what is ngn?ce.sharif.edu/courses/91-92/2/ce873-1/resources/root/class notes/mmn_lec6-ngn.pdfbased...

What is NGN?

Hamid R. Rabiee

Spring 2013

Digital Media Lab - Sharif University of Technology �

Outlines

! Next Generation Network (NGN) !  Definition

!  Applications

!  Requirements !  Network Architecture

!  QoS

!  Issues

What is NGN?

!  The network of 10 years from now won’t be the network of today.

!  Our goal for this session is to consider some ideas which may influence

what the Internet of the future will be.

!  ITU-T SERIES Y: GLOBAL INFORMATION INFRUSTRUCTURE,

INTERNET PROTOCOL ASPECTS AND NEXT GENERATION

NETWORKS !  Y.2001: General overview of NGN

!  Y.2011: General principles and general reference model for NGN


NGN Definitions

!  NGN Definition (Y.2001): A packet based network able to provide

telecommunication services and able to make use of multiple

broadband, QoS-enabled transport technologies and in which service-

related functions are independent from underlying transport-related

technologies

!  Practical description (ETSI): the convergence of the public switched

telephone network, the voice network, the wireless network (Wi-Fi,

WiMAX, GSM,..) and the data network

!  IP based packet switched network that provides a single network

capable of carrying any and all services


NGN Concepts

!  A multi-service network able to support voice, data and video

!  A network with a control plane (signaling, control) separated from the

transport/switching plane

!  A network with open interfaces between transport, control and

applications

!  A network using packet mode technology to transport of all kind of

information

!  A network with guaranteed QoS for different traffic types and SLAs (SLA refers to service-level agreement)


Why NGN?

! Flexibility for service building and offering

! Expectation of cost reductions by sharing infrastructure

and systems

! Simplification in

!  (Operation and Manipulation)

!  lowering OPEX.

! Use of open interfaces leads for: !  quick deployment of services and applications

!  new services (third parties)


Existing Telecommunications

!  Benefits

!  Worked well for stand-alone systems

!  Challenges

!  Many networks= high operational and interworking costs

!  Slow to introduce new services

!  Users require different devices for different services

Difficult to integrate new services or technologies


Emerging Telecommunications

!  Benefits

!  Rapid service deployment= new service revenues

!  Allowed continued growth of network

!  Flexible architecture for future growth and new technologies

!  Allows for competition at individual layers

!  Challenges

!  Legacy policy frameworks are challenged by the emerging telecommunications

model throughout the world

Digital Media Lab - Sharif University of Technology

Drivers and motivation for NGN deployment

!  External drivers and internal motivation put pressure on operators’

NGN deployments

Digital Media Lab - Sharif University of Technology

"  develop new services easier and faster

"  enhance flexibility "  reduce operational

expenditures "  replace of old platforms at

their end of lifecycle

"  massive growth of data traffic

"  flat growth of voice market "  massive access competition "  maturity of IP technology "  open standards and

architectures

Deployment of Next Generation Network

Operators’ Motivation Drivers

NGN Applications

!  www access (browsing, information, e-commerce…)

!  VoIP

!  Video calling

!  Video on Demand (VoD)

!  Broadcast television (IPTV, unicast, multicast)

!  Multimedia Messaging

!  Games

!  …

Digital Media Lab - Sharif University of Technology ��

NGN Applications


NGN Requirements

!  Business Continuity required to maintain ongoing dominant services

and customers that require carrier-grade service

!  Flexibility to incorporate existing new services and react quickly to the

ones that appear on real time (main advantage of IP mode)

!  Profitability to allow feasible return on investments and in the best

practices market values

!  Privacy and security to ensure appropriate use and also protection of

information


NGN Requirements

!  Survivability to allow service assurance in case of failures and external

unexpected events

!  Quality of Service to guarantee the Service Level Agreements for

different traffic mixes, conditions and overload.

!  Interoperability across networks to allow to carry end to end services

for flows in different network domains


Basic Concepts of NGN

!  A Next Generation Network can be defined by six key criteria.


NGN concept

integration of existing

infrastructure

packet-oriented network

support broad

variety of services

openness and

flexibility regarding

new services

separation into different layers using

open interfaces

application focused - access

independent

One schematic view of NGN


Main idea!


NGN Layers


NGN layers and functions

!  Application layer enables the provisioning of services and provides the

control and logic for the execution of services

!  Control layer controls the elements of the network, establishes and

tears down media connections !  Access Independent layer is responsible for the transport of media and

signaling messages !  Access Dependent layer connects customer networks or terminals with

the components of the NGN network and aggregate the dedicated traffic type

!  Management layer covers network management ensuring service fulfillment, service assurance and billing


Customer & Operator benefits

! Customer benefits ! device independence ! access independence ! service variety ! enhanced usability

! Operator/ Provider benefits ! new revenue potential ! improves time-to-market ! easy integration of 3rd party services ! one platform for voice, data and multimedia


Network Architecture


Network Architecture(cont.)

!  Packet based networks !  Trend is to use IP based networks over various transport possibilities (ATM, SDH,

WDM…)

!  IP based networks must offer guarantees of Quality of Service (QoS) regarding the

real time characteristics of voice, video and multimedia

!  Access Gateways !  Allows the connection of subscriber lines to the packet network

!  Converts the traffic flows of analogue access (Pots) or 2 Mb/s access devices into

packets

!  Provides subscriber access to NGN network and services

!  Trunking Gateways !  Allows interworking between classical TDM telephony network and Packet-based NGN

networks,

!  Converts TDM circuits/ trunks (64kbps) flows into data packets, and vice versa



!  Soft switch/MGC !  referred to as the Call Agent or Media Gateway Controller (MGC)

!  provides the “service delivery control” within the network in charge of Call

Control and handling of Media Gateways control (Access and/or Trunking) via H.

248 protocol

!  performs signaling gateway functionality or uses a signaling gateway for

interworking with PSTN N7 signaling network

!  provides connection to Intelligent Network /applications servers to offer the

same services as those available to TDM subscribers

!  Application Server (AS)

!  A unit that supports service execution, e.g. to control Call Servers and NGN

special resources (e.g. media server, message server).



!  H.248 Protocol !  Known also as MEGACO: standard protocol, defined by ITU-T, for signaling and

session management needed during a communication between a media

gateway, and the media gateway controller managing it

!  H.248/MEGACO allows to set up, keep, and terminate calls between multiple

endpoints as between telephone subscribers using the TDM

!  SIP

!  Session Initiation Protocol in order to handle call establishment, maintenance

and termination from packet mode terminals.

!  Signaling Gateway (SG)

!  A unit that provides signaling conversion between the NGN and the other

networks (e.g. STP in SS7).



!  ENUM !  Electronic NUMbering: Protocol that allows to establish a correspondance between

the traditional telafone numbering (E.164 ) and the network addresses related to the

packet mode networks ( RFC 2916 "E.164 number and DNS" IETF).

!  MPLS !  Multiprotocol Label Switch or protocol that assigns labels to information packets in

order to allow the node routers to treat and route flows in the network paths according

to established priority for each category.

!  CAC !  Call Acceptance Control function in order to accept/reject traffic in the network that

allows guarantee of QoS for services with a Service Level Agreement

!  BGP !  Border Gateway Protocol to negotiate flow routing procedures and capacities across

different NGN network domains


Areas of interest for NGN standards activity

!  International Telecommunications Union (ITU-T) !  Telecommunication Standardization Advisory Group (TSAG)

!  Study Groups (SG13 lead SG for NGN)

!  NGN Global Standards Initiative (NGN-GSI), since Jan 2006

!  European Telecommunications Standards Institute (ETSI) !  TISPAN, 3GPP / IMS

!  Internet Engineering Task Force (IETF)

!  Protocols (IP, SIP, MGCP, ENUM, etc)

!  Global Standards Collaboration (GSC)

!  Asia-Pacific Economic Cooperation (APEC) Telecommunications and

Information Working Group APEC TEL


Defining Standards

!  Smaller industry for a have helped shape international standards. !  IETF have developed many of the core NGN technologies (IP, MPLS, SIP, etc.)

!  3GPP integrated IP-based technologies into a building block of the NGN, IP

Multimedia Subsystem (IMS)

!  Release based (ETSI TISPAN r1, 3GPP r7, ITU NGN r1-3)

!  ITU involvement is necessary at the international level to define an

evolutionary framework to help solve interworking, mobility and service

definitions issues, but…

!  There could be more pro-active cooperation between the ‘telco’ and

internet stakeholders


IP Multimedia Subsystem (IMS)

!  What is the IP Multimedia Subsystem?

!  An architectural framework for delivering IP multimedia services in the

3GPP environment

!  Part of the 3GPP (and 3GPP2: MMD) vision for evolving mobile networks

beyond GSM

!  Original formulation (Rel-5) an approach to deliver "Internet services" over

GPRS

!  Updated by 3GPP, 3GPP2, TISPAN through including support of other

access network technologies, e.g., Wireless LAN, CDMA2000, fixed line,

xDSL, etc.


IP Multimedia Subsystem (IMS)

!  IMS builds on IETF protocols

!  Based upon SIP, SDP, COPs and Diameter protocols

!  3GPP have enhanced these IETF protocols for mobility

!  IMS in short…

!  Open-system architecture that supports a range of I-based services over

the PS domain, employing both wireless and fixed access technologies


IMS Layers

!  IMS consists of three planes: !  Application plane

!  Control plane (or core IMS): The IMS

control plane is used in the service

stratum

!  IP transport plane: Resource

control and admission based on the

negotiated QoS parameters are

mainly executed in the transport

stratum


NGN Competition Issues

!  Market power and network effects

!  Implications for existing and future customer access services

!  Any-to-any connectivity

!  Interconnect

!  Charging models for multiple providers in an E2E service

!  Pricing

!  Standards

!  Australian Competition and Consumer Commission (ACCC) has

begun canvassing some of the issues in discussion with stakeholders

and public


Longer-term NGN Issues

!  Implications for competition policy

!  Jurisdiction and extraterritoriality

!  Privacy and security

!  Digital rights management

!  Access and interoperability

!  Common standards

!  Consumer interests

!  International and domestic governance issues

!  Scope for industry self-regulation


Next Session

QoS Control Mechanisms

�� Digital Media Lab - Sharif University of Technology

what is ngn?ce.sharif.edu/courses/91-92/2/ce873-1/resources/root/class notes/mmn_lec6-ngn.pdfbased...

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