DATATrak News - 2007

November 2007  
 -
IEEE802.11j 4900 - 5000MHz Wireless Access System

  The MIC has announced a 5 years extension for the allocation of the 5030-5091MHz bandwidth for Wireless Access System use, until November 2012.

 - New spurious requirements
  As announced in our December 2005 News Section, the grace period for the new spurious requirements ends this month. New RF equipment submitted for RF certification in Japan now has to comply with the new spurious limits and measurement methods.

  Feel free to contact us for more information !


August 2007  
 
Wimax and Mobile Wimax certification in Japan

Currently In Japan, and since August 1st 2008, the 2.5GHz band is allowed for WiMax communication. (No date is set yet for other frequency bands, which are already allocated to weather radars or other communication interfaces.)

The use of the 2,5GHz band requires an equipment certification (type or per-product) from a telecommunication certification CAB, as well as an operation  license from the Ministry.

Product Classification in the Rdaio Law Certification Regulations (Shoumei Kisoku)
- Art2-1-49: OFDMA wideband mobile wireless access base station
- Art2-1-50: OFDMA-W wideband mobile wireless access base station
- Art2-1-51: OFDMA wideband mobile wireless access land mobile station
- Art2-1-52: OFDMA-W wideband mobile wireless access land mobile station
- Art2-1-53: TD-OFDMA wideband mobile wireless access base station
- Art2-1-54: TD-OFDMA wideband mobile wireless access base station
- Art2-1-55: TD-FDMA wideband mobile wireless access land mobile station
- Art2-1-56: TD-FDMA wideband mobile wireless access land mobile station

Test reference for Wimax products : TELEC T-136 and T-137 (August 2007)

However, as of today, there is still no carrier servicing WiMax, and therefore it is not possible to obtain a license.

  Feel free to contact us for more information !


July 2007 - Revision of the Technical Requirements for IEEE802.11n compliant 40MHz bandwidth Radio equipment

 The MIC (Japanese Ministry of Internal Affairs and Communications) has revised the Technical requirements for wireless LAN equipment, in order to cover IEEE802.11n (MIMO type) compliant equipment in the 2.4 and 5GHz bandwidths, and the updated requirements (in red) are summarized in the table below.

 Source (MIC - Japanese) : 
   http://www.soumu.go.jp/s-news/2007/pdf/070207_8_bs1.pdf

Freq. BW

2.4GHz

4.9 – 5.0

GHz

5.03 – 5.091

GHz

5.15 – 5.25

GHz

5.25 – 5.35

GHz

5.47 – 5.725

GHz

Location

In/outdoor

(including onboard flight)

In/outdoor

(excluding onboard flight)

Indoor

(including onboard flight)

Indoor

(including onboard flight)

In/outdoor

(including onboard flight)

Ch spacing

N/S

5/10/20MHz 40MHz

5/10/20MHz

20MHz
40MHz

Mod. method

20MHz

N/S

OFDM method, DS method, Single carrier method

40MHz

OFDM method

N/A

OFDM method

Max ant. power

20MHz

FH: 3mW/MHz OFDM/DS: 10mW/MHz

250mW and 50mW/MHz

OFDM, DS: 10mW/MHz
Single carrier: 10mW

40MHz

5mW/MHz

250mW and 25mW/MHz

N/A

5mW/MHz

Max. ant. gain

12.14dBi

13dBi

N/S

Max. EIRP

20MHz

Not specified

10mW/MHz

50mW/MHz

40MHz

5mW/MHz

25mW/MHz

Carrier Sensing

20MHz

N/S

Required

40MHz

Required

N/A

Required

DFS, TPC

Not required

Required
(master station only)

Connection type

At discretion

Master – Slave
(relay possible)

At discretion

At discretion (slave stations not controlled by master stations are not authorized)

@ @ @ @ @ @ @ @ @

N/S = Not Specified

N/A = Not Applicable

Feel free to contact us for more information !

@

February 2007 - More information about High Speed PLC equipment in Japan

   With the revision of the Radio Law, back in  October 4th, 2006, high speed PLC (Power Line Communication) equipment can now be used in Japan.

 To the authorized 10kHz – 450kHz frequency range for the power line carrier wave prior to the revision of the law, was added the new frequency range: 2MHz – 30MHz for indoor use.

 PLC equipment are categorized as gEquipment using high frequenciesh in Japan, and require conformance certification in order to be operated in Japan.

 There are basically two processes, depending on the characteristics of PLC equipment

 1 – Certification to the Telecommunications Business Law, (type certification) with the submission of a compliant test report and application to an appointed CAB, such as JATE. (This process may only apply if equipment is equipped with a wireline trunk interface, WAN, PSTN, Etc.) Please refer to the wireline certification process, or contact us for more information.

 2 – Certification to the Radio Law, Article 100, (type certification) as gequipment using high frequenciesh. This certification is rather an gauthorization of useh, granted by the Ministry of Internal Affairs and Communications (hereinafter referred to as MIC) to PLC equipment successfully tested.

Tested items are:
- Electrical current sent to the power line by the equipment during communication.
- Electrical Voltage sent to the power line by the equipment when idle.
- Electric field strength of the radiated spurious during communication.

Applications have to be submitted to the local branch of MIC and depends on the address of the applicant.

Summary of the current technical requirements for 2MHz to 30MHz wideband Power Line Communication equipment (Radio Equipment Regulations) 

 (Please note that technical requirements for the older 10kHz to 450kHz PLC equipment are omitted.)

 Frequency Range
   2MHz to 30MHz for indoor use. If the carrier wave is modulated using a spread spectrum method, the spread frequencies must remain within 2MHz and 30MHz.

   Interference Current during communication

Frequency

Allowance (1uA = 0dB)

Quasi-peak value

Average value

Over 150kHz and less than 500kHz

36 – 26dBuA

26 – 16dBuA

Over 500kHz and less than 2MHz

26dBuA

16dBuA

Over 2MHz and less than 15MHz

30dBuA

20dBuA

Over 15MHz and less than 30MHz

20dBuA

10dBuA

   Interference Voltage when not communicating

Frequency

Allowance (1uV = 0dB)

Quasi-peak value

Average value

Over 150kHz and less than 500kHz

66 – 56dBuV

56 – 46dBuV

Over 500kHz and less than 5MHz

56dBuV

46dBuV

Over 5MHz and less than 30MHz

60dBuV

50dBuV

   Radiated Interference

Frequency

Allowance (1uV/m = 0dB)

Over 30MHz and less than 230MHz

30dBuV/m

Over 230Hz and less than 1,000MHz

37dBuV/m

Precise test configurations are stipulated in the gRadio Law Enforcement Regulationsh

Feel free to contact us for more information.

New Frequencies allocated for low-power WLAN in the 5.6GHz band

   On January 31st, 2007, the Radio law was amended to allocate new frequencies in the 5.6GHz bandwidth for Low-power WLAN equipment.

   The new frequencies are: 5,500MHz, 5,520MHz, 5,540MHz, 5,560MHz, 5,580MHz, 5,600MHz, 5,620MHz, 5,640MHz, 5,660MHz, 5,680MHz, and 5,700MHz.

   The main requirements will be updated soon.

  Feel free to contact us for more information !


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