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Self-Organized Networks an Introduction

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Self-Organized Networks an Introduction

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    1. 1 Self-Organized Networks an Introduction

    2. 2 The classical solution for wireless networks

    3. 3 New paradigm: ad-hoc networks Initial applications: communication in the battlefield (Packet Radio Networks, in the 70s) Ad-hoc networks are not permanent. They evolve dynamically over time as users initiate a communication with each other, join an existing network or stop communicating altogether. Examples: Content sharing peer-to-peer applications (Kazaa, gnutella), 802.11: has both infrastructure-based and ad-hoc mode Bluetooth piconets Initial applications: communication in the battlefield (Packet Radio Networks, in the 70s) Ad-hoc networks are not permanent. They evolve dynamically over time as users initiate a communication with each other, join an existing network or stop communicating altogether. Examples: Content sharing peer-to-peer applications (Kazaa, gnutella), 802.11: has both infrastructure-based and ad-hoc mode Bluetooth piconets

    4. 4 Hybrid networks Mix of fixed infrastructure and ad-hoc capabilities. Depending on its position, a node can either: Communicate with one of the base stations if it is within reach Communicate with one or several intermediate nodes in order to reach the closest base-stationMix of fixed infrastructure and ad-hoc capabilities. Depending on its position, a node can either: Communicate with one of the base stations if it is within reach Communicate with one or several intermediate nodes in order to reach the closest base-station

    5. 5 Interconnectivity

    6. 6 Self-organized networks Particular case of ad-hoc networks The network is self-organized when it is run by the users themselves Similar trend at the application layer: peer-to-peer(e.g., Napster -> Gnutella)

    7. 7 Examples of ad hoc networks Sensor networks Hybrid cellular / ad hoc networks (multi-hop cellular networks) Cars Assisted driving (adaptive cruise control,) Collision avoidance Optimization of traffic flows Crisis networks (e.g., rescue operations after major disaster) Military networks

    8. 8 Ad-hoc network advantages No need of infrastructure Ease of deployment Topology flexibility Bottom-up approach to creating networks Absence of authority (civil rights advocates)

    9. 9 Self-Organized networks drawbacks Limited scalability [Gupta and Kumar 1999] Billing Cooperation between nodes Absence of authority (the authority)

    10. 10 EPFL and MICS Mobile Information and Communication Systems (alias terminode) One of the 14 NCCRs MICS focuses on self-organized, ad hoc, infrastructure-less networks

    11. 11 MICS Facts and Figures Started November 2001 10 years research program Budget : 8 million Swiss Francs per year 30 faculty members and 80 PhD students Director: Prof. M. Vetterli (EPFL) Deputy Director: Prof. Th. Gross (EPFL)

    12. 12 References Ch. Perkins: Ad Hoc Networking, Addison Wesley, 2001 http://www.terminodes.org

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