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Re: [STDS-802-11-TGBB] [EXTERNAL] [STDS-802-11-TGBB] doc. 11-21/1688r2 uploaded

Hi Volker,

 

The figures from Chong show the tx and rx chains for an implementation using existing 802.11 chipsets that have integrated RF components. Admittedly this is an inefficient and bulky implementation, but it has the major advantage that it can be realized today with commercially available chipsets.

The figures you provide are a nice improvement of D0.6 Figure 1, showing a (future) baseband implementation, i.e. using chipsets that do not contain RF components.

I see two choices for TGbb:

  1. Include both implementation options, in which case the spec must ensure the two options are interoperable. Based on the information from Dorothy last week, I believe the only way to achieve this is to require all implementations to use the LC channelization and LC operating classes, but this will require software on existing chipsets must be modified.
  2. Show only the implementation option using existing chipsets to allow existing chipsets to be used without any modification, and leave support for a baseband implementation (in a manner backwards compatible with 11bb implementations) to be solved in a future amendment.

 

For choice 2, we further need to deal with the question of whether those chipsets are configured for 2.4 GHz, 5 GHz, or 6 GHz operation, When discussing with Dorothy last week, we determined that it is not possible for an implementation configured for one band (e.g., 2.4 GHz) to interoperate with an implementation configured for a different band (e.g., 6 GHz), because we know the channelization and operating classes for the different bands are not interoperable. I see the following options:

  1. Pick one RF operating band. I would argue that requiring all 802.11bb implementations to use chipsets configured for 5 GHz operation is the most realistic option today.
  2. Partition the IF spectrum; for example 6-26 MHz for 2.4 GHz based implementations (based on 11-20/1449r3), 26-186 MHz for 5 GHz based implementations, 186-346 MHz for 6 GHz based implementations. Implementations using one band wouldn’t be interoperable with implementations using other bands, but at least they won’t interfere.
  3. A combination of a and b, where we pick one RF operating band for today but reserve part of the IF spectrum for baseband implementations; for example 16-176 MHz for 5 GHz based implementations and 176-336 MHz for baseband implementations of the future.

 

Regards,

-Nancy

 

From: ** STDS-802-11-TGbb -- Light Communication Task Group** <STDS-802-11-TGBB@xxxxxxxxxxxxxxxxx> On Behalf Of Jungnickel, Volker
Sent: Wednesday, October 27, 2021 8:11 PM
To: STDS-802-11-TGBB@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBB] AW: [EXTERNAL] [STDS-802-11-TGBB] doc. 11-21/1688r2 uploaded

 

CAUTION: This email is from outside the organization. Do not click on links or open attachments unless you trust the sender.

 

Dear Chong, Nancy,

 

I have had a different understanding of the second graph. What I suggested as a baseband implementation, besides the bulky down-conversion graph, is enclosed. 

 

I have removed the radio-specific parts and the bias addition point before the OFE because this is different at least in  HHI OFEs which are always AC coupled. The bias settings are not usually accessible. I have left the DC block in in case some alien OFEs would outputs any spurious DC signals. In my personal opinion, one could leave the bias and DC block out of the entire chain. The RF folks will ask us as experts anyway in case they want to use an OFE. It should always be AC-coupled, both ways.

 

Please let me know if the enclosed figure is fine with you. 

 

Best regards - Volker

 

Von: ** STDS-802-11-TGbb -- Light Communication Task Group** <STDS-802-11-TGBB@xxxxxxxxxxxxxxxxx> im Auftrag von Chong Han <chong.han@xxxxxxxxxxxx>
Gesendet: Montag, 25. Oktober 2021 16:19:51
An: STDS-802-11-TGBB@xxxxxxxxxxxxxxxxx
Betreff: Re: [STDS-802-11-TGBB] [EXTERNAL] [STDS-802-11-TGBB] doc. 11-21/1688r2 uploaded

 

Dear all,

 

The document is updated to version 3 with the figure changed. The current figure contains both the modifications for LC and the original figure from Fig. 17-12.

 

Link: https://mentor.ieee.org/802.11/dcn/21/11-21-1688-03-00bb-proposed-changes-for-tgbb-draft-0-6.docx

 

Regards,

 

Chong

 

 

From: ** STDS-802-11-TGbb -- Light Communication Task Group** <STDS-802-11-TGBB@xxxxxxxxxxxxxxxxx> On Behalf Of Chong Han
Sent: 22 October 2021 10:35
To: STDS-802-11-TGBB@xxxxxxxxxxxxxxxxx
Subject: [EXTERNAL] [STDS-802-11-TGBB] doc. 11-21/1688r2 uploaded

 

CAUTION: This email originated from outside of pureLiFi. Do not click links or open attachments unless you recognize the sender and know for certain that the content is safe.

 

Dear all,

 

I’ve uploaded the doc. 11-21/1688r2 which has the updated 40 MHz channel in the 2.4 GHz band mapping, the Figure 1 and its description, and the subclauses moved to the general PHY section.

 

The link is here: https://mentor.ieee.org/802.11/dcn/21/11-21-1688-02-00bb-proposed-changes-for-tgbb-draft-0-6.docx

 

 

Regards,

 

Chong

 

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