Thread Links Date Links
Thread Prev Thread Next Thread Index Date Prev Date Next Date Index

[STDS-802-11-TGM] 25/1890 comment resolution on CIDs 28, 30, 365, 366, 367, 368, 369, 370, 371, 372, 373 (Channel usage procedures)



--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

Hi all

 

In more detail wrt earlier “Updated Channel usage procedures refactoring, unavailability bugfixes, misc topics and "implementation" MIB variable comment resolutions in 25/1890, 1891, 2177 and 2302” email, 25/1891 covers the following channel usage related CIDs, where review and feedback is welcome:

 

CID 28 (and 30):

Major refactoring of 11.21.15 to split out the sub-features. Highlights:

  • Refactoring into distinct subsections for distinct subfeatures, each with their own capability signaling
    • Thus added a new capability bit for the distinct Noninfrastructure BSS Channel Switching feature
  • Removed inconsistency whether TIE is always include or not: made it always present and defined 0 to indicate that the P2P TWT agreement was good till torn down
  • Renamed availability in 11.12.15 and clause 9 to “P2P-TWT-unavailability” given that the corresponding behavior is different that the behavior for the unavailability defined in 11.2.1 (and, looking ahead, DUO/PUO)
  • More clearly and completely defined that Channel Usage Req/Resp exchanges cannot mix’n’match Usage Mode = 0/1/2, 3, 4 and 5
  • Defined frame processing rules where some but not all Channel Usage subfeatures are supported
  • To support more BWs compactly and for greater consistency, defined that the “wider signaled operating classes also include narrower operating classes” rule applies to Usage Mode 1 as well as 0/2
  • Aligned Probe Req/Resp and Channel Usage Req/Resp behavior for Usage Mode = 0/1/2
  • Clarify that probe req/resp is not permitted for the Noninfrastructure BSS channel switching sub-feature
  • Various clarifications

 

As well:

365

11.21.15

3034.26

One sentence forbids the AP from sending TWT Teardown for any peer-to-peer TWT schedule, while a later sentence requires the AP to send TWT Teardown on lifetime expiry (page 3035). Both cannot be true.

Please resolve the conflict.

Revised.

The two sentences are merged where the second sentence is added as an exception to the first sentence.

Editor to apply changes under CID 365 in 25/1891<motionedRevision>.

 

 

366

11.21.15

3036.15

Procedure mandates a Country element, but the frame format provides only a Country String field.

Please clarify

Revised.

Changed “Country element” to “Country String field” in relation to the Channel Usage Response frame in 11.21.15.

Editor to apply changes under CID 366 in 25/1891<motionedRevision>.

 

367

11.21.15

3036.50

Allowing a STA to apply EDCA/TPE from an unassociated AP might be unsafe if the regulatory domain differs. A mere advisory NOTE is weak.

Please consider strengthening the language

Revised.

Added a NOTE specifically for these fields in the case of differing regulatory domains.

Editor to apply changes under CID 367 in 25/1891<motionedRevision>.

 

368

11.21.15

3032.50

It is unclear how the "also for narrower/encompassing channels" rule applies when the Channel Entry encodes noncontiguous groupings.

Please clarify

Rejected.

The narrower/encompassing rule states “A Channel Entry field … shall be interpreted as a recommendation for the indicated channel, and also for all narrower channels fully encompassed by the bandwidth of the indicated channel.”. The term “fully encompassed by” clearly excludes spectrum between noncontiguous frequency segments.

369

11.21.15

3032.50

Ambiguity whether the rule also applies to Usage Mode 1/4 (TDLS / BSS switch request).

Please clarify

Revised.

The rule clearly only applies to Usage Mode 0 and 2. As a bugfix, the rule should also apply to Usage Mode = 1. This is clarified as a side-effect of CID 28 wherein this text is moved to subclause specifically for modes 0/1/2 “11.21.15.2 Procedures common to a Usage Mode field equal to 0, 1 or 2 / The common procedures in this subclause pertain to Channel Usage elements with a Usage Mode field equal to 0, 1 or 2 …”

Editor: no further change required beyond the changes identified under CID 28.

370

11.21.15

3039.24

No rule covers individually addressed unsolicited responses to a STA that never requested channel usage.

Please clarify the non-AP STA's behavior.

Revised.

Added language for which received frames to process and how an AP populates the Dialog Token field.

Editor to apply changes under CID 370 in 25/1891<motionedRevision>.

 

 

371

11.21.15

3036.20

One TPE set may not be sufficient when the Channel Usage element spans channels with different local constraints. Please consider clarifying this.

As in comment

Revised

Since a client needs to meet both regulatory and local limits, it is atypical to have different local constraints (since the frequency reuse factor is typically reasonably invariant for a given deployment). Even so, it is worthwhile clarifying that the local limit needs to be selected to span all indicated channels, and sentence for this is added. Also use this CID to clarify the specific field that needs to be set to 0 or 1 to indicate a local power constraint.

Editor to apply changes under CID 371 in 25/1891<motionedRevision>.

372

11.21.15

3033.15

Need to clarify what happens when a Channel Usage element carries no Channel Entry during peer-to-peer TWT establishment--does the recommendation implicitly refer to the BSS operating channel, or is the channel unconstrained?

Please clarify

Rejected.

P2P-TWT-unavailability always refers to the defined behavior where the key behavior is the AP of the client treating the client as being in PS Mode during the P2P-TWT SPs (see 11mfD1.0P3035L29-42 which is the paragraph identified by (#28.30) in 25/1891<motionedRevision>), so this behavior always applies to the client’s BSS operating channel.

NOTE - in a request, no Channel Entry field is included a) for Usage Mode (UM)=0/1/2 if the client has no preference, or b) for UM=3 when the client reports its temporal unavailability for its P2P activity when either there is no possibility for the channel of that P2P to be influenced by the AP or the channel is outside 802.11 channels (e.g., cellular causes 802.11 P2P-TWT-unavailability).

In a CU response, “no Channel Entry field” is only used when a) the AP has nothing to recommend or b) with UM=3 when the client listed “no Channel Entry field” too.

373

11.21.15

3036.28

permits a STA to use EDCA, Power Constraint, and TPE from the associated AP but does not bind that use only to the indicated channels

Please clarify

Revised.

A sentence, aligned with the commenter’s proposal, is added to address this issue. As well, the usage of TPE elements in un/trusted channel usage is elsewhere restricted to local power constraints which should be clarified here too.

Editor to apply changes under CID 373 in 25/1891<motionedRevision>.

 

 

Best wishes
Brian

 

 


To unsubscribe from the STDS-802-11-TGM list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=STDS-802-11-TGM&A=1