May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 1

ITU / BDT ITU / BDT RegionalRegional SeminarSeminarFixed Mobile Convergence and Guidelines on the smooth transition of existing mobile networks to

IMT-2000

Nairobi, Kenya, 9 Nairobi, Kenya, 9 –– 12 May 200512 May 2005

Network Architecture consolidation in the evolutiontowards NGN

Oscar González SotoITU Consultant Expert

Strategic Planning and Assessment

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 2

NetworkNetwork Architecture towardsArchitecture towards NGNNGNContent Content

• Key factors for the evolution towards NGN• Services and revenue motivations. Requirements

• Network architecture consolidation at transit, local and access levels• Topology and migration

• Network optimization based on planning methods and tools• Support to Business and Design

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 3

Network Architecture Network Architecture towardstowards NGNNGNKey Factors: MotivationKey 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

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 4

Network Architecture Network Architecture towardstowards NGNNGNKey Factors: Operator Requirements(I)Key Factors: Operator Requirements(I)

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

• Profitability to allow feasible return on investments and in the best practices market values

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 5

Network Architecture Network Architecture towardstowards NGNNGNKey Factors: Operator Requirements (II)Key Factors: Operator Requirements (II)

• Survivabilty to allow service assurance in case of failures and externalunexpected events

• Quality of Service to guarantee the Service Level Agreements for different traffic mixes, conditions and overload.

• Interoperabilty across networks to allow to carry end to end services for flows in different network domains

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 6

NetworkNetwork Architecture towardsArchitecture towards NGNNGNContent Content

• Key factors for the evolution towards NGN• Services and revenue motivations. Requirements

• Network architecture consolidation at transit, local and access levels• Topology and migration

• Network optimization based on planning methods and tools• Support to Business and Design

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 7

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: TopologyArchitecture 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

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 8

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: TopologyArchitecture Consolidation: Topology

What changes from current scenario towards target network ?

OtherNetworks

DLC

Control

Transport/Media Distributed Switching

DSL

Wirelessgateway

Softswitch

OSS Services

PacketNetwork

IP/MPLS/CAC

Accessgateway

Accessgateway

Accessgateway

Trunkgateway

SCP

TDM

POTS ISDN

RSU

LEX/TEX

LEX

PCM

DataATM/IP

MUX/DSLAM

NMC

SS7

HDSL/XDSL

NAS

Mob

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 9

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: NGN LayersArchitecture Consolidation: NGN Layers

NetworkIndependent

Services

Legacy Network Signaling/Service

Legacy Network Media

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 10

StructureSimplification

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: TopologyArchitecture Consolidation: Topology

TRANSIT NETWORKTRANSIT NETWORK

NATIONAL LAYERNATIONAL LAYER

REGIONAL LAYERREGIONAL LAYER

RULAYER

LEXLAYER

Single-layered

TRANSIT NETWORK

Single-layered

TRANSIT NETWORKNATIONAL/REGIONAL

LAYER

NATIONAL/REGIONAL

LAYER

RULAYER

LEX/GWLAYER

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 11

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: AccessArchitecture 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

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 12

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Architecture Consolidation: WirelineWireline Access Access

Local: ~ 40 km Distribution: mean value ~1,7 km Drop: mean value ~300 m

Typical historical Access Network structure

SDF

SDF

SDF

FDFmain cable

branching cablesdrop line

MDF

.

...

NTBA

LEX

LEX Local ExchangeMDF Main Distribution FrameFDF Feeder Distribution FrameSDF Subscriber Distribution Frame

SDF

drop line

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 13

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Access Architecture Consolidation: Access

evolutionevolutionTypical Access Network evolutionLocal: ~ 40 km Distribution: mean value ~1,7 km Drop: mean value ~300 m

SDF

SDF

SDF

DLC

branching cablesdrop line

OpticalInterface

.

.

.

...

NTBA

LEX/GW

LEX Local ExchangeGW GatewayMDF Main Distribution FrameDLC Digital Loop Carrier SDF Subscriber Distribution FrameFO Fiber Optic

DLC

DLCdrop line .

.

FO

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 14

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: LocalArchitecture 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 geo-scenarios and geographical distribution

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 15

Network Architecture towards NGNArchitecture Consolidation: LocalLocal

Access gateway

LEX LayerLEX Layer

Exchange A

Packet mode

network

Trunkinggateway IP links

Exchange A subscriber “Growth”

Trunkinggateway

Access gateway

TEX LayerTEX Layer

Softwitches/ MGCslocated in few sites

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 16

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: CoreArchitecture 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 and survivability

• Importance of the optimization for location and interconnection

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 17

Network Architecture Network Architecture towardstowards NGNNGNArchitecture ConsolidationArchitecture Consolidation: Core: Core

Local Exchanges

Remote Units

LEX LayerLEX Layer

Trunking gateway in each regional site

Packet mode

networkIP links

short distance

Regional LevelRegional Level

Softwitches /MGCs

in few sites

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 18

Network Architecture Network Architecture towardstowards NGNNGNArchitecture ConsolidationArchitecture Consolidation: Core: Core

Local Exchanges

Remote Units

LEX LayerLEX Layer

Trunking gateway in each local site

Packet mode

network

IP links

Long distance

Regional layerRegional layer

Softswitches/MGCslocated in few sites

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 19

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Combined SegmentsArchitecture 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 expansionNGN solution :

- Cap and Grow; this means keeping the existing PSTN network as it is, and grow demand with NGN equipment

Network replacementReplacement 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

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 20

Smooth migration to NGNSmooth migration to NGNNetwork Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Combined Segments (I)Architecture Consolidation: Combined Segments (I)

MultiserviceNode

AccessAccess

CustomersCustomers

CoreCorePSTN Class 4

Subscriber unit

RSP

DS

DataMux

IN

EdgeEdgePSTN Class 5

SSP

InternationalInternationalCoreCore

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 21

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Combined Segments (II) Architecture Consolidation: Combined Segments (II)

Multiservicenode

AccessAccess

CustomersCustomers

CoreCore

Subscriber unit

MM

NGCR Optical

AGW

Softswitch

AssociatedTK GW

EdgeEdge

International International CoreCore

NGER

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 22

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Combined SegmentsArchitecture Consolidation: Combined Segments

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

Overall impact of evolution on network CAPEX and OPEX

Key factors for the evaluation: Geo-scenarios, Network grow rates, Aging of equipment, New services

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 23

Network Architecture Network Architecture towardstowards NGNNGNArchitecture Consolidation: Scenario evaluationArchitecture Consolidation: Scenario evaluation

• Net Present Value (NPV) for the overall migration project is the best global evaluator

A large variety of country scenarios and transition strategies generate major differences in the economical results Planning to be performed per

country and operator

NPV for C4 Scenario in alternative A

(25 000)

(20 000)

(15 000)

(10 000)

(5 000)

-

5 000

10 000

15 000

20 000

2004 2005 2006 2007 2008

delta CAPEXOpex savingscumulated DCF

NPV for C5 Scenario in alternative B

(250 000)

(200 000)

(150 000)

(100 000)

(50 000)

-

50 000

2004 2005 2006 2007 2008

delta CAPEXOpex savingscumulated DCF

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 24

NetworkNetwork ArchitectureArchitecture towardstowards NGNNGNContent Content

• Key factors for the evolution towards NGN• Services and revenue motivations. Requirements

• Network architecture consolidation at transit, local and access levels• Topology and migration

• Network optimization based on planning methods and tools• Support to Business and Design

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 25

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: BusinessSupport tools: Business

• Required functionality for Business tools

- Service Demand Projection- Dynamic modeling for technology substitution and migration rates- Dimensioning multiple flows (circuit and packet modes)- Evaluation of network resources and associated investment

(CAPEX)- Evaluation of revenues for given tariffs and installation rate- Modeling multiple resource lifetimes- Modeling of demand elasticity to tariffs- Interrelation between network growth and operational cost (OPEX)- Cost assignment as a function of utilization rates- Generation of standard financial results like Cash Flow, Profit &

Loss, Balance Sheet, NPV, IRR, etc.

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 26

Activity Flow in STEM to evaluate migration alternatives:

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: BusinessSupport tools: Business

IncrementalDemandfor service

TotalIncrementalDemand forResources

IncrementalResourceSupply

Production& Costingof Resources

ResourceDepreciation &Decommissioning

TariffandRevenue

Servicecosts &charges

Other costs(Admin/mkt)

TariffPolicy

DemandParameters

ReplacementOf Resources

Resources Costs(And trends)

Input data

Phase ofcalculation

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 27

Type of STEM tool results

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: BusinessSupport tools: Business

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 28

Type of STEM tool results

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: BusinessSupport tools: Business

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 29

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: Design and OptimizationSupport 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

• Configuring the network elements (IP router)

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 30

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: Design and OptimizationSupport tools: Design and Optimization

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 31

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: Design and OptimizationSupport tools: Design and Optimization

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 32

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: Design and OptimizationSupport tools: Design and Optimization

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 33

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: Design and OptimizationSupport tools: Design and Optimization

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 34

Network Architecture Network Architecture towardstowards NGNNGNSupport tools: Design and OptimizationSupport tools: Design and Optimization

May 9-12 ITU/BDT Network Architecture Consolidation - O.G.S. Lecture - 1.4.1 - slide 35

Network Architecture Network Architecture towardstowards NGNNGNSummary of Key FactorsSummary of Key Factors

• 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

• Design financial performance with best business practices: compare and optimise NPV.