Multimedia services over networks

1
Multimedia services over networks
Framework/ Architecture
Review/background
Service provider
Multimedia Services Delivery
Bind
Publish
Multimedia system
Deployment/ Management
Service client
Service registry
Discovery
Transactions/mobility/locations
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Multimedia services delivery

• Zhiwen Yu and Daqing Zhang Middleware Support
  for Context-Aware Ubiquitous Multimedia Services.
  Handbook of Research on Mobile Multimedia. (pdf
  ).
• Conor Muldoon, Gregory M. P. O'Hare, Rem W.
  Collier, Donnacha Phelan, Robin Strahan
  Intelligent Delivery of Multimedia Content in a
  Device Aware Ubiquitous Environment. Multimedia
  Information Systems 2005 131-145, (pdf)
• Zhou Wang and Hend Koubaa Discovering Multimedia
  Services and Contents in Mobile Environments.
  Handbook of Research on Mobile Multimedia (pdf)
• Ricky Robinson, Jadwiga Indulska A
  Context-Sensitive Service Discovery Protocol for
  Mobile Computing Environments. ICMB 2005
  565-572, (pdf)

3
Context-aware multimedia service

• Context information
• Time
• Location
• Device capability
• User preferences

4
Example

• Stopping vs. moving

A
B
NTNU, Trondheim
D Distance of movement S Speed of mobile
host Nb Wireless bandwidth M Amount of data
transfered Tb Battery life-time
Ts lt Tm lt Tb
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Context Management
Situation
Context Aggregation
Context Reasoning
Query
Context Learning
Context Query
Service Clients
User profiles
Context Service
6
Context representation model
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Context ontology
Capability of media terminal
User Preference on Media
User situation
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Context-aware multimedia architecture
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Intelligent Delivery of Multimedia Content in a
Device Aware Ubiquitous Environment

• GLIDE
• Generic Language of Interface DEvelopment
• Context-aware ubiquitous environments
• Enforce a coding structure on the implementation
  of interface components
• Re-use and Extensibility
• Enable GUI independence
• Among interface components
• Between interface components and agents
• How?
• Avoid object references
• Use of agents

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Agents
Client agents
Server agents
Server
Clients
Specifying the type of device
Adaptive GUI components

• Prevent inter-component dependencies
• Decoupling
• Reuse of interface components
• Dynamic restructured GUI

Pros and Cons
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GLIDE

• Hardware
• PDAs
• Cellphones
• Software
• J2ME-CDC
• CLDC

13
GLIDE framework

• Factories
• A class that returns an instance of a particular
  interface component
• Interactions
• Defines a dependency that a component has on
  another component or agent

Composite object
GLIDE
Instance GUIcreated

• Handling
• Interactions

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GLIDE development process
PDAs
Cellphones
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GLIDE grammar

• Factory
• Which Java class whild be loaded to create
  service specific GUI components
• Interacts
• Define how the composite objects map interactions
  to entities
• Entities can be components or agents

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Dynamic restructuring GUI

• Resources
• Users behaviors

From Interface
To delivery content
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Discovering multimedia services and contents

• Context awareness
• When
• Where
• Service discovery model
• Broadcast
• Centralized service directory
• Distributed service directories

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Broadcast model
Pull vs Push
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Centralized directory model
Examples JINI, INS

1. Locating directory
2. Service registration
3. Service lookup
4. Searching

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Distributed service directories

• Service discovery is a service
• Interoperability
• Asynchronous service discovery
• Semantic service discovery

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A Context-Sensitive Service Discovery Protocol
for Mobile Computing Environments

• Discovery service
• Query preferences
• Allow tailoring query results
• Query ranking when multiple resources are matched
• Context-sensitive application
• Context-aware
• Adjust its behavior when the context changes
• If resource discovery protocols are
  context-sensitive, then results are dependent
  upon the context of the query

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Discovery framework

• Persitent queries
• Synchronous matching service
• Asynchronous newly matching server
• Elvin engine (asynchronous messaging system -
  should try)
• Transient adversements
• Information is meaningful only at the time of
  advertisement
• Results are not stored
• Sub-queries
• Named queries

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Context-sensitive query
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Preference model and language
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Application iCarpark
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Application iCarpark - cont

• Issues
• Technologies
• Location direction
• RFID readers
• On-car computers
• Performances