1. March 2003
MMAC T71 Ad hoc WG Report
Yasuhiko Inoue, NTT
Y.Inoue, NTT

2. March 2003
MMAC Overview
MMAC (Multimedia Mobile Access Communication Systems Promotion Council)
An organization in the ARIB (Association of Radio Industries and Businesses).
Activities:
Investigation and study on system specifications
Demonstrative experiment
Information exchange and popularization activities, etc
Working Groups
High Speed Wireless Access
5GHz Mobile Access (Wireless Access and Wireless LAN)
Wireless Home-Link (Wireless 1394)
Y.Inoue, NTT

3. T71 Ad hoc Working Group ARIB STD-T71
March 2003
T71 Ad hoc Working Group
ARIB STD-T71
Technical requirements and specifications for IEEE a systems to operate in Japan.
T71 Ad hoc WG has been created to revise the current ARIB STD-T71 to incorporate the technical requirements for 5GHz Band Wireless Access systems.
Chief: Mr. Noboru Matsumoto, SpeedNet
Member companies:
Atheros, Canon, Denso, Fujitsu, Hitach Cable, Intel, Japan Telecom, JRC, Mitsubishi, Murata, NEC, NTT, TOYOCOM, Panasonic, Samsung, SpeedNet, TDK, Toshiba, TTNet, and more
Supposed to finish its work by the end of March
Y.Inoue, NTT

4. Activities T71 Ad hoc WG had two meetings Jan. 23: The 1st meeting
March 2003
Activities
T71 Ad hoc WG had two meetings
Jan. 23: The 1st meeting
Call for members of the drafting group.
Reviewed current ARIB STD-T71 to find the sections to be modified.
Feb. 25: The 2nd meeting
The initial version of the draft was presented to the WG members.
Discussions:
Clarification for some texts (e.g. spurious emissions)
Channel numbering scheme, etc
Mar. 19: The 3rd meeting
Activities in IEEE TGj was reported.
Y.Inoue, NTT

5. Major Topics Regulatory requirements include: Additional specification
March 2003
Major Topics
Regulatory requirements include:
Frequency band and channelization: GHz, GHz
Transmit power: 250 [mW] or 10 [mW/MHz]
Spectrum mask
In-band and out-of-band spurious emission
Antenna gain
Carrier sense level
Additional specification
Channel numbering: the same expression as the IEEE j D1.0
Details are summarized in 02/533r1
Y.Inoue, NTT

6. Channel Numbering Scheme
March 2003
Channel Numbering Scheme
4.9 – 5.0GHz:
MMAC T71 Ad hoc WG accepted the channel numbering scheme proposed in TGj
4000
5000
4900
MHz
436
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
New Definition
Y.Inoue, NTT

7. Requirement of the Market
March 2003
Requirement of the Market
Article of Radio Equipment Ordinance allows three kinds of systems for the channel bandwidth
20MHz:
A commercial license has been given to a service provider.
Many other service providers plan to start their services.
10MHz:
Some ISP plan to provide FWA/NWA services.
5MHz:
No requirements from the market
Is it really necessary to standardize this system?
Y.Inoue, NTT

8. March 2003
Schedule
T71 Ad hoc WG had some discussions by after the final meeting.
All of the modifications are incorporated into the draft.
May/9: The final version of the draft.
June/5: ARIB Standards Assembly.
The draft will be approved as ARIB STD-T71 ver.2.
Y.Inoue, NTT

9. March 2003
Future Works
MMAC T71 Ad hoc WG continues to revise the ARIB STD-T71 if necessary
Issues to be addressed:
Specification of the 10MHz system
Harmonization with IEEE j
Y.Inoue, NTT

10. Summary The MMAC T71 Ad hoc WG: ARIB:
March 2003
Summary
The MMAC T71 Ad hoc WG:
Final draft for the ARIB STD-T71 ver.2 is ready.
WG will continue its activity for further revisions.
ARIB:
June/5 Standard assembly will approve the draft as ARIB STD-T71 version 2
STD-T71 ver.2 will be published soon.
Y.Inoue, NTT