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Content for  TR 28.801  Word version:  15.1.0

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0  IntroductionWord‑p. 9
Network slicing is a key feature for the next generation network. It is about transforming the network/system from a static "one size fits all" paradigm, to a new paradigm where logical networks/partitions are created, with appropriate isolation, resources and optimized topology to serve a particular purpose or service category (e.g. use case/traffic category, or for internal reasons) or even individual customers (logical system created "on demand"). It can be enriched by use of NFV and SDN.
The network slicing concept consists of 3 layers:
  1. Service Instance Layer,
  2. Network Slice Instance Layer, and
  3. Resource layer where each layer requires management functions, see reference TR 23.799. This document specifies use cases for management of network slicing, potential requirements, potential solutions and recommendations.
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1  ScopeWord‑p. 10
The present document investigates and makes recommendations on management and orchestration for network slicing on the Network Slice Instance Layer [2] and for non-virtualised NE's also the Resource layer:
  1. Use cases and requirements for management and orchestration of network slicing
  2. Management and orchestration terminology and concepts for slices. The relationship between network slice management and orchestration concepts developed in the present document and the management and orchestration concepts defined by ETSI NFV.
  3. Management of network function sharing in the context of network slicing (e.g. network function sharing support, and lifecycle management functions of the mobile network resources for network slices).
  4. Impacts to management when a slice instance is shared between multiple parties (e.g. multiple partners and multiple domains etc.) based on the slice sharing, see reference TR 23.799.
  5. Isolation of management data between different parties within a slice instance if needed.
  6. Impacts derived from Management of 3GPP Network Slices on the ETSI MANO architecture and procedures.
  7. Automation of management and orchestration of network slice instances and the related policy configurations.
  8. Management and orchestration mechanisms to support the isolation/separation of mobile network resources used by different network slice instances and the corresponding configuration of isolation/separation.
  9. Solution for management and orchestration of network slicing and how it affects the specifications (e.g. Interface IRPs, Network Resource models and trace specifications).
Furthermore, the 3GPP role for Service Instance Layer has been investigated.
The Resource layer for VNFs is excluded from the present document.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TR 23.799: "3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Study on Architecture for Next Generation System (Release 14)"
[3]
TR 22.864: "Feasibility Study on new Services and Markets Technology Enablers - Network Operation v14.0.0."
[4]
NGMN 5G WS P1 Sub: Task Network Management and Orchestration, v2.6.0.
[5]
NGMN Alliance: "Description of Network Slicing Concept", Version 1.0, January 13, 2016 (http://www.ngmn.org/publications/technical.html).
[6]
TS 28.500: "Telecommunication management; Management concept, architecture and requirements for mobile networks that include virtualized network functions".
[7]
TS 23.501: "Technical Specification Group Services and Systems Aspects; System Architecture for the 5G system; Stage 2".
[8]
TR 38.801: " Technical Specification Group Radio Access Network; Study on new radio access technology: Radio access architecture and interfaces".
[9]
TS 32.130: "Telecommunication management; Network sharing; Concepts and requirements".
[10]
TS 23.502: " Technical Specification Group Services and Systems Aspects; Procedures for the 5G system; Stage 2".
[11]
TS 32.101: "Telecommunication management; Principles and high level requirements".
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3  Definitions and abbreviationsWord‑p. 11

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
network slice instance:
a set of network functions and the resources for these network functions which are arranged and configured, forming a complete logical network to meet certain network characteristics.
network slice subnet instance:
a set of network functions and the resources for these network functions which are arranged and configured to form a logical network.
network slice subnet template:
description of the structure (and contained components) and configuration of the network slice subnet.
network slice template:
description of the structure (and contained components) and configuration of a network slice.
physical resource isolation:
regime of resource management when a physical resource used by one network slice instance cannot be shared with another network slice instance.
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3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
MANO
Management and Orchestration
NF
Network Function (as defined in [2])
NFV
Network Functions Virtualisation
NSI
Network Slice Instance
NSMF
Network Slice Management Function
NSSAI
Network Slice Selection Assistance Information
NST
Network Slice Template
NSST
Network Slice Subnet Template
NSSI
Network Slice Subnet Instance
NSSMF
Network Slice Subnet Management Function
CSMF
Communication Service Management Function
VNF
Virtualized Network Function
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