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TGk LB71 Hidden category comment resolution

This discussion focuses on the usefulness of a hidden node measurement and proposes resolutions to clarify the mechanism and improve accuracy. It also addresses issues related to doublets, frame counting, false positives, and security implications.

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TGk LB71 Hidden category comment resolution

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  1. TGk LB71 Hidden category comment resolution Simon Black (Nokia) simon.black@intalk2k.com Black, Nokia

  2. 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’ Is the measurement useful? Black, Nokia

  3. 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) Clarify/refine method of hidden node detection 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. 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. Define Hidden Node Black, Nokia

  5. 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 11.7.8.5) Clarify which frames are counted Black, Nokia

  6. 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 7.3.2.21.8, 7.3.2.22.8 and 11.7.8.5 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? Issues and refinements (1) Black, Nokia

  7. 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 Issues and refinements (2) Black, Nokia

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

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