111103450000accommentsresolutionhtcontrolfield.docx

111103450000accommentsresolutionhtcontrolfield.docx

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111103450000accommentsresolutionhtcontrolfield

IEEEP802.11

WirelessLANs

11acHTControlfield

Date:

2011-03-xx

Author（s）:

Name

Affiliation

Address

Phone

email

SimoneMerlin

QualcommInc.

5775MorehouseDr,

SanDiegoCA92109,USA

8588451243

smerlin@

Abstract

-Thisdocumentprovidesresolutionforthecommentslistedbelow.Commentsmainlyrefertosection7.1.3.5a,butmodificationalsoinvolvesection7.1.3.1.9,9.7a,7.3.2.56,3.3.Minorsuggestedchangesalsorefertoothersections.

-Commentsarefrom:

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

-Commentsreferto:

DraftP802.11ac_D0.1.pdf.

-Inprovidinginstructionforspecediting,thefollowingconventionsareused.

oRedtextindicateschangestobeappliedtoexistingtextinDraftP802.11ac_D0.1.pdf.

oTextinblueistextcopiedfromthe802.11n-2009baselinethatwasnotshowninthe11acdraftandthatneedbeaddedtothedraft,withthemodificationsshowningreen.

oTextinblackisunmodifiedtextfromDraftP802.11ac_D0.1.pdf.

oItaliclightgraytextindicatesinstructiontotheeditor.

Commentsfrom11-11-0276-00-00ac-tgac-d0-1-comments.xls

Commentsreferredtoclarificationinthedescription

23

7.1.3.5a

5

37

TR

ThismodifiedrowofTable7-6ashouldberemoved,becauseMFBsubfieldinVHTcontrolfieldisdefinedbyTable7-6h.

Asincomment.

Agree.Asincomment

MAC

906

7.1.3.5a

5

19

ER

HTandVHTcontrolfieldsshouldhavetwoindependentdescriptions.Forinstance,referringtothisrowofthetable,inVHTcaseMFB（asshowninthepicturebelow）includestheSNR,henceHTMFBandVHTMFBaredifferent.Also,MAIisnotdefinedfortheVHTcase

SuggesttointroduceadefinitionforanHTcontrolfieldin'HTformat'andoneforaHTcontrolfieldin'VHTformat';HTcontrolfieldisdefinedas[B0=HT/VHT,B1-B31=dependingonHT/VHTformat];HTformatdescriptionforB1-B31reflects11n-2009andsimplyaddtextspecifyingthatthisisthemeaningwhenB0issetto0.VHTformathasanindependentdescriptionforB1-B31whichusesthecurrentoneintable7-6handisvalidonlywhenB0issetto1;Thedenomination+HTCisintendedtomeanthatanHTcontrolfieldisincluded（eitherinHTorVHTformat）;Whenrelevant,theHTorVHTformatisexplicitlyindicatedwithadditionaltext;

Agree.Asincomment

Ed

1344

7.1.3.5a

5

36-56

TR

Don'tneedtore-interpretMFB/ASELCfieldinTable7-6a,becausewhenHT/VHTfieldis1,subsequenttext,figuresandtablesalreadyexplainthere-defineHTCfieldindetails,thereforethistableisredundant.

Removethementionedtextandtable7-6a.

Agree.Asincomment

MAC

1473

7.1.3.5a

5

42

TR

thedefinitionofMFB/ASELCsubfieldisnotaccuratewhenitisasasubfieldofVHTcontrolfield.

iftheHT/VHTsubfieldissettothevalue0,thissubfieldcontainsrecommendedMFBexpressedasanHTMCS,andiftheHT/VHTsubfieldissettothevalue1,the4highestnumberedbitsofthissubfieldcontainsarecommendedVHTMCS,andthelowestnumbered3bitsofthissubfieldcontainarecommendedVHTNSTSisinterpretedasdefinedinFigure7-4f.

Modified.DescriptionforHTandVHTformathavebeenplacedinseparatesections

MAC

1120

7.1.3.5a

5

11

TR

Thissectiondoesnotmakealotofsenseasamended.Essentiallytwoformatsforthisfieldaredescribed:

HTControlandVHTControl,distinguishedbythesettingofB0.Elsewhere,thefieldalternatelyreferredtoasHTControlandVHTControldependingoncontext.Whatismeantbythenameshouldbeexplicitlystatehere.Thissectioncouldbereworkedtomoreclearlydescribethetwoformats.

Renamethefield"HT/VHTControl".Definemeaningto"HTControl"and"VHTControl"（i.e.formatdependentonB0setting）.Reworkformatdescriptionforclarity.

Modified.proposednewdescriptionaccountforthiscomment

MAC

1472

7.1.3.5a

5

10

TR

wronglocationofthesection7.1.3.5aHTControlfield

movethesection7.1.3.5aHTControlfieldtopage8line40

EDITORTOAPPLYCHANGE

MAC

100

7.1.3.5a

6

1~5

TR

Figure7-4eonlycontainsB1-B31.FortheintegralityofVHTControlfield,weproposetoaddB0inthefigure.

AddB0intheFigure7-4e.Thecontentcanbe"HT/VHT=1".

Agree.Asincomment,NameisVHT

MAC

CommentsreferredtoSignallingofHTC

908

7.1.3.1.9

5

4

TR

from11n-2009specs"7.1.3.1.9Orderfield

TheOrderfieldis1bitinlength.Itisusedfortwopurposes:

—Whensetto1inanon-QoSdataframetransmittedbyanon-QoSSTA,itindicatesthattheframecontainsanMSDU,orfragmentthereof,whichisbeingtransferredusingtheStrictlyOrderedserviceclass.

—Whensetto1inaQoSdataormanagementframetransmittedwithavalueofHT_GForHT_MFfortheFORMATparameteroftheTXVECTOR,itindicatesthattheframecontainsanHTControlfield.

Otherwise,theOrderfieldissetto0."ThisdoesnotalllowforHTcontrolframeinaVHTPPDU

changelastbulletincludingtheVHTcase:

"Whensetto1inaQoSdataormanagementframetransmittedwithavalueofHT_GF,HT_MForVHTfortheFORMATparameteroftheTXVECTOR,itindicatesthattheframecontainsanHTControlfield.

Otherwise,theOrderfieldissetto0.

Agree.Asincomment

MAC

233

7.1.3.5a

5

27

TR

WhyhaveaVHTbitwhenaframetransmissioniseitherVHTorHTasindicatedbytheSIGNALfieldinthePHYpreamble?

Suggestremovingthisredundantbit.

AfterVHT-SIG/HT-SIGauto-detectiontheinformationaboutwhethertheframeisHTorVHTmaybepassedthroughRXVECTORfromPHYtoMAC.AlsoChange"Figure7-1--MACframeformat"accordingly.

SuggestremovingthisredundantHT/VHTbit.Change"Figure7-1--MACframeformat"showingHT/VHTcontrolfield.Inserttextindicating"HT/VHTcontrolfieldisaHTcontrolfieldoraVHTcontrolfielddependingonwhethertheMPDUisaHTMPDUorVHTMPDUrespectively."

RejecttheremovalofB0;ThebitB0isneededincaseofcontrolwrapper.Controlwrappercanbesentwithnon-HTPPDUs,inwhichcaseB0definesthetypeofthefield.

DiscussiononwhethertheVHTCcanbeinHTPPDUandviceversa;

MAC

Commentsreferredtocapabilityindications

907

7.1.3.5a

5

10

TR

ThereisnocapabilityindicationfortheHTControlfieldinthenewVHTformat.ASTAmaysupportHTCbutnotinthenewVHTformat,orviceversa,butthatcannotbeindicated

AddanewcapabilityindicationfortheHTcontrolfieldinthenewVHTformat;Whenenabled,thecapabilityindicatesthatSTAiscapableofreceivingaHTcontrolfieldwiththenewVHTformat;ASTAshallnotreceiveframeswithHTcontrolfieldintheVHTformat,unlessitdeclaresthecapabilityinVHTcapabilitiesinfoelement;ASTAshallnotreceiveframeswithHTcontrolfieldintheHTformat,unlessitdeclaresthecapabilityinHTExtendedcapabilitieselement（currentlycalled+HTCcapable）;VHTformatCapabilityinVHTcapabilitiesinfocanbeindicatedwith1bitinpositionB22;Section9.7aHTControlfieldoperationneedbeupdatedaccordingly;

Agree.Asinproposedresolution

MAC

Commentsreferredtoframe/fieldsformat

1234

7.1.3.5a

6

5

TR

FieldssuchasACContstraintarenotdefined.

Addthemtotable7-6h,perhapswith"seetable7-6a"asadefinition

Agree.Addedinthetable;descriptionpointstotheHTcase

MAC

1345

7.1.3.5a

7

58~64

TR

NeedtodescribehowtosetNsts,MCSandSNRfieldsintable7-6i.

Insertintable7-6i:

NstsfieldissettotrueNsts-1,MCSfieldissettoMCS,SNRfieldreferto（9-1）in9.18.3.

Agree.Addedreferencetosection9.18.3（LinkAdaptationusingtheVHTcontrolfield）,wheremoredetailsareprovided

MAC

885

7.1.3.5a

7

38

TR

TheunsolicitedfeedbackshouldrefertoSUorMUVHTPPDU

IftheUnsolicitedMFBsubfieldissetto1andtheFBTxTypesubfieldissetto1,theunsolicitedMFBreferstoabeamformedSU-MIMOorMU-MIMOVHTPPDU.

Reject.Accordingtodescriptionin9.18.3,FBTxTypesubfieldissetaccordingtotheBeamformedindicationinSIG-A2,whichonlyreferstoSUcase.ThereceiverofunsolicitedfeedbackcanusetheGID（LandH）todetermineiffeedbackisreferredtoanSUorMUPPDU

MAC

24

7.1.3.5a

7

58

TR

"Nsts"shouldbedefinedinsection3.2aswellas"MCS".

Insertthefollowingdefinitionsinsection3.2:

Nsts:

Thenumberofspace-timestreams.

Agree

MAC

966

12.3.5.10.2

65

1

TR

infigure7-4e,theonlyreservedbitisinposition29;Forhelpingthereceiverparsingincaseoffutureextensions,theposistionofthereservedbitshouldbewithinthefirstbyte;

Movethe'Solicited/unsolicited'bitinposition29andhaveB1tobereserved;modifytable7-6haccordingly;

Agree.Assuggested.Note:

Sectionofcommentwaswrong.Commentrefersto7.1.3.5a.

COEX

SomeEditorialcomments

1004

7.1.3.5a

7

38

ER

Grammer:

"IftheUnsolicitedMFBsubfieldissetto1andFBTxTypesubfieldissetto0,theunsolicitedMFBreferstoeitherunbeamformedVHTPPDU,transmitdiversityutilizingAlamouticodingVHTPPDU."

Changethesentenceto"IftheUnsolicitedMFBsubfieldissetto1andFBTxTypesubfieldissetto0,theunsolicitedMFBreferstoeitherunbeamformedVHTPPDUorVHTPPDUwithSTBC."

Agree.Assuggested.

Ed

1005

7.1.3.5a

7

40

ER

Theterminology'Alamouticoding'isnotusedinREVmb4.01.

Change'Alamouticoding'to'STBC'

Agree.Modifiedto"usinganSTBCVHTPPDU".

Ed

1353

7.1.3.5a

7

40

ER

"…..referstoeitherunbeamformedVHTPPDU,transmitdiversityutilizing….."What'sthegrammarthere?

Shouldn'tbe"either….or……"?

changeto""…..ReferstoeitherunbeamformedVHTPPDUortransmitdiversityutilizing….."

Agree.See#1004

Ed

1401

7.1.3.5a

7

40

ER

Theterminology'Alamouticoding'isnot