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Wireless Networks of Devices (WIND)

Wireless Networks of Devices (WIND). Hari Balakrishnan and John Guttag MIT Lab for Computer Science http://wind.lcs.mit.edu/ NTT-MIT Meeting, January 2000. Future networks. Audio. Video. Sensors. Wireless. Devices. Mobile users. Motivation. Networks today. Clients. Routers.

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Wireless Networks of Devices (WIND)

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  1. Wireless Networks of Devices (WIND) Hari Balakrishnan and John Guttag MIT Lab for Computer Science http://wind.lcs.mit.edu/ NTT-MIT Meeting, January 2000

  2. Future networks Audio Video Sensors Wireless Devices Mobile users Motivation Networks today Clients Routers Web servers

  3. Automatically obtain active map of region Location-based wireless services • Spontaneous networking • Communication & control • Mobility & group communication

  4. WIND project • Configuration • Topology formation in mobile networks • Routing • Protocols for mobile device networks • Resource discovery • New naming system for device networks • Adaptation • Congestion Manager for multimedia • Security & privacy • Private location support system

  5. Resource discovery • Problem: advertise and locate networked services • Heterogeneous environment • Wide variety of devices, services, and information • Dynamic environment • Mobile nodes and services • Variable, unpredictable performance • Device failures • Services composed of groups of nodes

  6. Solution: Intentional Naming System (INS) Names are intentional; apps know what, not where Expressiveness Integrate name resolution and message routing to handle mobility Responsiveness Decentralized, cooperating resolvers Robustness Name resolvers self-configure into overlay network Easy configuration

  7. Naming and service discovery • Wide-area naming (DNS) • Attribute-based systems (X.500) • Brokers (CORBA, ANSA) • Service location protocol (IETF) • Device discovery • Jini, Universal plug-and-play • Intentional Naming System (INS) • Mobility & dynamism via late binding • Decentralized, serverless operation • Easy configuration

  8. [vspace = mit.edu/thermometer] [building = ne43 [floor = 5 [room = *]] [temperature < 600F] data Intentional names • Expressive name language (like XML) • Providers announce descriptive names • Clients make queries • Attribute-value matches • Wildcard matches • Ranges • [vspace = lcs.mit.edu/camera] • [building = ne43 • [room = 510]] • [resolution=800x600] • [access = public] • [status = ready]

  9. Query • [building = ne-43 • [room = 510]] • [entity = camera] INS architecture Name Name resolver Client Periodic advertisement Overlay network of resolvers Service

  10. Name resolver functions • Name lookup • Routing protocol • Handling service mobility • Message forwarding • Self-configuration algorithm

  11. [building = ne-43 • [room = 510]] • [entity = camera] • [building = ne-43 • [room = 510]] • [entity = camera] Routing protocol tracks changes Service Name Name resolver Triggered update Client Overlay network of resolvers Service mobility

  12. Late binding handles mobility Name resolver • [building = ne-43 • [room = 504]] • [entity = camera] Forward to best location • [building = ne-43 • [room = *]] • [entity = camera] • flag = ANY • [building = ne-43 • [room = 510]] • [entity = camera] data Intentional anycast

  13. Intentional multicast for group communication Name resolver • [building = ne-43 • [room = 504]] • [entity = camera] Forward along spanning tree • [building = ne-43 • [room = *]] • [entity = camera] • flag = ALL • [building = ne-43 • [room = 510]] • [entity = camera] data

  14. Two notable properties • Robustness • Distributed cooperation without centralized servers • Routing information about names • Multicast forwarding • Self-configuration • Resolver network topology based on network performance • Decentralized spanning tree algorithm

  15. Status • Java implementation of INS & applications • Active map, video delivery, audio jukebox, camera network (demo) • Alpha code release for NTT • Scalability & deployment • Wide-area architecture being designed • Standardization: MIME for devices/services (XML-based)

  16. Summary • Future networks will include heterogeneous devices & services • Configuration, routing, discovery, adaptation, security • INS handles resource discovery in dynamic, mobile networks • Expressiveness: intentional names • Responsiveness: late binding • Robustness: decentralized resolvers • Configuration: self-configuration protocol http://wind.lcs.mit.edu/

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