1. TGk LB71 Hidden category comment resolution
Month 2002
doc.: IEEE /xxxr0
Oct 2004
TGk LB71 Hidden category comment resolution
Simon Black (Nokia)
Black, Nokia
John Doe, His Company

2. Is the measurement useful?
Oct 2004
Is the measurement useful?
Comments
Delete the measurement?
Comments #153, #607
Is the measurement necessary/useful?
Comments #154
Define hidden node, or (preferably) delete the measurement)
Comment #481, #603
Recommended Resolution
Discuss - #153, #154, #607
If decision is to remove measurement, all subsequent suggested resolutions become ‘Counter – measurement removed’
Black, Nokia

3. Clarify/refine method of hidden node detection
Oct 2004
Clarify/refine method of hidden node detection
Comments
Hidden node mechanism based on first transmission frame observed without ACK may be due to other effects, e.g. interference
Comments #150, #152, #611
Mechanism is unclear – see reviewers note below
Comment #483, #600, #610
Mechanism would be clearer if observe an ACK was used in place of receive an ACK
Comment #604
Recommended Resolution
Accept all comments:
Make text clearer by use of observed in place of received
Add informative note to warn that false reports are possible due to other factors (also allow reduction of false positives as described for comment #1010)
Reviewers note: I suspect that some of the confusion surrounds the use of ‘measuring STA did not receive an ACK’, rather than ‘observe an ACK’.
Black, Nokia

4. Define Hidden Node Comments Add a definition for the term Hidden Node
Oct 2004
Define Hidden Node
Comments
Add a definition for the term Hidden Node
Comments #256, #602
Recommended Resolution
Decline (?)
Not sure a general definition required. Surely better to provide a specific description of the criteria for this measurement.
Black, Nokia

5. Clarify which frames are counted
Oct 2004
Clarify which frames are counted
Comments
Are only unicast data, or management frames reported (since these are the frames for which an ACK is expected)?
Comments #605, #606, #609
Recommended Resolution
Accept all comments and:
Reword p25 l16-18 to clarify that only frames for which an ACK is expected are counted (this possibly needs to be moved to clause )
Black, Nokia

6. Issues and refinements (1)
Oct 2004
Issues and refinements (1)
Comments
Allow a report containing no hidden node doublets
Comment #149
Replace ‘one or more hidden node reports’ with ‘a hidden node report’ on p16 l23
Comment #482
Clarify what doublet may be repeated in Figure k14
Comment #608
Recommended Resolution
Accept #149, #608:
Change text to allow zero hidden node entries in , and
Name doublet in k14 ‘hidden node entry’ (see figure k18) and change text to say the element contains zero or more hidden node entries
Discuss #482
Can reports to a single request span multiple elements?
Black, Nokia

7. Issues and refinements (2)
Oct 2004
Issues and refinements (2)
Comments
What happens if frame count >255?
Comment #613
Allow measuring STA to reduce false positives by discounting STAs where an ACK is subsequently observed for a retransmission.
Comment #1010
Does the measurement work across BSSs?
Comments #599, #612
Recommended Resolution
Accept #613
Propose number reported has ceiling of 255 (is there any point in reporting a number >255?)
Accept #1010
Add text to allow reduction of false positives by the mechanism suggested
Discuss #599, #612
Black, Nokia

8. Security Comments Comment #601 Recommended Resolution
Oct 2004
Security
Comments
Comment #601
Implications on security of hidden node reporting
Recommended Resolution
Reclassify and consider in security category
Black, Nokia