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Japan MIC Certification FAQs

Here’s the expanded content for the Recent Guidance for Japan MIC Certification FAQs section, with some clarifications and additional details:

Recent Guidance for Japan MIC Certification FAQs

Clarification of Reporting Required

MIC has recently updated its requirements for Certification Bodies (CBs), now mandating that the test report, external photos, and certificate exhibits be submitted directly to MIC. As part of these changes, MIC expects to see a summary table of the Interference Prevention Function, along with other essential items necessary for Certification.

Measurements Required

Screenshots of data collected are required for the following:

  • Occupied bandwidth at the rated voltage
  • Unwanted emissions at the rated voltage
  • Adjacent channel power
  • Out of band power

Test summary (screenshots not required):

  • Interference protection
  • Carrier sense
  • DFS (Dynamic Frequency Selection)
  • SAR (Specific Absorption Rate)

Interference Protection Guidance

The interference prevention function is a requirement for client devices to send an identification code to the master device, identifying itself as a valid/authorized client. For compliance, the client device must transmit a MAC address (48 bits) to the master device. This requirement applies to all 2.4 GHz devices, including WLAN, Bluetooth, ZigBee, and other wireless communication protocols using IEEE 802.xx standards.

To demonstrate compliance, a screenshot should be taken to show that the MAC address is 48 bits long. This requirement prevents unauthorized devices from connecting to the master device, thereby preventing interference.

Tools for verification:

Labeling

  • 5.1-5.15 GHz Operation:
    Devices operating in the 5.15-5.25 and 5.25-5.35 GHz bands are restricted to indoor use only in Japan. Labeling Requirement:
    • Label: “電波法により5.2/5.3 GHz帯は屋内使用に限ります”
      (Translation: “5.2/5.3 GHz band is restricted to indoor use due to the Radio Law.”)
  • Module Integration:
    If your device integrates a Wi-Fi module already certified in Japan, the host device does not need to be certified again. However, it must carry a statement indicating that it contains a certified radio module. Suggested Text for Product Label:
    • “当該機器には電波法に基づく、技術基準適合証明等を受けた特定無線設備を装着している”
      (Translation: “This equipment contains specified radio equipment that has been certified to the Technical Regulation Conformity Certification under the Radio Law.”)

Permissive Changes

When changes are made to a certified device, the certification body must be notified to determine if the same certification number can still be used. Permissive changes require submission to the original certification body, which will review and issue a new certificate if necessary. It is recommended to consult with the certification body for guidance on testing and documentation for permissive changes.

Output Power Measurement for Bluetooth Hopping Devices

The correct method for measuring RF output power for Bluetooth is when the device is hopping.

  • Formula:
    • Antenna power (mW/MHz) = output power (mW) / Burst Ratio / Spreading Bandwidth (MHz)

Compliance with Telecommunications Business Law

Devices that connect to the public network must comply with Article 9 of the Telecommunications Business Law, ensuring a minimum Quality of Service (QoS) for users. These devices must transmit an identification code to identify themselves on the network.

Duplicate Filing/Change of Certificate Holder

Unlike the FCC’s change of ID process, Japan does not have a formal “change of ID” process. However, a new certificate can be issued under a different certificate holder’s name based on existing documentation. This requires additional exhibits, such as the application form, technical specifications, quality control procedures, and approval from the original certificate holder.

RF Exposure Requirements

Japan has RF exposure regulations for head and body SAR, but these do not apply to 2.4/5 GHz (Wi-Fi, BT, BLE) transceivers used in stand-alone configurations. However, when integrated into devices with cellular transceivers (e.g., 3G/4G/5G), SAR regulations may apply if the device is used within 20 cm of the human body.

401-406 MHz MEDS/MICS Interference Protection Requirements

For devices operating in the 401-406 MHz band, interference protection is required, including ID codes for identifying the transmitter. The transmission must meet specific interference prevention functions to avoid conflicts with other devices.

Japan Quality Assurance Compliance

MIC requires ongoing compliance with the radio parameters under the Japanese Radio Law. An ISO certificate is usually sufficient, but if unavailable, a signed declaration outlining the manufacturer’s quality control procedures must be provided to ensure continued compliance.

This comprehensive guide should clarify the key points and recent updates related to MIC Certification in Japan. Let me know if you need further adjustments or additional information!

Radio Approval Regulations in Japan

https://acbcert.com/wp-content/uploads/ACB-Japan-Radio-Regulations-28-March-2024.pdf

Japan Radio Regulations
Japan Ministry of Internal Affairs and Communications (MIC)
Japan MIC Certification FAQs