Intelligent transport systems - Fast service announcement protocol (FSAP) for general purposes in ITS (ISO 22418:2020)

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.

Intelligente Verkehrssysteme - Protokoll zur schnellen Bekanntgabe von Diensten (FSAP) (ISO 22418:2020)

Systèmes de transport intelligents - Protocole d’annonce de service rapide (FSAP) (ISO 22418:2020)

Inteligentni transportni sistemi - Protokol objave hitre storitve (FSAP) za splošne namene v ITS (ISO 22418:2020)

General Information

Status
Published
Public Enquiry End Date
20-Oct-2019
Publication Date
28-Jul-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
18-Jun-2020
Due Date
23-Aug-2020
Completion Date
29-Jul-2020

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SLOVENSKI STANDARD
SIST EN ISO 22418:2020
01-september-2020

Inteligentni transportni sistemi - Protokol objave hitre storitve (FSAP) za splošne

namene v ITS (ISO 22418:2020)

Intelligent transport systems - Fast service announcement protocol (FSAP) for general

purposes in ITS (ISO 22418:2020)
Intelligente Verkehrssysteme - Protokoll zur schnellen Bekanntgabe von Diensten
(FSAP) (ISO 22418:2020)

Systèmes de transport intelligents - Protocole d’annonce de service rapide (FSAP) (ISO

22418:2020)
Ta slovenski standard je istoveten z: EN ISO 22418:2020
ICS:
03.220.01 Transport na splošno Transport in general
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
SIST EN ISO 22418:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 22418:2020
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SIST EN ISO 22418:2020
EN ISO 22418
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2020
EUROPÄISCHE NORM
ICS 03.220.01; 35.240.60
English Version
Intelligent transport systems - Fast service announcement
protocol (FSAP) for general purposes in ITS (ISO
22418:2020)

Systèmes de transport intelligents - Protocole Intelligente Verkehrssysteme - Protokoll zur schnellen

d'annonce de service rapide (FSAP) (ISO 22418:2020) Bekanntgabe von Diensten (FSAP) (ISO 22418:2020)

This European Standard was approved by CEN on 1 March 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22418:2020 E

worldwide for CEN national Members.
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SIST EN ISO 22418:2020
EN ISO 22418:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 22418:2020
EN ISO 22418:2020 (E)
European foreword

This document (EN ISO 22418:2020) has been prepared by Technical Committee ISO/TC 204

"Intelligent transport systems" in collaboration with Technical Committee CEN/TC 278 “Intelligent

transport systems” the secretariat of which is held by NEN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by December 2020, and conflicting national standards

shall be withdrawn at the latest by December 2020.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 22418:2020 has been approved by CEN as EN ISO 22418:2020 without any modification.

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SIST EN ISO 22418:2020
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SIST EN ISO 22418:2020
INTERNATIONAL ISO
STANDARD 22418
Second edition
2020-05
Intelligent transport systems — Fast
service announcement protocol
(FSAP) for general purposes in ITS
Systèmes de transport intelligents — Protocole d’annonce de service
rapide (FSAP)
Reference number
ISO 22418:2020(E)
ISO 2020
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SIST EN ISO 22418:2020
ISO 22418:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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SIST EN ISO 22418:2020
ISO 22418:2020(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Abbreviated terms .............................................................................................................................................................................................. 2

5 General requirements ..................................................................................................................................................................................... 2

6 Architecture ............................................................................................................................................................................................................... 4

6.1 ITS communications architecture .......................................................................................................................................... 4

6.2 Implementation architecture ..................................................................................................................................................... 4

6.3 Communication roles and entities ......................................................................................................................................... 4

6.4 Communication phases ................................................................................................................................................................... 5

6.4.1 Overview ................................................................................................................................................................................. 5

6.4.2 Service initialization phase ..................................................................................................................................... 5

6.4.3 Service operation phase ............................................................................................................................................ 8

6.5 Advertised services ............................................................................................................................................................................. 8

6.6 FSAP reference architecture ........................................................................................................................................................ 9

7 Protocol elements ............................................................................................................................................................................................10

7.1 Management service access points ....................................................................................................................................10

7.2 Protocol data units ............................................................................................................................................................................10

7.2.1 General...................................................................................................................................................................................10

7.2.2 Fast service advertisement message (FSAM) .......................................................................................11

7.2.3 Fast service response message (FSRM) ....................................................................................................11

7.2.4 Secured messages ........................................................................................................................................................11

7.2.5 Request and response messages .....................................................................................................................12

7.3 Port numbers .........................................................................................................................................................................................12

7.4 ITS application object identifier (ITS-AID) ..................................................................................................................12

8 Protocol procedures ......................................................................................................................................................................................12

8.1 General ........................................................................................................................................................................................................12

8.1.1 FSAP communication handler procedures .............................................................................................12

8.1.2 FSAP manager procedures ...................................................................................................................................13

8.1.3 Extension elements ....................................................................................................................................................13

8.2 Service provider ..................................................................................................................................................................................14

8.2.1 FSAP registration ..........................................................................................................................................................14

8.2.2 FSAP registration update .......................................................................................................................................16

8.2.3 FSAP deregistration ........................................................................................................................................... .........17

8.2.4 FSAP communication management..............................................................................................................18

8.2.5 Transmission of FSAM .................. ......................................................................................................................... ...22

8.2.6 Reception of FSRM ......................................................................................................................................................22

8.3 Service user .............................................................................................................................................................................................25

8.3.1 FSAP registration ..........................................................................................................................................................25

8.3.2 FSAP registration update .......................................................................................................................................26

8.3.3 FSAP deregistration ........................................................................................................................................... .........26

8.3.4 Reception of FSAM ......................................................................................................................................................27

8.4 Service operation phase ...............................................................................................................................................................31

8.5 ITS station-internal management communications ............................................................................................32

8.6 Duplicate service detection .......................................................................................................................................................32

8.7 System service ......................................................................................................................................................................................32

8.7.1 General...................................................................................................................................................................................32

8.7.2 Mandatory applications ..........................................................................................................................................32

9 Optionally supported features ............................................................................................................................................................33

© ISO 2020 – All rights reserved iii
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SIST EN ISO 22418:2020
ISO 22418:2020(E)

10 Conformance ..........................................................................................................................................................................................................33

11 Test methods ..........................................................................................................................................................................................................33

Annex A (normative) ASN.1 modules ................................................................................................................................................................34

Annex B (normative) Support of application requirements for communications.............................................41

Annex C (normative) Support of path and flow management .................................................................................................43

Annex D (normative) Implementation conformance statement ..........................................................................................44

Bibliography .............................................................................................................................................................................................................................55

iv © ISO 2020 – All rights reserved
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SIST EN ISO 22418:2020
ISO 22418:2020(E)
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

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

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, 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.

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.
© ISO 2020 – All rights reserved v
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SIST EN ISO 22418:2020
ISO 22418:2020(E)
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.
vi © ISO 2020 – All rights reserved
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SIST EN ISO 22418:2020
INTERNATIONAL STANDARD ISO 22418:2020(E)
Intelligent transport systems — Fast service
announcement protocol (FSAP) for general purposes in ITS
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.

ISO/IEC 8825-2, Information technology — ASN.1 encoding rules: Specification of Packed Encoding Rules

(PER) — Part 2

ISO/IEC 8825-7, Information technology — ASN.1 encoding rules — Part 7: Specification of Octet Encoding

Rules (OER)

ISO/TS 16460, Intelligent transport systems — Communications access for land mobiles (CALM) —

Communication protocol messages for global usage

ISO 17419, Intelligent transport systems — Cooperative systems — Globally unique identification

ISO 17423, Intelligent transport systems — Cooperative systems — Application requirements and objectives

ISO 21217, Intelligent transport systems — Communications access for land mobiles (CALM) — Architecture

ISO 29281-1, Intelligent transport systems — Localized communications — Part 1: Fast networking &

transport layer protocol (FNTP)

ISO 24102-3, Intelligent transport systems — ITS station management — Part 3: Service access points

ISO 24102-4, Intelligent transport systems — ITS station management — Part 4: Station-internal

management communications

ISO 24102-6, Intelligent transport systems — Communications access for land mobiles (CALM) — ITS

station management — Part 6: Path and flow management
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 21217 apply.

© ISO 2020 – All rights reserved 1
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SIST EN ISO 22418:2020
ISO 22418:2020(E)

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Abbreviated terms
APDU application protocol data unit
FSAM fast service advertisement message
FSAP fast service announcement protocol
FSRM fast service response message
ITS-AID ITS application identifier
ITS-SAPID ITS-S application process identifier
ITS-SCPS ITS station communication protocol stack
REQN request message PDU, no response message PDU expected
REQW request message PDU, response message PDU expected
RES response message PDU, acknowledging a REQW
SAEM service announcement essential message
SAM service announcement message
SRM service response message
S-FSAM secured FSAM
S-FSRM secured FSRM
SrvIniP service initialization phase
SrvOpP service operation phase
5 General requirements

The normative part of the specification of the service advertisement messages in ISO/TS 16460 is a

normative part of this document.

The FSAP specified in this document shall be identified in FSAP APDUs by the version number three.

APDUs specified in this document are the FSAM and the FSRM.

The messages for FSAM and FSRM shall be encapsulated by a security frame, resulting in a S-FSAM and

a S-FSRM.

Fragmented transmission of FSRMs and FSAMs is prohibited. Thus, the maximum size of S-FSAMs and

S-FSRMs is limited by the capabilities of the protocol stack used for transmission.

FSAP is identified at the ITS-S networking and transport layer by:

— the well-known registered ITS port number (ITS-PN) PORT_SAM = 1 = 0x00.01, identifying the FSAP

port that is receiving groupcasted S-FSAMs, and
2 © ISO 2020 – All rights reserved
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SIST EN ISO 22418:2020
ISO 22418:2020(E)
— dynamically assigned ITS-PNs:

— PORT_DYN_FSAM identifying the FSAP port that is receiving unicast S-FSAMs. The dynamic

assignment is done in the ITS-SU that is transmitting S-FSRMs;

— PORT_DYN_FSRM identifying the FSAP port that is receiving unicast S-FSRMs. The dynamic

assignment is done in the ITS-SU that is transmitting S-FSAMs;
as illustrated in Table 1; see also 7.3 on ITS port numbers.
Table 1 — FSAP ITS port numbers
Direction Source ITS-PN Destination ITS-PN MAC mode
From service PORT_DYN_FSRM PORT_SAM Groupcast
advertiser to (broadcast or multicast)
service user
PORT_DYN_FSAM Unicast
From service user PORT_SAM PORT_DYN_FSRM
to service
PORT_DYN_FSAM
advertiser

NOTE Procedures on how to perform multicast transmission of S-FSAMs are not specified in this document.

Unicast transmissions of S-FSRMs and S-FSAMs may be repeated, e.g. after timeout for a respective

acknowledgement, as defined by implementation.
Further on the FSAP is identified by:

— the ITS-AID 2.113.664; see also 7.4. The p-encoded (ASN.1 unaligned packed encoding rules)

presentation of this number of ASN.1 type ITSaid specified in ISO 17419 is 0pE0.00.00.00, i.e. fits

into a four octet field.

An implementation supporting path and flow management shall conform to ISO 24102-6.

An implementation for a distributed ITS-SU, i.e. an ITS-SU consisting of several ITS-SCUs interconnected

with an ITS station-internal network, shall conform to ISO 24102-4.

— identical message formats for service advertisement are used in IEEE 1609.3(TM) (WAVE SAM) and

ETSI TS 102 890 (SAEM), and
— the features specifications in IEEE 1609.3(TM) and ETSI TS 102 89
...

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