Wireless and Mobile networks
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Wireless and Mobile networks


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Wireless and Mobile Networks

1. QoS in mobile networks, predictive mobility

The wireless Internet will allow roaming users to access their data and keeping connections active while moving from one access point to another. Making this roaming seamlessly and efficient at high hand-over rates while conserving QoS profiles is a challenge.

To make intelligent mobile-aware applications and to achieve efficient routing management, it may be important to anticipate the change of location of users in mobile networks. Many solutions can be studied, ranging from simple statistical analysis of terminals' movements to complex automatic learning techniques.

Some references

  • Mobile IP
  • Georgios Karagiannis, et al., "A Framework for QoS & Mobility in the Internet Next Generation", Internal report, Univ. of Twente, 2000.
  • George Liu and G. Maguire, "A Predictive Mobility Management Algorithm for Wireless Mobile Computing and Communications," In Proceedings of the IEEE International Conference on Universal Personal Communications (ICUPC'95), November 6-9, 1995, Tokyo, Japan.
  • T.Liu, P.Bahl, and I.Chlamtac, "Mobility Modeling, Location Tracking, and Trajectory Prediction in Wireless ATM Networks," IEEE Journal on Selected Areas in Communications, vol. 16, Aug. 2001, pp. 922 - 936.
  • S. Hadjiefthymiades, S. Papayiannis, and L. Merakos, "Using Path Prediction to Improve TCP Performance in Wireless/Mobile Communications," IEEE Communications Magazine, August 2002.

Research performed in RUN

Predicting terminals movements in mobile networks is useful for more than one reason, in particular for routing management. A way to do such prediction is to learn the movement patterns of mobile nodes passing by an access router. In Jean Marc François's research, the information (e.g. layer 2 measurements) related to the different paths followed by mobiles are learned using a Hidden Markov Model (HMM). Simulations have been done using this method and show that it can handle different layer 2 signals and collect statistical information when no such signal is available.

2. Ad hoc networks

An ad hoc network is a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. Conferencing, home networking, emergency services, personal area network and embedded computing applications are some of the potential applications for ad hoc networking.

Some open research issues in this field are quality of service, scalability, security and power control. The combination of this technology with the active network one, because they both focus on the flexibility of the network, its decentralized start up and maintenance, seems also challenging.

Some references

  • MANET
  • "Ad hoc networking", Charles Perkins editor, Addison-Wesley, Dec. 2000.
  • C. E. Perkins, Elizabeth M. Belding-Royer, Samir R. Das : "Ad hoc On-Demand Distance Vector (AODV) Routing". Internet draft, 4 Nov. 2002.

Research performed in RUN

Sandrine Calomme has designed a generic active routing application, called "Re-Active Routing" (RAR), based on the principles of the Ad Hoc on Demand Distance Vector Protocol. RAR allows the active technology to be progressively introduced in ad hoc networks. Thanks to the active platform she has developed last year for the ns-2 network simulator, she was able to study the performance of RAR in a variety of conditions, including a range of geographical densities of the ad-hoc network and a range of percentages of active nodes. Simulations have shown that RAR performs well in a variety of conditions, even if the percentage of active nodes is no more than fifteen percent.

3. TCP over wireless networks

Research performed in RUN

Ibtissam El Khayat is working on an improvement of TCP in the case of hybrid wired and wireless environments. The solution is to discriminate the two possible causes of losses (congestion or wireless channel loss), and react accordingly, typically by reducing the rate only when the loss is due to congestion. She has proposed to use automatic learning methods to classify the causes of losses, and she already got some interesting results. A paper is in preparation.


Mobile | Update Mobile


Publications

* Energy-efficient Sensor Selection for Data Quality and Load Balancing in Wireless Sensor Networks
F.H. Bijarbooneh, W. Du, E. Ngai and X. Fu
Proc. of IEEE IWQoS 2014, 26-27 May 2014, Hong-Kong, China, pp. 338-343
* Enhancement of TCP over wired/wireless networks with packet loss classifiers inferred by supervised learning
I. El Khayat, P. Geurts and G. Leduc
Wireless Networks, vol. 16, nb. 2, Feb. 2010, pp. 273-290
(ISI IF 2008 = 1.194)
* Routing Based on Delivery Distributions in Predictable Disruption Tolerant Networks
J.-M. François and G. Leduc
Ad Hoc Networks Journal, vol. 7, nb. 1, Jan. 2009, pp. 219-229
* Topologically-aware construction of unstructured overlays over ad hoc networks
S. Calomme
Doctoral thesis, University of Liège
Collection des Publications de la Faculté des Sciences Appliquées de l'Université de Liège, nr. 276, 2009, 192 pp.
Download the PDF document
* An overlay maintenance protocol for overlay routing on top of ad hoc networks
S. Calomme and G. Leduc
Keywords : ad hoc, overlay, topology
Read the abstract
Proc. of IFIP Networking 2008, 6-8 May 2008, Singapore, LNCS, 4982, pp. 48-59, Springer
(Acceptance ratio = 82/250 = 33%)
* Efficient and Resilient Overlay Topologies over Ad Hoc Networks
S. Calomme and G. Leduc
Keywords : ad hoc, overlay, topology
Read the abstract
Proc. of International Workshop on Self-Organizing Systems (IWSOS 2007), 11-13 Sep. 2007, Lancaster, United Kingdom, D. Hutchison and R.H. Katz (ed.), Self-Organizing Systems, LNCS, 4725, pp. 44-58, Springer-Verlag
* Delivery Guarantees In Predictable Disruption Tolerant Networks
J.-M. François and G. Leduc
Keywords : Delivery Guarantees, Disrutpion Tolerant Network, Mobility Prediction, Routing
Read the abstract
Download the PDF document
Proc. of IFIP Networking 2007, 14-18 May 2007, Atlanta, Georgia, USA, I.F. Akyildiz et al. (ed.), Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet, LNCS, 4479, pp. 167-178, Springer-Verlag
* AP and MN-centric Mobility Prediction: A Comparative Study Based On Wireless Traces
J.-M. François and G. Leduc
Keywords : AP-centric, Markov chain, MN-centric, mobility prediction
Read the abstract
Download the PDF document
Proc. of IFIP Networking 2007, 14-18 May 2007, Atlanta, GA, USA, I.F. Akyildiz et al. (ed.), Ad Hoc and Sensor Networks, Wireless Networks, Next Generation Internet, LNCS, 4479, pp. 322-332, Springer-Verlag
* Performing and Making Use of Mobility Prediction
J.-M. François
Doctoral Thesis, University of Liège
Collection des Publications de la Faculté des Sciences Appliquées de l'Université de Liège, nr. 263, 2007, 154 pp.
Download the PDF document
* Predictable Disruption Tolerant Networks and Delivery Guarantees
J.-M. François and G. Leduc
Keywords : Predictable Disruption Tolerant Network
Read the abstract
Download the PDF document or the compressed PostScript (gzip) document
Technical Report, published on arXiv (cs.NI/0612034 v1)
* Prédiction de mobilité par le mobile ou par le point d'accès: comparaison sur base de traces réelles
J.-M. François and G. Leduc
Keywords : Mobile Networks, Mobility prediction, QoS
Mots-clés : Prédiction de mobilité, QoS, Réseaux mobiles
Read the abstract
Lisez le résumé
Download the PDF document, the PostScript document or the compressed PostScript (gzip) document
Actes de Colloque Francophone sur l'Ingénierie des Protocoles (CFIP 2006), 30 Oct.-3 Nov. 2006, Tozeur, Tunisie
(Acceptance ratio = 28/75 = 37%)
* Elaboration d'un protocole de contrôle de topologie pour les overlays bâtis sur des réseaux ad hoc
S. Calomme and G. Leduc
Mots-clés : ad hoc, contrôle de topologie, overlay
Lisez le résumé
Actes de Colloque Francophone sur l'Ingénierie des Protocoles (CFIP 2006), 30 Oct.-3 Nov. 2006, Tozeur, Tunisie
(Acceptance ratio = 28/75 = 37%)
* Neighbour-Based Overlay Topology Control in Ad Hoc Networks
S. Calomme and G. Leduc
ACM MobiHoc, 22-25 May 2006, Florence, Italy
Poster
* The Critical Neighbourhood Range for Asymptotic Overlay Connectivity in Ad Hoc Networks
S. Calomme and G. Leduc
Keywords : ad hoc networks, connectivity, overlay, topology control
Read the abstract
Download the PDF document
Ad Hoc & Sensor Wireless Networks, vol. 2, nb. 2, 2006, pp. 169-187
* Entropy-based knowledge spreading and application to mobility prediction
J.-M. François and G. Leduc
Keywords : Entropy, Information Theory, Mobility Prediction, QoS
Mots-clés : Entropie, prédiction de mobilité, QoS, théorie de l'Information
Read the abstract
Download the PDF document or the compressed PostScript (gzip) document
Proc. of ACM International conference on Emerging Network Experiments and Technologies (Co-Next), 24-27 Oct. 2005, Toulouse, France, pp. 10-20, ACM Press
(Acceptance ratio = 21/110 = 19%)
* The Critical Neighbourhood Range for Asymptotic Overlay Connectivity in Dense Ad Hoc Networks
S. Calomme and G. Leduc
Read the abstract
Download the PDF document
Proc. of Fourth Annual Mediterranean Ad Hoc Networking Workshop (Med-Hoc-Net), 21-24 Jun. 2005, Porquerolles, France, IFIP book series, 197/2006, pp. 179-188, Springer Boston
* Improving TCP in wireless networks with an adaptive machine-learnt classifier of packet loss causes
I. El Khayat, P. Geurts and G. Leduc
Keywords : Machine Learning, TCP, Wireless
Mots-clés : Apprentissage automatique, Réseaux sans fil, TCP
Read the abstract
Download the PDF document
Proc. of IFIP International Networking Conference, 2-6 May 2005, Waterloo, Ontario, Canada, R. Boutaba, K. Almeroth, R. Puigjaner, S. Shen, J. Black (eds.), Networking 2005, LNCS, 3462, pp. 549-560, Springer-Verlag
(Acceptance ratio = 24%, ISI IF 2005 LNCS = 0.402)
* Mobility prediction's influence on QoS in wireless networks: a study on a call admission algorithm
J.-M. François and G. Leduc
Keywords : admission control, call blocking, mobility prediction
Read the abstract
Download the PDF document or the compressed PostScript (gzip) document
Proc. of 3rd International Symposium on Modeling and Optimization in Mobile, Ad-hoc and Wireless Networks (WiOpt), 3-7 Apr. 2005, Trentino, Italy, Ravi R. Mazumdar, Ioannis Stavrakakis (eds.), pp. 238-247, IEEE press
(Acceptance ratio = 31 %)
* Techniques d'apprentissage dans le contrôle de congestion : Amélioration de TCP et conception de protocoles multipoints, dans les réseaux filaires et hybrides
I. El Khayat
Doctoral Thesis, University of Liège
Collection des Publications de la Faculté des Sciences Appliquées de l'Université de Liège, nr. 257, 2005, 207 pp.
Download the PDF document
* Enhancement of TCP over wired/wireless networks with packet loss classifiers inferred by supervised learning
I. El Khayat, P. Geurts and G. Leduc
Keywords : loss cause classification, machine learning, TCP, wireless links
Read the abstract
Download the PDF document
Technical Report, March 2004
* Performance Study of an Overlay Approach to Active Routing in Ad Hoc Networks
S. Calomme and G. Leduc
Keywords : active, ad hoc, overlay
Read the abstract
Download the PDF document
Proc. of The Third Annual Mediterranean Ad Hoc Networking Workshop (Med-Hoc-Net 2004), 28-30 Jun. 2004, Bodrum, Turkey, I.F. Akyildiz, E. Cayirci, E. Ekici and G. Morabito (eds.), pp. 24-35
* Learning movement patterns in mobile networks: a generic approach
J.-M. François, G. Leduc and S. Martin
Keywords : Hidden Markov Model, Mobility prediction
Read the abstract
Download the PDF document or the compressed PostScript (gzip) document
Proc. of European Wireless 2004, 24-27 Feb. 2004, Barcelona, Spain, pp. 128-134
* Module de garantie de transmission
P. Reinbold, S. Martin, O. Bonaventure and G. Leduc
Download the PDF document
Chapitre 6 de "ARTHUR - Manuel d'informatisation des urgences hospitalières", Presses universitaires de Louvain, 2003, pp. 128-147
* Evaluation d'une méthode de prédiction des déplacements de terminaux dans les réseaux mobiles
J.-M. François, G. Leduc and S. Martin
Keywords : Hidden Markov Model, Mobility prediction
Mots-clés : Modèle de Markov caché, Prédiction de mobilité
Lisez le résumé
Download the PDF document or the compressed PostScript (gzip) document
Actes de Colloque Francophone sur l'Ingénierie des protocoles (CFIP'2003), 7-10 Oct. 2003, Paris, France, A. Cavalli, M. Riguidel, A. Serhrouchni (eds.), Ingénierie des protocoles - Réseaux mobiles et ad hoc, qualité de service, test et validation, ingénierie du trafic, pp. 189-202, Hermès Lavoisier

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