Partial Revision of Technical Regulations for Enforcement of the Radio Act

The Ministry of Internal Affairs and Communications (MIC) of Japan is proposing an amendment to the ministerial ordinance to enable usage of the 5G system.

Japan will make necessary amendments of technical regulations for the local 5G system to enable various players (ex. SMEs, farmers or local governments) excluding national mobile operators to establish and use private 5G network mainly in their property based on regional or industrial needs.

Amendments to ministerial ordinance:

  • Regulations for Enforcement of the Radio Act
  • Regulations for Radio Equipment Concerning Technical Regulations Conformity Certification of Specified Radio Equipment

Technical requirements of the local 5G system:

ItemDescription
Frequency band28.2 GHz – 28.3 GHz
Communication SystemTDD
Multiplexing and Multiple access method(1)Base Station: OFDM/TDM
(2)Mobile Station: OFDMA/SC-FDMA
Modulation method(1)Base Station: QPSK/16QAM/64QAM/256QAM
(2)Mobile Station: π/2-BPSK/QPSK/16QAM/64QAM/256QAM
Allowable deviation of occupied band width(1)Base Station: 50 MHz / 100 MHz
(2)Mobile Station: 50 MHz / 100 MHz
Allowable deviation of frequency(1)Base Station: ≦± (0.1 ppm+12 Hz)
(2)Mobile Station: ≦±0.105 ppm
Antenna Power(1) Base station: ≦5 dBm/MHz (outside), ≦0 dBm/MHz (inside)
(2) Mobile station: Maximum of Rated antenna power ≦ 23 dBm
Allowable deviation of Antenna Power(1) Base Station: ≦Rated antenna power ±5.1 dB
(2) Mobile Station: ≦Rated antenna power + 3.6 dB
Allowable deviation of absolute antenna gain(1) Base Station: ≦23 dBi
(2) Mobile Station: ≦ 20 dBi
Spurious emissionAppendix 1
Spectrum MaskAppendix 2
Adjacent channel leakage ratioAppendix 3
Secondary Radiated Emission StrengthAppendix 4

Appendix 1(Spurious emission):

(1) Base station
Frequency bandsLimit valueMeasurement bandwidth
30 MHz – 1,000 MHz-13 dBm100 kHz
From 1,000 MHz to less than twice from the top frequency excluding between 25.5 GHz and 31.0 GHz-13 dBm1 MHz
(2) Mobile station
Frequency bandsLimit valueMeasurement bandwidth
6 GHz – 12.75 GHz-30 dBm1 MHz
From 12.75 GHz to less than twice from the top frequency-13 dBm1 MHz

Appendix 2(Spectrum Mask):

(1) Base station
Frequency offset, f_offset (MHz)Spectrum MaskMeasurement bandwidth
0.5MHz≦f_offset < 0.1 bandwidth +0.5MHz-2.3 dBm1 MHz
0.1bandwidth+0.5MHz≦f_offset-13 dBm1 MHz
(2) Mobile station
Frequency offset, f_offset (MHz)Spectrum Mask (dBm)/Channel BWMeasurement bandwidth
± 0 MHz – 5 MHz50 MHz: 1.5 dBm
100 MHz: 1.5 dBm
1 MHz
± 5 MHz – 10 MHz 50 MHz: -6.5 dBm
100 MHz: 1.5 dBm
1 MHz
± 10 MHz – 100 MHz 50 MHz: -6.5 dBm
100 MHz: -6.5 dBm
1 MHz
± 100 MHz – 200 MHz 50 MHz: N/A
100 MHz: -6.5 dBm
1 MHz

Appendix 3(Adjacent channel leakage ratio):

(1) Base station
Channel bandwidthAbsolute/relativeFrequency detuningLimitMeasurement bandwidth
50 MHzAbsolute value50 MHz-10.3 dBm/MHz47.52 MHz
Relative value50 MHz-25.7 dBc47.52 MHz
100 MHzAbsolute value100 MHz-10.3 dBm/MHz95.04 MHz
Relative value100 MHz-25.7 dBc95.04 MHz
(2) Mobile station
Channel bandwidthAbsolute/relativeFrequency detuningLimitMeasurement bandwidth
50 MHzAbsolute value50 MHz-35 dBm47.52 MHz
Relative value50 MHz-10.7 dBc47.52 MHz
100 MHzAbsolute value100 MHz-35 dBm95.04 MHz

Appendix 4(Secondary radiated emission strength):

(1) Base station
Frequency bandsLimit valueMeasurement bandwidth
30 MHz - 1,000 MHz-54.5 dBm100 kHz
1,000 MHz - 12.75 GHz-44.3 dBm1 MHz
From 12.75 MHz to less than twice from the top frequency excluding between 25.5 GHz and 31 GHz-36 dBm1 MHz
(2) Mobile station
Frequency bandsLimit valueMeasurement bandwidth
6 GHz - 20 GHz-36.8 dBm1 MHz
20 GHz - 40 GHz-29.8 dBm1 MHz
Over 40 GHz less than twice from the top frequency-13.9 dBm1 MHz

The final date for comments on this proposed update is 9/17/2019.

This update will enter into force December of 2019.

Thinking about compliance testing and certification?

Contact us today for a free consultation or more information.

Get In Touch