Next Generation Networks: Technologies, Services and Migration

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Transcript Next Generation Networks: Technologies, Services and Migration

Next Generation
Networks: Technologies,
Services and Migration
Strategies
Prof. Ahmed El Sherbini
Dr. Omayma Abdel Mohsen
National Telecommunication Institute
Cairo-Egypt
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
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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.
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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 packetswitched networks based on the Internet
Protocol (IP) for routing.
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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.
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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.”
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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 functionbased elements of the other layers.
• The Next Generation Networks architecture is
based on four layers: Access layer, Core layer,
Control layer and Service layer.
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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
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NGN Components
• The Media Gateway
• The Call Server
• The application Server
• The Application Creation Environment
• The Packet Network
• The Access Networks
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NGN Architecture
Application Creation Environment
Application
Server
Call
Server
Access
Network
Media
Gateway
Call
Server
Packet
Network
Media
Gateway
Access
Network
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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
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NGN and Protocols
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
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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.
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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.
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NGN Services
Several services that will be important drivers in the NGN
environment are:
1-Voice Telephony: e.g.Call Waiting, Call Forwarding, 3Way 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 ,…
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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 networkbased computing services for businesses and consumers
(e.g, to host a web page, store/maintain/backup data
files, or run a computing application).
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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.
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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.
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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.
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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
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Migration Strategies
•
•
•
•
•
EUROSCOM
SIEMENS
ALCATEL
LUCENT
ZTE
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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.
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EUROSCOM Migration
Scenario
PSTN to IP network
interface scenario
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EUROSCOM Migration
Scenario
GSM PLMN (Mobile) to IP network
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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
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Alcatel Full NGN
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Siemens Migration
Scenario
Siemens proposed a Next Generation
Network migration Strategy based on class
4 and 5 softswitch replacement.
First: migrate the transit level
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Siemens Migration
Scenario
Then introduce IP-based
services
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Siemens Migration
Scenario
Finally – replace local switches
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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).
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Lucent Migration
Scenario
Second scenario: Focus on traffic offload and costeffective 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)
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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.
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ZTE Migration Scenario
ZTE Evolution Strategy 1 of existing PSTN/ISDN
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ZTE Migration Scenario
ZTE Evolution Strategy 2 of Existing PSTN/ISDN
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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
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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.
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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.
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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
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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.
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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 beNGN:Technology,Services
the most compelling
reason for NGNs.
and Migration Strategies
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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
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the “always
on” capability
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.
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Thank You
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