Transcript Movie Location Service Architecture

Multimedia Services
Framework and architecture
Service
provider
Bind
Publish
Multimedia
Services
Service
registry
1
Find/discovery
Service
client
Course materials
• Framework and architecture
– Jilles van Gurp, Anssi Karhinen, Jan Bosch: Mobile Service
Oriented Architectures (MOSOA)
– Jia Zhang, Jen-Yao Chung: An open framework supporting
multimedia web services. Multimedia Tools Appl. 30(2): 149164 (2006)
– Vassilios N. Koukoulidis, Mehul Shah: The IP multimedia
domain: service architecture for the delivery of voice, data,
and next generation multimedia applications. Multimedia
Tools Appl. 28(1-2): 203-220 (2006)
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Reading paper - hint
Introduction
Related work
Problem Statement
Architecture Drivers
Three MSOA
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Conclusions, future works
Movie information services
Clients
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Services
Goals
• Number of devices
– Wide variety of devices
• Native features
– Software: text input
– Hardware: camera, screen
• Time to market
• Window of opportunity
– Services are available as devices on the market
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Architectural Drivers
• Usability
– Find and use services
• Portability
• Deployability
– Client side deployment, e.g., installation
• Scalability
– Business
– System
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Client-Server with Native Client
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Usability
Protability
Deployability
Scalability
Client-Server with Mobile Java Client
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Usability
Protability
Deployability
Scalability
Client-Server with Mobile Thin Client
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Usability
Protability
Deployability
Scalability
Comparison
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Movie information services
Communications
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IP Multimedia Subsystem (IMS)
Introduction
Network architecture
• IMS
• Standard org.
– Standard bodies
– Collaboration
• Protocols
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IMS application development
• Architecture
• Native vs. Java appl.
• Example
Operator benefits
MultiTEL Multimedia Service Architecture
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IP Multimedia Subsystem (IMS)
Application
Layer
AS
DIAMETER
Session
Control
Layer
HSS
CSCF
MRF
SIP
SIP
MGCF
SIP
MGW
Connectivity
Layer
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IP Network
PSTN/PLMN
H.248
IMS SIP Protocols
• Session control protocols SIP
–
–
–
–
Establish, modify and terminate multimedia sessions
Independent of the media being transported
SIP is based on an HTTP request/respond transaction model
Transport protocols TCP or UDP
• Main methods of SIP
• Works in close conjunction with Session Description
Protocol (SDP)
– Session level information
– Media level information
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Session Establishment
• Session initiation
– Discovery
• Delivery of session description
– SDP
• Session management
– Media stream
• Real Time Protocol (RTP)
• Real Time Streaming Protocol (RTSP)
• Session termination
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Multimedia
Data/System
IMS Protocols
• Media plane protocols
– RTP
– RTSP
• Security and authentication protocols
– DIAMETER
• Sh interface
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IMS Application Development
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SIP client/server architecture
• Call Session Control Function (CSCF)
– Proxy-CSCF (P-CSCF) is the first point of contact for users
with the IMS
• security of the messages between the network and the user and
allocating resources for the media flows
– Interrogating-CSCF (I-CSCF) is the first point of contact
from peered networks
• querying the HSS to determine the S-CSCF for a user
– Serving-CSCF (S-CSCF) is the central brain
• processing registrations to record the location of each user, user
authentication, and call processing
• operation of the S-CSCF is controlled by policy stored in the HSS
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SIP client/server architecture (cont)
• Home Subscriber Server (HSS)
– master user database that supports IMS network entities
that handle calls and sessions
– contains user profiles, performs authentication and
authorization of the user, and can provide information
about the physical location of user
• User Profile
– contains information about the current user
– the S-CSCF downloads it uses when a user is registering on
the network
• Sh application
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– interface allows an application server to communicate with
the HSS to extract the necessary data to dispatch the logic
of the service
Smart client software layer
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Movie Location Service
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Service Flow of Movie Location Service
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Movie Location Service Architecture
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Movie Location Service Protocols
• Communication protocols between components
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•
•
•
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Messaging
Presence
Streaming video
Calendar
….
Servers
provides
Services
uses
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Clients
Movie Location Service
• User interface
• Application setup
• Additional applications
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Movie Location Service
• Demonstrates a multimedia service
• IP multimedia subsystem
• Client-server architecture
• Originally designed for third-generation mobile
phones
• extended to handle access from WiFi networks and accessindependent platform for service delivery
Compare with SOA???
Publish
Service
registry
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Service
provider
Find/discovery
Bind
Service
client
Movie Location Services…
• Technology neutral
– Invocation mechanisms (protocols, descriptions, discovery)
should comply with accepted standard
• Loosely coupled
– Must not require knowledge at the service side
• Support location transparency
– Service can be discovered and invoked by clients
irrespective of their locations
• Simple and composite services
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Movie information services
SOA vs. Middleware
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Multimedia web services
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Requirements
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Three-tier framework
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Comparison
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