Session and media signaling for IPTV via IMS

ABSTRACT

As the IMS provides session establishment, QoS parameter negotiation, authentication and accounting it is an overlay architecture well qualified for session signaling concerning IPTV scenarios. The management of the signaling can be integrated as an application into an IPTV Application Server. The IPTV AS is further responsible for all necessary media signaling towards a proper IPTV media server. Such a media server is similar to the ordinary media server known from the voice centric IMS but additionally provides uni-cast, multicast and broadcast delivery of TV content which is placed by content providers. The media signaling requires a dedicated session description and can be provided by SIP or RTSP. The signaling between user and media server is orchestrated by a service-oriented-archietctue with a session manager acting as middleware. This middleware also provides interfaces for web services triggering IPTV session establishment via Parlay X gateway. This paper proposes a general IMS-based framework for delivering Live TV services over several access networks and presents the corresponding signaling flows for content enquiring and content switching as well as related delays. It furter presents an approach for using SIP and RTSP in cooperation for realizing VOD scenarios.

REFERENCES

• 1: IP Multimedia Subsystem (IMS); stage 2. 3GPP TS 23.228, Release 7 2006.
• 2: C. Riede, A. Al-Hezmi, T. Magedanz. Quadruple Play -- Session Management Enabler for Multimedia Streaming. 16th IST Mobile & Wireless Communications Summit, Budapest, Hungary, July 1--5, 2007.
• 3: T. Cagenius, A. Fasbender, J. Hjelm, U. Horn, I. M. Ivars, N. Selberg. Evolving the TV experience: Anytime, anywhere, any device. Ericsson Review, no. 03, 2006.
• 4: B. Chatras, M. Said. Delivering Quadruple Play with IPTV over IMS. International Conference on Intelligence in Networks (ICIN) 2007, Bordeaux, France.
• 5: H. Schulzrinne, G. Camarillo, A. R. Johnston, J. Peterson, R. Sparks, M. Handley and E. Schooler. SIP: Session Initiation Protocol. IETF RFC 3261, June 2002.
• 6: H. Schulzrinne , A. Rao , R. Lanphier, Real Time Streaming Protocol (RTSP), RFC Editor, 1998
• 7: K. Knuettel, T. Magedanz, L. Xie. SIP Servlet Execution Environment (SIPSee) -- An approved IMS SIP Application Server for Converged Applications. International Conference on Intelligence in Networks (ICIN) 2006, Bordeaux, France, pages 147--152, May 2006.
• 8: FOKUS Open IMS Playground. http://www.fokus.fraunhofer.de/ims
• 9: FOKUS Media Interoperability Lab. http://www.mediainteroperabilitylab.org
• 10: SIPp. http://sipp.sourceforge.net.
• 11: ITU-T. One-way transmission time. ITU-T Recommendation G.114, May 2003.

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.2 Network Protocols
          Subjects: Applications (SMTP, FTP, etc.)

Additional Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS
      C.2.1 Network Architecture and Design
          Subjects: Network communications

General Terms:
Management

Keywords:
IMS, IPTV, RTSP, SIP, media signaling, session signaling