111103490000accommentsresolutionsoundingprotocolWord格式.docx
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111103490000accommentsresolutionsoundingprotocolWord格式.docx
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5775MorehouseDr
SanDiego,CA92109
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smerlin@
IllsooSohn
LGE
LGR&
DComplex533,Hogye-1dong,Dongan-Gu,Anyang-Shi,Kyungki-Do,431-749,Korea
+82-31-450-1882
Illsoo.sohn@
YongLiu
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+1-408-222-8412
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Abstract
Thisdocumentprovidesresolutionforthecommentslistedbelow
Commentsarefrom:
11-11-0276-00-00ac-tgac-d0-1-comments.xls
Commentsreferto:
DraftP802.11ac_D0.1.pdf
Changesinthetextreferto:
Comments
160
9.21.5
57
2
TR
IftheNDPAframeandVHTCompressBeamformingframesaresentinnonVHTlegacyformat,thesoundingsequencedefinedinthissubclausecanprovideprotectionagainsthiddennodes.
Defineamechanismwheresoundingandprotectioncanbeprovidedatthesametimetoimproveefficiency.
Modified
(Simone)
Accordingtoothercomments,descriptioninNDPAsectiondefinesthesettingfortheDurationfield
MU
170
13
YoudefinehowtodecideSUBeamformer/BeamformeeCapabilityfieldinaSTA.ButtheMuTX/RX(MUbeamformer/beamformee)ismissing.
addthetextaccordingly.
Agree.Addedtext(Simone)
1423
1
Cluase9.21.5VHTsoundingprotocolneedssomemoreclarificationonthetransmissionofNDPA,NDP,andVHTcompressedbeamforming;
thatis,non-HTduplicateform,Reportingmanagementunderinterferenceinsecondarychannels,etc.
Defineclearbehavior.
Deferredresolution
1466
42
bandwidthofpollframesisnotclear,andbandwidthofresponsestothepollframeisalsonotclear
clarify
784
42-53
WhyusingAPinsteadofbeamformerhere?
Cananon-APbeamformersendaNDPAwithmultipleSTAinfofields?
clarifythatanon-APbeamformercanonlysendaNDPAwithasingleSTAinfofieldandusingaunicastNDPA
Modify.
UsedbeamformerinsteadofAP.Non-APcanalsosendNDPAwithmultipleSTAInfofield,thereisnoreasontoimposealimit(Simone)
803
Sub-clause22.3.13statesthatNDPistheonlyVHTsoundingformat.TheuseofsoundingpollasshowninFigure9.37bviolatesthisrule
InFigure9.37b,replacethesoundingpollframeswithNDPs
Disagree
SoundingpollisusedforsolicitsoundingFBs,notforsoundingpurpose.Don’tseewhyitviolatestherule.(Yong)
StatementneedbemodifiedtoclarifythatisreferstoVHTonly.Chengenametosoundingfeedbackpoll.
949
"
ASTAthathasthevaluetruefordot11VHTBeamformerEnabledshallsettheSUBeamformerCapability
fieldto1intransmittedVHTCapabilitieselements.ASTAthathasthevaluetruefor
dot11VHTBeamformeeEnabledshallsettheSUBeamformeeCapabilityfieldto1intransmittedVHTCapabilities
elements.ASTAthatdoesnothavethevaluetruefordot11VHTBeamformerEnabledshallnotactin
theroleofabeamformer.ASTAthatdoesnothavethevaluetruefordot11VHTBeamformeeEnabledshall
notactintheroleofabeamformee."
dot11VHTBeamformeeEnabledisnotdefinedanywhere
Add:
ASTAthathasthevaluetruefordot11VHTMUBeamformerEnabledshallsettheMUTxCapablefieldto1intransmittedVHTCapabilitieselements.ASTAthathasthevaluetruefordot11VHTMUBeamformeeEnabledshallsettheMURxCapablefieldto1intransmittedVHTCapabilitieselements.
ASTAthatdoesnothavethevaluetruefordot11VHTBeamformerEnabledordot11VHTMUBeamformerEnabledshallnotactintheroleofabeamformer.ASTAthatdoesnothavethevaluetruefordot11VHTBeamformeeEnabledordot11VHTBeamformeeEnabledshallnotactintheroleofabeamformee.
Agreeinprinciple.
Modifiedtext
(Simone)
950
ThesectionshouldbeconsistentlyusingtheconceptofbeamformerandbeamformeeinsteadofAPandSTA;
thewayitiscurrentlywrittenwouldevenforbidaSTAtoSTASUTxBF;
changeAPwithbeamformerandSTAtobeamformeewhenappropriate;
Agree(Simone)
952
AbeamformeethatreceivesanNDPAfromanAPtowhichitisassociatedandthatcontainstheAIDassigneditduringassociationintheSTAIDsubfieldofthefirstSTAInfofieldshall[...]"
thissentenceisspecificforAPtoSTATXBFandwouldnotallowSTAtoSTATxBF
Suggesttochangeto:
"
AbeamformeethatreceivesanNDPAfromabeamformertowhichitisassociatedorhasaDLSorTDLSsessionsetupandthatcontainsthebeamformeeAID[...]"
Agree
Refertosuggestedchangesinthefollowing
(Yong)
951
49
TherearecaseswhenthesoundingfeedbackdoesnotfitinaPPDU,duetoexceededduration;
thiscanhappenincasetheSoundingPollframeissentwithaBWsmallerthantheBWofthechannelfeedbackincludedintheresponseframe;
Forthiscaseitisusefulthatthebeamformeerespondswithashortframenotcontainingthefeedback;
thisisusefulinenablingamorerobustoperationincaseotherframesneedbesentsubsequently(e.g.apollfoeanotherSTA);
italsoprovidesthebeamformeewiththeindicationthatSTAisstillwithinrangeandisactive;
Proposetomodifytheparagraphasfollows:
IfthebeamformeedoesnothaveavalidVHTCompressedBeamformingReport,ofifthetransmissiondurationoftheVHTCompressedBeamformingReportframewouldexceedthemaximumPPDUduration,thebeamformee
shalltransmitaVHTCompressedBeamformingframewithoutincludingtheVHTCompressedBeamforming
ReportfieldorMUExclusiveBeamformingReportandindicatingthisintheVHTMIMOControlfield
asdescribedin7.3.1.31(VHTMIMOControlfield).G74
Agree.(Simone)
Asincomment
Needtoclarify“IfthebeamformeedoesnothaveavalidVHTCompressedBeamformingReport”
Refertosuggestedchangedinthefollowing
(Yong)
1079
Incurrentspecification,aSoundingPollframemayincludesomeadditionalfieldstoimprovesoundingprocedures.Thefollowingisonesuggestionfortheusageofnewfields.
VHTCompressedBeamformingReportfieldcangrowuptoapproximately26Kbytes,whichislargerthanthemaximumallowedMPDUlimitformanagementframes.ThismakesaVHTCompressedBeamformingframeintheformofA-MPDU.SinceeachMPDUsintheA-MPDUcanbecheckedwithindividualFCSwhetherthetransmissionissuccessornot,selectiveretransmissionofonlyfailedsegmentsintheA-MPDUcanconsiderablyincreasethetransmissionefficiencyinsoundingprocedures.TosupporttheselectiveretransmissionofsegmentsinVHTCompressedBeamformingframe,anewinformationfieldwhichindicatesthetransmissionsuccessesorfailuresofindividualsegmentsneedtobeaddedinaSoundingPollframe.
UponthereceptionoftheSoundingPollframewhichincludesthesegmentinformationfield,aSTAmaytransmitallsegmentsintheVHTCompressedBeamformingframeortransmitonlythefailedsegments.Thisselectiveretransmissionofsegmentsisanoptionalfeature.
AddanoptionalSTAbehaviortosupporttheselectiveretransmissionofsegmentsinVHTCompressedBeamformingframe.
Agree.(Simone,Illsoo)
1080
InVHTsoundingprotocol,thespecificationisunclearontherelationsofBWsoftheframes;
NDPA,NDP,VHTCompressedBeamforming,andSoundingPollframes.
(a)WhatistheexpectedbehaviorofaSTAwhenitdoesnothaveavalidchannelinformation(e.g.,duetointerference)onsomepartoftheBWforwhichchannelinformationisrequestedbythebeamforer?
MaytheSTAsupposedtocomputeVHTCompressedBeamformingReportonlyusingvalidBW?
(b)IntheabovecasethataSTAtransmitmayreportVHTCompressedBeamformingReportonreducedBWthanrequested,whatisthetransmitBWofVHTCompressedBeamformingframePPDU?
(c)WhenthebeamformerreceivesVHTCompressedBeamformingReportforonlypartialBWofrequestedBW,thebeamformerneedstodeterminewhethertheBWofSoundingPollframetobetheoriginalvaluewhichisthesamewiththatofNDPA/NDPorbethereducedBWasintheVHTCompressedBeamformingReport.
(d)WhatistheexpectedbehaviorofaSTAwhentheBWoftheSoundingPollframeisnotequaltoNDPA/NDP?
ShouldaSTAconsiderittobedetectionerrorduetointerferenceortobebeamformer'
sdecisiontoreduceit?
(e)WhenaSTAisrequestedVHTCompressedBeamformingReportforonlyapartialBWofNDPA/NDPandtheWMisidleforfullBWofNDPA/NDP,mayaSTAtransmitVHTCompressedBeamformingframethroughNDPA/NDPBWtoshortenthetransmissiontime?
ClarifyVHTsoundingprotocol.SomerulesforspecifiyBWsofNDPA,NDP,VHTCompressedBeamforming,andSoundingPollframesarerequired.
Agreeinprinciple
SameasCID1466(Yong)
1539
TherecanbeanadditonalfieldforSoundingPoll.SinceVHTCompressedBeamformingReportmaybesegmentedinsomecases,selectiveretransmissionofsegmentedCompressedBeamformingReportshouldmakefeedbackprocessefficient.Tosupportthisretransmissionprocedure,anewfieldwhichindicatesthesegmentinformationneedstobeadoptedinSoundingPollframe.Theselectiveretransmissionofsegmentsisanoptionalfeature.
DescribeanSTAbehaviortosupporttheselectiveretransmissionofsegmentsinVHTCompressedBeamformingframe.Thiscanbeoptional.
1540
Duringthesoundingprocedures,BWindicationsformeasurementandtransmissionareclear.Forexample,whatisthePPDUBWoftheVHTCompressedBeamformingReportwhenthereareNDPAdecodingfailurinsomesecondarychannels?
WhatistheBWofSoundingPo
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