1 multimedia services service provider service client service registry publish find/discovery bind...

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Multimedia Services

Service provider

Service client

Service registry

Publish

Find/discovery

Bind

MultimediaServices

Framework and architecture

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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): 149-164 (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

Problem Statement

Architecture Drivers

Related work

Conclusions, future worksThree MSOA

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Movie information services

Clients

Services

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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

UsabilityProtabilityDeployabilityScalability

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Client-Server with Mobile Java Client


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Client-Server with Mobile Thin Client


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Comparison

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Communications

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IP Multimedia Subsystem (IMS)

Introduction

Network architecture• IMS• Standard org.

– Standard bodies

– Collaboration

• Protocols

IMS application development• Architecture• Native vs. Java appl.• Example

Operator benefits

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MultiTEL Multimedia Service Architecture

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IP Multimedia Subsystem (IMS)

CSCF

MRF

AS

MGCF

MGW

ApplicationLayer

Session ControlLayer

ConnectivityLayer

PSTN/PLMNIP Network

HSSSIP

H.248

DIAMETER

SIP

SIP

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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

Multimedia Data/System

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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– interface allows an application server to communicate with

the HSS to extract the necessary data to dispatch the logic of the service

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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• Messaging• Presence• Streaming video• Calendar• ….

Services

Servers

Clients

provides

uses

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• User interface• Application setup• Additional applications

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• 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 access-

independent platform for service delivery

Service provider

Service client

Service registry

Publish

Find/discovery

BindCompare with SOA???

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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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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

1 multimedia services service provider service client service registry publish find/discovery bind...

Documents