111103490100accommentsresolutionsoundingprotocol.docx

111103490100accommentsresolutionsoundingprotocol.docx

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111103490100accommentsresolutionsoundingprotocol

IEEEP802.11

WirelessLANs

11acSoundingprotocol

Date:

2011-03-14

Author（s）:

Name

Affiliation

Address

Phone

Email

SimoneMerlin

QualcommInc

5775MorehouseDr

SanDiego,CA92109

8588451243

smerlin@

IllsooSohn

LGE

LGR&DComplex533,Hogye-1dong,Dongan-Gu,Anyang-Shi,Kyungki-Do,431-749,Korea

+82-31-450-1882

Illsoo.sohn@

YongLiu

Marvell

5488MarvellLane,SantaClara,CA95054,USA

+1-408-222-8412

yongliu@

Abstract

Thisdocumentprovidesresolutionforthecommentslistedbelow

Commentsarefrom:

11-11-0276-00-00ac-tgac-d0-1-comments.xls

Commentsreferto:

DraftP802.11ac_D0.1.pdf

Changesinthetextreferto:

DraftP802.11ac_D0.1.pdf

Comments

Commentsregardingcapabilitiesindication

170

9.21.5v

57

13

TR

YoudefinehowtodecideSUBeamformer/BeamformeeCapabilityfieldinaSTA.ButtheMuTX/RX（MUbeamformer/beamformee）ismissing.

addthetextaccordingly.

Agree.Addedtext（Simone）

MU

949

9.21.5

57

1

TR

"ASTAthathasthevaluetruefordot11VHTBeamformerEnabledshallsettheSUBeamformerCapability

fieldto1intransmittedVHTCapabilitieselements.ASTAthathasthevaluetruefor

dot11VHTBeamformeeEnabledshallsettheSUBeamformeeCapabilityfieldto1intransmittedVHTCapabilities

elements.ASTAthatdoesnothavethevaluetruefordot11VHTBeamformerEnabledshallnotactin

theroleofabeamformer.ASTAthatdoesnothavethevaluetruefordot11VHTBeamformeeEnabledshall

notactintheroleofabeamformee."dot11VHTBeamformeeEnabledisnotdefinedanywhere

Add:

ASTAthathasthevaluetruefordot11VHTMUBeamformerEnabledshallsettheMUTxCapablefieldto1intransmittedVHTCapabilitieselements.ASTAthathasthevaluetruefordot11VHTMUBeamformeeEnabledshallsettheMURxCapablefieldto1intransmittedVHTCapabilitieselements.

ASTAthatdoesnothavethevaluetruefordot11VHTBeamformerEnabledordot11VHTMUBeamformerEnabledshallnotactintheroleofabeamformer.ASTAthatdoesnothavethevaluetruefordot11VHTBeamformeeEnabledordot11VHTBeamformeeEnabledshallnotactintheroleofabeamformee.

Agreeinprinciple.

Modifiedtext

（Simone）

MU

1158

9.21.5

57

13

TR

ThedescriptionneedstobeextendedforMURxCapableandMUTxCapable.Also,thereisadependency:

anMURxCapabledeviceisalsoSUBeamformeeCapable.

Extenddescription

Agree

Refertosuggestedchangesinthefollowing（Yong）

MU

CommentsregardingBWofresponseframes

1540

9.21.5

57

1

TR

Duringthesoundingprocedures,BWindicationsformeasurementandtransmissionareclear.Forexample,whatisthePPDUBWoftheVHTCompressedBeamformingReportwhenthereareNDPAdecodingfailurinsomesecondarychannels?

WhatistheBWofSoundingPollwhenbeamformerhavereceivedVHTCompressedBeamformingReportofonlypartialchannel?

etc.

ClarifyBWsofNDPA,NDP,VHTCompressedBeamforming,andSoundingPollframes.

Deferredresolution

MU

1423

9.21.5

57

1

TR

Cluase9.21.5VHTsoundingprotocolneedssomemoreclarificationonthetransmissionofNDPA,NDP,andVHTcompressedbeamforming;thatis,non-HTduplicateform,Reportingmanagementunderinterferenceinsecondarychannels,etc.

Defineclearbehavior.

Deferredresolution

MU

1466

9.21.5

57

42

TR

bandwidthofpollframesisnotclear,andbandwidthofresponsestothepollframeisalsonotclear

clarify

Deferredresolution

MU

1080

9.21.5

57

1

TR

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.

Modified.BWofNDPisspecified,BWoftheCompressedbeamformingnotaddressedinthisresolution

MU

Commentsregardingusingbeamforming/beamformeeterms

950

9.21.5

57

1

TR

ThesectionshouldbeconsistentlyusingtheconceptofbeamformerandbeamformeeinsteadofAPandSTA;thewayitiscurrentlywrittenwouldevenforbidaSTAtoSTASUTxBF;

changeAPwithbeamformerandSTAtobeamformeewhenappropriate;

Agree（Simone）

MU

784

9.21.5

57

42-53

TR

WhyusingAPinsteadofbeamformerhere?

Cananon-APbeamformersendaNDPAwithmultipleSTAinfofields?

clarifythatanon-APbeamformercanonlysendaNDPAwithasingleSTAinfofieldandusingaunicastNDPA

Modify.

UsedbeamformerinsteadofAP.Non-APcanalsosendNDPAwithmultipleSTAInfofield,thereisnoreasontoimposealimit（Simone）

MU

Commentsregardingsoundingpoll

803

9.21.5

57

1

TR

Sub-clause22.3.13statesthatNDPistheonlyVHTsoundingformat.TheuseofsoundingpollasshowninFigure9.37bviolatesthisrule

InFigure9.37b,replacethesoundingpollframeswithNDPs

Disagree

SoundingpollisusedforsolicitsoundingFBs,notforsoundingpurpose.Don’tseewhyitviolatestherule.（Yong）

MU

Commentsregarding‘Nullfeedback’

951

9.21.5

57

49

TR

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）

MU

Commentsregardingsegmentation

1422

9.21.5

59

9

TR

ThemaximumnumberofsegmentsofVHTCompressedBeamformingReportfieldis7.

Correct'TBD'to'7'

Modified.（Simone）indicated8segments

MU

959

9.21.5

59

8

TR

"IfitwouldotherwiseresultinanMMPDUthatexceedsthemaximumMPDUsize,theVHTCompressedBeamformingReportfieldmaybesplitintouptoTBDsegments.Eachsegmentshallcontainanequalnumberofoctetsexceptforthelastsegment,whichmaybesmaller.Allsegmentsshallbesentwithinthesame

A-MPDU."Accordingtothetext,MUExclusivefiledisnotsplitacrossmultiplesegments;thiswouldresultinduplicatedMUExclusivefield,increasingoverhead.

AddindicationofwhattodowithMUExclusivereportfield:

"IfitwouldotherwiseresultinanMMPDUthatexceedsthemaximumMPDUsize,theVHTCompressed

BeamformingReportfieldandMUExclusivereportfieldmaybesplitintoupto8segments.Eachsegmentshallcontainanequalnumber

ofoctetsexceptforthelastsegment,whichmaybesmaller.Allsegmentsshallbesentwithinthesame

A-MPDU.Ifsegmented,BeamformingReportfieldandMUExclusivereportfieldshallbesplitinthesamenumberofsegments."

Agree.（Simone）.Asincomment

MU

961

9.21.5

59

8

TR

"IfitwouldotherwiseresultinanMMPDUthatexceedsthe[...]".Segmentationofsoundingfeedbackneedmoredetailedspecification;SegmentsneedbeidentifiedbyanIDandreceiverneedbeabletodetermineifallsegmentsarereceived;

AddinVHTMIMOcontrolfield（7.3.1.31VHTMIMOControlfield）a3-bits（bits12-14）"remainingsegments"indicationanda1-bit（B15）"firstsegment"indication;;‘RemainingSegmentsisSetequaltothenumberofremainingsegmentsoftheCompressedBeamformingReportfieldtobesent,excludingthecurrentone.Thefieldshallbesettothetotalnumberofsegmentsminus1iftheFirstSegmentfieldsetto1.

Incaseofaretransmittedsegment,thefieldissettothesamevalueassociatedwiththesegmentintheoriginaltransmission.

IncaseofaCompressedBeamformingframenotcarryingaCompressedBeamformingreportfield,thefieldissettoallones;