stds-802-16-tg4: [802Regs/Coex] 5GHz Coexistence
Marianna, all,
Ok, since I have the new coexistence study group, I'll jump in on this one.
I think we in IEEE need to differentiate between what the regulations will
allow and what the IEEE should advocate as "Recommended Practice".
Certainly, ETSI and others have been relatively specific what types of
systems are allowed in a band, but the US FCC tends to be less restrictive,
and I think will become less so over time. So I would not expect the FCC to
ever say that fixed wireless access will only be in band X and WLAN will
only be in band Y. It seems to me the IEEE should recommend that (for
example) WLAN at 5GHz should use DFS preferring the 5.15 band at low power,
and FWA should use DFS starting in the 5.75 band, allowing higher power.
While I realize such a proposal isn't exactly consistent with current ETSI
definitions of DFS, hopefully you get the idea - it's consistent with your
thoughts. We should come to consensus within IEEE of how to minimize
interference to avoid having a very public debate in front of the FCC, ETSI,
or worse yet, the WRC.
So my summary: we should agree on how we plan to coexist, then lobby from a
united front for the regulatory changes that will enable that coexistence.
802.15 has done this same process (in a less organized fashion) for
802.11-Bluetooth coexistence; we have agreed that adaptive hopping for BT is
a good idea, and now we must use the NPRM process to get there.
I'll try to call into the next regulatory conf call as well....
Best regards,
Jim
Jim Lansford, Ph.D.
VP, Business Development
Mobilian Corporation
Chair, IEEE 802 Coexistence Study Group
Phone: +1 405 377 6170
Fax: +1 425 671 6099
Mobile: +1 405 747 5229
SMS: 4057475229@mobile.att.net
jim.lansford@mobilian.com
www.mobilian.com
-----Original Message-----
From: owner-stds-802-16-tg4@majordomo.ieee.org
[mailto:owner-stds-802-16-tg4@majordomo.ieee.org]On Behalf Of Marianna
Goldhammer
Sent: Tuesday, June 12, 2001 12:01 PM
To: David Chauncey
Cc: j.carlo@ieee.org; Roger B. Marks; stds-802-16-tg4@ieee.org;
reflector 802.regs
Subject: RE: stds-802-16-tg4: Re: 5GHz Fixed Wireless Access in danger!
David,
I think that before working on NPRM,
we should have an agreed 802 strategy regarding the 5GHz band splitting
between different working groups. I see the UNII FCC regulations as a good
base for doing that, based on the limitations of the transmitted power.
The 802.16 interests are related to high level transmitted power, the 802.11
and 802.15 want to limit it at lower level.
It is clear that in the near future FCC will unify ISM and UNII regulations
in 5GHz, so we should already consider this consolidation and have an
agreement based on BW splitting. This will not preclude the lower power
systems to work in the higher bands, for example indoor . Nevertheless,
the focus of the higher bands should be the Fixed Wireless Access.
I would like to see in that band more waivers for P-MP, sectorized
antenna systems.
Lets discuss this in the next teleconference. I will be happy to join.
Please send me the bridge number.
Marianna
-----Original Message-----
From: David Chauncey [mailto:Dchauncey@Clearwire.com]
Sent: Tuesday, June 12, 2001 2:52 PM
To: Marianna Goldhammer; Roger B. Marks; stds-802-16-tg4@ieee.org
Cc: Hayes, Vic
Subject: RE: stds-802-16-tg4: Re: 5GHz Fixed Wireless Access in danger!
Marianna,
There will be another conference call to discuss this NPRM on June 22, 2001,
7-9 AM PDT. We can discuss the issues with Vic at that time.
Regards,
David
David C. Chauncey
Clearwire Technologies Inc.
PO Box 850
Cheektowaga, NY 14225-0850
Voice: (716) 631-6409
Fax: (716) 631-6080
dchauncey@clearwire.com
http://www.clearwire.com
-----Original Message-----
From: owner-stds-802-16-tg4@majordomo.ieee.org
[mailto:owner-stds-802-16-tg4@majordomo.ieee.org] On Behalf Of Marianna
Goldhammer
Sent: Monday, June 11, 2001 5:53 PM
To: Roger B. Marks; stds-802-16-tg4@ieee.org
Cc: Hayes, Vic
Subject: RE: stds-802-16-tg4: Re: 5GHz Fixed Wireless Access in
danger!
Dear Roger,
For clarification, the FCC notice 01-158, makes no distinction
between indoor/outdoor installations. OFDM falls in the class of
"digital modulation system".
All the systems in 5GHz ISM band are "1Watt", for more than 700KHz BW
direct sequence, in case of the old rules.
My interpretation of the text in the teleconf is:
- digital modulation systems are limited to a power density
under 10dBm/MHz and a transmitted power under 100mW;
- outdoor and P-P systems are allowed to transmit 1W, according
to the old rules, meaning no more than 8dBm/3kHz, while keeping
the processing gain rule - being DIRECT SEQUENCE
(not OFDM!) systems.
I will be the first to be happy if my interpretation was wrong.
Marianna
Marianna Goldhammer
Director - Strategic Technologies
BreezeCOM Ltd.
21 HaBarzel Street
P.O.Box 13139, Tel Aviv 61131, Israel
Tel: (972)- 3 -6456241/6262
Fax: (972) -3 -6456290
Email: mariannag@breezecom.co.il
http://www.breezecom.com