| Thread Links | Date Links | ||||
|---|---|---|---|---|---|
| Thread Prev | Thread Next | Thread Index | Date Prev | Date Next | Date Index |
There has been a suggestion to ban 40 MHz 802.11n operation in the 2.4 GHz band because of coexistence issues between Wi-Fi and Bluetooth. Intel is seriously concerned with this suggestion. We believe that this is counter to the intent of standardization and product development in the unlicensed band. The 40 MHz Wi-Fi operation is already being used in 10s of millions of products that are enabling exciting and new usage models for Wi-Fi. The operations of these devices are clearly within FCC part 15 rules. The standard has provisioned coexistence mechanisms that ensure proper coexistence between the different technologies. It is irresponsible to suggest that the existing mechanisms are not generally effective without any data to back up the assertions. Most companies shipping Wi-Fi modules have Bluetooth on the same platforms and have gone a long way to ensure that there is coexistence in their solutions. IEEE was not created to “ban” standards but to develop them. This suggestion will have a serious business impact on the industry and will open the door to stifling innovation. We look forward to working in the standards to further improve coexistence between the different technologies but strongly disagree with the concept of “banning” standards.
Regards,
Eldad
From: Shellhammer, Steve [mailto:sshellha@QUALCOMM.COM]
Sent: Sunday, May 25, 2008 11:38 AM
To: STDS-802-19@LISTSERV.IEEE.ORG
Subject: Re: [802.19] [802.15_GENERAL] TGn Letter Ballot Support
IEEE 802.19 TAG,
Paul Nikolich would like the opinion of the 802.19 members on the 40 MHz 802.11n discussion.
If you have an opinion to share please “reply-all” so that everyone can hear your opinion.
Regards,
Steve
From: Paul Nikolich [mailto:paul.nikolich@att.net]
Sent: Saturday, May 24, 2008 7:06 AM
To: Shellhammer, Steve
Subject: Fw: [802.15_GENERAL] TGn Letter Ballot Support
Steve,
What is dot19's opinion on the below debate?
--Paul
----- Original Message -----
From: Matthew Fischer <mailto:mfischer@BROADCOM.COM>
To: STDS-802-WPAN@LISTSERV.IEEE.ORG
Sent: Friday, May 23, 2008 10:29 PM
Subject: Re: [802.15_GENERAL] TGn Letter Ballot Support
I will be voting YES on TGn LB129, and I would urge others who are interested in defending 802.15.x devices' access to the ISMii band to vote YES as well.
The current draft of the 802.11 TGn amendment contains normative language describing a mechanism (i.e. the 40 MHz Intolerant bit) that allows non-related devices to signal to the 40 MHz TGn devices that they cannot send 40 MHz transmissions, effectively allowing other users of the ISMii band to restrict the use of 40 MHz transmissions by TGn devices. 40 MHz 802.11 TGn devices are required to obey this signaling whenever it occurs.
If 40 MHz operation is forbidden in ISMii by 802.11 TGn, then 40 MHz operation will be implemented as a set of vendor-specific non-standardized modes with variable degrees of good citizenship regarding spectrum sharing and with little or no opportunity for such devices to be controled by other users of the ISMii band.
For these reasons, it is in the best interest of 802.15.x technology providers and other users of the ISMii band to vote YES on the TGn-standardized mode of 40 MHz operation that includes specific requirements to force TGn devices to cease 40 MHz operation when requested.
Matthew Fischer
Nice Guy
+1 408 543 3370 office
+1 650 796 9206 mobile
mfischer@broadcom.com <mailto:mfischer@broadcom.com>
From: John Barr [mailto:john.barr@MOTOROLA.COM]
Sent: Friday, May 23, 2008 8:36 AM
To: STDS-802-WPAN@LISTSERV.IEEE.ORG
Subject: [802.15_GENERAL] TGn Letter Ballot Support
As mentioned in Jacksonville, the current draft of TGn includes use of 40 MHz channels in 2.4 GHz spectrum. This will significantly impair ability of other IEEE standards using 2.4 GHz spectrum to coexist with TGn devices running at 40 MHz. Even though the rejection of my comment number 6069 states that there is provision for coexistence with other radio systems using 2.4 GHz spectrum, the actual text for this is informative and does not actually include tests for IEEE 802.15.1 nor IEEE 802.15.4 devices. See attached note to TGn I sent during the Jacksonville meeting. At the one session where there was any discussion on my comment, I spoke against the resolution and no one spoke for the resolution rejecting my suggested change (not to allow any use of 40 MHz channels in 2.4 GHz spectrum). (See attached)
As it current stands there is no clear method to prevent use of 40 MHz channels in 2.4 GHz when IEEE 802.15.1 and 802.15.4 devices are operating in the same spectrum.
You can vote against the current TGn letter ballot by referencing my comment (6069) that is unresolved (not accepted by the submitter) and requesting the same resolution: In 20.3.15 change "When using 40 MHz channels, it can operate in the channels defined in 20.3.15.1 and 20.3.15.2." to "When using 40 MHz channels, it can only operate in the channels defined in 20.3.15.2."
James Gilb may be able to clarify just how to vote on this. Voters who previously approved the original LB can change their vote to disapprove based on this comment.
Thank you for your support.
Regards, John
--
John R. Barr (John.Barr@Motorola.com)
Director, Standards Realization - <http://www.motorola.com>
Vice Chairman of the Board, Bluetooth SIG - <http://www.bluetooth.org>
(847) 576-8706 (office) +1-847-962-5407 (mobile) (847) 576-6758 (FAX)