ENGENHARIA DE SERVIÇOS SERVICES ENGINEERING

Transcrição

1 Mestrado em Engenharia de Redes de Comunicações MSc in Communication Networks Engineering ENGENHARIA DE SERVIÇOS SERVICES ENGINEERING Cenários de Mudança 1 - Setting the Context 1 1

2 Outline Some history leading to present networks Value-added services in fixed & mobile networks 2

3 Some History By : Environment Monopolistic Deregulation Competition Technology VLSI Microprocessor Moore s Law Rampant Software Engineering Circuit Switching Electro- Mechanical Digital Switching & Control ISDN Packet Switching ARPANET X.25 TCP/IP ATM Frame Relay IP Dominance Mobile Networks First Generation Analogue 2G 2nd Generation Digital (Voice) 3G 3rd Generation IP Mobile Data Value-Added Services Supplementary Services IN-based Services Transmission PDH on radio or coaxial cable Fibre Optics SDH / SONET DWDM 3

4 A Fixed Perspective* Next Generation Broadband is the term used to describe broadband delivered over both advanced copper wires and fibre-optic cables. * British Telecom 4

5 A Mixed Perspective* EE (Everything Everywhere) is the company that runs the Orange and T-Mobile brands in the UK, and will be launching its new superfast 4G brand EE. Its 4G service will cover a third of the population by the end of 2012 and its fibre service will be available to more than 11 million households and businesses by the end of the year. EE s mobile service currently provides coverage to 99% of the population with 2G and 98% of the population with 3G. 5

6 Traditional Service Models 6

7 Traditional Service Models Communications Networks and Services Fixed Networks (Wired or Wireless) Public Switched Telephone Network (PSTN) Rede de Serviço Telefónico Fixo Internet Access Provider (IAP) Rede de Serviço de Acesso à Internet (IAP) (ADSL) Cable Network Rede de Cabo (Hybrid Fiber-Coax) Mobile Networks Mobile Network Operator Serviço Móvel Terrestre (SMT) Public Address Mobile Radio (PAMR) Serviço Móvel de Recursos Partilhados (SMRP) Mobile Virtual Network Operator (MVNO) Operador de Rede Móvel Virtual 7

8 Traditional Service Models Communications Services Network Reseller (Leased-Line Service Provider) Serviço de Circuitos Alugados Broadcaster Operador de Serviços de Difusão 8

9 Converged Service Models Convergent Service Providers 3Play Service on Fixed Wireless Access (FWA) 3Play Service on ADSL 3Play Service on hybrid FFTx (Fiber Coax) 4Play Service on mixed Fixed/Wireless (WiMax/WiFi/3G/LTE and ADSL) 9

10 Fixed Networks for Voice and Data Complex, expensive, restrictive... The antithesis of the Ethernet Copper PSTN PSTN Leased Lines Fibre K/stream DSL Acess SDH ATM IP Acess PDH SDH VC-12 SDH VC-4 PDH End User ~2k sites ~1k sites ~500k sites ~200 sites ~20 sites ~5 sites 10

11 Cable Networks Complex Infrastructure 11

12 Early Mobile Networks Mainly focused on Voice Services 12

13 2G & 3G UMTS Mobile Networks Complex Architecture on the Core 13

14 3G/cdma2000 Mobile Networks Complex Architecture on the Core 14

15 Analog and Digital Trunking (TETRA) systems Mobile to Dispatch Trunk Dispatch PABX PSTN Mobile to Mobile Data Communications Group Call Voice Communications Trunk Host Computer Dispatcher *PAMR-Public Address Mobile Radio (SMRP-Serviço Móvel Recursos Partilhados) Telemetry Pager Signaling Long Data 15

16 Present ICT Networks and Services Public Switched Telecommunications Network Fixed and mobile voice with Value-added Services Access to data networks (user-server) Classical Intelligent Network (IN) Services Internet World wide IP transport network Distinctive services: , Web, File transfer, Streaming Enterprise Networking Private networks based on switched circuit telephony Private networks based on Internet technology Switched interconnection networks ATM, Carrier Ethernet, IP Leased Line Network 16

17 PSTN Physical & Functional Abstractions 17

18 PSTN Signaling Network: SS7 Signaling System # 7 The nodes of a telecommunication network (exchanges, processing nodes, etc.) which communicate with each other using SS7 are called Signaling Points (SPs). Signaling links interconnect Signaling Points. Signaling links are the dedicated channels used to transfer the signaling information between the Signaling Points. One Signaling Point can transfer the signaling information for many speech circuits. A collection of signaling links directly connecting two Signaling Points is called a signaling linkset (set of signaling links). 18

19 SS7 Architectural Elements SP Signaling Point SCP Signaling Control point STP Signaling Transfer Point 19

20 Signaling System No 7: Layered View 20

21 Business Drivers in mid-1990s Telcos positioning themselves in competitive markets; Use differentiation services as competitive tool; An endless set of service possibilities exists, some could be killer applications ; The need for rapid creation of services, reducing the lead time from conception to use of a new service; Move toward value-based pricing of services rather than cost-based; Separation of network operator and service provider where appropriate; Telcos operate in a multi-vendor environment. 21

22 The Dawn of the Stupid Network "Keep it Simple, Stupid," is an engineering virtue. The Intelligent Network (IN), is anything but simple; it is a marketing concept for scarce, complicated, highpriced services, surrounded by features like 800 service, call waiting, and automatic calling card validation. The age of centralized control is ending with the rise of the next generation of Internet. A new network "philosophy and architecture" is replacing the vision of an Intelligent Network. The vision in which the public communications network is engineered for "always-on" use, not intermittence and scarcity. It would be engineered for intelligence at the enduser's device, not in the network. 22

23 The Rise of the Stupid Network The the network is engineered to simply "Deliver the Bits, Stupid! not for fancy network routing or "smart" number translation. Fundamentally, it would be a Stupid Network. In the Stupid Network, the data tells the network where it needs to go. In contrast, in the Intelligent Network, it is the network that tells the data where to go.) In a Stupid Network, the Data on it is the Boss. The Stupid Network is in fact the All IP Broadband Network we currently know. 23

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25 References and Readings Websites: British Telecom - Next Generation Broadband Building the Carrier-Class IP Next-Generation Network, products_white_paper0900aecd802e2a52.shtml Documents: H. Hanrahan, Chapter 1: Setting the Context for Evolution and Convergence of Networks in Network Convergence: Services, Applications, Transport, and Operations Support, John Wiley & Sons, 2007 M. El-Sayed, J Jaffe, A View of Telecommunications Network Evolution, IEEE Communications Magazine, December 2002 W. Mohr, W. Konhäuser, Access Network Evolution Beyond Third Generation Mobile Communications, IEEE Communications Magazine, December

26 References and Readings Documents: R. Wood, Next-Generation Network Services, Cisco Press, 2005 V. K. Gurbani and X.-H. Sun, "2: Internet Telephony: The Evolution to a Service-Oriented Architecture," in Architecting the Telecommunication Evolution, Cisco Press, 2005 M. H. Reeve, C. Bilton, P. E. Holmes, M. Bross, Networks And Systems For BT In The 21st Century, IEE Communication Engineer, October/ November