ISO 17438-5:2025
(Main)Intelligent transport systems — Indoor navigation for personal and vehicle ITS stations — Part 5: Requirements and message specification for central ITS station (C-ITS-S) based positioning
Intelligent transport systems — Indoor navigation for personal and vehicle ITS stations — Part 5: Requirements and message specification for central ITS station (C-ITS-S) based positioning
This document defines detailed use cases, requirements and message specifications for supporting central ITS station based indoor positioning to provide indoor navigation functionality between a personal/vehicle (P/V) ITS station and the central ITS station. This document is only applicable to the core flow for the central ITS station based indoor positioning. The following issues which are adjunctive but essential for commercial navigation services are beyond the scope of this document: — authorized and authenticated access of users and services, including security; — payment; — preparation of indoor data which are necessary for indoor navigation; — low-level communication protocols required to transfer and share data from and to a roadside ITS station or a central ITS station; — other issues dependent on implementation of an instance of indoor navigation.
Systèmes de transport intelligents — Navigation intérieure pour les stations ITS personnelles et de véhicules — Partie 5: Exigences et spécification de message pour le positionnement basé sur la station ITS centrale (C-ITS-S)
General Information
Standards Content (Sample)
International
Standard
ISO 17438-5
First edition
Intelligent transport systems —
2025-09
Indoor navigation for personal and
vehicle ITS stations —
Part 5:
Requirements and message
specification for central ITS station
(C-ITS-S) based positioning
Systèmes de transport intelligents — Navigation intérieure pour
les stations ITS personnelles et de véhicules —
Partie 5: Exigences et spécification de message pour le
positionnement basé sur la station ITS centrale (C-ITS-S)
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 1
3.1 Terms and definitions .1
3.2 Abbreviated terms .2
4 Requirements and conformance . . 3
4.1 Requirements .3
4.2 Conformance .3
5 Conventions . 3
6 Central ITS Station (C-ITS-S) based positioning . 3
6.1 Overview .3
6.2 Use case definition .4
6.3 Message flow .4
6.4 Message definition .5
6.4.1 General .5
6.4.2 get-positions .5
6.4.3 candidate-positions .6
Annex A (normative) Data type . 7
Annex B (normative) ASN.1 module . 17
Bibliography .21
iii
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
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
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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.
A list of all parts in the ISO 17438 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.
iv
Introduction
With the spread of nomadic and mobile devices such as smart phones and the rapid expansion of indoor
spaces, many of the services and facilities related to the transport system have become accessible to
indoor spaces. Consequently, navigation in indoor space is considered an increasingly critical functionality
for variety of applications, including indoor navigation for vehicles and public-area mobile robots in the
transport industry.
The ISO 17438 series are intended to be used by designers, developers and providers of indoor navigation
services. The ISO 17438 series define requirements, data model, and encoding format of indoor positioning
reference data for supporting indoor navigation in intelligent transport systems. When implemented, this
document will:
a) provide developers and designers with concepts and appropriate information to implement the central
ITS station (C-ITS-S) based positioning
b) provide developers and designers with interoperable ways to use the central ITS station (C-ITS-S) based
positioning for indoor navigation;
c) enable users to be provided with indoor navigation;
d) provide developers and designers with an extendable base for indoor navigation.
The objective of this document is to define requirements and message specification for central ITS station
(C-ITS-S) based positioning required for indoor navigation functionality for ITS applications, as a part of the
ISO 17438 series.
v
International Standard ISO 17438-5:2025(en)
Intelligent transport systems — Indoor navigation for
personal and vehicle ITS stations —
Part 5:
Requirements and message specification for central ITS
station (C-ITS-S) based positioning
1 Scope
This document defines detailed use cases, requirements and message specifications for supporting central
ITS station based indoor positioning to provide indoor navigation functionality between a personal/vehicle
(P/V) ITS station and the central ITS station.
This document is only applicable to the core flow for the central ITS station based indoor positioning. The
following issues which are adjunctive but essential for commercial navigation services are beyond the scope
of this document:
— authorized and authenticated access of users and services, including security;
— payment;
— preparation of indoor data which are necessary for indoor navigation;
— low-level communication protocols required to transfer and share data from and to a roadside ITS station
or a central ITS station;
— other issues dependent on implementation of an instance of indoor navigation.
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 13184-2, Intelligent transport systems (ITS) — Guidance protocol via personal ITS station for advisory
safety systems — Part 2: Road guidance protocol (RGP) requirements and specification
ISO 17438-1, Intelligent transport systems — Indoor navigation for personal and vehicle ITS station — Part 1:
General information and use case definition
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 13184-2, ISO 17438-1 and the
following apply.
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 https:// www .electropedia .org/
3.1.1
server-based indoor positioning
indoor positioning executed at a central ITS station (C-ITS-S)
[SOURCE: ISO 17438-4:2019, 3.1.9]
3.1.2
indoor positioning infrastructure
infrastructure used to determine locations of personal/vehicle ITS stations (P/V-ITS-S) in an indoor space
EXAMPLE Wi-Fi, Bluetooth, etc.
[SOURCE: ISO 17438-4:2019, 3.1.11]
3.1.3
indoor positioning reference
information to support indoor positioning
Note 1 to entry: Detailed specifications and contents of indoor positioning references depend on the specific indoor
positioning technologies.
EXAMPLE 1 A good example of an indoor positioning reference is information about indoor positioning
infrastructure.
EXAMPLE 2 For Wi-Fi based positioning, the indoor positioning infrastructure information includes the Wi-Fi APs
information, such as location, SSID, and RSSI values of APs.
[SOURCE: ISO 17438-4:2019, 3.1.12]
3.2 Abbreviated terms
AP Access Point
ASN Abstract Syntax Notation
BLE Bluetooth Low Energy
BS Base Station
ITS Intelligent Transport Systems
ITS-S ITS Station
P/V-ITS-S Personal/Vehicle ITS Station
C-ITS-S Central ITS Station
CID Cell IDentifier
LTE Long Term Evolution
M/O Mandatory/Optional
MCC Mobile Country Code
MNC Mobile Network Code
MO Maximum Occurrence
PCI Physical Cell Identifier
RSSI Received Signal Strength Indicator
SSID Service Set IDentifier
UUID Universally Unique IDentifier
4 Requirements and conformance
4.1 Requirements
This document defines use cases and message interfaces between a P/V-ITS-S and a C-ITS-S for supporting
server-based positioning in indoor navigation functionality.
In the definitions of messages and data types, there are mandatory, optional or conditional fields. Mandatory
fields shall be provided, and conditions for conditional fields shall be satisfied. These are the requirements
embedded in the definition of messages for supporting server-based positioning.
Specific encoding of each message and data types can be adapted for implementation. There may be
additional requirements for specific encoding.
4.2 Conformance
For the purpose of conformance to the server-base
...
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