International telecommunication union
Appendix I High-level network architecture for IMT-2020
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Appendix IHigh-level network architecture for IMT-2020Editor’s Note: Appendix I 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 is the final output document for the high-level network architecture for IMT-2020, which will be integrated into a report to be submitted to SG13 plenary as a result of Focus Group on IMT-2020. This work has been done with the help of many contributors from various organizations. We appreciate all the contributors for the active works to improve this document.
This document describes the high-level view of network architecture for IMT-2020 including requirements, gap analyses, and design principles of IMT-2020 with the aim of giving directions to the relevant Study Groups in ITU-T in developing standards on network architecture in IMT-2020. It should be noted that this document is based on the related works in ITU-R and other SDOs.
The following ITU-T Recommendations and other references contain provisions, which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editors indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is published regularly. Note – The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation.
This deliverable defines the following terms: Peak data rate is maximum achievable data rate under ideal conditions per user/device (in Gbit/s). User experienced data rate is achievable data rate that is available ubiquitously4 across the coverage area to a mobile user/device (in Mbit/s or Gbit/s). Latency is the contribution by the network to the time from when the source sends a packet to when the destination receives it (in ms). Mobility in performance target point of view is the maximum speed at which a defined QoS and seamless transfer between radio nodes which may belong to different layers and/or radio access technologies (multi-layer/-RAT) can be achieved (in km/h). Connection density is a total number of connected and/or accessible devices per unit area (per km2). Energy efficiency is energy efficiency has two aspects:
Spectrum efficiency is average data throughput per unit of spectrum resource and per cell5 (bit/s/Hz). Area traffic capacity is total traffic throughput served per geographic area (in Mbit/s/m2). This deliverables defines the following abbreviations: AAA Authentication, Authorization, Accounting APN Application Network AR Augmented Reality CGF Converged Gateway Function GW Gateway ICN Information Centric Networking IMT International Mobile Telecommunications IoT Internet of Things IP Internet Protocol KPI Key Performance Index LWA LTE/WiFi Link Aggregation NFV Network Function Virtualization MNO Mobile Network Operator MTC Machine Type Communication NAS Non-Access Stratum PGW Packet Data Network Gateway QoE Quality of Experience RAT Radio Access Technology SDN Software Defined Networking TWAG Trusted Wireless Access Gateway UCF Unified Control Function UE User Equipment UHD Ultra High Definition UE User Equipment UHD Ultra High Definition VNF Virtual Network Function
In this clause, we review several use cases among others where IMT-2020 is used to enhance the services and/or IMT-2020 should be enhanced to support the services.
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