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Next Generation Networks: Technologies, Services and Migration Strategies

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  1. Next Generation Networks: Technologies, Services and Migration Strategies Prof. Ahmed El Sherbini Dr. Omayma Abdel Mohsen National Telecommunication Institute Cairo-Egypt

  2. Agenda • Introduction • Existing Network Infrastructure and convergence towards the NGN • NGN: Definition and Architecture • NGN and Protocols • NGN Services • NGN Migration Strategies • NGN Techno-economic Aspects • Conclusion NGN:Technology,Services and Migration Strategies

  3. Introduction Today, telephony, the Internet, and the cellular mobile networks continue to be different domains, each has its own protocols and services. NGN will be the foundation for the creation of a new range of multimedia applications that takes full advantage of the characteristics of the broadband network and the “always on” capability. NGN:Technology,Services and Migration Strategies

  4. Existing Network Infrastructure and convergence toward the next generation network Today’s network is divided into: • The Public Switched Telephone Network, • The packet Switched Networks(e.g. the Internet) and • The Mobile networks. Convergence is the process of interconnection of traditional switched circuit networks (the PSTN and mobile networks) and packet-switched networks based on the Internet Protocol (IP) for routing. NGN:Technology,Services and Migration Strategies

  5. NGN Definition The term "Next Generation Networks" is wide-ranging and is interpreted variously by the broad variety of players involved in the communication business. NGN:Technology,Services and Migration Strategies

  6. NGN ETSI’s Definition “NGN is a concept for defining and deploying networks, which, due to their formal separation into different layers and planes and use of open interfaces, offers service providers and operators a platform which can evolve in a step by step manner to create, deploy and manage innovative services.” NGN:Technology,Services and Migration Strategies

  7. NGN Architecture • A basic architecture was defined comprising Network Elements needed for the provision of traditional Telephony services. • Each element has distinct roles within the network and is designed to integrate horizontally with other elements in the same layer, as well as vertically with the function-based elements of the other layers. • The Next Generation Networks architecture is based on four layers: Access layer, Core layer, Control layer and Service layer. NGN:Technology,Services and Migration Strategies

  8. NGN layers 1-Access layerelements includes different Media Gateways that support connection to and from the access network with the core network. 2-Core layer is the network handling converged services based on IP. 3-Control layer is the call server that provides call control functions and also provides the control of the Media Gateway. 4-Service layer is an IT platform that plays the role of an IN-SCE (Intelligent Network Service Creation Environment) extending their functionality in order to cover the new network scenarios NGN:Technology,Services and Migration Strategies

  9. NGN Components • The Media Gateway • The Call Server • The application Server • The Application Creation Environment • The Packet Network • The Access Networks NGN:Technology,Services and Migration Strategies

  10. NGN Architecture NGN:Technology,Services and Migration Strategies

  11. NGN and Protocols • Next Generation Networks require new protocols to support converged networks. • Requirements Support for legacy PSTN interworking, Migration Plan from legacy to NGN, High availability, Lifeline services and Scalability • With so many protocols, which one to choose? H.323,SIP(Session Initiation Protocol), MGCP(Media Gateway Control Protocol), SIGTRAN NGN:Technology,Services and Migration Strategies

  12. H.323 SIP MGCP/H.248/MEGACO Standards body ITU IETF MGCP/Megaco-IETF H.248 Architecture Distributed Distributed Centralized Current version H.323v4 RFC2543-bis07 MGCP1.0,MEGACO, H.248 Call Control Gatekeeper Proxy/Redirect Server Call Agent/Media Gateway Controller Endpoints Gateway, terminal User agent Media Gateway Signaling transport Transmission Control Protocol (TCP) Or User Datagram Protocol (UDP) TCP or UDP MGCP-UDP Megaco/H.248-both Multimedia capable Yes Yes Yes DTMF-relay transport H.245(signaling) or RFC 2833(media) RFC 2833 (media) or INFO(signaling) Signaling or RFC 2833(media) Fax-relay transport T.38 T.38 T.38 Supplemental services Provided by endpoints or call control Provided by endpoints or call control Provided by call agent NGN and Protocols NGN:Technology,Services and Migration Strategies

  13. Why should traditional telecommunications carriers care about NGN services ? If the public network carriers want to prosper in the new millenium, they must find ways to add value to their transport services: 1-NGNs will allow carriers’ networks to cost effectively support new suite of sophisticated services. 2-Help reduce costs by eliminating the inefficiencies of current service -specific, proprietary, and non reusable solutions. NGN:Technology,Services and Migration Strategies

  14. Why should traditional telecommunications carriers care about NGN services ? 3-Reduce the time to market and life-cycle costs of offering new services. 4-NGNs will enable carriers to deploy advanced services, allowing them to remain competitive as well as expand their capabilities to enter new markets. NGN:Technology,Services and Migration Strategies

  15. NGN Services Several services that will be important drivers in the NGN environment are: 1-Voice Telephony: e.g.Call Waiting, Call Forwarding, 3-Way Calling 2-Voice Portal: provide callers with anywhere, anytime access to information like news, weather, stock quotes, and account balances using simple voice commands and any telephone,.. 3-Data services: bandwidth-on-demand, connection reliability/resilient ,… NGN:Technology,Services and Migration Strategies

  16. NGN Services (cont.) 4-Multimedia services: This allows customers to converse with each other while displaying visual information. 5-Virtual Private Networks: allow large, geographically dispersed organizations to combine their existing private networks with portions of the PSTN, thus providing subscribers with uniform dialing capabilities. 6-Public Network Computing: Provides public network-based computing services for businesses and consumers (e.g, to host a web page, store/maintain/backup data files, or run a computing application). NGN:Technology,Services and Migration Strategies

  17. NGN Services (cont.) 7-Unified Messaging: Supports the delivery of voice mail, email, fax mail, and pages through common interfaces . 8-Information Brokering: Involves advertising, finding, and providing information to match consumers with providers. 9-E-Commerce: Allows consumers to purchase goods and services electronically over the network. 10-Call Center Services: A subscriber could place a call to a call center agent by clicking on a Web page. 11-Interactive gaming: Offers consumers a way to meet online and establish interactive gaming sessions. NGN:Technology,Services and Migration Strategies

  18. NGN Services (cont.) 12-Distributed Virtual Reality: Refers to technologically generated reperesentations of real-word events, people, places,experiences, etc., in which the participants in and providers of the virtual experience are physically distributed. 13-Home Manager: These services could monitor and control home security systems, energy systems, home entertainment systems, and other home appliances. NGN:Technology,Services and Migration Strategies

  19. NGN Migration Strategies There are a number of different views as where to start first as there are no hard and fast guidelines as to what each step should be. Two different views are presented: • Breaking the problem up into smaller pieces may indeed be one of the commercial solutions as each part can proceed under its own economic constraints and timeframe. • Modernizing the control of existing voice switches and their signaling networks in a step-by-step approach to moving towards a NGN model. NGN:Technology,Services and Migration Strategies

  20. NGN Migration Strategies Key considerations in the evolution It is important that these key benefits be delivered: •       Investment protection •        Operational and capital costs savings •        Carrier grade reliability •        Scalability •        Improved product selection/choices Speed of innovation and introduction of services NGN:Technology,Services and Migration Strategies

  21. Migration Strategies • EUROSCOM • SIEMENS • ALCATEL • LUCENT • ZTE NGN:Technology,Services and Migration Strategies

  22. EUROSCOM Migration Scenario One of the migration scenarios which breaks the problem into smaller part. The following network diagrams represent how the architectural model may be instantiated for some scenarios of interest to a network operator. Each figure displays the functions and interfaces required of each network scenario. For each interface, suggestions are provided as examples of typical inter-working protocols. NGN:Technology,Services and Migration Strategies

  23. EUROSCOM Migration Scenario PSTN to IP network interface scenario NGN:Technology,Services and Migration Strategies

  24. EUROSCOM Migration Scenario GSM PLMN (Mobile) to IP network NGN:Technology,Services and Migration Strategies

  25. Alcatel Migration Scenario Alcatel presents a step-by-step migration scenario from a TDM-based public switched telephone network to a packet based next generation network. Six steps consolidation and expansion scenario is elaborated : • PSTN for Voice and Internet Access. • PSTN Consolidation. • Voice over Packet Trunking (IP orATM). • Voice over Packet Access (ADSL, LMDS or cable) • Introduction of Multimedia • Migration to Full NGN NGN:Technology,Services and Migration Strategies

  26. Alcatel Full NGN NGN:Technology,Services and Migration Strategies

  27. Siemens Migration Scenario Siemens proposed a Next Generation Network migration Strategy based on class 4 and 5 softswitch replacement. First: migrate the transit level NGN:Technology,Services and Migration Strategies

  28. Siemens Migration Scenario Then introduce IP-based services NGN:Technology,Services and Migration Strategies

  29. Siemens Migration Scenario Finally – replace local switches NGN:Technology,Services and Migration Strategies

  30. Lucent Migration Scenarios First Scenario: Focus on Voice over BroadBand and minimize risk  Step 1: Start with VoBB solutions based on voice gateway Reuse existing TDM network and OAM infrastructure • QoS is manageable, avoid risks of softswitch technology • Get experience with various customer premises equipment(CPE) Get experience with commercial packaging and market acceptance Step2:        Migrate to full NGN solution        Get cost advantages of end-to-end VoIP solution Introduce more advanced NGN applications (SIP, application severs). NGN:Technology,Services and Migration Strategies

  31. Lucent Migration Scenario Second scenario: Focus on traffic offload and cost-effective gateways Step1: • Start with LSS-based ICD application for internet offload • Reuse dial-in gateways also for VoIP • Introduce VoIP backbone network • Step2: • Add VoIP endpoint support for Voice over Broadband • Introduce more advanced NGN applications (SIP, apllication servers) NGN:Technology,Services and Migration Strategies

  32. ZTE Migration Scenario ZTE produced two strategies for PSTN evolution based on softswitch network solutions. Strategy 1: Softswitch device together with Trunking Gateway carries out the functions of legacy tandem and toll exchanges whilst the Class 5 terminal exchange remains the same . Strategy 2: Softswitch devices together with Access Gateway carries out the functions of legacy terminal exchange while twisted pair user interface remains the same. NGN:Technology,Services and Migration Strategies

  33. ZTE Migration Scenario ZTE Evolution Strategy 1 of existing PSTN/ISDN NGN:Technology,Services and Migration Strategies

  34. ZTE Migration Scenario ZTE Evolution Strategy 2 of Existing PSTN/ISDN NGN:Technology,Services and Migration Strategies

  35. NGN Techno-economic Aspects There are at least six key techno-economic drivers for NGNs: •  Investment Protection • Costs (capital and operational) • Carrier grade reliability • Scalability • Improved product selection • Speed of innovation and introduction of services NGN:Technology,Services and Migration Strategies

  36. NGN Techno-economic Aspects Investment Protection: • Incorporating NGN components based upon standard, open protocols is the first step to protecting a carrier’s investment. • Interoperability with existing Operational Support Systems (OSS) is required before the NGN can actually be placed into service. NGN:Technology,Services and Migration Strategies

  37. NGN Techno-economic Aspects Costs (Capital and Operational): • Given the distributed nature of NGNs, and the incremental growth characteristic, capital budget management and growth planning are both simpler. • Since NGN solutions are premised upon open standards and are closely linked to Internet technologies, significant cost savings will occur over the life of the network. NGN:Technology,Services and Migration Strategies

  38. NGN Techno-economic Aspects Carrier Grade Reliability : • To achieve high level of reliability, equipment manufacturers and their carrier customers have developed products, architectures, and processes whose mission is focused on maximizing network uptime. • System reliability is also addressed by implementing “mated pairs”, i.e. redundant systems often operating in synchronization NGN:Technology,Services and Migration Strategies

  39. NGN Techno-economic Aspects Scalability: The NGN scales in a straightforward fashion, either by incrementally adding capacity to existing media gateways, or by adding media gateways. Enhanced Services can be introduced or expanded using existing Network Elements (NEs), such as SCPs(Signaling Control Points), or in the future by adding Feature/Application Servers, and Media Servers. NGN:Technology,Services and Migration Strategies

  40. NGN Techno-economic Aspects Improved Product Selection : Products that are standard-based will interoperate and offer carriers the best choices in technology, scalability, and price . Speed of innovation and introduction of services: • The most unproven reason for migration to NGN implementation is the ability of these new networks to support rapid introduction of new and different services. • If Internet technologies (ex. NG HTML, DNS, LDAP, etc.) are effectively used, rapid, innovative services may prove to be the most compelling reason for NGNs. NGN:Technology,Services and Migration Strategies

  41. Conclusion • The ultimate requirement of the next generation network is to handle packetized voice and data in a converged manner. • Next generation networks are not just a PSTN replacement but at a minimum they must provide the equivalent voice quality and reliability of today’s PSTN. • The NGN will be the foundation for the creation of a new range of multimedia applications that take full advantage of the characteristics of the broadband network and the “always on” capability NGN:Technology,Services and Migration Strategies

  42. Conclusion The users that are most ready to embrace the new opportunity will be the first to be migrated to the NGN model, this will then be a commercial migration with the emphasis being placed on new revenue opportunities. The creation of the NGN is no overnight transformation, but it is an evolution that is already underway and gathering pace. NGN:Technology,Services and Migration Strategies

  43. Thank You NGN:Technology,Services and Migration Strategies