Next generation networks




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International Telecommunication Union










ITU-T

Technical Paper




TELECOMMUNICATION
STANDARDIZATION SECTOR
OF ITU

(1 March 2013)






SERIES Y.2000:

NEXT GENERATION NETWORKS






Migration scenarios from legacy networks to NGN in developing countries






Foreword


This Technical Paper is developed by Mr Chaesub Lee.
Contents

Page

Foreword i

Summary 1

Introduction 1

1 Scope 2

2 Definitions 2

3 Abbreviations 3

4 Features of Legacy Telecommunication networks 4

4.1 Scope of Legacy Telecommunication Networks 4

4.2 Public Switched Telephone Networks 5

4.3 Packet Switched Data networks 6

4.4 Integrated Services Digital Networks 7

5 Features of NGN 10

5.1 NGN definition and characteristics 10

5.2 NGN Requirements 11

5.3 NGN Functional Architecture 13

5.4 Service aspects of NGN 16

5.5 Two types of NGN 18



6 Gaps between Legacy Networks and NGN 19

6.1 Technology Gaps 19

6.2 Architectural Gaps 21

6.3 Service Gaps 24

6.4 Operational Gaps 25

6.5 System Gaps 26



7 NGN capabilities for migration 26

7.1 Emulation capability 26

7.2 Simulation capability 26

7.3 Interworking between Emulation and Simulation capability 27



8 Migration scenarios 28

8.1 Generic migration scenarios 28

8.2 Overlay scenario 29

8.3 Replacement scenario 30



9 Considerations identify the scenario 31

9.1 General considerations 31

9.2 Technical considerations 32

9.3 Service considerations 36

9.4 Status of legacy networks 37

9.5 Regulatory considerations 38

9.6 Business considerations 43

10 Choose the scenario 44

10.1 Overlay Scenario 44

10.2 Replacement Scenario 44

References and Bibliography 46





List of Figures

Figure 1 – Overall configuration model of PSTN Error: Reference source not found

Figure 2 – Detailed configuration model of PSTN Error: Reference source not found

Figure 3 – Overall configuration model of PSDN Error: Reference source not found

Figure 4 – Architecture model of ISDN Error: Reference source not found

Figure 5 – Overall configuration model of ISDN Error: Reference source not found

Figure 6 – Basic NGN Architecture Error: Reference source not found

Figure 7 – NGN Reference Architecture Error: Reference source not found

Figure 8 – Change of service environments of NGN Error: Reference source not found

Figure 9 – Service coverage of NGN with ubiquitous features Error: Reference source not found

Figure 10 – Various technologies used in Legacy Networks Error: Reference source not found

Figure 11 – Technical gaps of Legacy Networks and NGN Error: Reference source not found

Figure 12 – Differences in Vertical Architectures Error: Reference source not found

Figure 13 – Hierarchical Architecture of Legacy Networks Error: Reference source not found

Figure 14 – Hierarchical Architecture model of NGN Error: Reference source not found

Figure 15 – Reduction of operational complexity Error: Reference source not found

Figure 16 – Configuration of NGN Emulation Error: Reference source not found

Figure 17 – Configurations of NGN Simulation Error: Reference source not found

Figure 18 – Interworking between NGN Emulation and Simulation Error: Reference source not found

Figure 19 – Interworking NGN Simulation with Legacy IP Error: Reference source not found

Figure 20 – General views of migration scenario Error: Reference source not found

Figure 21 – Overlay scenario Error: Reference source not found

Figure 22 – Replacement scenario Error: Reference source not found

Figure 23 – Scope of considerations for migration Error: Reference source not found

Figure 24 – Core network structure during migration Error: Reference source not found

Figure 25 – Migration in MDF site Error: Reference source not found

Figure 26 – Scope of Business considerations Error: Reference source not found

ITU-T Technical Paper

Migration scenarios from legacy networks to NGN in developing countries

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