ISO 17438-4:2019

Overview

ISO 17438-4:2019 - Intelligent transport systems - Indoor navigation for personal and vehicle ITS station - Part 4 - specifies the requirements, use cases and message specifications for indoor navigation interfaces between a personal/vehicle (P/V) ITS station and a central ITS station. The standard targets the core navigational flow inside indoor spaces (e.g., stations, terminals, parking structures) and defines clusters of use cases, detailed use cases and the XML/DXM-encoded messages needed to support them. It intentionally excludes adjunct commercial topics such as security/authentication, payment, preparation of indoor data and low-level transfer protocols.

Key topics and technical requirements

• Use case clusters and detailed flows: Organized processing flows for indoor navigation between P/V-ITS-S and C-ITS-S (identification of indoor space, indoor navigation data, client- and server-based navigation).
• Message specifications: A set of DXM/XML message definitions (e.g., search/retrieve messages for indoor POIs, indoor maps and indoor positioning references) with mandatory, conditional and optional elements and defined cardinalities.
• Conformance rules: Clause-based conformance requirements and obligations; elements in messages are classified as mandatory/conditional/optional for testing and implementation.
• Data encoding: Uses XML and Data eXchange Message (DXM) format as defined in ISO 13184-2 for message encoding.
• Terminology and data types: Definitions for indoor map types, indoor positioning references, indoor positioning infrastructures (Wi‑Fi, Bluetooth examples), ITS station roles (P/V-ITS-S, C-ITS-S, R-ITS-S).
• Scope control: Focus on core navigation flow; excludes detailed indoor data formats (addressed in ISO 17438-2/-3) and security/commerce concerns.

Practical applications

• Implementing interoperable indoor navigation services in transport hubs (airports, train stations), large public buildings, indoor parking and multi-level terminals.
• Enabling mobile and in-vehicle navigation apps to query and retrieve indoor maps, points of interest (POIs) and positioning references from a central ITS server.
• Providing a common message framework for system integrators, ITS vendors, mapping providers and application developers to exchange indoor navigation data.
• Facilitating both client-based and server-based indoor positioning workflows for real-time guidance and routing.

Who should use this standard

• ITS designers and system architects
• Mobile and in-vehicle application developers
• Indoor mapping and positioning technology providers
• Facility operators and transport authorities planning indoor navigation services
• System integrators implementing P/V ↔ central ITS station interfaces

Related standards

• ISO 17438-1 (general information/use case definition)
• ISO 17438-2 / ISO 17438-3 (detailed indoor data and positioning formats - under development)
• ISO 13184-2 (DXM/XML encoding guidance)
• ISO 17423, ISO/TS 17429 (related ITS application and facility references)

Keywords: ISO 17438-4:2019, indoor navigation, ITS, personal/vehicle ITS station, central ITS station, message specifications, DXM, XML, indoor maps, indoor positioning references.