Hi Pei,
Thank you for your contribution.
I am still concerned about security. I don’t have a clear solution yet.
I have a few comments/suggestions embedded in the attached doc.
Could you please take a look?
Regards,
Abhi
From: ** STDS-802-11-TGbc -- Enhanced Broadcast Service ** <STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx>
On Behalf Of ??(Zhou Pei)
Sent: Thursday, May 27, 2021 6:06 AM
To: STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGBC] 答复: Discussion on EBCS Request ANQP-element
CAUTION:
This email originated from outside of the organization.
Hi Mark,
Thanks for your comments.
> Thanks for the update. I attach further comments.
Attached please find a revised version based on your comments. Please let me know If you have further comments.
I would be great if you can add your suggested content into our text proposal.
>
Well, 11.100.5 is about responding to a notice of termination, where
obviously what you'd want to do is to extend the session. I don't
think that means that all you can use the Requested Time To Termination
field is for extension. As I said, if that's the case, I would like
to see that stated explicitly, and I'd also like to understand why
a stream should be kept running even if no-one is listening to it.
I agree that the Requested Time To Termination subfield can be used to extend and/or shorten the EBCS services.
I think both are OK, and I didn’t
put any restrictions in our text.
Best regards,
Pei Zhou
发件人:
Mark Rison <m.rison@xxxxxxxxxxx>
发送时间: 2021年5月27日 19:54
收件人: 周培(Zhou Pei) <zhoupei1@xxxxxxxx>;
Xiaofei.wang@xxxxxxxxxxxxxxxx;
STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx
抄送: HUANG LEI <huang.lei1@xxxxxxxx>
主题: RE: Discussion on EBCS Request ANQP-element
Hello Pei,
> Attached please find a revised text proposal. Some updates are made based on Mark’s comments.
> Please let me know if you have further comments or if you have additional content to be added to the text proposal, thanks!
Thanks for the update. I attach further comments.
>
As for the case of using Time To Termination to extend the TTT, I found some related content in Clause 11.100.5 EBCS Termination Notice Procedure (page 58 of D1.02) attached
below. I didn’t find the case of using Time To Termination request to shorten the TTT as well.
Well, 11.100.5 is about responding to a notice of termination, where
obviously what you'd want to do is to extend the session. I don't
think that means that all you can use the Requested Time To Termination
field is for extension. As I said, if that's the case, I would like
to see that stated explicitly, and I'd also like to understand why
a stream should be kept running even if no-one is listening to it.
Thanks,
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601
ROYAUME UNI WWW:
http://www.samsung.com/uk
From:
周培(Zhou Pei) <zhoupei1@xxxxxxxx>
Sent: Thursday, 27 May 2021 02:53
To: Mark Rison <m.rison@xxxxxxxxxxx>;
Xiaofei.wang@xxxxxxxxxxxxxxxx;
STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx
Cc: HUANG LEI <huang.lei1@xxxxxxxx>
Subject: 答复: Discussion on EBCS Request ANQP-element
Hi Mark and Xiaofei,
Thank you for your valuable comments and discussions.
Attached please find a revised text proposal. Some updates are made based on Mark’s comments.
Please let me know if you have further comments or if you have additional content to be added to the text proposal, thanks!
As for the case of using Time To Termination to extend the TTT, I found some related content in Clause 11.100.5 EBCS Termination Notice Procedure (page 58 of
D1.02) attached below. I didn’t find the case of using Time To Termination request to shorten the TTT as well.
Best regards,
Pei Zhou
发件人:
** STDS-802-11-TGbc -- Enhanced Broadcast Service ** <STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx>
代表 Mark Rison
发送时间: 2021年5月27日 3:56
收件人:
STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx
主题: Re: [STDS-802-11-TGBC] Discussion on EBCS Request ANQP-element
> I don’t think that in the existing spec we have discussed the case of using Time To Termination request to shorten the TTT, it has been used to
extend the TTT, at least that is my impression. I suppose it is a case we can consider or we can be more specific about it in the protocol description.
Hm, I've just grepped D1.02 and I can't find anything that indicates it's
only used to extend the duration of a TS. Am I missing something?
If this is indeed the intent, then I think it definitely needs some words,
because to me it's very counter-intuitive (if there is only one subscriber
to a TS, and they've said they only need it for 5 more minutes, why would
you keep broadcasting it for the next hour?).
Thanks,
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601
ROYAUME UNI WWW:
http://www.samsung.com/uk
From:
** STDS-802-11-TGbc -- Enhanced Broadcast Service ** <STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx> on behalf of Mark Rison <m.rison@xxxxxxxxxxx>
Sent: Wednesday, May 26, 2021 7:26:03 AM
To: STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx <STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx>
Subject: Re: [STDS-802-11-TGBC] Discussion on EBCS Request ANQP-element
Thanks, Pei. I attach my comments.
Also, this mechanism has no protection against an attacker causing
premature termination of an EBCS TS by forging an EBCS req ANQP-element
with a short Requested Time To Termination, right?
Thanks,
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601
ROYAUME UNI WWW:
http://www.samsung.com/uk
> -----Original Message-----
> From: ** STDS-802-11-TGbc -- Enhanced Broadcast Service ** <STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx> On
> Behalf Of ??(Zhou Pei)
> Sent: Wednesday, 26 May 2021 11:25
> To: STDS-802-11-TGBC@xxxxxxxxxxxxxxxxx
> Subject: [STDS-802-11-TGBC] Discussion on EBCS Request ANQP-element
>
> Hi all,
>
> I presented a contribution titled "Text Proposal for EBCS Request ANQP-element" (doc: 11-21-0600-02-
> 00bc-text-proposal-for-enhanced-broadcast-request-anqp-element) in the last teleconference.
> Some members raised the security issue of adding Requested Time to Termination subfield to the EBCS
> Request ANQP-element, since one unassociated non-AP STA may maliciously request a long time, which
> will have negative effects on the other non-AP STAs.
> I think this issue can be solved by limiting the time duration and/or frequency of ECBS services
> requested by unassociated non-AP STAs. That is to say, the EBCS transmitter of an EBCS has the
> authority to determine the time to termination of the EBCS.
>
> Attached pleased find a revised version of my proposal. I added a new Clause 11.100.5 EBCS Negotiation
> Procedure for Unassociated STAs.
> Please let me know if you have any comment, thanks!
>
>
> Best regards,
>
> Pei Zhou
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