanisms for IEEE 802.15.4/Zigbee Cluster-Tree Wireless Sensor Networks”, The 7th International Workshop on Applications and Services in Wireless Networks (ASWN2007), Santander (Spain), May 2007.

[33] Anis Koubaa, Mário Alves, Eduardo Tovar, “Modeling and Worst-Case Dimensioning of Cluster-Tree Wireless Sensor Networks”, In Proc. of IEEE Real-Time System Symposium (RTSS'06), Rio de Janeiro (Brazil), Dec. 2006. (the most important conference in Real-Time Systems)

[34] Anis Koubaa, Mário Alves, Eduardo Tovar, “IEEE 802.15.4: a wireless communication technology for large-scale ubiquitous computing applications”, In Proc. of Conference on Mobile and Ubiquitous Systems (CSMU 2006), Guimaraes, June 29-30, 2006.

[35] Anis Koubaa, Mário Alves, Eduardo Tovar, "A Comprehensive Simulation Study of Slotted CSMA/CA for IEEE 802.15.4 Wireless Sensor Networks" in IEEE WFCS 2006, Torino (Italy), June 2006.

[36] Anis Koubaa, Mário Alves, Eduardo Tovar, "i-GAME: An Implicit GTS Allocation Mechanism in IEEE 802.15.4", to appear in 18th Euromicro Conference on Real-Time Systems (ECRTS 06) (the most important conference in Real-Time Systems in Europe), Jul. 2006. Acceptance rate = 25%

[37] Anis Koubaa, Mário Alves, Eduardo Tovar, "GTS Allocation Analysis in IEEE 802.15.4 for Real-Time Wireless Sensor Networks", to appear in 14th International Workshop on Parallel and Distributed Real-Time Systems (WPDRTS 2006), invited paper in the special track on Wireless Sensor Networks, Apr. 2006.

[38] Anis Koubaa, Ye-Qiong SONG, “Loss-Tolerant QoS using Firm Constraints in Guaranteed Rate Networks”, Proc. of the 10th IEEE Real-Time and Embedded Technology and Applications (RTAS'2004), Toronto (Canada), pp. 526-533, 25-28 May 2004. Acceptance rate = 30%

[39] Anis Koubaa, Ye-Qiong SONG, “(m,k)-WFQ: Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks”, Proceedings of Real Time Systems Conference RTS'2004, Paris (France), pp. 35-60, 30 Mars-1 Avril 2004. Acceptance rate = 50%

[40] Enrico POGGI, Ye-Qiong SONG, Anis Koubaa, Zhi WANG, “Matrix-DBP for (m, k)-firm Real Time Guarantee”, Proceedings Real Time Systems Conference RTS'2003, Paris (France), 1-3 Avril 2003.

[41] Anis Koubaa, Ye-Qiong SONG « Amélioration des Délais dans les Réseaux à Débits Garantis pour des Flux Temps-Réel Sous Contrainte (m,k)-Firm », Conférence Internationale Sciences Electroniques, Technologies de l'Information et des Télécommunications SETITE'2003 Sousse (Tunisie), 17-21 Mars 2003.

[42] Ye-Qiong SONG, Anis Koubaa, François SIMONOT, “Switched Ethernet For Real-Time Industrial Communication: Modelling And Message Buffering Delay Evaluation”, 4rd IEEE International Workshop on Factory Communication Systems, Sweden, pp. 27-36, Aug. 2002

[43] Anis Koubaa, Ye-Qiong SONG, « Evaluation de performances d'Ethernet commuté pour des applications temps réel », Proc. of RTS’2002, Paris (France), 26-28 Mars 2002.

International Conference – Short Papers

[44] Nouha Baccour, Maissa Ben Jamaa, Denis do Rosario, Anis Koubaa, Mario Alves, Leandro B. Becker, Habib Youssef, and Hossein Fotouhi. Demo Abstract: RadiaLE: a framework for benchmarking link quality estimators, The 7th European Conference on Wireless Sensor Networks (EWSN 2010),

Coimbra, Portugal, September 17-19, 2010.

[45] Maissa Ben Jamaa, Nouha Baccour, Anis Koubaa, Denis do Rosarioy, Mario Alves, Leandro Becker, Habib Youssef, and Mohamed Jmaiel. Demo Abstract: A TestBed for the evaluation of Link Quality Estimators in WSNs, The First International School on Cyber-Physical and Sensor Networks (SensorNets 2009), Monatir, Tunisia, December 17-22 2009. (Best Demo Award)

[46] Anis Koubâa, Bjorn Andersson, "A Vision of Cyber-Physical Internet", In Proc. of the Workshop of Real-Time Networks (RTN 2009), Satellite Workshop to (ECRTS 2009), July 2009.

[47] Skender Ben Attia, André Cunha, Anis Koubâa, Mário Alves, "Fault-Tolerance Mechanisms for Zigbee Wireless Sensor Networks" Work-in-Progress (WiP) session of the 19th Euromicro Conference on Real-Time Systems (ECRTS 2007), Pisa, Italy, July 2007.

[48] Anis Koubaa, Mário Alves, B. Nefzi, Y. Q. Song, “Improving the IEEE 802.15.4 Slotted CSMA/CA MAC for Time-Critical Events in Wireless Sensor Networks”, In Proc. of the Workshop of Real-Time Networks (RTN 2006), Satellite Workshop to (ECRTS 2006), July 2006.

[49] Mário Alves, Anis Koubaa, A. Cunha, R. Severino, E. Lomba, “On the Development of a Test-Bed Application for the ART-WiSe Architecture”, In Euromicro Conference on Real-Time Systems (ECRTS 2006), (WiP Session), July 2006.

[50] Anis Koubaa, Mario Alves, "A Two-Tiered Architecture for Real-Time Communications in Large-Scale Wireless Sensor Networks: Research Challenges", In Proc. of 17th Euromicro Conference on Real-Time Systems (ECRTS'05), WiP Session, Palma de Mallorca (Spain), 5-7 July, 2005.

[51] Anis Koubaa, Ye-Qiong SONG, Jean-Pierre THOMESSE, “Integrating (m,k)-Firm Real-Time Guarantees in the Internet QoS Model”, In the LNCS 4th IFIP Networking Conference Networking '2004 Athens (Greece), 9-14 May 2004. Acceptance rate = 26%

[52] Anis Koubaa, Aref JARRAYA, Ye-Qiong SONG “SBM protocol for providing real-time QoS in Ethernet LANs”, 1st Intl. Workshop on Real-Time LANs in the Internet Age (Satellite Event to ECRTS'02), Austria, Juin 2002.

FFRREENNCCHH CCOONNFFEERREENNCCEESS

[53] Anis Koubaa, Ye-Qiong SONG « Evaluation et Amélioration des Bornes du Temps de Réponse pour des Applications Temps Réel avec Ordonnancement à Priorité Fixe et Non-Préemptif », Le 4ième Colloque Francophone sur la Modélisation des Systèmes Réactifs, MSR'03, Metz (France), Oct. 2003.

This paper has been selected for publication in IJPR journal (publication [2])

Technical Reports

[54] Andre Cunha, Anis Koubaa, Mario Alves

Implementation Details of the Time Division Frame Scheduling Approach for Zigbee Cluster-Tree Networks

IPP-HURRAY Technical Report, HURRAY-TR-070102, Jan 2007

[55] Andre Cunha, Anis Koubaa, Mario Alves

An IEEE 802.15.4 protocol implementation(in nesC/TinyOS): Reference Guide v1.1

IPP-HURRAY Technical Report, HURRAY-TR-061106, Nov 2006

[56] Melek Attia, Anis Koubaa, Mário Alves, Anneleen Van Nieuwenhuyse

Collision-Free Beacon Scheduling Mechanisms for IEEE 802.15.4/Zigbee Cluster-Tree Wireless Sensor Networks IPP-HURRAY Technical Report, HURRAY-TR-061104, Nov 2006

[57] Melek Attia, Anis Koubâa, Mário Alves

Beacon scheduling in cluster-tree IEEE 802.15.4/ZigBee Wireless Sensor Networks

IPP-HURRAY Technical Report, HURRAY-TR-060604, Jun 2006

[58] Anneleen Van Nieuwenhuyse, Anis Koubaa, Mário Alves

On the use of the ZigBee protocol for Wireless Sensor Networks

IPP-HURRAY Technical Report, HURRAY-TR-060603, Jun 2006

[59] Anis Koubaa, Mário Alves, Eduardo Tovar

On the Performance Limits of Slotted CSMA/CA in IEEE 802.15.4 for Broadcast Transmissions in Wireless Sensor Networks

IPP-HURRAY Technical Report, HURRAY-TR-060401, Apr 2006

[60] Anis Koubaa, Mario Alves, Eduardo Tovar, " Lower Protocol Layers for Wireless Sensor Networks: A Survey", HURRAY Technical Report, TR-HURRAY-051101, Nov. 2005.

[61] Anis Koubaa, Mario Alves, Eduardo Tovar, "A Real-Time Sensor Network Architecture with Power-Efficient Resource Reservation in IEEE 802.15.4", HURRAY Technical Report, TR-HURRAY-050801, Aug. 2005.

[62] Anis Koubaa, Mario Alves, Eduardo Tovar, "IEEE 802.15.4 for Wireless Sensor Networks: A Technical Overview" IPP-HURRAY Technical Report, HURRAY-TR-050702, July 2005.

[63] Anis Koubaa, "Evaluation de performances d'Ethernet commuté pour des applications temps réel", rapport de DEA, UHP Nancy I, LORIA-TRIO, July 2001

[64] Anis Koubaa, "Simulation du Protocole de Sécurité Multicast GKMP", Rapport de fin d'études d'ingénieurs, LORIA-RESEADAS, July 2000.

PhD Thesis

[65] Anis Koubaa, Gestion de la Qualité de Service temporelle selon la contrainte (m,k)-firm dans les réseaux à commutation de paquets, Thèse INPL, Oct. 2004.

SSUUMM MM EERR SSCCHHOOOOLL AANNDD NNOONN RREEFFEERREEEEDD CCOONNFFEERREENNCCEESS

[66] Yé-Qiong SONG, Anis Koubaa « Gestion Dynamique de la QdS Temps-Réel Selon (m,k)-Firm » Ecole Temps-Réel, ETR'03, Toulouse (France), 9-12 Septembre 2003.

[67] Anis Koubaa, Ye-Qiong SONG «Intégration des garanties temporelles (m,k)-firm dans les ordonnanceurs WFQ pour les réseaux temps réel », 3ème Journées Scientifiques Des Jeunes Chercheurs En Génie Electrique et Informatique, GEI 2003 Mahdia, Tunisie, 16/19 Mars 2003.

دولية مج�ت عربية

، المجلة الدولية دراسة تجريبية لتقدير جودة الوص�ت في شبكات الحساسات ال�سلكيةأنيس قوبعة، .د [68] .2010يونيو ، 4ISSN 1090-102Xتصا4ت الجمعية العربية للحاسبات، المجلد الثالث، العدد ا1ول،

، في تطبيقات الحج والعمرة لجمع المعلوماتكتقنية نحو استخدام شبكات الحّساسات ال�سلكيةأنيس قوبعة، . د [69] .2010مجلة دراسات المعلومات، العدد السادس، المجلد ا1ول،

مؤتمرات عربية

، نحو نظام آلي متطور خاص بالمناسك في البقاع المقدسة باستخدام شبكات حسن الص!ي. ، دانيس قوبعة. د [70].1428الملتقى العلمي الثامن 1بحاث الحج والعمرة، مكة المكرمة، ذوالقعدة الحّساسات ال�سلكية

تعقب الحجاج واكتشاف الحرائق ، مھا بن خنين، فاطمة العمري، مريم الدجين، نورة العنقري، أنيس قوبعة. د [71]محرم , الحج والعمرةالملتقى العلمي التاسع 1بحاث خ�ل الحج والعمرة باستخدام شبكات الحّساسات ال�سلكية،

1930

research activities report - coins-lab.org fileacademic experience after phd. 2006-current assistant...

Documents