ARIB STD-T75

ARIB STD-T75 defines the technical requirements for Dedicated Short Range Communications (DSRC) in the 5.76–5.92 GHz band, used primarily for Intelligent Transport Systems (ITS) such as Electronic Fee Collection (EFC). The standard specifies radio parameters, → Channel Bandwidth, access methods, and compliance requirements under Japan’s Radio Law.

Scope and Application

The standard applies to short-range vehicle communication systems including:

• On-Board Units (OBU) for vehicles

• Roadside Units (RSU) for tolling and traffic management

• Electronic Fee Collection (EFC) systems

• Vehicle-to-Infrastructure (V2I) communication

Frequency Range and Operation

• Operating band: 5.76–5.92 GHz

• Channel bandwidth: typically 4.4–9 MHz

• Access methods:

  • Time Division Multiple Access (TDMA): Divides time into slots to avoid collisions.

  • Slotted ALOHA: Random slot-based transmission method with retransmission after collisions.

Power Limits

• On-Board Units (OBU): up to 500 mW

• Roadside Units (RSU): up to 2 W

Certification and Labeling

Equipment must comply with ARIB STD-T75 to qualify for certification under Japan’s Radio Law. Devices are tested by Registered Certification Bodies (RCBs) and must bear the Giteki mark and certification number before market entry.

For support with testing and approval, see our → MIC Certification Services.

Note
A comprehensive overview of device categories, certification process, and Giteki marking can be found in the guide → MIC Requirements – Overview.