abstract = {With the widespread availability of multiple wireless network technologies, mobile com-
puting devices can benefit from almost uninterrupted connectivity by changing network
attachments as they move. This however raises the problem of the selection method to be
used for the choice of the wireless networks to associate with, in order to provide the best
performance. Moreover, mobility events may result in poor application quality, due to
either a disruption in connectivity during the handover or the heterogeneity of the charac-
teristic of different access networks. To address these problems, this thesis introduces and
studies all three elements (observation, decision, action) of a control framework to enable
better use of available network resources.
We first show that a decision mechanism which directly considers the relevant user- and
application-centric metrics is more appropriate than using the common network metrics-
based indirect approach. This mechanism is used to control the entire network stack
of the mobile node in a coordinated way, rather than individual components, to avoid
potentially conflicting combinations. Our results indicate that, by exploiting the flexibility
of application parameters, it is possible to maintain high application quality while reducing
both the power consumption and access price.
We then introduce a mobility-aware extension to the TCP-Friendly Rate Control mechan-
ism (TFRC), as an action element, to address the disruption in connectivity resulting from
the mobility events. We propose to suspend the transmission before disconnections and to
probe the network after reconnections. Simulations demonstrate how this enables faster
recovery after disconnected periods as well as a significantly improved adaptation to the
newly available network conditions. When used with the Datagram Congestion Control
Protocol (DCCP), experiments show that it provides better support for real-time applica-
tions for which the user-perceived quality is very dependent on the immediate transmission
Finally, we present an experimental process to evaluate the OMF Measurement Library
(OML), a lightweight instrumentation and reporting tool which we propose to use as the
observation element of our framework. We show that this library does not significantly
impact the performance of the instrumented applications, while accurately reporting the
observed metrics.},
    address = {Paris, France / Sydney, Australia},
    author = {Mehani, Olivier},
    day = {14},
    howpublished = {French title ``Contributions aux m\'{e}canismes de r\'{e}seau pour un usage adaptatif des ressources mobiles''},
    keywords = {analysis, cross-layer, dccp, evaluation, flowdistribution, imara, inria, ipv6, lara, mcoa, minesparistech, minizinc, mipv6, mobility, network, networkresearchgroup, nicta, ns-2, oliviermehani, oml, phd, qoe, simulation, stack, tfrc, transport, unsw},
    month = dec,
    school = {Mines ParisTech / University of New South Wales},
    title = {Contributions to Mechanisms for Adaptive Use of Mobile Network Resources},
    url = {http://olivier.mehani.name/publications/2011mehani_adaptive_use_mobile_networks_phd.pdf},
    year = {2011}
    abstract = {We consider the problem of network selection and flow distribution for a multihomed mobile device. We argue the benefits of a holistic approach which considers user- and application-centric metrics such as quality, energy consumption and monetary cost, rather than the commonly used network-centric metrics. We thus introduce the multihomed flow management problem which combines network selection, flow distribution and application flow awareness. We formulate it as a constrained optimisation problem and compare it to commonly used techniques: single network selection and load balancing. For selected interactive applications, we use empirical network measurements to evaluate the optimal solutions obtained by the three approaches. We show that, by exploiting the flexibility of application parameters, it is possible to achieve the potentially conflicting goals of maintaining high application quality while reducing both the power consumption and cost of network use.},
    address = {Los Alamitos, CA, USA},
    author = {Mehani, Olivier and Boreli, Roksana and Maher, Michael and Ernst, Thierry},
    booktitle = {LCN 2011, 36th IEEE Conference on Local Computer Networks},
    day = 4,
    editor = {Tom Pfeifer and Anura Jayasumana},
    publisher = {IEEE Computer Society},
    keywords = {3g, 80211, 80216, caor, constraintprogramming, flowdistribution, imara, inria, minesparistech, minizinc, mobile, network, networkedsystems, networkselection, nicta, oliviermehani, wifi, wimax},
    isbn = {978-1-61284-928-7},
    location = {Bonn, Germany},
    month = oct,
    page = {26--34},
    title = {User- and Application-Centric Multihomed Flow Management},
    year = {2011},
    url = {http://www.nicta.com.au/pub?id=4578},
    pdf-url = {http://www.nicta.com.au/pub?doc=4578},
    conference-url = {http://www.ieeelcn.org/},
  abstract        = "Mobile Ad hoc Network (MANET) routing protocols and
	  Network Mobility (NEMO) Basic Support are considered
	  keytechnologies for vehicular networks. MANEMO, that is, the
	  combination of MANET (for infrastructureless communications)
	  andNEMO (for infrastructure-based communications) offers a
	  number of benefits, such as route optimization or multihoming.
	  Withthe aim of assessing the benefits of this synergy, this
	  paper presents a policy-based solution to distribute traffic
	  among multiplepaths to improve the overall performance of a
	  vehicular network.  An integral vehicular communication testbed
	  has been developedto carry out field trials. First, the
	  performance of the Optimized Link State Routing protocol (OLSR)
	  is evaluated in a vehicularnetwork with up to four vehicles. To
	  analyze the impact of the vehicles' position and movement on
	  network performances, anintegrated evaluation environment called
	  AnaVANET has been developed. Performance results have been
	  geolocated using GPSinformation. Second, by switching from NEMO
	  to MANET, routes between vehicles are optimized, and the final
	  performance isimproved in terms of latency and bandwidth. Our
	  experimental results show that the network operation is further
	  improved withsimultaneous usage of NEMO and MANET.",
  address = "New York, NY, USA",
  author  = "Tsukada, Manabu and Santa, Jos\'{e} and Mehani, Olivier and
	  Khaled, Yacine and Ernst, Thierry",
        day     = 30,
  doi     = "10.1155/2010/656407",
  editor  = "Pishro-Nik, Hossein and Valaee, Shahrokh and Nekovee,
  journal = "EURASIP Journal on Advances in Signal Processing",
        month   = September,
  note    = "Article ID 656407, Special Issue on Vehicular Networks",
  publisher       = "Hindawi",
  title   = "Design and Experimental Evaluation of a Vehicular Network
	  Based on NEMO and MANET",
  volume  = "2010",
  url     = "http://www.hindawi.com/journals/asp/2010/656407.html",
  pdf-url = "http://downloads.hindawi.com/journals/asp/2010/656407.pdf",
        year    = 2010,
        abstract= "We propose to demonstrate a cross-layer enhancement of
                DCCP/TFRC which allows the transport to better handle network
                mobility handovers and adapt faster to the capacity available in
                the new network. We argue Freeze-DCCP is well suited for
                real-time traffic such as multimedia streaming. The mechanism
                has been implemented in the Linux kernel and the demonstration
                is run in a mobility testbed.",
        address = "New York, NY, USA",
        author  = "Mehani, Olivier and Boreli, Roksana and Jourjon, Guillaume
                and Ernst, Thierry",
        booktitle       = "MobiCom 2010, 16th Annual International Conference on
                Mobile Computing and Networking, Demonstration Session",
        day     = "21",
        editor  = "Banerjee, Suman and Katabi, Dina and Choudhury, Romit R. and Lundgren, Henrik",
        location        = "Chicago, IL, USA",
        month   = "September",
        publisher       = "ACM",
        title   = "Mobile Multimedia Streaming Improvements with Freeze-DCCP",
        url     = "http://www.nicta.com.au/research/research_publications/show?id=4097",
        pdf-url = "http://olivier.mehani.name/publications/2010mehani_freezedccp_demo.pdf",
        conference-url  = "http://www.sigmobile.org/mobicom/2010/demos.html",
        year    = "2010",
  abstract = "Experimental evaluation of Vehicular Ad-hoc Networks (VANETs) is still a remaining issue for most researchers. Some works carry out performance tests to evaluate the communication channel according to physical and MAC conditions. Only a few works deal with multi-hop experimentation, but practically none use routing protocols. In this paper an integral VANET testbed is evaluated, using 802.11b and a multi-hop network managed by the Optimised Link State Routing (OLSR) protocol. Up to four vehicles are used to study the VANET performance over different traffic environments and different metrics are considered to analyse the results, including a deeper analysis to track the routes followed by packets end to end. Results differ from traditional one-hop and static-route tests, presenting a more realistic study.",
  address = "Geneva, Switzerland",
  author = "Santa, Jos\'e and Tsukada, Manabu and Ernst, Thierry and Mehani, Olivier and G\'omez-Skarmeta, Antonio F.",
  doi = "10.1504/IJIPT.2009.028655",
  issn = "1743-8209",
  journal = "International Journal of Internet Protocol Technology",
  keywords = "80211, experiment, imara, lara, multihop, oliviermehani, vanet",
  month = "September",
  number = "3",
  pages = "158--172",
  publisher = "Inderscience Publishers",
  title = "Assessment of VANET Multi-hop Routing over an Experimental Platform",
  url = "http://dx.doi.org/10.1504/IJIPT.2009.028655",
  volume = "4",
  year = "2009"
    abstract = {Trust establishment in VANET is a particularly challenging task due to the lack of infrastructure, openness of wireless links and the usually highly dynamic network topology. To overcome these difficulties, we propose a trusted routing framework that provides message authentication, node-to-node trust and routability verification, without online assistance of Certificate Authorities (CA). Our approach prevents identity impersonation, false link availability indication by compromised nodes as well as some of routing protocol specific misbehaviours. By applying this framework to the Optimised Link State Routing Protocol (OLSR), we demonstrate how this mechanism can be used to establish trusted routes.},
    address = {Piscataway, NJ, USA},
    author = {Chen, Terence and Mehani, Olivier and Boreli, Roksana},
    booktitle = {ITST 2009, 9th International Conference on Intelligent Transport Systems Telecommunications},
    day = {20},
    editor = {Berbineau, Marion and Itami, Makoto and Wen, GuangJun},
    isbn = {1-4244-1178-5},
    keywords = {2009, ad-hoc, imara, inria, lara, mesh, minesparistech, networkedsystems, nicta, oliviermehani, olsr, phd, pki, protocol, routing, trust, wireless},
    location = {Lille, France},
    month = {October},
    pages = {647--652},
    publisher = {IEEE Computer Society},
    title = {Trusted Routing for VANET},
    url = { http://www.nicta.com.au/research/_research_publications/show?id=2152},
    year = {2009}
    abstract = {We propose a framework to optimize the communication performance and mobility management in vehicular networks. By having a single unified decision algorithm taking into account both stack-related and external contextual information such as GPS localization or signaling from other nodes, advice can be provided to every layer in the network stack to allow for globally optimized, faster and more accurate adaptation to the current conditions. We present how key example scenarios would benefit from such a system. We describe an instance of this framework using a constraint satisfaction problem (CSP) approach. We also describe our prototype implementation of the network data collection system and give some timing evaluation for a given constraint solver.},
    address = {Piscataway, NJ, USA},
    author = {Mehani, Olivier and Boreli, Roksana and Ernst, Thierry},
    booktitle = {ITST 2009, 9th International Conference on Intelligent Transport Systems Telecommunications},
    day = {20},
    editor = {Berbineau, Marion and Itami, Makoto and Wen, GuangJun},
    isbn = {1-4244-1178-5},
    keywords = {2009, adaptive, context, imara, inria, ipv6, itst2009, lara, minesparistech, nemo, network, networkedsystems, nicta, oliviermehani, optimization, phd, vehicle},
    location = {Lille, France},
    month = {October},
    pages = {186--191},
    publisher = {IEEE Computer Society},
    title = {Context-Adaptive Vehicular Network Optimization},
    url = {http://hal.inria.fr/inria-00426451/},
    year = {2009}
    abstract = {We present enhancements to the TCP-Friendly Rate Control mechanism (TFRC) which are designed to better cope with the intermittent connectivity available to mobile devices or in Delay Tolerant Networks. Our aim is to prevent losses during disconnected periods and quickly adapt to new network conditions. We propose to suspend the transmission before disconnections occur in a way inspired by Freeze-TCP, then probe, in a new way, the network after reconnecting to enable full use of the newly available bandwidth. We first evaluate the potential performance gains for realistic network parameters. We then describe the proposed additions to TFRC and their implementation within the Datagram Congestion Control Protocol (DCCP) in ns-2. Comparisons of simulation results for example mobility scenarios show that the proposed enhancements enable faster recovery upon reconnection as well as significantly improved adjustment to the newly available network conditions.},
    address = {New York, NY, USA},
    author = {Mehani, Olivier and Boreli, Roksana and Ernst, Thierry},
    booktitle = {MobiArch 2009, 4th international workshop on Mobility in the evolving internet architecture},
    day = {22},
    editor = {Ott, Jörg and Tan, Kun},
    isbn = {978-1-60558-688-5/09/06},
    keywords = {2009, 3g, 80211, 80216, analysis, caor, dccp, fast, handoff, minesparistech, mipv6, mobility, oliviermehani, phd, simulation, tfrc, transport, unsw},
    location = {Kraków, Poland},
    month = {June},
    organization = {ACM SIGMOBILE},
    publisher = {ACM},
    title = {Analysis of TFRC in Disconnected Scenarios and Performance Improvements with Freeze-DCCP},
    url = {http://olivier.mehani.name/publications/2009mehani_freezedccp.pdf},
    year = {2009}
    abstract = {Mobile Ad-hoc Network (MANET) routing protocols and NEMO Basic Support are considered key technologies for vehicle networks. Cooperation between MANET and NEMO (MANEMO) brings several benefits especially for route optimization and multihoming. We made a real field vehicle communication environment with NEMO and MANET. By switching from NEMO to MANET, routes between vehicles are optimized and network performances improved in terms of latency and bandwidth. Experiment results show that network performances are further improved with simultaneous usage of NEMO and MANET. Network performances were shown on a web site in real time and mapped at locations using GPS information.},
    address = {Brussels, Belgium},
    author = {Tsukada, Manabu and Mehani, Olivier and Ernst, Thierry},
    booktitle = {TridentCom 2008, 4th International Conference on Testbeds and Research Infrastructures for the Development of Networks & Communities},
    comment = {WEEDEV 2008, 1st Workshop on Experimental Evaluation and Deployment Experiences on Vehicular Networks},
    day = {17},
    editor = {de Leon, Miguel P.},
    keywords = {2008, imara, inria, lara, manemo, manet, multihoming, nemo, oliviermehani, phd, tridentcom2008, vanet, weedev2008},
    location = {Innsbruck, Austria},
    month = {March},
    publisher = {ICST (Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering)},
    title = {Simultaneous Usage of NEMO and MANET for Vehicular Communication},
    url = {http://portal.acm.org/citation.cfm?doid=1390576.1390592},
    year = {2008}
    abstract = {In the context of mobile and pervasive networking, it is not uncommon to experience frequent loss of connectivity. Congestion control algorithms usually mistake resulting packets losses for congestion events and unnecessarily reduce their network usage. We propose an enhancement to the TCP-Friendly Rate Control protocol to overcome this issue. Our contribution proposes to suspend the data transfer, in a way similar to Freeze-TCP, when an upcoming disconnection is predicted. Furthermore, a probing mechanism is introduced to enable fast adaptation to new network conditions. We present a description of the additional freezing and resuming mechanisms. This proposal has been implemented in ns-2. Simulation results are thus compared to the regular behavior.},
    address = {New York, NY, USA},
    author = {Mehani, Olivier and Boreli, Roksana},
    booktitle = {CoNEXT 2008, 4th ACM International Conference on emerging Networking EXperiments and Technologies},
    comment = {Student Workshop},
    doi = {10.1145/1544012.1544049},
    editor = {Ross, Keith W. and Tassiulas, Leandros},
    isbn = {978-1-60558-210-8},
    keywords = {2008, caor, conext2008, congestioncontrol, dccp, manet, minesparistech, mobility, networkedsystems, nicta, oliviermehani, phd, tfrc, unsw},
    location = {Madrid, Spain},
    month = {December},
    organization = {ACM SIGCOMM},
    publisher = {ACM},
    title = {Adapting TFRC to Mobile Networks with Frequent Disconnections},
    url = {http://dx.doi.org/10.1145/1544012.1544049},
    year = {2008}
    abstract = {Trying to provide safer and more efficient transportation solutions, the need for reliable and efficient communications is increasing in ITS (Intelligent Transportation Systems) use cases such as collaborative road data collection, driver information systems, infotainment or fully driverless vehicles. Applications that rely on vehicle-infrastructure (V2I) and vehicle-vehicle (V2V) communications have different requirements and would benefit from a widely deployed common standard for the exchange of data. IP (Internet Protocol) is thus advocated as the convergence layer between the various available wireless technologies available on the market. This paper surveys the methods employed in the Imara team to provide a stable communication environment allowing driverless vehicles to interact with each other in several scenarios where information sharing is required. An account of how the solutions are integrated and how well they behave together in live experiments is given.},
    address = {Los Alamitos, CA, USA},
    author = {Mehani, Olivier and Benenson, Rodrigo and Lemaignan, Séverin and Ernst, Thierry},
    booktitle = {ITST 2007, 7th International Conference on Intelligent Transport Systems Telecommunications},
    doi = {10.1109/ITST.2007.4295894},
    editor = {Finger, Ulrich and Fujise, Masayuki and Bonnet, Christian and Lenardi, Massimiliano and Komaki, Shozo and Wen, Guangjun},
    keywords = {2007, imara, inria, ipv6, itst2007, lara, manet, multicast, oliviermehani, olsr, ontology, servicediscovery, v2i, v2v, vanet, vehicle},
    location = {Sophia Antipolis, France},
    pages = {362--367},
    publisher = {IEEE Computer Society},
    title = {Networking Needs and Solutions at Imara},
    url = {http://dx.doi.org/10.1109/ITST.2007.4295894},
    year = {2007}
    abstract = {In the context of Intelligent Transportation Systems based on driverless vehicles, one important issue is the passing of a crossroads. This paper presents a supervised reservation system. Extending previous works in this direction, the proposed algorithm determines trajectories and speeds for all the vehicles willing to pass the intersection. The work is separated into tasks shared between the vehicles and an infrastructure in charge of the crossroads. This paper describes the characteristics of the algorithm, as well as considerations which led to it. Simulation results are given and support the argument that this algorithm is probably suboptimal but still performs well. Finally, this work shows there is place for ameliorations and hints to further improve the algorithm are given.},
    address = {Heidelberg, Germany},
    author = {Mehani, Olivier and de La Fortelle, Arnaud},
    booktitle = {EUROCAST 2007, 11th International Conference on Computer Aided Systems Theory},
    doi = {10.1007/978-3-540-75867-9},
    editor = {Díaz, Roberto M. and Pichler, Franz and Arencibia, Alexis Q.},
    keywords = {2007, crossroads, cycab, driverless, eurocast2007, imara, inria, lara, msc, oliviermehani, simulation},
    location = {Las Palmas de Gran Canaria, Spain},
    month = {February},
    pages = {1159--1166},
    publisher = {Springer-Verlag Berlin},
    series = {Lecture Notes in Computer Science},
    title = {Trajectory Planning in a Crossroads for a Fleet of Driverless Vehicles},
    url = {http://dx.doi.org/10.1007/978-3-540-75867-9},
    volume = {4739},
    year = {2007}
    abstract = {In the context of driverless automatic road vehicles, one interesting and non-trivial problem is that of the passing of a crossroads. At an intersection between two roads, the risk of collision is much higher due to the presence of other vehicles not going in the same direction, and potentially crossing each other's path. It is necessary to find safe algorithms allowing every vehicle to pass this sensitive point without colliding. Moreover, it is important, while doing so, to keep efficiency in mind, for the vehicles not to wait forever before entering and passing the intersection. Every vehicle must pass the crossroad as fast as the safe possibilities allow. This 6 months internship, done with the Imara team, tried to come up with an efficient algorithm for crossroads passing. A simulator has been written, giving the possibility to test various algorithms and efficiency comparisons have been made in order to determine which algorithm was the most promising, and where were the behaviors that could still be improved. Finally, an algorithm based on a reservation of critical points has seemed to be the most interesting. Details about its inner working and implementation are given, as well as preliminary results.},
    address = {Gothenburg, Sweden/Rocquencourt, France},
    author = {Mehani, Olivier},
    keywords = {2007, chalmers, crossroads, cycab, driverless, imara, inria, lara, msc, mscthesis, oliviermehani, simulation},
    institution = {Chalmers Tekniska Högskola/Inria},
    title = {Mesoscopic Management of a Fleet of Cybercars at a Crossroads},
    url = {http://olivier.mehani.name/publications/2007mehani_cybercars_crossroads.pdf},
    year = {2007},
    file = :users:oliviermehani:publications:mehani_olivier_cas_thesis.pdf
bib/oliviermehani.txt · Last modified: 2012/07/06 06:24 by Olivier Mehani
Recent changes · Show pagesource · Login