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									   Next Generation
Networks: Technologies,
Services and Migration

       Prof. Ahmed El Sherbini
       Dr. Omayma Abdel Mohsen
 National Telecommunication Institute
• 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   2

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   3
Existing Network Infrastructure and
convergence toward the next generation

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   4
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   5
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   6
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   7
NGN layers
1-Access layer elements 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 Strategies
             NGN:Technology,Services and Migration        8
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   9
NGN Architecture

               Application Creation Environment


               Call                         Call
               Server                       Server

               Media                       Media
   Access                    Packet                      Access
               Gateway                     Gateway
   Network                   Network                     Network

             NGN:Technology,Services and Migration Strategies      10
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),
           NGN:Technology,Services and Migration Strategies   11
NGN and Protocols
                  H.323                  SIP                             MGCP/H.248/MEGACO

Standards body    ITU                    IETF                            MGCP/Megaco-IETF

Architecture      Distributed            Distributed                     Centralized

Current version   H.323v4                RFC2543-bis07                   MGCP1.0,MEGACO

Call Control      Gatekeeper             Proxy/Redirect Server           Call Agent/Media Gateway

Endpoints         Gateway, terminal      User agent                      Media Gateway

Signaling         Transmission Control   TCP or UDP                      MGCP-UDP
transport         Protocol (TCP                                          Megaco/H.248-both
                  Or User Datagram
                  Protocol (UDP
Multimedia        Yes                    Yes                             Yes

DTMF-relay        H.245(signaling) or    RFC 2833 (media) or             Signaling or RFC 2833(media
transport         RFC 2833(media         INFO(signaling

Fax-relay         T.38                   T.38                            T.38

Supplemental      Provided by            Provided by endpoints or call   Provided by call agent
services          endpoints or call      control

                   NGN:Technology,Services and Migration Strategies                                    12
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
2-Help reduce costs by eliminating the
   inefficiencies of current service -specific,
   proprietary, and non reusable solutions.
           NGN:Technology,Services and Migration Strategies   13
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

            NGN:Technology,Services and Migration Strategies   14
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   15
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   16
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
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   17
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
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   18
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   19
NGN Migration Strategies
  Key considerations in the evolution
It is important that these key benefits be
•     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 20
Migration Strategies

•   ZTE

        NGN:Technology,Services and Migration Strategies   21
EUROSCOM Migration
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
           NGN:Technology,Services and Migration Strategies   22
 EUROSCOM Migration

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

GSM PLMN (Mobile) to IP network
      NGN:Technology,Services and Migration Strategies   24
Alcatel Migration
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   25
Alcatel Full NGN

     NGN:Technology,Services and Migration Strategies   26
Siemens Migration

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   27
Siemens Migration
Then introduce IP-based services

       NGN:Technology,Services and Migration Strategies   28
Siemens Migration
Finally – replace local switches

      NGN:Technology,Services and Migration Strategies   29
Lucent Migration
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
     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 30
Lucent Migration
Second scenario: Focus on traffic offload and cost-
   effective gateways
• Start with LSS-based ICD application for internet
• 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   31
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   32
ZTE Migration Scenario

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

ZTE Evolution Strategy 2 of Existing PSTN/ISDN

           NGN:Technology,Services and Migration Strategies   34
NGN Techno-economic
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
           NGN:Technology,Services and Migration Strategies   35
NGN Techno-economic
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   36
NGN Techno-economic
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   37
NGN Techno-economic

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   38
NGN Techno-economic
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   39
NGN Techno-economic
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
• If Internet technologies (ex. NG HTML, DNS, LDAP,
  etc.) are effectively used, rapid, innovative services may
               the most compelling reason for
  prove to beNGN:Technology,Services and Migration Strategies NGNs. 40
• 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 41
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   42
Thank You

 NGN:Technology,Services and Migration Strategies   43

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