International telecommunication union
IMT-2020 interworking scenarios with legacy IMT networks
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- Contributors (in Alphabetical Order)
- Acknowledgement
- Appendix II
IMT-2020 interworking scenarios with legacy IMT networksThe current IMT networks has been developed through an evolutionary path starting from circuit-based wireless networks to full IP-based mobile networks. The evolutionary approach of mobile networks with the aim of providing seamless continuity among the networks has significantly increased the complexity of the current mobile packet core. The IMT-2020 core network is envisioned as an access agnostic common core network which will bring a significant change to make it easier to interwork with a variety of new radio access technologies. However, the tight coupled interworking of an IMT-2020 network with legacy IMT networks will still bring the similar or even more complexity. IMT-2020 network is expected to be designed with the consideration of Wi-Fi and fixed networks with emerging IMT-2020 RAN as basic access networks which will be seamlessly integrated into an IMT-2020 network. However, we need to provide existing IMT networks a migration path to IMT-2020. As the first option, legacy IMT networks are connected to an IMT-2020 network through an interworking function, which means that the IP session continuity between IMT-2020 and legacy networks can be provided but service continuity should be supported at higher layer solutions. In the second option, evolved IMT networks are directly connected to an IMT-2020 network while providing backward compatibility for mobile devices that only support legacy IMT networks. In this case, IP session continuity as well as service continuity between IMT-2020 and legacy networks can be provided. 
Figure . IMT-2020 interworking options.
This is the list of all contributors who submitted any written form of comments or contributions.
AcknowledgementThis work was partially supported by the European Union 7th Framework Program DOLFIN project (“Data centres optimization for energy-efficient and environmentally friendly internet”; http://www.dolfin-fp7.eu), the EU H2020 5G PPP projects: 5GEX (“5G Multi-Domain Exchange” ; https://5g-ppp.eu/5GEx) and SONATA ( “Service Programing and Orchestration for Virtualized Software Networks”; https://5g-ppp.eu/sonata/) and the European Space Agency (ESA) INSTINCT project (“Scenarios for integration of satellite components in future networks”; https://artes.esa.int/projects/instinct). Appendix IINetwork Softwarization for IMT-2020 networksEditor’s Note: Appendix II was produced during the FG-IMT 2020 focus group in order to investigate gaps in standardization related to IMT-2020. While the request from SG-13 was to deliver a report outlining standardization gaps, the consensus of the focus group was that the working documents produced and used during the focus group work contained useful information for future work and should be captured. Note, however, the focus group concentrated on producing accurate descriptions of the standardization gaps in the main body of this document; some minor errors may exist in the appendices. They are, however, the output of the focus group but are provided for information only. Editor’s Note: This appendix uses clause references in a form usually associated for normative text. This is maintained for this report to align with references made in the main body of this report. This document is the deliverable of Network Softwarization for IMT-2020 networks. It contains all the revision proposed in the editorial meeting of 27-30 October2015. The structure of this document is as follows: Section 2 presents the relevant references; Section 3 presents the terms defined in this document and the terms defined elsewhere used in this document; Section 4 presents the abbreviations; Section 5 states that there are no conventions used in this document; Section 6 presents the network softwarization and its main features including: Motivations; Relevant Use Cases; Overview of network softwarization; Characteristics of network softwarization; Energy management aspects of Network softwarization and Economic incentive aspects of network softwarization. It includes the related standardisation gaps analysis; Sections 7, 8, 9 present the technology areas that would utilize network softwarization technologies in 5G mobile networks (e.g. Integrated Network Management and Orchestration; Mobile Edge Computing; Distributed Cloud for Service Providers; In-network Processing; Resource Usage Optimization; Resource Abstraction; Migration towards softwarized networks, RAN Virtualization; Capability Exposure) including the related standardization gaps analysis; Clause 17.1 presents satellite networks aspects of network softwarization; Clause 17.2 presents legacy reduction techniques; Clause 17.3 presents Standardization efforts of Mobile Edge Computing; Clause 17.4 presents supplemental figures on network softwarization; Acknowledgement and Contributors list are completing this document.
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