ISO 22741-1:2022 高度道路交通システム—ロードサイドモジュールAP-DATEXデータインターフェース—パート1：概要 | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

A list of all parts in the ISO 22741 series series can be found on the ISO website.

Introduction

0.1 Background

The need for standardized communication with field devices is growing around the world. Several countries have already adopted application profile data exchange (AP-DATEX)-based field device communication standards.

There is a growing opinion, supported by empirical evidence, that standardizing this activity will result in improved intelligent transport service (ITS) performance, reduced cost, reduced deployment time and improved maintainability. The ISO 22741 series extends ISO 15784-3 by defining the management information necessary to monitor, configure and control features of field devices. The data elements defined in all parts of the ISO 22741 series may be used with any protocol, but were designed with an expectation that they would be used with one of the ISO 15784-3 protocols.

By using the approach described in this document, agencies can specify open procurements and systems can be expanded geographically in an open and non-proprietary manner, which reduces the costs, speeds and deployment, and simplifies the integration.

0.2 Overview

The AP-DATEX specified in ISO 15784-3, the International Standard for communication between traffic management centres and field devices for traffic management, is suitable for use in the following cases:

• a) Intelligent field devices with advanced functions communicate with the centre system each in equal relation.
• b) The exchanged data have a large size and relatively fixed structure.
• c) The deterministic real time feature is not required but the efficient data exchange is required.
• d) Field devices communicate with not only the centre system but also other field devices simultaneously.

This document defines management information for field devices following the AP-DATEX conventions.

0.3 Document approach and layout

This document defines:

• a) terminology and symbols used throughout the various parts of the ISO 22741 series (Clauses 3 and 4);
• b) how conformance is defined in subsequent parts of the ISO 22741 series (Clause 5);
• c) conventions used throughout the various parts of the ISO 22741 series (Clause 6);
• d) the ITS architectural services defined in ISO 14813-1 that are addressed by the ISO 22741 series (Clause 7);
• e) the rules used by other parts of the ISO 22741 series in defining the user needs that drive the definition of requirements (Clause 8);
• f) the rules used by other parts of the ISO 22741 series in defining requirements and constraints (Clause 9);
• g) a set of generic dialogues that are referenced by other parts of the ISO 22741 series (Clause 10);
• h) a discussion of security that applies to all devices conforming to the ISO 22741 series (Clause 11);
• i) the data packet structures for the features defined by this document (Annex A).

0.4 Applicable environment

As depicted in Figure 1, all parts of the ISO 22741 series are intended to address data exchanges between:

• 1) a management centre (traffic or otherwise) and a field device (roadside module), or
• 2) two field devices.

Subsequent parts of the ISO 22741 series define needs, requirements and design details for various field device capabilities.

1 Scope

Field devices are a key component in intelligent transport systems (ITS). Field devices include traffic signals, message signs, weather stations, traffic sensors, roadside equipment for connected ITS (C-ITS) environments, etc.

Field devices often need to exchange information with other external entities. Field devices can be quite complex, necessitating the standardization of many data concepts for exchange. As such, the ISO 22741 series is divided into several individual Parts. This document (Part 1) introduces the ISO 22741 series and provides normative content that applies to the rest of the series.

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 (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

Bibliography