ISO/TR 17427-4:2015

TECHNICAL ISO/TR
REPORT 17427-4
First edition
2015-11-01
Intelligent transport systems —
Cooperative ITS —
Part 4:
Minimum system requirements and
behaviour for core systems
Systèmes intelligents de transport — Systèmes intelligents de
transport coopératifs —
Partie 4: Exigences minimales du système et comportement des
systèmes principaux
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Terms and definitions . 1
3 Abbreviated terms . 5
4 How to use this Technical Report . 7
4.1 Acknowledgements . 7
4.2 Guidance . 7
4.3 Stakeholders . 7
5 C-ITS and ‘minimum system requirements and behaviour for core systems’ .8
5.1 Overview . 8
5.2 Subsystem features of the ‘Core System’ .11
5.2.1 Core2Core subsystem .11
5.2.2 Data distribution subsystem .12
5.2.3 Misbehaviour management subsystem.13
5.2.4 Network services subsystem .13
5.2.5 System service monitor subsystem .13
5.2.6 Time synchronization subsystem .14
5.2.7 User permissions subsystem .14
5.2.8 User trust management subsystem .14
6 What are the key minimum system requirements and behaviour for core systems issues 15
6.1 Core system requirements .15
6.2 Core System subsystem functional requirements .19
6.2.1 Core to Core subsystem requirements .19
6.2.2 Data distribution subsystem requirements .23
6.2.3 Data provision request .24
6.2.4 Geo-casts .24
6.2.5 Field node configuration .24
6.2.6 Misbehaviour subsystem requirements .25
6.2.7 Networking services subsystem requirements .25
6.2.8 Network protocol .26
6.2.9 System service monitoring subsystem requirements.26
6.2.10 Time synchronization subsystem requirements .27
6.2.11 State/Mode/Status requirements .28
6.2.12 External interface requirements .28
6.2.13 User permission subsystem requirements .28
6.2.14 User trust management requirements .29
6.2.15 System performance subsystem requirements .31
6.2.16 System interface subsystem requirements .31
6.3 Core system - other requirements .31
6.3.1 Physical security .31
6.3.2 Environmental features .31
6.3.3 Backup power .32
6.3.4 Maintainability .32
6.3.5 Constraints .32
7 Internet-based communications standards .32
8 Internal interfaces .39
9 5,9 GHz security credential requirements .40
Bibliography .41
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
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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
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on the ISO list of patent declarations received (see www.iso.org/patents).
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For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 204, Intelligent transport systems.
ISO 17427 consists of the following parts, under the general title Intelligent transport systems —
Cooperative ITS:
— Part 2: Framework Overview [Technical Report]
— Part 3: Concept of operations (ConOps) for ‘core’ systems [Technical Report]
— Part 4: Minimum system requirements and behaviour for core systems [Technical Report]
— Part 6: ‘Core system’ risk assessment methodology [Technical Report]
— Part 7: Privacy aspects [Technical Report]
— Part 8: Liability aspects [Technical Report]
— Part 9: Compliance and enforcement aspects [Technical Report]
— Part 10: Driver distraction and information display [Technical Report]
The following parts are under preparation:
— Part 1: Roles and responsibilities in the context of co-operative ITS architecture(s)
— Part 5: Common approaches to security [Technical Report]
— Part 11: Compliance and enforcement aspects [Technical Report]
— Part 12: Release processes [Technical Report]
— Part 13: Use case test cases [Technical Report]
— Part 14: Maintenance requirements and processes [Technical Report]
iv © ISO 2015 – All rights reserved

This Technical Report provides an informative ‘minimum system requirements and behaviour for
core systems’ for Cooperative Intelligent Transport Systems (C-ITS). It is intended to be used alongside
ISO 17427-1, ISO/TR 17465-1 and other parts of ISO 17465, and ISO 21217. Detailed specifications for
the application context will be provided by other ISO, CEN and SAE deliverables, and communications
specifications will be provided by ISO, IEEE and ETSI.
Introduction
Intelligent transport systems (ITS) are transport systems in which advanced information, communication,
sensor and control technologies, including the Internet, are applied to increase safety, sustainability,
efficiency, and comfort.
A distinguishing feature of ‘ITS’ is its communication with outside entities.
Some ITS systems operate autonomously, for example, ‘adaptive cruise control’ uses radar/lidar and/or
video to characterize the behaviour of the vehicle in front and adjust its vehicle speed accordingly. Some
ITS systems are informative, for example, ‘variable message signs’ at the roadside or transmitted into
the vehicle, provide information and advice to the driver. Some ITS systems are semi-autonomous in
that they are largely autonomous but rely on ‘static’ or ‘broadcast’ data, for example, GNSS (2.22) based
‘SatNav’ systems operate autonomously within a vehicle but are dependent on receiving data broadcast
from satellites in order to calculate the location of the vehicle.
Cooperative Intelligent transport systems (C-ITS) are a group of ITS technologies where service provision
is enabled by, or enhanced by, the use of ‘live’, present situation related, dynamic data/information from
other entities of similar functionality [for example, from one vehicle to other vehicle(s)], and/or between
different elements of the transport network, including vehicles and infrastructure [for example,
from the vehicle to an infrastructure managed system or from an infrastructure managed system to
vehicle(s)]. Effec
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