ISO/TS 17429:2017

Overview

ISO/TS 17429:2017 specifies ITS station facilities to enable standardized information exchange between Intelligent Transport Systems (ITS) stations for Cooperative ITS (C-ITS). Aligned with the ITS station reference architecture (ISO 21217), the technical specification defines a facilities layer that provides reusable, technology‑agnostic mechanisms so ITS applications can share data reliably, securely and with selectable performance levels.

Key topics and requirements

• Core facilities layer functions:
  • Communication Profile Handler (CPH) - selects and applies communication profiles to data flows, manages flow parameters, path/address resolution and reporting.
  • Facilities Services Handler (FSH) - provides well‑known facilities and management services that applications can reuse instead of implementing themselves; defines ITS‑FPDU format.
  • Content Subscription Handler (CSH) - supports publish/subscribe of data objects based on data dictionaries and routes content to interested ITS‑S application processes.
• Service access and primitives:
  • FA‑SAP primitives for application ↔ facilities interaction (e.g., TransmitFlowData, ReceiveFlowData, PublishContent, SubscribeContent, CancelContent, ReceiveContent).
  • NF‑SAP primitives for facilities ↔ lower layers (e.g., ReceiveNTSDU, TransmitNTSDU).
• Profiles and requirements:
  • Defines communication requirements/objectives (profiles) using ISO/TS 17423 methods to choose performance (best‑effort, real‑time), confidence and security levels (authentication, encryption) for exchanges such as data provision, event notification, roadside configuration and map updates.
• Conformance and initialization: startup/initialization, flow registration, statistics reporting and management operations are specified to ensure interoperable behavior.

Practical applications and users

• Who uses it:
  • ITS system architects and software developers building C‑ITS applications for vehicles, roadside units and central traffic management systems.
  • Vendors of ITS station middleware and communications stacks who need standardized facilities layer implementations.
  • Traffic authorities and integrators deploying interoperable roadside infrastructure, event reporting and map update services.
• Practical benefits:
  • Enables reuse of facilities services across applications, reducing implementation cost.
  • Standardizes publish/subscribe and flow handling so heterogeneous ITS stations can share sensor data, CAM/TPEG/DATEX II messages, event notifications and configuration commands.
  • Supports selectable performance and security profiles suitable for real‑time safety or best‑effort efficiency use cases.

Related standards

• ISO 21217 (ITS station reference architecture)
• ISO/TS 17423 (profile selection methods)
• ISO 24102‑3 (service access point primitives)
• ISO/TS 17419, ETSI data dictionaries, DATEX II, TPEG, SAE J2735 (message/data object context)

Keywords: ISO/TS 17429:2017, Intelligent Transport Systems, C-ITS, ITS station facilities, Communication Profile Handler, Content Subscription Handler, Facilities Services Handler, ITS data exchange, ITS profiles, publish/subscribe.