1 
 The Outline of Proposed Amendment to Ministerial Ordinance 
 
１ Item 
Partial revision of Regulations for Radio Equipment 
 
２ Amendment to ministerial ordinance 
Regulations for Radio Equipment 
 
３ Reasons for amendment 
Japan needs to improve efficiency of Wireless LAN (WLAN) connections, considering 
the current increased traffic of the mobile communications in Japan. To meet these 
demands, Japan will arrange the technical regulations of the WLAN System for the 
expansion of use the WLAN system with IEEE 802.11ax support. 
 
４ Outline of the amendment 
Technical requirements of radio equipment 
(The following items written in red indicate are points to change.) 
Item Description 
Name Wireless LAN (WLAN) System (2.4/5.2/5.3/5.6GHz bands) 
Frequency band 2400MHz to 2483.5MHz 
5150MHz to 5250MHz 
5250MHz to 5350MHz 
5470MHz to 5730MHz 
Communication 
Systems  Unidirectional, Simplex, Half-Duplex and Duplex 
Modulation Frequency-Hopping (FH), Direct Sequence Spread Spectrum (DS-SS), 
Amplitude Modulation, Phase Modulation, Frequency Modulation, Pulse 
Modulation or these combination, and Orthogonal Frequency Division 
Multiplexing (OFDM) 
Maximum 
bitrate (5150MHz to 5350MHz and 5470MHz to 5730MHz) 
・20MHz system : more than 20Mbps  
・40MHz system : more than 40Mbps 
・80MHz system : more than 80Mbps 
・160MHz system : more than 160Mbps 
   
2 
 Occupied Band 
Width (OBW) (2400MHz to 2483.5MHz) 
・20MHz system : 26MHz 
・40MHz system : 40MHz 
(5150MHz to 5350MHz and 5470MHz to 5730MHz) 
・20MHz system : 20MHz (OFDM), 18 MHz (other modulations) 
・40MHz system : 40MHz 
・80MHz system : 80MHz 
・160MHz system : 160MHz 
Allowable 
deviation of 
frequency ・2400MHz to 2483.5MHz：±50×10-6 
・5150MHz to 5350MHz and 5470MHz to 5730MHz：±20×10-6 
Antenna Power 
 Frequency band Modulations Antenna Power 
2400MHz 
to 
2483.5MHz Frequency-Hopping (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 
or 
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 
 
Equivalent 
Isotropically 
Radiated Power 
(EIRP) 
 (unlicensed 5.2/5.3/5.6GHz WLAN system)  
Frequency band OBW EIRP 
5150MHz 
to 
5250MHz 20MHz system 10 mW/MHz 
40MHz system 5 mW/MHz 
80MHz system 2.5 mW/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) 
(registered 5.2GHz High-power WLAN system)  
OBW elevation angle θ (degree) Maximum 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  
3 
 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)   -80% to +20% 
(others)   -50% to +50% 
Spectrum Mask 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. 
  
4 
 Unwanted 
Emission Levels (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)  
5 
  
(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 
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) 
 
Leak radiation 
from receiver 
circuit At the frequency region  
   less than 1GHz：4nW 
   no less 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 
License ・2.4/5.2/5.3/5.6GHz WLAN system：unlicensed system 
・5.2GHz High-power WLAN system：registered system 
  
6 
  
５ Proposed date of entry into force 
Around June or July, 2019