ISO 21217:2020
(Main)Intelligent transport systems — Station and communication architecture
Intelligent transport systems — Station and communication architecture
This document describes the communications reference architecture of nodes called "ITS station units" designed for deployment in intelligent transport systems (ITS) communication networks. The ITS station reference architecture is described in an abstract manner. While this document describes a number of ITS station elements, whether or not a particular element is implemented in an ITS station unit depends on the specific communication requirements of the implementation. This document also describes the various communication modes for peer-to-peer communications over various networks between ITS communication nodes. These nodes can be ITS station units as described in this document or any other reachable nodes. This document specifies the minimum set of normative requirements for a physical instantiation of the ITS station based on the principles of a bounded secured managed domain.
Systèmes de transport intelligents — Architecture de la station et de la communication
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INTERNATIONAL ISO
STANDARD 21217
Third edition
2020-12
Intelligent transport systems —
Station and communication
architecture
Systèmes de transport intelligents — Architecture du station et du
communication
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 7
5 Requirements .10
6 Overview of ITS communications .10
6.1 ITS services and applications .10
6.2 ITS communication technologies .11
6.3 ITS communication characteristics .12
6.4 Localized and networked communications .13
6.5 Hybrid communications .13
6.6 ITS communication networks .13
6.7 ITS station interconnection scenarios .14
6.8 Communication paths and data flows .16
7 ITS station — overview .17
7.1 ITS station — concept .17
7.2 ITS station architecture .18
7.2.1 Generalized OSI model . .18
7.2.2 ITS station nodes .21
7.2.3 Protocol and service data units in the ITS-S protocol stack .22
7.2.4 Distributed implementations of ITS-S roles .23
8 Details of elements of ITS-S reference architecture.25
8.1 ITS-S interfaces .25
8.1.1 Implementation habits .25
8.1.2 ITS-S management interfaces .25
8.1.3 ITS-S security interfaces .26
8.1.4 ITS-S communications interfaces .26
8.1.5 ITS-S application programming interface .26
8.2 ITS-S access layer .26
8.2.1 Access technologies .26
8.2.2 Details of the ITS-S access layer .27
8.2.3 Logical channels .28
8.2.4 Prioritization of transmission requests .29
8.3 ITS-S networking and transport layer .30
8.3.1 ITS-S networking and transport layer details .30
8.3.2 Networking protocols .31
8.3.3 Transport protocols .31
8.4 ITS-S facilities layer .32
8.4.1 ITS-S facilities layer details .32
8.4.2 ITS-S facilities services .33
8.5 ITS-S management entity .34
8.5.1 Management entity details .34
8.5.2 Management functionality .36
8.6 ITS-S security entity .36
8.6.1 Security entity details .36
8.6.2 Functionality .38
8.7 ITS-S applications .38
8.7.1 ITS-S applications details .38
8.7.2 ITS service .40
9 Typical implementations of ITS-SUs .41
Annex A (informative) Illustration of typical ITS-SU implementations .42
Annex B (informative) ITS-S configurations .46
Bibliography .50
iv © ISO 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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 ISO documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO 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).
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.
This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
This third edition cancels and replaces the second edition (ISO 21217:2014), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— many general alignments with other standards (e.g. on terms and abbreviations, and on references)
revised or developed since the publication of the second edition of this document;
— prioritization in the receive path added;
— more details on hybrid communications included;
— details on security requirements added.
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.
Introduction
This document provides the intelligent transport systems (ITS) station and communication reference
architecture that is referenced in a family of deliverables from standard development organizations
(SDOs) for cooperative intelligent transport systems (C-ITS), which is a subset of standards for ITS.
ITS aims to improve surface transportation in terms of:
— safety
e.g. crash avoidance, obstacle detection, emergency calls, dangerous goods;
— efficiency
e.g. navigation, green wave, priority, lane access control, contextual speed limits, car sharing;
— comfort
e.g. telematics, parking, electric vehicle charging, infotainment; and
— sustainability,
by applying information and communication technologies (ICT).
ITS specifications are in general developed to address a specific ITS service domain (see ISO 14813-1),
such as public transport, road safety, freight and logistics, public emergencies or
...
INTERNATIONAL ISO
STANDARD 21217
Third edition
2020-12
Intelligent transport systems —
Station and communication
architecture
Systèmes de transport intelligents — Architecture du station et du
communication
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 7
5 Requirements .10
6 Overview of ITS communications .10
6.1 ITS services and applications .10
6.2 ITS communication technologies .11
6.3 ITS communication characteristics .12
6.4 Localized and networked communications .13
6.5 Hybrid communications .13
6.6 ITS communication networks .13
6.7 ITS station interconnection scenarios .14
6.8 Communication paths and data flows .16
7 ITS station — overview .17
7.1 ITS station — concept .17
7.2 ITS station architecture .18
7.2.1 Generalized OSI model . .18
7.2.2 ITS station nodes .21
7.2.3 Protocol and service data units in the ITS-S protocol stack .22
7.2.4 Distributed implementations of ITS-S roles .23
8 Details of elements of ITS-S reference architecture.25
8.1 ITS-S interfaces .25
8.1.1 Implementation habits .25
8.1.2 ITS-S management interfaces .25
8.1.3 ITS-S security interfaces .26
8.1.4 ITS-S communications interfaces .26
8.1.5 ITS-S application programming interface .26
8.2 ITS-S access layer .26
8.2.1 Access technologies .26
8.2.2 Details of the ITS-S access layer .27
8.2.3 Logical channels .28
8.2.4 Prioritization of transmission requests .29
8.3 ITS-S networking and transport layer .30
8.3.1 ITS-S networking and transport layer details .30
8.3.2 Networking protocols .31
8.3.3 Transport protocols .31
8.4 ITS-S facilities layer .32
8.4.1 ITS-S facilities layer details .32
8.4.2 ITS-S facilities services .33
8.5 ITS-S management entity .34
8.5.1 Management entity details .34
8.5.2 Management functionality .36
8.6 ITS-S security entity .36
8.6.1 Security entity details .36
8.6.2 Functionality .38
8.7 ITS-S applications .38
8.7.1 ITS-S applications details .38
8.7.2 ITS service .40
9 Typical implementations of ITS-SUs .41
Annex A (informative) Illustration of typical ITS-SU implementations .42
Annex B (informative) ITS-S configurations .46
Bibliography .50
iv © ISO 2020 – All rights reserved
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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 ISO documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO 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).
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.
This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
This third edition cancels and replaces the second edition (ISO 21217:2014), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— many general alignments with other standards (e.g. on terms and abbreviations, and on references)
revised or developed since the publication of the second edition of this document;
— prioritization in the receive path added;
— more details on hybrid communications included;
— details on security requirements added.
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.
Introduction
This document provides the intelligent transport systems (ITS) station and communication reference
architecture that is referenced in a family of deliverables from standard development organizations
(SDOs) for cooperative intelligent transport systems (C-ITS), which is a subset of standards for ITS.
ITS aims to improve surface transportation in terms of:
— safety
e.g. crash avoidance, obstacle detection, emergency calls, dangerous goods;
— efficiency
e.g. navigation, green wave, priority, lane access control, contextual speed limits, car sharing;
— comfort
e.g. telematics, parking, electric vehicle charging, infotainment; and
— sustainability,
by applying information and communication technologies (ICT).
ITS specifications are in general developed to address a specific ITS service domain (see ISO 14813-1),
such as public transport, road safety, freight and logistics, public emergencies or
...
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