Overview
EN ISO 17423:2025 - Intelligent transport systems: Application requirements and objectives defines how ITS applications express their communication needs to an ITS station (ITS‑S) so the station unit (ITS‑SU) can automatically select an appropriate communication profile. Published by CEN as the European adoption of ISO 17423:2025, this standard updates and supersedes EN ISO 17423:2018 and standardizes the parameters, procedures and objectives used for both static and dynamic ITS‑S communication profile selection.
Key topics
- Communication Service Parameters (CSPs) - a structured abstraction that application processes present to ITS‑S management. CSP classes include:
- Operational CSPs: session continuity, logical channel, ADU generation rate, flow type, maximum priority, port number, expected flow lifetime.
- Destination CSPs: destination type and domain, communication distance, directivity.
- Performance CSPs: resilience, minimum throughput, maximum latency, maximum ADU size.
- Security CSPs: confidentiality, integrity, non‑repudiation, source authentication.
- Protocol CSPs: protocol stack and specific protocol needs.
- CSPs for sinks and an overview to guide presentation and interpretation.
- Policies and Regulations: cost rules (flat rates, rate limits per data unit/connection/time), station anonymity and location privacy, and station authentication requirements.
- ITS‑S Procedures: high‑level procedures for presenting CSPs, monitoring communications capabilities and regulatory constraints, selecting ITS‑S communication profiles, interacting with users, and supporting other application processes.
- Supporting Material: ASN.1 modules (normative), examples of CSP presentation, and communication objectives used to estimate optimum profiles.
Applications and users
EN ISO 17423:2025 is practical for:
- ITS architects and system integrators designing stations and service logic that require automated transport‑layer decisions.
- ITS‑S/ITS‑SU hardware and firmware vendors implementing profile selection engines and CSP interfaces.
- Software developers of ITS applications that must declare communication requirements (e.g., V2X services, telematics, traffic management).
- Transport authorities and operators defining policies (cost, privacy, authentication) for deployed ITS services.
- Cybersecurity and privacy officers ensuring application requirements map to appropriate security controls.
Practical use cases include automatic selection between cellular, DSRC/ITS‑G5 or hybrid stacks, tailoring QoS and security settings for safety-critical messages, and dynamic profile switching in response to changing network conditions or policies.
Related standards
- This document is produced under ISO/TC 204 and CEN/TC 278 and aligns with the ISO family of Intelligent Transport Systems standards. It is the authoritative reference for CSP definitions, profile selection procedures and ASN.1 modules used in ITS communication management.
