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Next Generation Networks

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  • 03/17/13
  • 03/17/13
  • 03/17/13
  • 03/17/13
  • 03/17/13
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  • Ngn

    1. 1. NEXT GENERATION NEXT GENERATIONNETWORKS (NGN) AND IMSNETWORKS (NGN) AND IMS • What is NGN? • Need for NGN • Objectives of NGN • Fundamental characteristics of NGN • Challenges of NGN • Architecture of NGN • IP Multimedia Subsystem (IMS) Hafeth Dawbaa 228/2009
    2. 2. What is NGN?• A Next Generation Network (NGN) is a packet-based network able to provide Telecommunication Services to users and able to make use of multiple broadband, QoS- enabled transport technologies and in which service- related functions are independent of the underlying transport-related technologies. It enables unfettered access for users to networks and to competing service providers and services of their choice. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users. ITU-T REC. Y.2001 (12/2004) March 17, 2013 2
    3. 3. • The next-generation network (NGN) is body of key architectural changes in telecommunication core and access networks. The general idea behind the NGN is that one network transports all information and services (voice, data, and all sorts of media such as video) by encapsulating these into packets, similar to those used on the Internet. NGNs are commonly built around the Internet Protocol, and therefore the term all IP is also sometimes used to describe the transformation toward NGN. March 17, 2013 3
    4. 4. Main architectural changes that NGN involves• In the core network, NGN implies a consolidation of several (dedicated or overlay) transport networks each historically built for a different service into one core transport network (often based on IP and Ethernet). It implies amongst others the migration of voice from a circuit-switched architecture (PSTN) to VoIP, and also migration of legacy services such as X.25, frame relay (either commercial migration of the customer to a new service like IP VPN, or technical emigration by emulation of the "legacy service" on the NGN).• In the wired access network, NGN implies the migration from the dual system of legacy voice next to xDSL setup in local exchanges to a converged setup in which the DSLAMs integrate voice ports or VoIP, making it possible to remove the voice switching infrastructure from the exchange.• In the cable access network, NGN convergence implies migration of constant bit rate voice to CableLabs PacketCable standards that provide VoIP and SIP services. Both services ride over DOCSIS as the cable data layer standard. March 17, 2013 4
    5. 5. Emerging of need for a comprehensive network March 17, 2013 5
    6. 6. March 17, 2013 6
    7. 7. Objectives of NGN• promote fair competition• encourage private investment• define a framework for architecture and capabilities to be able to meet various regulatory requirements• provide open access to networks• ensuring universal provision and access to services• promoting equality of opportunity to the citizen• promoting diversity of content, including cultural and linguistic diversity• recognizing the necessity of worldwide cooperation with particular attention to less developed countries March 17, 2013 7
    8. 8. Fundamental characteristics of NGN• packet-based transfer• decoupling of service provision from transport• support for a wide range of services  real time, streaming, non-real time and multimedia• broadband capabilities with end-to-end QoS• generalized mobility• The ability for the user or other mobile entities to communicate interworking with legacy networks via open interfaces• and access services irrespective of changes of location or unrestricted access by users to different service of location or and access services irrespective of changes providers technical environment. The degree of service availability may ……• converged services between fixed/mobile depend on several factors including Access Network• capabilities, service level agreements between the users independence of service-related functions from underlying transport technologies visited network (if applicable), etc. home network and the• support of multiplethe ability of telecommunication with or Mobility includes last-mile technologies without service continuity. March 17, 2013 8
    9. 9. March 17, 2013 9
    10. 10. Challenges of NGN• The quality of service (QoS)• The management challenge• The transition challenge• The security challenge• The economic challenge March 17, 2013 10
    11. 11. NGN Architecture Next → March 17, 2013 11