1 Multimedia Services Service provider Service client Service registry Publish Find/discovery Bind Multimedia Services Framework and architecture

2 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): (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): (2006)

3 Reading paper - hint Introduction Problem Statement Architecture Drivers Related work Conclusions, future works Three MSOA

4 Movie information services Clients Services

5 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

6 Architectural Drivers Usability –Find and use services Portability Deployability –Client side deployment, e.g., installation Scalability –Business –System

7 Client-Server with Native Client Usability Protability Deployability Scalability

8 Client-Server with Mobile Java Client Usability Protability Deployability Scalability

9 Client-Server with Mobile Thin Client Usability Protability Deployability Scalability

10 Comparison

11 Movie information services Communications

12 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

13 MultiTEL Multimedia Service Architecture

14 IP Multimedia Subsystem (IMS) CSCF MRF AS MGCF MGW Application Layer Session Control Layer Connectivity Layer PSTN/PLMNIP Network HSS SIP H.248 DIAMETER SIP

15 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

16 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

17 IMS Protocols Media plane protocols –RTP –RTSP Security and authentication protocols –DIAMETER Sh interface

18 IMS Application Development

19 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

20 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

21 Smart client software layer

22 Movie Location Service

23 Service Flow of Movie Location Service

24 Movie Location Service Architecture

25 Movie Location Service Protocols Communication protocols between components Messaging Presence Streaming video Calendar …. Services Servers Clients provides uses

26 Movie Location Service User interface Application setup Additional applications

27 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 access- independent platform for service delivery Service provider Service client Service registry Publish Find/discovery Bind Compare with SOA???

28 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

29 Movie information services SOA vs. Middleware

30 Multimedia web services

31 Requirements

32 Three-tier framework

33 Comparison