What is NGN? Hamid R. Rabiee Mostafa Salehi, Fatemeh Dabiran, Hoda Ayatollahi Spring 2011
Outlines Next Generation Network (NGN) Definition Applications Requirements Network Architecture QoS Issues 2
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 (12/2004): General overview of NGN Y.2011 (10/2004): General principles and general reference model for NGN 3
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 servicerelated 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 4
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 5
Why NGN? Flexibility for service building and offering Expectation of cost reductions by sharing infrastructure and systems Simplification of O&M, thus lowering OPEX. Use of open interfaces leads for: quick deployment of services and applications new services (third parties) 6
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 7
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 8
Drivers and motivation for NGN deployment External drivers and internal motivation put pressure on operators NGN deployments Drivers massive growth of data traffic flat growth of voice market massive access competition maturity of IP technology open standards and architectures Operators Motivation develop new services easier and faster enhance flexibility reduce operational expenditures replace of old platforms at their end of lifecycle Deployment of Next Generation Network 9
NGN Applications www access (browsing, information, e-commerce ) VoIP Video calling Video on Demand (VoD) Broadcast television (IPTV, unicast, multicast) Multimedia Messaging Games 10
NGN Applications 11
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 12
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 13
Basic Concepts of NGN A Next Generation Network can be defined by six key criteria. integration of existing infrastructure application focused - access independent packetoriented network NGN concept separation into different layers using open interfaces support broad variety of services openness and flexibility regarding new services 14
One schematic view of NGN 15
Main idea! 16
NGN Layers 17
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 18
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 19
Network Architecture 20
Network Elements 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 21
Network Elements 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). 22
Network Elements H.248 Protocol SIP 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 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). 23
Network Elements 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 CAC BGP 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. 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 Border Gateway Protocol to negotiate flow routing procedures and capacities across different NGN network domains 24
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 25
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 26
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 delivering "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. 27
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 28
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 29
ETSI-TISPAN TISPAN is an ETSI technical committee, dealing with fixed networks and the migration from circuit switched networks to packet-based networks (Telecoms & Internet converged /service & Protocols for Advanced Networks (TISPAN) TISPAAN also deals with service aspects, architectural aspects, protocol aspects, QoS studies, security related studies, mobility aspects within fixed networks, using existing and emerging technologies. TISPAN outcomes much-anticipated-basis for international standards & specifications for FMC 30
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 31
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 32
Next Session QoS Control Mechanisms 33