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Contextaware service framework for future internet

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Overview Context Aware Services. Context awareness. Linking changes in the environment with computer systems, which are otherwise static ... Haggle ... – PowerPoint PPT presentation

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Title: Contextaware service framework for future internet


1
Context-aware service framework for future
internet
  • Nov. 2007
  • Dongman Lee / ICU

2
Table of contents
  • Overview
  • Context aware service in other future internet
    initiatives
  • Research topics
  • Location context
  • Service interaction
  • Service discovery
  • Conclusion
  • Future directions

3
Overview Context Aware Services
  • Context awareness
  • Linking changes in the environment with computer
    systems, which are otherwise static
  • Considerations
  • Capture and exploit context information
  • Spontaneous and ad hoc service interaction
  • Service centric networking

4
Overview Research topics
Application
Service
support
match
Service discovery
Context awareness
Location context
Support (as enabler as well as context)
Support (as context)
Service interaction
Network
5
Context aware service in other future internet
initiatives
  • Projects in NSF NeTS FIND
  • A Geometric Stack for Location-Aware Networking
  • New geometric stack for enabling general purpose
    spatial communications
  • Service-Centric End-to-End Abstractions for
    Network Architecture
  • Services can be specified by end-systems, mapped
    to resources inside the network, and controlled
    during their operation.
  • An Internet Architecture for User-Controlled
    Routes
  • An Internet architecture that enables users or
    their end-systems to select the paths their
    packets take through the network.
  • CABO Concurrent Architectures are Better Than
    One
  • Allows a service provider to operate multiple
    virtual networks, each of which is tailored to a
    specific application

6
Context aware service in other future internet
initiatives (cont.)
  • EC FP7 Work Programme 2007-08
  • Target outcome of Objective ICT-2007.1.1 The
    Network of the Future
  • a) Ubiquitous network infrastructures and
    architectures supporting iv) context
    awareness
  • Target outcome of Objective ICT-2007.1.2
    Service and Software Architectures,
    Infrastructures and Engineering
  • a) Service architectures, platforms,
    technologies, methods and tools that enable
    context awareness and discovery, advertising,
    personalisation and dynamic composition of
    services.

7
Location context
  • Motivation
  • The Internet will not be successfully translated
    to the mobile world without location awareness
    which is a significant enabler in order to
    translate the Internet into a viable mobile
    economy -- Bob Egan, Vice President / Mobile
    Wireless, Gartner Group
  • Positioning technologies
  • GPS / Cellular networks / WLANs
  • Other location contexts
  • Direction / Mobility / Space / Co-location

8
Location context (cont.)
  • Recent trends
  • IETF
  • ECRIT (Emergency Context Resolution with Internet
    Technologies)
  • Open mobile alliance (OMA)
  • Mobile location protocol (MLP)
  • An application-level protocol for getting the
    position of mobile stations independent of
    underlying network technology
  • WLANs
  • IEEE 802.11u, 802.11v, 802.11k want to augment
    functions for location service
  • E.g. in 802.11v, each AP can have its geographic
    or civic location

9
Location context (cont.)
  • Summary
  • Accurate positions play vital roles
  • No single winner
  • Convergence of various (especially wireless)
    communication technologies will help to enhance
    the precision of positioning technologies
  • Eventually, wired world as well as wireless world
    will benefit from location context

10
Service interaction
  • Motivation
  • Human factor
  • Human resource is the most precious factor.
  • Recognition is easier than recall.
  • ? Communication should be designed to require
    less human intellectual power.
  • Internet today
  • Data transfer ltlt Request Reply
  • 80 of traffic is HTTP.
  • Yahoo ltlt Google
  • Contents rather than sites
  • UCC, Blog, Cyworld,
  • Publish or perish

11
Service interaction (cont.)
  • Recent trends
  • TRIAD
  • Defines content layer that provides content
    routing, caching and transformation
  • End points are designated by names (or URLs)
    while IP addresses are used as transient routing
    tags.
  • DONA
  • A data item is identified by a self-certifying
    flat label, which is used to fetch and route the
    item.
  • Content centric networking in Xerox PARC
  • Shifts focus from transmitting data by geographic
    location (or address) to disseminating it via
    named content.
  • Haggle
  • Asynchronous and data-centric network
    architecture designed for local connectivity
    resources

12
Service interaction (cont.)
  • Summary
  • Putting more intelligence in the network
  • Application layer information as routing target
  • From implicit data with explicit addressing to
    explicit data with implicit addressing
  • (Explicitly) utilizes intermediate nodes
  • E.g. Store-and-forward in delay tolerant network
  • E.g. Video transformation in the network
  • Added primitives
  • Network should support ADVERTISE / REQUEST /
    REPLY of services as well as routing of packets.
  • These primitives are NOT new since they have been
    used in routing protocols (esp. in MANETs).

13
Service discovery
  • Service-centric networking
  • Current Internet Finding paths to network nodes
  • Applications run on top of routing.
  • Future Internet Finding paths to services
  • Applications run on top of Service Discovery
  • Requirements
  • Semantic Matching
  • Similarity-based service matching and ranking
  • Personalization
  • Scalability

14
Service discovery (cont.)
  • Recent trends
  • Service discovery in MANETs
  • Flooding based
  • Tight coupling between SD and routing
  • DHT based
  • Data items are distributed randomly in the
    network
  • Nodes whose are logical neighbors of each other
    store unrelated data items
  • Efficient in data lookup but support only
    syntactic matching
  • Semantic encoding/indexing
  • Target the problem of distributed
    similarity-based searching
  • Key idea encode data items (service instance) to
    keys
  • Semantic-preservation

15
Service discovery (cont.)
  • Summary
  • DHT-based architecture seems to be a better
    choice for design
  • Separate complex function into layers
  • Designing a shared infrastructure is still
    challenging
  • Service/data representations are
    application-specific.
  • Personalized service discovery and ranking is the
    key for a shared infrastructure

16
Conclusion
Scalability
Location context
Security
Scalable directory management and message
forwarding
Ubiquity
? ? ? ? ?
? ? ? ? ?
Dynamic peer binding
Service interaction
Reconfigurability

?
Mobility
Adapt to networks
Heterogeneity
Service discovery
Semantics based matching
Manageability
Network as context
Context awareness
Context awareness
Context-based ranking
17
Future directions
  • Context awareness
  • Distributed context management
  • Group context management
  • Location context
  • Non anchored ad hoc localization
  • Inter-space location management
  • Naming
  • Non anchored unified naming
  • Service/Contents Creation/Dissemination Network
  • Content based networking
  • Trust based Security
  • Self certifying system
  • Trust based service discovery, dissemination,
    composition
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