ISO 24102-3:2018

Overview - ISO 24102-3:2018 (ITS station management - Service access points)

ISO 24102-3:2018 defines the service access points (SAPs) used for management within an ITS (Intelligent Transport Systems) station. It specifies the interfaces between the ITS‑S management and security entities and the ITS station protocol layers (access, networking & transport, facilities), and the interfaces between application entities and management/security. The document supplies the abstract syntax for those interfaces using ASN.1 and lists service primitives (requests, confirms, commands) that drive management and control of protocol layers.

Key facts:

• Part of the ISO 24102 multipart series for ITS station management.
• Uses ASN.1 modules (normative) and references ASN.1 PER encoding (ISO/IEC 8825-2).
• Defines SAPs such as MI‑SAP, MN‑SAP, MF‑SAP, MS‑SAP, MA‑SAP, SA‑SAP, plus SI/SN/SF and FA SAPs.
• Specifies service primitives (e.g., MI‑SET, MI‑GET, XY‑COMMAND/REQUEST) and error/return codes.

Key topics and technical requirements

• Service access points and primitives: Formal definitions of the management SAPs and the service primitives used for control, configuration and status exchange between entities.
• Abstract syntax (ASN.1): Management interfaces are specified using ASN.1 modules (included as normative annexes) to ensure unambiguous message structure.
• Layered interfaces: Clear separation of responsibilities between ITS‑S management entity, security entity, access layer, network & transport layer, and facilities layer.
• Security & application interfaces: SAPs defined to coordinate security functions and application-level management.
• Conformance and error handling: Normative annexes for error/return codes and guidance on service primitive functions to support interoperability and testing.
• Distributed management model: Management within ITS stations is specified as a distributed process (no single supervisory entity).

Practical applications - who uses ISO 24102-3

• ITS equipment manufacturers and firmware developers implementing ITS stations (OBUs, RSUs).
• System integrators designing ITS station software stacks and internal APIs between layers.
• Security architects ensuring correct interfaces between management and security entities.
• Test labs and certification bodies validating conformance and interoperability of ITS station implementations.
• Standards bodies and procurement teams referencing interface-level requirements for interoperable ITS deployments (V2X, road-side systems, traffic management).

Related standards

• ISO 24102 series (ITS station management)
• ISO 21217 (ITS station reference architecture / CALM)
• ISO/IEC 8825-2 (ASN.1 Packed Encoding Rules - PER)
• Note: ISO 22418 (related former part converted into a separate standard)

ISO 24102-3:2018 is essential when you need precise, interoperable definitions of ITS station management interfaces and service primitives to ensure robust, secure ITS deployments.