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Architecture (ISO TC 204 WG 1)

Domain of interest

The purpose of WG1 is to promote consistency across ISO/TC 204 standards by encouraging adherence to a consistent ITS architecture (including consistent user services and data concepts) and documentation approach (including consistent technical approaches, documentation formats, and terminology) across working groups.

WG1 activities include:

News and highlights

Edition 2 of ISO/TS 14812 (ITS Vocabulary) is expected to be approved in 2025. The new version is expected to add over 70 new terms.

Vocabulary

ISO/TS 14812:2022 Intelligent transport systems — Vocabulary

Status: Approved (under revision)

Abstract: This document defines terms relating to intelligent transport systems (ITS).

Description

The definition of terms are available for free online via the preview function, ISO's online browsing platform, or the Geolexica website. The standard itself inlcudes an ennex that provides the complete concept model that graphically depicts the relationships among the terms defined in the standard.

Edition 2 is expected to add terms for:

  • information security terms (e.g., authentication)
  • concept realization terms (e.g., implementation)
  • device component terms (e.g., sensor)
  • additional alternate mode terms (e.g., shared-space)
  • additional road network terms (e.g., alley)
  • facility terms (e.g., bridge)
  • kerbside usage terms (e.g., loading area)
  • road equipment terms (e.g., traffic control device)
  • additional location terms (e.g., geographic feature)
  • jurisdictional terms (e.g., campus)
  • additional traveller terms (e.g., vulnerable road user)
  • additional vehicle attribute terms (e.g., vehicle fuel type)
  • financial terms (e.g., payment mode)

Reference ITS architecture

ISO 14813-1:2024 Intelligent transport systems — Reference model architecture(s) for the ITS sector — Part 1: ITS service domains, service groups and services

Status: Approved

Abstract: This document provides a description of the primary services that have been internationally defined to promote consistency among implementations. Implementations can provide any of these services in combination with any other services that are appropriate. This document organizes ITS services by defining service groups, which are placed into one of several service domains. Each service group contains one or more individual services, each of which is described.

Description

This document is intended for use by at least two groups of people involved in the ITS sector:

  • those who are looking for ideas about the services that ITS implementations can provide, and
  • those who are developing International Standards.

For the first group, this document provides service descriptions that can act as the catalyst for more detailed descriptions. The level of detail can differ from one ITS implementation to another, depending on whether or not a national ITS architecture is involved, and whether or not this architecture is based directly on services, or on groups of functions. The service descriptions in this document are pitched at a high-level as too much detail can be prescriptive and reduces flexibility.

For standards developers, this document is applicable to Technical Committees who are developing International Standards for the ITS sector. This document is designed to provide information and explanations of services that can form the basis and reason for developing standards.

Due to its nature, this document is largely advisory and informative with minimal requirements. It is designed to assist the integration of services into a cohesive reference architecture, thereby promoting interoperability and the use of common data definitions. Specifically, services defined within the service groups can be the basis for defining “use cases”, “user needs” or "user service requirements” depending on the methodology being used to develop the resultant ITS architecture functionality. They can also assist with defining applicable data within data dictionaries, and applicable communications and data exchange standards.

Documentation in TC 204 Standards

ISO 14813-5:2020 Intelligent transport systems — Reference model architecture(s) for the ITS sector — Part 5: Requirements for architecture description in ITS standards

Status: Approved

Abstract: This document defines documentation rules for standards that define interfaces between or among system elements of an ITS reference architecture. This includes:

  1. requirements for documenting aspects of the ITS reference architecture;
  2. terminology to be used when documenting or referencing aspects of the ITS reference architecture.
ISO 14813-6:2017 Intelligent transport systems — Reference model architecture(s) for the ITS sector — Part 6: Use of ASN.1

Status: Approved

Abstract: Provides a formal means to achieve consistency in the use of ASN.1 when specifying data types that are to be used in ITS International Standards. This is designed to ensure unambiguous and interoperable data exchange while providing consistent documentation of these exchanges. This document provides the necessary specifications to ensure consistent interpretation by providing formal references to several standards and in some cases specifying additional rules to promote greater consistency among standards.

Common Data Model

ISO 14817-1:2015 Intelligent transport systems — ITS central data dictionaries — Part 1: Requirements for ITS data definitions

Status: Approved

Abstract: This document specifies the logical structure (framework) and the data content (substance) of intelligent transport systems (ITS) data dictionaries (DDs).

Specifically, this part of ISO 14817 specifies the following:

  • framework used to identify and define all data concepts;
  • meta-attributes used to describe, standardize and manage each of the data concepts defined within this framework;
  • requirements used to record these definitions;
  • naming conventions for the data concepts;
  • a set of preferred data concepts within the ITS domain;
  • data modelling method for defining ITS data concepts, when used.
ISO 14817-2:2015 Intelligent transport systems — ITS central data dictionaries — Part 2: Governance of the Central ITS Data Concept Registry

Status: Approved

Abstract: ISO 14817-2:2015 specifies the registration process to enter data concepts into the Central ITS Data Concept Registry (CIDCR).

The CIDCR is designed to include data concepts that conform to ISO 14817-1. These data concepts may be derived from the system architecture defined in ISO 14813, but may also support data concepts using alternative International, Regional or National System Architecture methodologies or techniques.

ISO 14817-3:2017 Intelligent transport systems — ITS data dictionaries — Part 3: Object identifier assignments for ITS data concepts

Status: Approved

Abstract: ISO 14817-3:2017 specifies how to assign an object identifier to a data concept under the "its" arc of the international object identifier tree.

Application of Technologies

ISO/TR 23255 Intelligent transport systems — Architecture — Applicability of data distribution technologies within ITS

Status: Approved

Abstract: A variety of general-purpose data distribution technologies have emerged within the Information and Communications Technologies (ICT) industry. These technologies generally provide services at the Open System Interconnect (OSI) session, presentation and application layers (i.e. layers 5-7). Within Intelligent Transport Systems (ITS), these layers roughly correspond to the facilities layer of the ITS station (ITS-S) reference architecture, as defined within ISO 21217.

This document investigates the applicability of these data distribution technologies within the ITS environment.