The O utline of Proposed Amendment to  Ministerial O rdinance  
 
１ Item 
Partial  revision of Regulations for Radio Equipment  
 
２ Amendment to ministerial ordinance  
Regulations for Radio Equipment  
 
３ Reason s for amendment  
Considering the situation that the traffi c of the mobile communications is increasing 
every year , it is necessary to make easy connection  of Wireless LAN  in Japan . To meet 
these demands , we arrange the technical standards of the Wireless LAN Sys tem for 
the expansion of use of the 5.2GHz band.   
 
４ Outline of the amendment  
Technical requirements of radio equipment  
Item  
Name  Wireless LAN System  (5.2GHz ) 
Frequency band  5150MHz  to 5250MHz  
・20MHz system : 5180MHz, 5200MHz, 5220MHz and 5240MHz  
・40MHz system : 5190MHz, 5230MHz  
・80MHz system : 5210MHz  
 
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 ・20MHz system : more than 20 Mbps  
・40MH z system : more than 40 Mbps  
・80MHz system : more than 80 Mbps  
OBW  ・20MHz system : 19 MHz (OFDM), 18 MHz (other modulations)  
・40MHz system : 38 MHz  
・80MHz system : 78 MHz  
Allowable 
deviation of ±20×10-6  
frequency  
Antenna Power  OFDM  
・20MHz system : 10 mW /MHz  
・40MHz system : 5 mW/MHz  
・80MHz system : 2.5 mW/MHz  
DS-SS: 1 0 mW/MHz  
other modulations: 10mW  
EIRP  License system  (Fixed -AP) 
 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 
 
Un-license system  (STA)  
・20MHz system : 10 mW/MHz  
・40MHz system : 5 mW/MHz  
・80MHz system : 2.5 mW/MHz  
 
Allowable 
deviation of 
Antenna Power  -80 to +20% 
Spectrum Mask 
(1) OBW  applied frequency region  Allowable 
unwanted 
emission level  
less than 
18MHz  less than 5140MHz  
and 
more than 5360MHz  
less than 2.5μW 
(aver age power) 
at any 1MHz 
band  18MHz to 
19MHz  less than 5135MHz  
and 
more than 5365MHz  
19MHz to 
38MHz  less than 5100MHz  
and 
more than 5400MHz  
38MHz to less than 5020MHz   
78MHz  and  
more than 5480MHz  
 
Spectrum Mask 
(2) OBW is less than 18MHz：Average powe rs within the ± 9MHz region s 
of 20M Hz and 40MHz separation s from the 
carrier frequency  are respectively 25dB and 
40dB less than the average power of the 
carrier frequency.  
OBW is 18MHz to 19MHz ：Average powers within the ± 9.5MHz 
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 19MHz to 38MHz ：Average powers within the ± 19MHz 
regions of 40MHz and 80MHz separations  
from the carrier frequency are respec tively 
25dB and 40dB less than the average power 
of the carrier frequency.  
OBW is 38MHz to 78 MHz：Average power within the ± 39MHz region 
of 80MHz separation  from the carrier 
frequency are 25dB less than the average 
power of the carrier frequency.  
 
 
Spectr um Mask 
(3) License system (Fixed -AP) 
OBW  reference 
channel  applied frequency 
region  Allowable unwanted 
emission level  
(EIRP)  
< 18MHz  5240MHz  5140MHz - 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 - 5360MHz  12.5μW/MHz  
18MHz to 
19MHz  5180MHz  5135MHz - 5142MHz  12.5μW/MHz  
5142MHz - 5150MHz  75μW/MHz  
5240MHz  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 - 5365MHz  12.5μW/MHz  
19MHz to 
38MHz  5190MHz  5100MHz - 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/
MHz   
5270MHz - 5278.4MHz  10log(5) -(3/50)(f -40)-1.8+log(1/2)mW
/MHz  
5278.4MHz - 5400MHz  12.5μW/MHz  
38MHz to 
78MHz  5210MHz  5020MHz - 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/
MHz  
5290MHz - 5296.7MHz  10log(5) -(3/100)(f -80)-1.8+log(1/4)m
W/MHz  
5296.7MHz - 5480MHz  12.5μW/MHz  
' f ' is the separation from the carrier frequency. (unit : MHz)  
 
Un-license system (STA)  
OBW  reference 
channel  applied frequency 
region  Allowable unwanted emission 
level  
(EIRP)  
< 18MHz  5240MHz  5140MHz - 5142MHz  2.5μW/MHz  
5142MHz - 5150MHz  15μW/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 - 5360MHz  2.5μW/MHz  
18MHz to 
19MHz  5180MHz  5135MHz - 5142MHz  2.5μW/MHz  
5142MHz - 5150MHz  15μW/MHz  
5240MHz  5250MHz - 5251 MHz  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 - 5365MHz  2.5μW/MHz  
19MHz to 
38MHz  5190MHz  5100MHz - 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 - 5400MHz  2.5μW/MHz  
38MHz to 
78MHz  5210MHz  5020MHz - 5123.2MHz  2.5μW/MHz  
5123.2MHz - 5150MHz  15μW/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  2.5μW/MHz  
' f ' is the separation from the carrier frequency. (uni t : MHz)  
 
Leak radiation 
from receiver 
circuit  At the frequency region  
   less than 1GHz：4nW  
   more than 1GHz：20nW  
 
５ Proposed dat e of entry into force  
around June or July 2018