ISO 14827-2:2022
(Main)Intelligent transport systems — Data interfaces between centres for transport information and control systems — Part 2: AP-DATEX
Intelligent transport systems — Data interfaces between centres for transport information and control systems — Part 2: AP-DATEX
This document defines a platform-specific model (PSM) for data exchange, which specifically uses ASN.1 and TCP/UDP (transmission control protocol/user datagram protocol) datagrams which were defined as “DATEX-ASN” in the first edition of this document for AP-DATEX (application profile-data exchange) and other Internet protocol (IP) networks. A PSM is an actual implementation of a platform-independent model (PIM) for exchange. This document specifies the message rules and procedures for communication between different systems for ITS using TCP/UDP datagrams. This document deals mainly with the communication interfaces. It has been designed to meet the unique requirements of intelligent transport systems (ITS). However, it has also been designed in a generic fashion and thus can be used for other data exchanges as well.
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INTERNATIONAL ISO
STANDARD 14827-2
Second edition
2022-12
Intelligent transport systems —
Data interfaces between centres for
transport information and control
systems —
Part 2:
AP-DATEX
Reference number
© ISO 2022
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Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.2
5 Conformance . 3
6 Exchange framework.3
6.1 General . 3
6.2 Basic pull with TCP/UDP datagrams exchange PSM . 5
6.2.1 Overview . 5
6.2.2 Exchange pattern messages definition . 6
6.2.3 State diagrams. 7
6.2.4 Features implementation description . 7
6.3 Basic push TCP/UDP datagrams exchange PSM . 8
6.3.1 Overview . 8
6.3.2 Exchange pattern messages definition . 9
6.3.3 State diagrams. 9
6.3.4 Features implementation description . 10
7 Data exchange procedures .11
7.1 General . 11
7.2 General datagrams procedures . 11
7.2.1 General . 11
7.2.2 Sessions . 11
7.2.3 Transport requirements .12
7.2.4 Response time-outs .12
7.2.5 Retransmission .12
7.2.6 Duplicate datagrams .12
7.3 General file procedures. 12
7.4 Sessions .12
7.4.1 General .12
7.4.2 Establishing a session .13
7.4.3 Maintaining a session . . 14
7.4.4 Terminating a session .15
7.5 Requesting information . 16
7.5.1 General . 16
7.5.2 Offline subscriptions . 16
7.5.3 Online subscriptions . 16
7.6 Publication of information . 17
7.6.1 General . 17
7.6.2 General procedures . 17
7.6.3 Single subscriptions . 19
7.6.4 Registered subscriptions . 19
Annex A (normative) Message definition requirements .21
Annex B (normative) Datagram structures .25
Annex C (normative) Data dictionary .33
Annex D (normative) Value domains .64
Annex E (normative) TCP/UDP datagrams exchange implementation considerations .77
Annex F (normative) TCP/UDP datagrams exchange over internet protocols .78
iii
Annex G (normative) Protocol requirements list .79
Bibliography .83
iv
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
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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 second edition cancels and replaces the first edition (ISO 14827-2:2005), which has been technically
revised.
The main changes are as follows:
— the title has been modified;
— the concept of a platform-independent model (PIM) as defined in ISO/TS 19468 has been integrated;
— the message format previously defined in ISO 14827-1:2005 (to be withdrawn) has been included.
A list of all parts in the ISO 14827 series can be found on the ISO website.
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.
v
Introduction
Data exchange among centres is a baseline service for implementing intelligent transport system
(ITS) services. For interoperability purposes, data delivery and collaborative ITS services need to be
implemented according to certain specifications based on fully-described interfaces.
This document has been revised based on the concept of a platform-independent model (PIM) as
defined in ISO/TS 19468, maintaining backward compatibility with ISO 14827-2:2005 and taking into
consideration the future withdrawal of ISO 14827-1:2005.
The development of the first editions of ISO 14827-1 and ISO 14827-2 began in the 1990s. These
documents were published in 2005 based on European DATEX. Since then, the exchange environment
of traffic information and traffic data has made a great deal of progress and DATEX II has been
developed, enabling the distribution of traffic information and traffic management information
in a way that is not dependent on language and presentation format. DATEX II is closely related to
ISO/TS 19468. ISO/TS 19468 aims to describe the general exchange specification technology and to
describe interaction through a high-level model which is not dependent on a specific technology in a
model-driven approach; it defines functional exchange profiles by several possible exchange patterns.
According to this concept, ISO 14827-2 (this document) was revised as a platform-specifi
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