Overview
CEN ISO/TS 21184:2021 - also published as ISO/TS 21184:2021 - defines a Global Transport Data Management (GTDM) framework for Cooperative Intelligent Transport Systems (C-ITS). The specification standardizes how transport-related data is modeled, managed and exchanged between applications and ITS-S (ITS Station) components. GTDM defines a Global Transport Data Format (GTDF) with standardized data classes, plus mechanisms for managing access, monitoring functions and optional sensor & control network (SCN) integration.
Keywords: C-ITS, GTDM, GTDF, ITS-S, global transport data management, ISO/TS 21184:2021.
Key topics and technical requirements
- Global data models: The framework is composed of four core data models:
- Global transport basic data model (GT basic) - structure and runtime/configuration for transport data.
- Global transport access control (GTAC) data model - role-based access permissions and authorization constructs.
- Global transport function monitor (GTFM) data model - configuration constructs to generate monitoring flow logic (e.g., parameter limit checks).
- Sensor and Control Network (SCN) data model (optional) - for integrating vehicle networks and ECU addressing.
- Global Transport Data Format (GTDF): Defines standardized data classes and packaging for consistent data exchange.
- Access control & security:
- Role-based mechanisms (GTAC) specify permission sets and control of data and functions.
- Certificate-based access is specified in accordance with IEEE 1609.2 certificates.
- GTDM is specified as an optional ITS-S capability (ITS-capabilities referenced per ISO 24102-6).
- Use-case coverage: Designed for proximity (V2X), on‑board, and remote ITS applications, plus configuration authoring and management.
- Management & facilities: Defines ITS-S roles (e.g., Configuration Provider, Data Provider, SCN Handler, GTP Handler, Function Monitor) and startup/management behaviors.
Applications and who uses it
- Vehicle OEMs & Tier‑1 suppliers: Standardize in-vehicle data models, secure access to vehicle data, diagnostic and ECU interfaces.
- ITS application developers: Build interoperable services that read/write GTDF data across vehicles, infrastructure and cloud.
- Road operators & traffic authorities: Integrate vehicle-sourced data into traffic management, incident detection and fleet operations.
- Cybersecurity architects & system integrators: Implement certificate-based role access and conform to ITS-S capability models.
- Aftermarket and telematics providers: Use GTDF for standardized telemetry, remote diagnostics and over-the-air configuration.
Keywords: GTAC, GTFM, GTDF, IEEE 1609.2, ITS-S capability, V2X, vehicle data exchange.
Related standards
- ISO 24102-6 - ITS-S capabilities (reference for optional GTDM capability)
- IEEE 1609.2 - certificate formats and security for access control
- ISO/TS 21177 - secure sessions for ITS (referenced in GTDM security clauses)
This specification supports interoperable, secure, role-based transport data exchange across vehicle, roadside and remote ITS ecosystems.