Re: [802.15_GENERAL] TGn Letter Ballot Support
Title: Re: [802.15_GENERAL] TGn Letter Ballot Support
Matthew,
Thanks for your opinion.
Can you explain exactly how an 802.15 device can “signal the 40 MHz TGn devices”? I have gone through the current draft and don’t really see where this is clearly defined. I also asked someone from Atheros about how a current 802.11 device can signal the 40 MHz TGn devices and his response was that they can’t but 40 MHz devices who see non-TGn beacons should note this and prevent use of 40 MHz channels, but I can’t find that either.
Allowing 40 MHz operation with a broken coexistence mechanism seems to be worse than specifically not allowing 40 MHz operation with a shall in the standard. If someone decides to use 40 MHz channels, those that are affected may be able to withdraw their rights to any IP because the LOA only says you need to provide RAND licensing when the implementation conforms to the standard. Conforming with a broken coexistence mechanism seems to be a worse situation.
Regards, John
On 5/23/08 9:29 PM, "Matthew Fischer" <mfischer@broadcom.com> wrote:
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
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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)
--
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)