Migration towards NGN
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- Marlene Wilson
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1 ITU/BDT Regional Seminar on Costs and Tariffs for Member Countries of the Tariff Group for Africa (TAF) Midrand,, South Africa, 28 June-1 1 July 2005 Migration towards NGN Oscar González Soto ITU Consultant Expert Strategic Planning and Assessment June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 1
2 Migration towards NGN Content Key factors for the evolution towards NGN Services and revenue motivations. Network architecture consolidation at transit, local and access levels Topology and migration Network optimization based on planning methods and tools Support to Network Design June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 2
3 Key Factors: Motivation New services and revenue increase with multimedia services: - Compensate voice revenue reduction and increase BB related business Cost reductions by sharing network infrastructure and systems - Savings are a function of network scenario, equipment modernization status and customers grow speed Simplification of O&M, thus lowering OPEX - Integrated operation platforms, maintenance and training June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 3
4 Key Factors: Issues to care Ensure service and business continuity for existing customers. Introduction of new services based on profitability Interworking with existing PSTN and other operator's networks QoS for guaranteed services and critical business customers Tariff principles as a function of market demand and consumption of network resources (Backward Cost Assignment) Universal Service Obligations for basic services and internet June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 4
5 Key Factors: Questions When to start network migration? Short term versus long term versus combined per network segment Where to start? Access versus local versus transit versus applications How to perform migration? Overlay versus substitution versus new sub-networks at growing areas June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 5
6 Key Factors: Country Status Diversity of Geo-scenarios in customers density and development level: homogeneous versus heterogeneous Development level for accessibility, fixed services, mobile services and video Aging of installed equipment for Outside Plant, Transmission and Switching Competition level for fixed and mobile services Regulatory status June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 6
7 Content Key factors for the evolution towards NGN Services and revenue motivations Network architecture consolidation at transit, local and access levels Topology and migration Network optimization based on planning methods and tools Support to Network Design June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 7
8 Architecture Consolidation: Topology Topological changes impact on infrastructure and are slower to implement than technology substitution Less network nodes and links due to the higher capacity of systems (one order of magnitude). Same capilarity at access level due to identical customer location Topological connectivity higher for high capacity nodes and paths for security High protection level and diversity paths/sources in all high capacity systems, both at functional and physical levels June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 8
9 Architecture Consolidation: Topology What changes from current scenario towards target network? SCP NMC OSS Services SS7 Mob Control Softswitch LEX/TEX LEX TDM NAS Data ATM/IP Transport/Media Access gateway Packet Network IP/MPLS/CAC Distributed Switching Trunk gateway Other Networks POTS RSU PCM ISDN MUX/DSLAM HDSL/XDSL Access gateway DSL Wireless gateway Access gateway DLC June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 9
10 Architecture Consolidation: Topology TRANSIT NETWORK NATIONAL NATIONAL LAYER REGIONAL REGIONAL LAYER LEX LAYER RU LAYER NATIONAL/REGIONAL Single-layered Single-layered LAYER LAYER TRANSIT TRANSIT NETWORK NETWORK Customers LAYER Structure Simplification LEX/GW LAYER RU LAYER Customers LAYER June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 10
11 Architecture Consolidation: Access Access dominated by physical infrastructure cost and deployment time Quick deployment of DSL and Multimedia Services FO closer to customer when implementing new outside plant or renovating existing one New Wireless technologies for low density customer scenarios Shorter LL length than classical network to be prepared for high bandwidth Multimedia services June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 11
12 Architecture Consolidation: Wireline Access Typical historical Access Network structure Local: ~ 40 km Distribution: mean value ~1,7 km Drop: mean value ~300 m main cable branching cables FDF. SDF SDF drop line. MDF SDF NTBA LEX SDF drop line LEX MDF FDF SDF Local Exchange Main Distribution Frame Feeder Distribution Frame Subscriber Distribution Frame June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 12
13 Architecture Consolidation: Access evolution Typical Access Network evolution Local: ~ 40 km Distribution: mean value ~1,7 km Drop: mean value ~300 m FO branching cables. DLC. SDF SDF drop line. LEX/GW Optical Interface DLC drop line.. SDF NTBA LEX GW MDF DLC SDF FO Local Exchange Gateway Main Distribution Frame Digital Loop Carrier Subscriber Distribution Frame Fiber Optic DLC June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 13
14 Architecture Consolidation: Local Dominated by functions migration investment and interoperability Move from joint switching and control to separated control and media GW Introduce Multimedia Services at all areas Optimize number, location of nodes and interfaces among existing and new network Requires longer time and higher investments due to variety of geoscenarios and geographical distribution June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 14
15 Architecture Consolidation: Local Softwitches/ MGCs located in few sites Trunking gateway Access gateway TEX Layer Trunking gateway Packet mode network IP links Access gateway LEX Layer Exchange A Exchange A subscriber Growth June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 15
16 Architecture Consolidation: Core Dominated by high capacity and protection level Overlay deployment for full coverage in all regions Quick deployment needed for homogeneous end to end connections Strong requirements for high quality, protection, diversity paths and survivability Importance of the optimization for location and interconnection June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 16
17 Architecture Consolidation: : Core Softwitches /MGCs in few sites Trunking gateway in each regional site IP links Packet mode network Regional Level short distance LEX Layer Local Exchanges Remote Units June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 17
18 Architecture Consolidation: : Core Softswitches/MGCs located in few sites IP links Long distance Packet mode network Regional layer Trunking gateway in each local site LEX Layer Local Exchanges Remote Units June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 18
19 Architecture Consolidation: Combined Segments Where to start and how to co-ordinate migration? Network consolidation Cost Optimisation of the network - Reducing nodes and increase their capacity - Deployment of ADSL and multiservice access Network expansion NGN solution : - Cap and Grow; this means keeping the existing PSTN network as it is, and grow demand with NGN equipment Network replacement Replacement of out-phased (end of life) TDM equipment - gradual replacement : this means coexistence of the two technologies - full accelerated replacement with a short transition period Need to optimize overall network evolution: technically and economically June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 19
20 Network Architecture Smooth Smooth towards migration migration NGN to NGN to NGN Architecture Consolidation: Combined Segments (I) RSP Data Mux DS SSP IN PSTN Class 4 Core International Core Multiservice Node Subscriber unit PSTN Class 5 Access Edge Customers June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 20
21 Architecture Consolidation: Combined Segments (II) Softswitch AGW Multiservice node NGER Associated TK GW NGCR MM Subscriber unit Optical Access Core Edge International Core Customers June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 21
22 Architecture Consolidation: Combined Segments Overall impact of evolution on network CAPEX and OPEX CAPEX TDM and NGN CAPEX are close NGN CAPEX in the first years driven by geographic coverage Access systems represent a large part of CAPEX similar values in TDM and NGN OPEX OPEX in NGN trends to be lower Migration scenarios will have a mix of TDM OPEX (installed base) and NGN OPEX (substitution and growth) Significant impact of manpower cost due to convergence in operations Key factors for the evaluation: Geo-scenarios, Network grow rates, Aging of equipment, New services June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 22
23 Architecture Consolidation: Scenario evaluation Net Present Value (NPV) for the overall migration project is the best global evaluator NPV for C4 Scenario in alternative A NPV for C5 Scenario in alternative B (5 000) delta CAPEX Opex savings cumulated DCF (50 000) ( ) delta CAPEX Opex savings cumulated DCF (10 000) ( ) (15 000) (20 000) ( ) (25 000) ( ) A large variety of country scenarios and transition strategies generate major differences in the economical results Planning to be performed per country and operator June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 23
24 Content Key factors for the evolution towards NGN Services and revenue motivations Network architecture consolidation at transit, local and access levels Topology and migration Network optimization based on planning methods and tools Support to Network Design June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 24
25 Support tools: Design and Optimization Required functionality for Technical design tools Service demands characterisation and traffics for VoIP and NGN multiservice flows Conceptual Network Design and Capacity Planning Comparison of different network structures Routing flows for most typical cases including OSPF, shortest path, widest path and weighted cost functions. Optimizing locations and connections of network gateways Cost, Performance and Reliability Analysis Estimation of investment costs for the rollout and the extension of the investigated multi-service network Estimation of end-to-end delays Technical Site and System Planning Allocation of the IP or MPLS links Formation of virtual networks Routing over ATM links or PDH/SDH systems or tunneling via other IP links Sub-networking and addressing June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 25
26 Example of Design Supporting tools June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 26
27 Example of Design Supporting tools June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 27
28 Example of Design Supporting tools June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 28
29 Example of Design Supporting tools June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 29
30 Example of Design Supporting tools June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 30
31 Summary of Evolution Factors Ensure service continuity Plan business and services first, later the network with proven solutions. Implement pilot cases before network migration Differentiation to competitors on new services and quality June 2005 ITU/BDT Migration towards NGN - O.G.S. - slide 31
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