The Outline of Proposed Amendment to Ministerial Ordinance 
 
１ Item 
Partial revision of Regulations for Radio Equipment etc. 
 
２ Amendment to ministerial ordinance 
Regulations for Radio Equipment 
 
３ Reasons for amendment 
Considering the situation that the traffic of the mobile communications is increasing 
every year, it is necessary to make connection of Wireless LAN (WLAN) more efficient 
in Japan. To meet these demands, we make the technical standards of the WLAN 
System for the expansion of use the WLAN system extends to the 5.925GHz to 
6.425GHz Band.  
The 2019 ITU World Radiocommunication Conference (WRC-19) made a decision to 
make 5.2GHz band wireless LAN available in automobiles. To meet these demands, we 
arrange the technical standards of the WLAN System. 
 
４ Outline of the amendment 
Technical requirements of radio equipment 
(The following items written in red indicate are points to change.) 
Item  
Name Wireless LAN System (2.4/5.2/5.3/5.6/6GHz band) 
Frequency band 2400MHz to 2483.5MHz 
5150MHz to 5350MHz 
5470MHz to 5730MHz 
5925MHz to 6425MHz 
Communication 
Systems  Unidirectional, Simplex, Half-Duplex and Duplex 
Modulation DS-SS, Amplitude Modulation, Phase Modulation, Frequency Modulation, 
Pulse Modulation or these combination, and OFDM  
Max Bit-rate (5150MHz to 5350MHz, 5470MHz to 5730MHz and 5925MHz to 
6425MHz) 
・20MHz system : more than 20 Mbps  
・40MHz system : more than 40 Mbps [様式Ｂ]  
・80MHz system : more than 80 Mbps 
・160MHz system : more than 160 Mbps 
OBW (2400MHz to 2483.5MHz) 
・20MHz system : 26 MHz 
・40MHz system : 40 MHz 
(5150MHz to 5350MHz and 5470MHz to 5730MHz) 
・20MHz system : 20 MHz (OFDM), 18 MHz (other modulations) 
・40MHz system : 40 MHz 
・80MHz system : 80 MHz 
・160MHz system : 160 MHz 
(5925MHz to 6425MHz) 
・20MHz system : 20 MHz (OFDM) 
・40MHz system : 40 MHz(OFDM) 
・80MHz system : 80 MHz(OFDM) 
・160MHz system : 160 MHz(OFDM) 
Allowable 
deviation of 
frequency ・2400MHz to 2483.5MHz：±50×10-6 
・5150MHz to 5350MHz, 5470MHz to 5730MHz and 5925MHz to 
6425MHz：±20×10-6 
Antenna Power 
  
Frequency band Modulations Antenna Power 
2400MHz 
to 
2483.5MHz FH 3 mw/MHz 
DS-SS (excepting FH-DS) 10 mW/MHz 
OFDM 
(excepting FH-OFDM) 20MHz system 10 mW/MHz 
40MHz system 5 mW/MHz 
other modulations 10 mW 
5150MHz - 
5350MHz 
 DS-SS 10 mW/MHz 
OFDM 20MHz system 10 mW/MHz 
(without 
connecting ) 
40MHz system 5 mW/MHz 
(without ) 
80MHz system 2.5 mW/MHz 
(without ) 
160MHz system 1.25 mW/MHz 
other modulations 10 mW 
5470MHz - 
5730MHz DS-SS 10 mW/MHz 
OFDM 20MHz system 10 mW/MHz 
40MHz system 5 mW/MHz 
80MHz system 2.5 mW/MHz 
160MHz system 1.25 mW/MHz 
other modulations 10 mW/MHz 
5925MHz - 
6425MHz OFDM 20MHz system 10 mW/MHz 
40MHz system 5 mW/MHz 
80MHz system 2.5 mW/MHz 
160MHz system 1.25 mW/MHz 
  
EIRP 
 (unlicensed 5.2/5.3/5.6/6GHz WLAN system)  
Frequency band  EIRP 
5150MHz 
to 
5250MHz 20MHz system 10 mW/MHz (use in cars; 2mW/MHz) 
40MHz system 5 mW/MHz (use in cars; 1mW/MHz) 
80MHz system 2.5 mW/MHz (use in cars; 0.5mW/MHz) 
5250MHz 
to 
5350MHz 20MHz system 10 mW/MHz (without TPC support; 5 mW/MHz) 
40MHz system 5 mW/MHz (without TPC support; 2.5 mW/MHz) 
80MHz system 2.5 mW/MHz 
(without TPC support; 1.25 mW/MHz) 
5470MHz 
to 
5730MHz 20MHz system 50 mW/MHz 
(without TPC support; 25 mW/MHz) 
40MHz system 25 mW/MHz 
(without TPC support; 12.5 mW/MHz) 
80MHz system 12.5 mW/MHz 
(without TPC support; 6.25 mW/MHz) 
160MHz system 6.25 mW/MHz 
(without TPC support; 3.125 mW/MHz) 
5925MHz 
to 
6425MHz 20MHz system Low Power Indoor (LPI); 10mW/MHz 
Very Low Power (VLP); 1.25mW/MHz 
40MHz system LPI; 5mW/MHz 
VLP; 0.625mW/MHz 
80MHz system LPI ; 2.5mW/MHz 
VLP; 0.3125mW/MHz 
160MHz system LPI; 1.25mW/MHz 
VLP; 0.15625mW/MHz 
(registered 5.2GHz High-power WLAN system)  
 elevation angle θ (degree) Max EIRP (dBW/MHz) 
20MHz system < 8 -13 
8 to 40 -13 – 0.716(θ- 8) 
40 to 45 -35.9 – 1.22(θ- 40) 
45 < -42 
40MHz system < 8 -16 
8 to 40 -16 – 0.716(θ- 8) 
40 to 45 -38.9 – 1.22(θ- 40) 
45 < -45 
80MHz system < 8 -19 
8 to 40 -19 – 0.716(θ- 8) 
40 to 45 -41.9 – 1.22(θ- 40) 
45 < -48 
  
 
Allowable 
deviation of 
Antenna Power (5470MHz to 5730MHz, 5925MHz to 6425MHz)   -80 to +20% 
(others)   -50 to +50% 
Spectrum Mask 
(1) OBW is less than 18MHz：Average powers within the ± 9MHz regions 
of 20MHz and 40MHz separations from the 
carrier frequency are respectively 25dB and 
40dB less than the average power of the 
carrier frequency. 
OBW is 18MHz to 20MHz：Average powers within the ± 10MHz 
regions of 20MHz and 40MHz separations 
from the carrier frequency are respectively 
25dB and 40dB less than the average power 
of the carrier frequency. 
OBW is 20MHz to 40MHz：Average powers within the ± 20MHz 
regions of 40MHz and 80MHz separations 
from the carrier frequency are respectively 
25dB and 40dB less than the average power 
of the carrier frequency. 
OBW is 40MHz to 80MHz：Average power within the ± 40MHz region 
of 80MHz separation from the carrier 
frequency are 25dB less than the average 
power of the carrier frequency. 
  
Spectrum Mask 
(2) (unlicensed 5.2/5.3GHz WLAN system) 
OBW reference 
channel applied frequency region Allowable unwanted emission 
level(EIRP) 
≦ 18MHz 5240MHz ≦ 5142MHz 2.5 μW/MHz 
5142MHz - 5150MHz 15 μW/MHz 
5250MHz - 5251MHz 101-(f-9) mW/MHz 
5251MHz - 5260MHz 10-1-(8/90)(f-11) mW/MHz 
5260MHz - 5266.7MHz 10-1.8-(6/50)(f-20) mW/MHz 
5266.7MHz ≦ 2.5 μW/MHz 
5260MHz ≦ 5233.3MHz 2.5μW/MHz 
5233.3MHz -5240MHz 10-1.8-(6/50)(f-20) mW/MHz 
5240MHz - 5249MHz 10-1-(8/90)(f-11) mW/MHz 
5249MHz - 5250MHz 101-(f-9) mW/MHz 
5350MHz ≦ 2.5 μW/MHz 
18MHz to 
20MHz 5180MHz ≦ 5142MHz 2.5 μW/MHz 
5142MHz - 5150MHz 15 μW/MHz 
5240MHz 5250MHz – 5250.2MHz 101-(8/3)(f-9.75) mW/MHz 
5250.2MHz - 5251MHz 101-(f-9) mW/MHz 
5251MHz - 5260MHz 10-1-(8/90)(f-11) mW/MHz 
5260MHz - 5266.7MHz 10-1.8-(6/50)(f-20) mW/MHz 
5266.7MHz ≦ 2.5μW/MHz 
5260MHz ≦ 5233.3MHz 2.5 W/MHz 
5233.3MHz - 5240MHz 10-1.8-(6/50)(f-20) mW/MHz 
5240MHz - 5249MHz 10-1-(8/90)(f-11) mW/MHz 
5249MHz - 5249.8MHz 101-(f-9) mW/MHz 
5249.8MHz - 5250MHz 101-(8/3)(f-9.75) mW/MHz 
5320MHz 5350MHz ≦ 2.5 W/MHz 
20MHz to 
40MHz 5190MHz ≦ 5141.6MHz 2.5μW/MHz 
5141.6MHz - 5150MHz 15μW/MHz 
5230MHz 5250MHz - 5251MHz 10-(f-20)+log(1/2) mW/MHz 
5251MHz - 5270MHz 10-(8/190)(f-21)-1+log(1/2) mW/MHz 
5270MHz - 5278.4MHz 10-(3/50)(f-40)-1.8+log(1/2) mW/MHz 
5278.4MHz ≦ 2.5 μW/MHz 
5270MHz ≦ 5200MHz 2.5 μW/MHz 
5200MHz - 5221.6MHz 2.5 μW/MHz 
5221.6MHz - 5230MHz 10-(3/50)(f-40)-1.8+log(1/2) mW/MHz 
5230MHz - 5249MHz 10-(8/190)(f-21)-1+log(1/2) mW/MHz 
5249MHz - 5250MHz 10-(f-20)+log(1/2) mW/MHz 
5310MHz 5350MHz - 5358.4MHz 15μW/MHz 
5358.4MHz ≦ 2.5 μW/MHz 
40MHz to 
80MHz 5210MHz ≦ 5123.2MHz 2.5 μW/MHz 
5123.2MHz - 5150MHz 15 μW/MHz 
5250MHz - 5251MHz 10-(f-40)+log(1/4) mW/MHz 
5251MHz - 5290MHz 10-(8/390)(f-41)-1+log(1/4) mW/MHz 
5290MHz - 5296.7MHz 10-(3/100)(f-80)-1.8+log(1/4) mW/MHz 
5296.7MHz - 5480MHz 2.5 μW/MHz 
5290MHz ≦ 5203.3MHz 2.5 μW/MHz 
5203.3MHz - 5210MHz 10-(3/100)(f-80)-1.8+log(1/4) mW/MHz 
5210MHz - 5249MHz 10-(8/390)(f-41)-1+log(1/4) mW/MHz 
5249MHz - 5250MHz 10-(f-40)+log(1/4) mW/MHz 
5350MHz - 5376.8MHz 15 μW/MHz 
5376.8MHz ≦ 2.5 μW/MHz 
80MHz to 
160MHz 5250MHz ≦ 5099.6MHz 2.5 μW/MHz 
5099.6MHz - 5150MHz 15 μW/MHz 
5350MHz - 5400.4MHz 15 μW/MHz 
5400.4MHz ≦ 2.5 μW/MHz 
' f ' is the separation from the carrier frequency. (unit : MHz)  
(unlicensed 5.6GHz WLAN system) 
 
(unlicensed 5.2GHz WLAN system use in cars)  
OBW reference 
channel applied frequency 
region Allowable unwanted emission 
level 
(EIRP) 
< 20MHz 5180MHz ≦ 5142MHz 0.5μW/MHz 
5142MHz - 5150MHz 3μW/MHz 
5240MHz 5250MHz – 5250.2MHz 0.2x101-(8/3)(f-9.75) mW 
5250.2MHz - 5251MHz 0.2x101-(f-9)mW/MHz 
5251MHz - 5260MHz 0.2x10-1-(8/90)(f-11)mW/MHz 
5260MHz - 5266.7MHz 0.2x10-1.8-(6/50)(f-20)mW/MHz 
5266.7MHz ≦ 0.5μW/MHz 
20MHz to 
40MHz 5190MHz ≦ 5141.6MHz 0.5μW/MHz 
5141.6MHz - 5150MHz 3μW/MHz 
5230MHz 5250MHz - 5251MHz 0.2x10-(f-20)+log(1/2)mW/MHz 
5251MHz - 5270MHz 0.2x10-(8/190)(f-21)-1+log(1/2)mW/
MHz 
5270MHz - 5278.4MHz 0.2x10-(3/50)(f-40)-1.8+log(1/2)mW/
MHz 
5278.4MHz ≦ 0.5μW/MHz 
40MHz to 
80MHz 5210MHz ≦ 5123.2MHz 0.5μW/MHz 
5123.2MHz - 5150MHz 3μW/MHz 
5250MHz - 5251MHz 0.2x10-(f-40)+log(1/4)mW/MHz 
5251MHz - 5290MHz 0.2x10-(8/390)(f-41)-1+log(1/4)mW/
MHz 
5290MHz - 5296.7MHz 0.2x10-(3/100)(f-80)-1.8+log(1/4)mW/
MHz 
5296.7MHz ≦ 0.5μW/MHz 
' f ' is the separation from the carrier frequency. (unit : MHz) 
 
(registered 5.2GHz High-power WLAN system)  
OBW reference 
channel applied frequency 
region Allowable unwanted emission 
level 
(EIRP) 
< 18MHz 5240MHz ≦ 5142MHz 12.5μW/MHz 
5142MHz - 5150MHz 75μW/MHz OBW applied frequency region Allowable unwanted emission level(EIRP) 
≦ 20MHz 
(OFDM) < 5460MHz 2.5 μW/MHz 
5460MHz - 5470MHz 
5730MHz - 5765MHz 12.5 μW/MHz 
5765MHz < 2.5 μW/MHz 
≦ 20MHz 
(others) ≦ 5470MHz  12.5 μW/MHz 
5730MHz ≦ 12.5 μW/MHz 
20MHz to 
40MHz ≦ 5460MHz 12.5 μW/MHz 
5460MHz - 5470MHz 50 μW/MHz 
5770MHz ≦ 12.5 μW/MHz 
40MHz to 
80MHz ≦ 5460MHz 12.5 μW/MHz 
5460MHz - 5469.5MHz 50 μW/MHz 
5469.5MHz - 5470MHz 51.2 μW/MHz 
5770MHz ≦ 12.5 μW/MHz 
80MHz to 
160MHz ≦ 5419.6MHz 12.5 μW/MHz 
5419.6MHz - 5470MHz 50 μW/MHz 
5725MHz ≦ 12.5 μW/MHz  
5250MHz - 5251MHz 101+log(5)-(f-9)mW/MHz 
5251MHz - 5260MHz 10-1+log(5)-(8/90)(f-11)mW/MHz 
5260MHz - 5266.7MHz 10-1.8+log(5)-(6/50)(f-20)mW/MHz 
5266.7MHz ≦ 12.5μW/MHz 
18MHz to 
20MHz 5180MHz ≦ 5142MHz 12.5μW/MHz 
5142MHz - 5150MHz 75μW/MHz 
5240MHz 5250MHz – 5250.2MHz 101+log(5)-(8/3)(f-9.75) mW 
5250.2MHz - 5251MHz 101+log(5)-(f-9)mW/MHz 
5251MHz - 5260MHz 10-1+log(5)-(8/90)(f-11)mW/MHz 
5260MHz - 5266.7MHz 10-1.8+log(5)-(6/50)(f-20)mW/MHz 
5266.7MHz ≦ 12.5μW/MHz 
20MHz to 
40MHz 5190MHz ≦ 5141.6MHz 12.5μW/MHz 
5141.6MHz - 5150MHz 75μW/MHz 
5230MHz 5250MHz - 5251MHz 10log(5)-(f-20)+log(1/2)mW/MHz 
5251MHz - 5270MHz 10log(5)-(8/190)(f-21)-1+log(1/2)mW/M
Hz 
5270MHz - 5278.4MHz 10log(5)-(3/50)(f-40)-1.8+log(1/2)mW/
MHz 
5278.4MHz ≦ 12.5μW/MHz 
40MHz to 
80MHz 5210MHz ≦ 5123.2MHz 12.5μW/MHz 
5123.2MHz - 5150MHz 75μW/MHz 
5250MHz - 5251MHz 10log(5)-(f-40)+log(1/4)mW/MHz 
5251MHz - 5290MHz 10log(5)-(8/390)(f-41)-1+log(1/4)mW/M
Hz 
5290MHz - 5296.7MHz 10log(5)-(3/100)(f-80)-1.8+log(1/4)mW/
MHz 
5296.7MHz ≦ 12.5μW/MHz 
' f ' is the separation from the carrier frequency. (unit : MHz) 
 
(unlicensed 6GHz WLAN system (LPI))  
OBW reference 
channel applied frequency 
region Allowable unwanted emission 
level 
(EIRP) 
≦ 20MHz 5955MHz ≦ 5925MHz 2 μW/MHz 
6415MHz 6425MHz - 6435.9MHz 10 μW/MHz 
6435.9MHz ≦ 2.5 μW/MHz 
20MHz to 
40MHz 5965MHz ≦ 5925MHz 2 μW/MHz 
6405MHz 6425MHz – 6440.1MHz 50 μW/MHz 
6440.1MHz ≦ 12.5 μW/MHz 
40MHz to 
80MHz 5925MHz ≦ 5925MHz 2 μW/MHz 
6385MHz 6425MHz – 6440.4MHz 50 μW/MHz 
6440.4MHz ≦ 12.5 μW/MHz 
80MHz to 
160MHz 6025MHz ≦ 5925MHz 2 μW/MHz 
6345MHz 6425MHz – 6425.5MHz 50 μW/MHz 
6425.5MHz ≦ 12.5 μW/MHz 
 
(unlicensed 6GHz WLAN system (VLP))  
OBW reference 
channel applied frequency 
region Allowable unwanted emission 
level 
(EIRP) 
≦ 20MHz 5955MHz ≦ 5925MHz 0.2 μW/MHz 
6415MHz 6425MHz - 6425.5MHz 50 μW/MHz 
6425.5MHz ≦ 12.5 μW/MHz 
20MHz to 
40MHz 5965MHz ≦ 5925MHz 0.2 μW/MHz 
6405MHz 6425MHz – 6425.4MHz 50 μW/MHz  
6425.4MHz ≦ 12.5 μW/MHz 
40MHz to 
80MHz 5925MHz ≦ 5925MHz 0.2 μW/MHz 
6385MHz 6425MHz – 6425.2MHz 50 μW/MHz 
6425.2MHz ≦ 12.5 μW/MHz 
80MHz to 
160MHz 6025MHz ≦ 5925MHz 0.2 μW/MHz 
6345MHz 6425MHz – 6425.1MHz 50 μW/MHz 
6425.1MHz ≦ 12.5 μW/MHz 
  
Leak radiation 
from receiver 
circuit At the frequency region  
   less than 1GHz：4nW 
   more than 1GHz：20nW 
Usage condition ・2.4GHz WLAN system：none 
・5.2GHz WLAN system：indoor use only(*), except connecting to 5.2GHz 
High-power WLAN system (Fixed-AP) 
・5.3GHz WLAN system：indoor use only(*) 
・5.6GHz WLAN system：do not use in the sky (except using in an airplane) 
・5.2GHz High-power WLAN system：Fixed-AP 
・6GHz WLAN system (LPI)：indoor use only(*) 
・6GHz WLAN system (VLP)：do not use in the sky 
(*) Indoor includes trains, boats, and aircraft exceptionally includes cars in 
the 5.15 – 5.25 GHz band. 
License ・2.4/5.2/5.3/5.6/6GHz WLAN system：unlicensed system 
・5.2GHz High-power WLAN system：registered system 
 
５ Proposed date of entry into force 
August, 2022