ISO 22418:2020 高度道路交通システム— ITSの一般的な目的のための高速サービスアナウンスプロトコル（FSAP） | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 278, Intelligent transport systems,in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 22418:2018), which has been technically revised. The main changes compared to the previous edition are as follows:

• this document has been editorially aligned with draft ETSI EN 302 890-1 in order to make these two standards complement each other such that both can be published as European standards;
• one minor technical detail of the ASN.1 code related to a specific extension element was harmonized with ETSI.

Introduction

Provisioning of ITS services at specific locations on the road network requires awareness of the availability and the purpose of such services in order to allow a road network user to make decisions on the potential consumption of such a service. Awareness of services can be achieved by pull and push mechanisms. Whilst pull mechanisms are well understood and deployed for non-time-critical usage, several use cases depend on a push mechanism. Whilst pull mechanisms require a-priori knowledge of an intended service, push mechanisms support also"mandatory services" that may be locally and dynamically applicable and defined by local policies rather than global regulations.

This document illustrates and specifies the features of the cooperative push mechanism"service announcement" based on the internationally harmonized message formats specified in ISO/TS 16460, and builds on any localized ITS-S communications protocol stack (ITS-SCPS), one of which is FNTP, specified in ISO 29281-1, which builds on the ITS-M5 access technology specified in ISO 21215. It is to be noted that the terms"service announcement" and"service advertisement" are used synonymously.

This document complements service announcement specifications at IEEE ("WAVE Service Advertisement" [WSA] specified in IEEE 1609.3[TM])and at ETSI ("Service Announcement Essential Message" [SAEM] specified in draft ETSI EN 302 890-1):

• The WSA requires normatively only a subset of the functionality specified in ISO/TS 16460. WAVE is designed for the IEEE 802.11(TM) OCB localized communications access technology operated in the 5,9 GHz frequency bands allocated in the United States of America, also referred to as"US-DSRC".
• The SAEM, also using the message formats specified in ISO/TS 16460, is tailored in support of a limited ITS service domain identified in ETSI as"Basic Set of Applications", using only a small sub-set of functionality specified in ISO/TS 16460 and in this document. So far, ETSI requires usage of the ITS-S communication protocol stack constituted by ITS-G5, GeoNetworking, the Basic Transport Protocol and the common ETSI message header.

Using the same ITS-SCPS for transmission of the service announcement message (SAM) and the same limited subset of service announcement functionality, FSAP, WSA, and SAEM are binary compatible with respect to the shared service announcement features.

Understanding service advertisement and the related protocol specified in this document requires understanding of ISO/TS 16460.

Requirements are specified in the following clauses of this document.

• Clause 5 specifies general requirements.
• Clause 6 presents a tutorial on architectural issues related to FSAP.
• Clause 7 specifies protocol elements of FSAP.
• Clause 8 specifies protocol procedures of FSAP.
• Clause 10 specifies conformance declaration.
• Clause 11 specifies test methods.
• Annex A specifies the ASN.1 module for FSAP.
• Annex B specifies details of the optional support of presenting communication requirements of FSAP to the ITS station management in conformance with ISO 17423.
• Annex C specifies details of the optional support of path and flow management for FSAP in conformance with ISO 24102-6.
• Annex D presents the implementation conformance statement proforma.

1 Scope

This document specifies the fast service announcement protocol (FSAP) for general purposes in ITS. It references and supports all features of ISO/TS 16460, especially supporting the service response message (SRM) and related features in addition to the service announcement message (SAM), which enables only very basic features.

FSAP supports locally advertised ITS services uniquely identified by an ITS application identifier (ITS-AID).

This document specifies message formats and related basic protocol procedures by reference to ISO/TS 16460, and further related protocol requirements for operation of FSAP in the context of an ITS station specified in ISO 21217.

This document illustrates its relations to service announcement protocols specified by ETSI TC ITS and IEEE.

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 terms and definitions given in ISO 21217 apply.

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

Bibliography