1 
 The Outline of Proposed Amendment to Ministerial Ordinance 
 
１ Item 
Partial revision of Regulations for Enforcement of the Radio Act etc 
 
２ Amendment to ministerial ordinance 
 Regulations for Enforcement of the Radio Act 
    Regulations for Radio Equipment 
    Concerning Technical Regulations Conformity Certification of Specified Radio 
Equipment 
 
３ Reasons for amendment 
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. 
 
４ Outline of the amendment 
   Technical requirements of the local 5G system 
Item Description 
Frequency band 28.2 GHz – 28.3 GHz 
Communication System TDD 
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  
2 
 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 emission Appendix 1 
Spectrum Mask Appendix 2 
Adjacent channel leakage ratio Appendix 3 
Secondary Radiated Emission 
Strength Appendix 4 
 
Appendix 1（Spurious emission） 
(1) Base station 
Frequency bands Limit value Measurement bandwidth 
30 MHz – 1,000 MHz -13 dBm 100 kHz 
From 1,000 MHz to less than twice from 
the top frequency excluding between 
25.5 GHz and 31.0 GHz -13 dBm 1 MHz 
 
(2) Mobile station  
Frequency bands Limit value Measurement bandwidth 
6 GHz – 12.75 GHz - 30 dBm 1 MHz 
From 12.75 GHz to less than twice from 
the top frequency - 13 dBm 1 MHz 
 
 
Appendix 2 (Spectrum Mask) 
(1) Base Station 
Frequency offset, f_offset (MHz) Spectrum Mask Measurement 
bandwidth 
0.5MHz f_offset <0.1bandwidth+0.5MHz - 2.3 dBm 1 MHz 
0.1bandwidth+0.5MHz  f_offset - 13 dBm 1 MHz 
 
  
3 
 (2) Mobile Station 
Frequency offset Spectrum Mask (dBm)/ 
Cannel bandwidth Measurement 
bandwidth 
50 MHz 100 MHz 
 0 MHz – 5 MHz 1.5 1.5 1 MHz 
 5 MHz – 10 MHz -6.5 1.5 1 MHz 
 10 MHz – 100 MHz -6.5 -6.5 1 MHz 
 100 MHz – 200 MHz  -6.5 1 MHz 
 
Appendix 3 ( Adjacent channel leakage ratio ) 
(1) Base Station 
Channel 
bandwidth  
Frequency 
detuning Limit value Channel 
measurement 
bandwidth 
50 MHz Absolute value 50 MHz -10.3 dBm/MHz 47.52 MHz 
Relative value 50 MHz -25.7 dBc 47.52 MHz 
100 MHz Absolute value 100 MHz -10.3 dBm/MHz 95.04 MHz 
Relative value 100 MHz -25.7 dBc 95.04 MHz 
 
(2) Mobile Station 
Channel 
bandwidth  
Frequency 
detuning Limit value Channel 
measurement 
bandwidth 
50 MHz Absolute value 50 MHz -35 dBm 47.52 MHz 
Relative value 50 MHz -10.7 dBc 47.52 MHz 
100 MHz Absolute value 100 MHz -35 dBm 95.04 MHz 
 
Appendix 4（Secondary Radiated Emission Strength） 
(1) Base station 
Frequency bands Limit value Measurement bandwidth 
30MHz – 1,000 MHz -54.5 dBm 100 kHz 
1,000 MHz – 12.75 GHz -44.3 dBm 1 MHz 
From 12.75 MHz to less than twice from 
the top frequency excluding between 
25.5 GHz and 31 GHz -36 dBm 1 MHz  
4 
  
(2) Mobile station 
Frequency bands Limit value Measurement bandwidth 
6 GHz – 20 GHz -36.8 dBm 1 MHz 
20 GHz – 40GHz -29.8 dBm 1 MHz 
Over 40 GHz less than twice from the 
top frequency -13.9 dBm 1 MHz 
 
５ Proposed date of entry into force 
December, 2019