ISO/IEC 21559-2:2023

INTERNATIONAL ISO/IEC
STANDARD 21559-2
First edition
2023-01
Telecommunications and information
exchange between systems — Future
network protocols and mechanisms —
Part 2:
Proxy model-based quality of service
Télécommunications et échange d'informations entre systèmes —
Futurs protocoles et mécanismes de réseau —
Partie 2: Qualité de service basée sur un modèle de proxy
Reference number
© ISO/IEC 2023
© ISO/IEC 2023
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© ISO/IEC 2023 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 2
4 Protocol mechanisms in BFS . 3
4.1 Description of BFS . 3
4.2 General interactive nature for FHR . 4
4.2.1 FNProxy pairing situations . 4
4.2.2 Active and passive functions of FNProxy . 4
4.2.3 Interaction model of BFS with engines. 4
4.2.4 FPDU definition of BFS . 6
4.2.5 Strategy processing scheme in FNProxy . 8
4.2.6 Concept of the procedures in BFS . . 9
4.2.7 Function invoke descriptions to domains of FNQoS system .12
5 Protocol mechanisms in SFS .12
5.1 Description of SFS . 12
5.2 Operations by using operator in SFS . 13
5.3 Service transition by FNProxy strategy or FLM . 15
5.3.1 Description of FLM for FIB . 15
5.3.2 FNProxy strategy or FLM determining the service transition .15
5.4 Sequence diagram overview related to SFS . 16
5.4.1 General description of sequence diagram to SFS . 16
5.4.2 Main elements in the sequence diagram . 17
5.5 Narrative of AI dynamically enabling interaction . 18
5.5.1 General . 18
5.5.2 Dynamism caused by FNProxy link topology change . 19
5.5.3 Dynamism by driving the external environment .20
5.6 General framework of SFSP . .20
Annex A (informative) Representation reference of FNProxy collaboration effects .24
Annex B (informative) Bi-S operator Example between two FNProxies with C++.29
Annex C (informative) Methods for the domains .31
Annex D (informative) FNProxy Link Modes (FLMs) for SFS .33
Annex E (informative) Collaboration between FNQoS systems .35
Annex F (informative) Multi FNProxies making effect of dynamic MFHR .36
Annex G (informative) Avoiding SFS infinite transitions and overservice .37
Annex H (informative) General framework of FNQoS protocol .40
Bibliography .43
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© ISO/IEC 2023 – All rights reserved

Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical
activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
The procedures used to develop this document and those intended for its further maintenance
are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria
needed for the different types of document should be noted. This document was drafted in
accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives or
www.iec.ch/members_experts/refdocs).
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent
rights. Details of any patent rights identified during the development of the document will be in the
Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC
list of patent declarations received (see https://patents.iec.ch).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see
www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards.
This document was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology,
Subcommittee SC 6, Telecommunications and information exchange between systems.
A list of all parts in the ISO/IEC 21559 series can be found on the ISO and IEC websites.
Any feedback or questions on this document should be directed to the user’s national standards
body. A complete listing of these bodies can be found at www.iso.org/members.html and
www.iec.ch/national-committees.
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© ISO/IEC 2023 – All rights reserved

Introduction
This document and ISO/IEC 21558-2 both pertain to the Future Network (FN), which is a broad concept
and has a wide application. The FNProxy technology introduced by ISO/IEC 21558-2 enables the
future network quality of service (FNQoS), which makes the FNQoS appear to be a mutual relationship
between intelligent FNProxies (i.e. harmonization between machines), not like the micro effect of
traditional QoS which depends on parameters.
The fact that FNProxy can promote the evolution of QoS to harmonize the process of networking. It
provides new forms of networking besides new concepts of QoS. This can lead to the emergence of new
industry trends in the field of systems interconnection technology.
This document specifies three engines (perception, negotiation and execution) to support the effective
work of FNProxy. This document also describes protocol mechanisms for synchronous interaction
between two FNProxies and among multiple FNProxies. Also, conditions and requirements for service
transitions between/among FNProxies are described. Annex A gives the quantitative calculation
method (harmonization between FNProxies) of interaction QoS effect, which can be used as a starting
point reference for developers to improve the calculation method.
Duo to the intelligence of FNProxy, synchronous interactions of Bidirectional Service (Bi-S) between
FNProxies have more extensive effects. Bi-S is necessary: a fundamental methodology, tool, and idea to
analyse and develop FNQoS systems.
This document explains in detail the protocol mechanisms of FNProxy interactions from two
perspectives: 1) the basic FNQoS system (BFS) 2) synthetic FNQoS system (SFS).
This document stipulates that protocol mechanisms can be used for all networks for transmission
purposes, and also for generalized networks, such as the implementation of semantic network protocol
mechanisms. The development of various network technologies based on Artificial Intelligence Enabled
Networking (AIEN) is recommended.
This document stipulates that the purpose of interactions between FNProxies can be either transmission
interactions or content interactions.
The protocol mechanism specified in this document is applicable to ISO/IEC TR 29181-8 and
ISO/IEC 21558-2.
The International Organization for Standardization (ISO) and the International Electrotechnical
Commission (IEC) draw attention to the fact that it is claimed that compliance with this document may
involve the use of a patent.
ISO and IEC take no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured ISO and IEC that he/she is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this
respect, the statement of the holder of this patent right is registered with ISO and IEC. Information may
be obtained from the patent database available at www.iso.org/patents or https://patents.iec.ch.
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights other than those in the patent database. ISO and IEC shall not be held responsible for
identifying any or all such patent rights.
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© ISO/IEC 2023 – All rights reserved

INTERNATIONAL STANDARD ISO/IEC 21559-2:2023(E)
Telecommunications and information exchange between
systems — Future network protocols and mechanisms —
Part 2:
Proxy model-based quality of service
1 Scope
The concept of this document considers the FNQoS related to the FNProxy based in ISO/IEC TR 29181-8.
The protocol mechanism given in this document supports both the interaction between two FNProxies
of a basic FNQoS system (BFS) and the interaction among multiple FNProxies in a synthetic FNQoS
system (SFS).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (
...