111103780300accommentresolutionsoundingpollmimocontrolframe.docx
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111103780300accommentresolutionsoundingpollmimocontrolframe.docx
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111103780300accommentresolutionsoundingpollmimocontrolframe
IEEEP802.11
WirelessLANs
11acSoundingPollframeandVHTMIMOControlfields
Date:
2011-03-15
Author(s):
Name
Affiliation
Address
Phone
IllsooSohn
LGElectronics
LGR&DComplex533,Hogye-1dong,Dongan-Gu,Anyang-Shi,Kyungki-Do,431-749,Korea
+82-31-450-1882
illsoo.sohn@
DaewonLee
LGElectronics
LGR&DComplex533,Hogye-1dong,Dongan-Gu,Anyang-Shi,Kyungki-Do,431-749,Korea
+82-31-450-7897
daewon.lee@
YonghoSeok
LGElectronics
LGR&DComplex533,Hogye-1dong,Dongan-Gu,Anyang-Shi,Kyungki-Do,431-749,Korea
+82-31-450-1497
yongho.seok@
EunsunKim
LGElectronics
LGR&DComplex533,Hogye-1dong,Dongan-Gu,Anyang-Shi,Kyungki-Do,431-749,Korea
+82-31-450-1860
esun.kim@
DongwookRoh
LGElectronics
10225WillowCreekRd,SanDiego,CA92131USA
+1-858-386-8228
dongwook.roh@
SimoneMerlin
Qualcomm
5665MorehouseDr.,SanDiego,CA92121
1-858-845-1243
smerlin@
YongLiu
Marvell
5488MarvellLane,SantaClaraCA,95054
1-408-222-8412
yongliu@
Abstract
SubmissionforDraftP802.11ac_D0.1commentresolution.
Insoundingprocedures,VHTCompressedBeamformingReportfieldandMUExclusiveBeamformingReportfieldcangrowuptoapproximately26kByts,whichmakestheMMPDUofVHTCompressedBeamformingframebesegmentedandcarriedintheformofA-MPDU.ThisenablesadvancedfeaturessuchasselectiveretransmissionofsegmentsinaVHTCompressedBeamformingframetoincreasetransmissionefficiency.Inreturnforthat,thissubmissionprovidesmodifiedVHTMIMOControlfieldincludingnewsubfieldsforsegmentidentificationandmodifiedSoundingPollframeincludingnewsubfieldforindicationofselectivesegmentretransmission.Also,thesoundingprotocolregardingselectiveretransmissionofsegmentsisdescribed.
SubmissionaddressesDraftP802.11ac_D0.1technicalcomments28,32,141,222,763,914,1012,1243,1446,1474,223,764,1013,1121,1519,1079,1539,960,1194,919,1123,101,1124,and1125
Introduction
InterpretationofaMotiontoAdopt
AmotiontoapprovethissubmissionmeansthattheeditinginstructionsandanychangedoraddedmaterialareactionedintheTGacDraft.Thisintroductionisnotpartoftheadoptedmaterial.
EditinginstructionsformattedlikethisareintendedtobecopiedintotheTGacDraft(i.e.theyareinstructionstothe802.11editoronhowtomergethetextwiththebaselinedocuments).
TGacEditor:
Editinginstructionsprecededby“TGacEditor”areinstructionstotheTGaceditortomodifyexistingmaterialintheTGacdraft.Asaresultofadoptingthechanges,theTGaceditorwillexecutetheinstructionsratherthancopythemtotheTGacDraft.
SubmissionNote:
Notestothereaderofthissubmissionarenotpartofthemotiontoadopt.Thesenotesaretheretoclarifyorprovidecontext.
GeneralDiscussion:
Insoundingprocedures,VHTCompressedBeamformingReportfieldandMUExclusiveBeamformingReportfieldcangrowoverthelimitofthemaximumMPDUlimitofaSTA.ThefeedbackneedstobesegmentedinthiscaseandcarriedintheformofA-MPDU.
Asaworstcaseexample,when8x8MU-MIMO,160MHzbandwidth,subcarriergroupingof1,andmaximumresolutionquantizationof9and7isconsidered.ThesizeofVHTCompressedBeamformingReportfieldis26,216bytesAlso,thesizeofMUExclusiveBeamformingReportfieldis936.ThetotalsizeofBeamformingReportfieldis27,152bytes.AssumingthemaximumMPDUsizeof3,895bytesandconsideringotheroverhead,thenumberofsegmentationcangrowupto8.
Accordingtothecurrentdraft,atransmissionfailureinoneofthesegmentsinanA-MPDUresultsinentireretransmissionoftheVHTCompressedBeamformingframe,whichmakesthesoundingprocedureveryinefficientwhenlinkqualityisnotgood.Thus,theselectiveretransmissionofsegmentsinaVHTCompressedBeamformingframewouldbeaquitereasonablesolution.
Tosupportthis,thesegmentsinA-MPDUofVHTCompressedBeamformingframeneedtobeidentifiedindividually.ThiscanbesimplyaccomplishedbyintroducingnewfieldsforsegmentidentificationinaVHTMIMOControlfield.ThisnewfieldcanalsobeutilizedfortheindicationthataSTAdoesn’thaveavalidfeedback.Ontheotherhand,SoundingPollframedefinedin7.2.1.12mayincludenewadditionalfieldsforadvancedsoundingprocedures.Thus,anewfieldcanbeintroducedtoindicatetheselectionofsegmentsforretransmission.Consideringtheindividualindicationofsegmentswithminimumadditionaloverhead,abitmap-typedefinitionwouldbeefficientforthenewfield.
AbeamformercandeterminewhichsegmentisnotcorrectlyreceivedusingthesegmentidentificationinaVHTMIMOControlfieldofthereceivedVHTCompressedBeamformingframe.ThebeamformermayrequesttheretransmissionofallthesegmentsormayrequestonlytheselectedsegmentswhichhavenotcorrectlyreceivedusingsegmentretransmissionbitmapinSoundingPollframe.UponthereceptionoftheSoundingPollframewiththesegmentindication,aSTAmayfeedbackonlyselectedsegmentsinaVHTCompressedBeamformingframeorSTAmayretransmitallsegmentsinaVHTCompressedBeamformingframe.
ProposedResolution:
▶TRCID28and32:
ThecommentsarementioningamissingsubtypeofSoundingPollandNDPAframes.
▷ProposedResponse:
Agreeinprinciple.
28
7.2.1.11
9
12
TR
NDPAisacontrolframe;however,thereisnodefinitionofsubtypeinTable7-1andshouldbeadded.
AddanewsubtypeforNDPAinTable7-1.
32
7.2.1.12
10
29
TR
SoundingPollisacontrolframe;however,thereisnodefinitionofsubtypeforSoundingPollframeinTable7-1.
AddanewsubtypeforSoundingPollframeinTable7-1.
▶TRCID141,222,763,914,1012,1243,and1474:
ThecommentsarementioningmissinginstructionsonDurationfieldwhichisleftTBD.
▷ProposedResponse:
Agreeinprinciple.TheDurationfieldcanbesetasdescribedinClause7.1.4.2(asdescribedinIEEE802.11-11/0346)
141
7.2.1.12
10
37
TR
TheDurationfieldisnotdefined.
Changeto"TheDurationfieldissetasdefinedin7.1.4(Duration/IDfield(QoSSTA))."
222
7.2.1.12
10
37
TR
WhyisDurationfieldTBD?
Oncethesoundingsequenceisdefined,thedurationofthesequencecanbedetermined.
Definethedurationfield.
763
7.2.1.12
10
37
TR
AddsettingofDurationfield
ascomment
914
7.2.1.12
10
37
TR
TheDurationfieldissettoTBD.
Replacewith:
"Durationissetaccordingto7.1.4.2;Beamformershouldsetavaluelongenoughtoprotectthecompletionofthesoundingsequence"
1012
7.2.1.12
10
37
TR
TBDinDurationfield
Findappropriatefielddesign.
1243
7.2.1.12
10
37
TR
TherearetwoTBDsinthissubclause
un-tbdthem
1474
7.2.1.12
10
37
TR
Durationfieldcanbedecided.ThedurationfieldofSoundingPollusesamedurationprotectionwiththedurationofNDPA.IftheDurationfieldintheNDPAissettotheremainingdurationoftheTXOP,thedurationfieldinsoundingpollissettotheremainingdurationoftheTXOPtoo.IftheDurationfieldintheNDPAissettoaNAVvalueatreceivingSTAsthatprotectsuptotheendofanyfollowingframeplusanyadditionaloverheadframes,thedurationfieldinsoundingpollissettoaNAVvalueatreceivingSTAsthatprotectsuptotheendofanyfollowingframeplusanyadditionaloverheadframestoo.
DefinedtheDurationfieldasfollowing:
TheDurationfieldissettoasdefinedin7.1.4.
▶TRCID1446,223,764,1013,1121,1519,1079,1539,and960:
ThecommentsareanymentioningpossibleadditionalfieldinSoundingPollframewhichisleftTBD.
▷ProposedResponse:
Agreeinprinciple.Onesuggestionfromcommentsistoaddsegmentinformationtoenableselectiveretransmissionofsegments.Discussionsaregivenabove.MoredetailscanbefoundinIEEE802.11-11/0411.
1446
7.2.1.12
10
37
TR
IfthesoundingresponseissegmentedduetolimitsofMPDU,thesoundingpollframeshouldcontaininformationregardingsegmentinformation
resolveandfinalizedTBDfieldsofsoundingpollframe
223
7.2.1.12
10
44
TR
Definetheadditionalfields,ifany,inthesoundingpollframe.Ifthereisnoadditonalfield,removethestatement.
Asincomment
764
7.2.1.12
10
44
TR
Addthe"additionalfields"
ascomment
1013
7.2.1.12
10
44
TR
Incurrentspecification,aSoundingPollframemayincludesomeadditionalfieldstoimprovesoundingprocedures.Thefollowingisonesuggestionfortheusageofnewfields.
VHTCompressedBeamformingReportfieldcangrowuptoapproximately26Kbytes,whichislargerthanthemaximumallowedMPDUlimitformanagementframes.ThismakesaVHTCompressedBeamformingframeintheformofA-MPDU.SinceeachMPDUsintheA-MPDUcanbecheckedwithindividualFCSwhetherthetransmissionissuccessornot,selectiveretransmissionofonlyfailedsegmentsintheA-MPDUcanconsiderablyincreasethetransmissionefficiencyinsoundingprocedures.TosupporttheselectiveretransmissionofsegmentsinVHTCompressedBeamformingframe,anewinformationfieldwhichindicatesthetransmissionsuccessesorfailuresofindividualsegmentsneedtobeaddedinaSoundingPoll
frame.
AddanewSegmentInformationsubfieldintheSoundingPollframetosupportselectiveretransmissionofsegmentsinaVHTCompressedBeamformingframe.
1121
7.2.1.12
10
44
TR
"TheSoundingPollframemayincludeadditionalfieldsTBD."Thisseemstoallowimplementerstoaddfieldsatwill.
Deletestatement
1519
7.2.1.12
10
44
TR
TherecanbeanadditonalfieldforSoundingPoll.SinceVHTCompressedBeamformingReportmaybesegmentedinsomecases,selectiveretransmissi
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