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Ad hoc & Sensor Networks-

Ad hoc & Sensor Networks-. Theory and Applications. Carlos Cordeiro Philips Research North America Briarcliff Manor, NY Dharma P. Agrawal OBR Research Center for Distributed and Mobile Computing University of Cincinnati, OH. Table of Contents. Chapters: Introduction

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Ad hoc & Sensor Networks-

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  1. Ad hoc & Sensor Networks- Theory and Applications Carlos Cordeiro Philips Research North America Briarcliff Manor, NY Dharma P. Agrawal OBR Research Center for Distributed and Mobile Computing University of Cincinnati, OH

  2. Table of Contents • Chapters: • Introduction • Routing in Ad hoc Networks • Broadcasting, Multicasting and Geocasting • Wireless LANs • Wireless PANs • Directional Antenna Systems • TCP over Ad Hoc Networks • Wireless Sensor Networks • Data Retrieval in Sensor Networks • Security • Integrating MANETs, WLANs and Cellular Networks

  3. Chapter 1: Introduction • Introduction • The Communication Puzzle • Applications of MANETs • Challenges • Scalability • Quality of Service • Client-Server Model Shift • Security • Interoperation with the Internet • Energy Conservation • Node (MH) Cooperation • Interoperation • Book Organization • Conclusions and Future Directions • Homework Questions/Simulation Projects • References

  4. MH2 MH4 Asymmetric link MH3 MH5 MH7 Symmetric link MH1 MH6 A Mobile Ad Hoc Network (MANET) MH2

  5. Characteristics of a MANET • An autonomous system of nodes (Mobile Hosts: MHs) connected by wireless links • Same channel used by all nodes • Lack of fixed infrastructure • Absence of centralized authority • Peer-to-peer connectivity • Multi-hop forwarding to ensure network connectivity • Topology may change dynamically • Random Multi-hop Graph • Energy-constrained • Bandwidth-constrained, variable capacity links

  6. Important characteristics of a MANET

  7. The envisioned communication puzzle of 4G and beyond

  8. The scope of various wireless technologies

  9. Collaborative Work Collaborative computing might be important outside office environments Crisis-management Applications Natural disasters with entire communications infrastructure in disarray Restoring communications quickly is essential Infrastructure could be set up in hours instead of days/weeks Personal Area Networking Short-range, localized network of nodes associated with a person Nodes could be attached to someone’s cell phone, pulse watch, belt, etc. Bluetooth is an example Eliminates need of wires between devices such as printers, cell phones, PDAs, laptop computers, headsets, etc. IEEE 802.15 standard working group Applications of MANETs

  10. Future Challenges in Ad hoc and Sensor Networks • Scalability • Short-range Throughput per node decreases at a rate 1/ , where N is the number of nodes • This cannot be fixed except by physical layer improvements, such as directional antennas • Quality of service • Need to provide best-effort service only for Voice, live video and file transfer • Client server model shift • There is no server, but demand for basic services still exists. • Address allocation, name resolution, authentication and service location are just examples of very basic services which are needed • Security • Lack of any centralized network management or certification authority • Networks are particularly prone to malicious behavior • Interoperation with the Internet • Networks require some Internet connection • Interface between the two are very different • Energy conservation • Lifetime of a single battery and the whole network. • Node cooperation • Why anyone should relay other people’s data • Interoperation • What happens when two autonomous ad hoc networks move into same area

  11. Chapter 2: Unicast routing over ad hoc networks Chapter 3: Multicasting, Broadcasting and geocasting in ad hoc networks Chapters 4 and 5: Most widely used MAC and physical layers for ad hoc networks Chapter 6: Use of directional antenna for increasing capacity, connectivity, and covertness of ad hoc networks Chapter 7: The issue of TCP (Transmission Control Protocol) over ad hoc networks Chapter 8: Introduction to sensor networks Chapter 9: Data retrieval in sensor networks Chapter 10: Security in ad hoc networks Chapter 11: Integration of heterogeneous wireless technologies in the context of ad hoc and sensor networks Book outline

  12. Book Organization All chapters Application Chapters 7, 9 and 11 Transport Chapters 2, 3, 6, 8, 9, 10, and 11 Network LLC Chapters 4, 5, 6, 8, 9, and 11 Data MAC Link Chapters 4, 5, 6, and 11 Physical

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