ARIB STD-T75

ARIB STD-T75, Dedicated Short-Range Communication System, specifies the radio air interface between land mobile stations and base stations in Japan’s 5.8 GHz Dedicated Short-Range Communication (DSRC) system. These links support Intelligent Transport System (ITS) applications such as electronic fee collection and other vehicle-to-infrastructure services.

The current edition is Version 1.6, published on March 18, 2020. It incorporates updates related to ISO 15628 and ISO 14906, revised legal references and communication-control parameters.

Scope and System Components

The standard addresses communication between:

• base stations installed at the roadside;

• land mobile stations installed in vehicles; and

• test stations used to evaluate land mobile radio equipment.

It defines the air-interface characteristics needed for communication between these station types, including radio parameters, channel bandwidth, access control and interoperability-related procedures.

Radio Access and Output Power

ARIB STD-T75 uses a combined TDMA-FDD arrangement with adaptive slotted ALOHA as the media-access method. Within this scheme, TDMA-FDD provides the frame and duplex structure, while adaptive slotted ALOHA governs media access.

The standard distinguishes two transmit-output-power classes according to the size of the radio communication zone. They apply to both base stations and land mobile stations:

• Class 1: up to 10 mW for a communication zone below approximately 10 m;

• Class 2: up to 300 mW for a communication zone exceeding approximately 10 m but remaining within approximately 30 m.

The applicable class and the remaining technical parameters must be assessed for the specific station configuration and use case.

Certification and Labelling

Equipment intended for the Japanese market must meet the applicable MIC technical regulations and follow the appropriate certification route through a Registered Certification Body (RCB). Certified radio equipment carries the Giteki mark and its certification information.

For support with testing and approval, see our MIC certification services.

Japan market-access guidance
Our MIC requirements overview explains the relevant equipment categories, certification routes and marking requirements.