ISO 17515-3:2019

Overview

ISO 17515-3:2019 - "Intelligent transport systems - E-UTRA - Part 3: LTE-V2X" specifies how LTE-V2X (E-UTRA vehicle-to-everything) is used as an ITS access technology. The standard defines the ITS-LTE-V2X communication interface (CI) for ITS stations, referencing 3GPP LTE/V2X specifications and specifying the Communication Adaptation Layer (CAL) and the Management Adaptation Entity (MAE) required by ISO 21218. ISO 17515-3 enables LTE features - including cellular, device-to-device (D2D) and V2X modes - to be integrated into ITS station units to support cooperative and localized ITS services.

Key topics and technical requirements

• Scope & intent: Defines ITS-S access layer behavior for ITS-LTE-V2X and how LTE-V2X is applied in ITS stations.
• Reference to 3GPP: Uses 3GPP LTE and LTE-V2X specifications (e.g., E-UTRA, RRC, V2X architecture) as the radio and protocol baseline.
• CAL and MAE: Specifies the Communication Adaptation Layer and Management Adaptation Entity functions required by ISO 21218, including management parameters, MI-COMMANDs and MI-REQUESTs.
• Protocol stack: Covers physical and data link layer expectations, data link addresses (layer‑2 ID), and higher‑layer identification.
• Operational modes: Supports operation with network infrastructure (eNB/Uu) and without infrastructure (PC5/D2D sidelink) per 3GPP V2X.
• Procedures & behavior: Includes transmit/receive procedures, CI connection, CI state management, cross-CI prioritization and MAC address mapping.
• Conformance & testing: Defines conformance clauses and test method references; normative annexes provide CI parameters, ASN.1 definitions, and command/request schemas.

Applications and users

ISO 17515-3 is intended for practical deployment of LTE-V2X in Intelligent Transport Systems:

• Vehicle OEMs and suppliers implementing ITS station units and onboard units (OBUs).
• Roadside and infrastructure vendors integrating V2I services.
• Mobile network operators and V2X service providers deploying V2N and V2X-enabled services.
• Systems integrators and test laboratories validating CAL/MAE behavior, conformance and interoperability.
• Standards bodies and regulators aligning ITS deployments with 3GPP and ISO ITS architecture.

Use cases include Cooperative ITS, urban traffic management, safety-critical V2V alerts, V2P pedestrian protection, and hybrid communications combining LTE and other ITS access technologies.

Related standards

• ISO 21217 (CALM architecture) and ISO 21218 (Hybrid communications - Access technology support)
• ISO 24102 series (ITS station management)
• 3GPP specifications (e.g., TS 36.300, TS 36.331, TS 23.285, TS 24.386)
• ISO/IEC ASN.1 standards referenced for message encoding

Keywords: ISO 17515-3:2019, ITS-LTE-V2X, LTE-V2X, E-UTRA, CAL, MAE, ITS station, V2X, D2D, 3GPP.