The O utline of Proposed Amendment to  Ministerial O rdinance  
 
1. Item 
Partial  amendment of Regulations for Radio Equipment  
 
2. Amendment to ministerial ordinance  
Ordinance Regulati ng Radio Equipment  [Partial amendment]  
 
3. Reason s for amendment  
In July, 2012, it will  become possible in Japan for intelligent transport systems (ITS) 
to utilize frequencies (700MHz bands) freed up due to the digitalization of terrestrial 
television broadcasting. In order to introduce ITS wireless systems using  700 MHz 
bands, the technical  regulations on driving safety support system using 700 MHz 
bands are established.  
 
4. Outline of the amendment  
Technical regulation s on driving safety support system s using  700MHz bands are 
established as follows:   
 
 
General requirements  
Communication meth od Communication method  shall be broadcast communication, 
one-way communication or simplex operation.  
Frequency band  755.5MHz < f <= 764.5MHz  
 
Technical requirements for radio equipment  
Antenna power  The antenna power shall provide a mean power within a  
bandwidth of 1,000kHz of 10mW or less.  
Tolerance of antenna power  The tolerance of a ntenna power shall be within the range of +20% 
and -50%.(base station)  
The tolerance of a ntenna power shall be within the range of +50% 
and -50%.(mobile station)  Toleran ce of frequency  The tolerance of  the  frequency  shall be ±20×10-6(base station 
and mobile station) 
Modulation method  Modulation method shall be o rthogonal frequency division 
multiplexing . 
Permissible value s for 
occupied bandwidth  9MHz or less  
Transmissi on rate  Transmission rate shall be 5Mb ps or more.  
 
Permissible value s for 
unwanted emission  intensity  Type of radio 
station  Frequency band  Limit on Secondary 
Emission  
Base 
station  f <=710MHz  Average  power shall be 2.5 
μW or less in any 100kHz 
band.  
710MHz<f<=750MHz  Average  power shall be 20 
nW or less  in any 100kHz 
band.  
750MHz<f<=755MHz  Average  power shall be 
100μW or less in any 
100kHz band.  
765MHz<f<=770MHz  Average  power shall be 
100μW or less in any 
100kHz band.  
770MHz<f<=810MHz  Average  power shall be 
320pW or less in any 
100kHz band.  
810MHz<f<=1GHz  Average  power shall be 
2.5μW or less in any 
100kHz band.  
1GHz<f  Average  power shall be 
2.5μW or less  in any 
1MHz band.  Land mobile 
station  f<=710MHz  Average  power shall be 
2.5μW or less  in any 
100kHz band.  
710MHz<f<=750MHz  Average  power shall be 
20nW or less in any 
100kHz band.  
750MHz<f<=755MHz  Average  power shall be 
100μW or less in any 
100kHz band.  
765MHz<f<=770MHz  Average  power shall be 
100μW or less in any 
100kHz band.  
770MHz<f<=810MHz  Average  power shall be 
10nW or less in any 
100kHz band.  
810MHz<f<=1GHz  Average  power shall be 
2.5μW or less in any 
100kHz band.  
1GHz<f  Average  power shall be 
2.5μW or less in any 
1MHz band.  
Limit on secondary  
emission , etc.  Station  Frequency band  Limit on secondary  
emission  
Base station  f<=770MHz  Average  power shall be 
4nW or less in any 100kHz 
band.  
770MHz<f<=810MHz  Average  power shall be 
320pW or less in any 
100kHz band.  
810MHz<f<=1,000MHz  Average  power shall be 
4nW or less in any 100kHz 
band.  1,000MHz<f  Average  power shall be 
4nW or less in any 1MHz 
band.  
land mobile 
station  
 
 f<=1,000MHz  Average  power shall be 
4nW or less in any 100kHz 
band.  
1,000MHz<f  Average  power shall be 
4nW or less in any 1MHz 
band.  
 
 
Controller  
Interference prevention 
function  The radio equipment shall automatically transmit  and receive 
identification sign. 
Identification sign  48 bits or more  
Carrier sens ing devic e In case of the power at a terminal of antenna  is -53dBm  or more , 
the radio wave shall not be emitted. (mobile station)  
Transmission time control  Summation  of transmission time shall be 10.5ms or less  in any  
100ms (base station) . 
Summation  of transmission  time shall be 0.66ms or less in any 
100ms and each transmission tim e shall be  0.33ms or less (land 
mobile station) .  
 
Antenna   
Antenna gain  The absolute gain of transmission antenna shall be 0dB or less.  
However, w hen the equivalent isotropically radiated power is less 
than the value which 10mW average  transmission  powe r (average 
power is 10mW in 1MHz) is added to transmission antenna whose 
absolute gain is 0dB, it can be compensated for shortfall up to 13dB(base station).  
When equivalent isotropically radiated power is smaller than 
value which 10mW average  transmission  power (average power is 
10mW in 1MHz) is added to transmission antenna whose absolute 
gain is 0dB, it can be compensated for shortfall up to 5dB(mobile  
station).  
 
 
5. Proposed dat e of entry into force  
14th December,  2011