1111040000000smacsyncbeaconresolutiontext.docx

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1111040000000smacsyncbeaconresolutiontext

IEEEP802.11

WirelessLANs

MACsyncbeaconresolutiontext

Date:

2011-03-15

Author（s）:

Name

Company

Address

Phone

Email

KazuyukiSakoda

SonyCorporation

5-1-12Kita-Shinagawa,Shinagawa-ku,Tokyo,141-0001Japan

+81-3-5448-4018

KazuyukiA.Sakoda（at）

Abstract

ThisdocumentprovidessuggestedresolutionstoM-BScomments.

Summaryoftheintentionofthisdocument

1.ResolvesomeofthecommentsinM-BScategoryasshownin11-11-0399（MACbeaconsynccommentresolutionxls）

Suggestedchangestothedraftspec

Applythefollowingchanges.

CorrespondingchangestoD9.0areindicatedinthefollowingtextwith“TrackChanges”on,toclarifythedirectiontotheeditor.Pleaseupdatethepartindicatedbythe“TrackChanges”only.

7.3Managementframebodycomponents

7.3.2Informationelements

7.3.2.98MeshConfigurationelement

7.3.2.98.1General

TheMeshConfigurationelementshowninFigure 7-95o130（MeshConfigurationelementformat）isusedtoadvertisemeshservices.ItiscontainedinBeaconframesandProbeResponseframestransmittedbymeshSTAs,andisalsocontainedinMeshPeeringOpenandMeshPeeringConfirmframes.

Element

ID

Length

ActivePathSelection

ProtocolIdentifier

ActivePathSelection

MetricIdentifier

Congestion

Control

ModeIdentifier

SynchronizationMethodIdentifier

AuthenticationProtocolIdentifier

MeshPeeringProtocolIdentifier

MeshFormationInfo

MeshCapability

Octets:

1

1

1

1

1

1

1

1

1

1

Figure7-95o130—MeshConfigurationelementformat

TheElementIDissettothevaluegiveninTable 7-26（ElementIDs）forthiselement.

TheLengthfieldissetto8.

Theremainderofthefieldsaredescribedinthefollowingsubclauses.

7.3.2.98.5SynchronizationMethodIdentifier

TheSynchronizationMethodIdentifierfieldindicatesthesynchronizationmethodthatiscurrentlyactivatedintheMBSS.Table 7-43bj4（SynchronizationMethodIdentifiervalues）providesthesynchronizationmethodidentifiervaluesdefinedbythisstandard.

Table7-43bj4—SynchronizationMethodIdentifiervalues 

Value

Meaning

0

Reserved

1

NeighborOffsetSynchronizationmethoddefinedin11C.12.2.2（NeighborOffsetSynchronizationmethod）（defaultsynchronizationmethod）

2–254

Reserved

255

Vendorspecific

（TheactivesynchronizationmethodisspecifiedinaVendorSpecificelement）

TheNeighborOffsetSynchronizationmethodisdefinedasthedefaultsynchronizationmethodamongmeshSTAs.ThedetailsoftheNeighborOffsetSynchronizationmethodaredescribedin11C.12.2.2（NeighborOffsetSynchronizationmethod）.

WhentheSynchronizationMethodIdentifierfieldis255,theactivesynchronizationmethodisspecifiedbyaVendorSpecificelementthatispresentintheframe.ThecontentoftheVendorSpecificelementisbeyondthescopeofthisstandard.（See7.3.2.26.）

7.3.2.98.9MeshCapability

TheMeshCapabilityfieldcomprisesasetofvaluesindicatingwhetherameshSTAisapossiblecandidateformeshpeeringestablishment.ThedetailsoftheMeshCapabilityfieldareshowninFigure 7-95o132（MeshCapabilityfield）.

B0

B1

B2

B3

B4

B5

B6

B7

AcceptingAdditionalMeshPeerings

MCCASupported

MCCAEnabled

Forwarding

MBCAEnabled

TBTTAdjusting

MeshPowerSaveLevel

Reserved

Bits:

1

1

1

1

1

1

1

1

Figure7-95o132—MeshCapabilityfield

TheAcceptingAdditionalMeshPeeringssubfieldissetto1ifthemeshSTAiswillingtoestablishadditionalmeshpeeringswithothermeshSTAsandsetto0otherwise（i.e.,theAcceptingAdditionalMeshPeeringssubfieldissetinaccordancewithdot11MeshAcceptingAdditionalPeerings）.

TheMCCASupportedsubfieldissetto1ifthemeshSTAimplementsMCCAandsetto0otherwise（i.e.,theMCCASupportedsubfieldissetinaccordancewithdot11MCCAImplemented）.

TheMCCAEnabledsubfieldissetto1ifthemeshSTAisusingtheMCCAandsetto0otherwise（i.e.,theMCCAEnabledsubfieldissetinaccordancewithdot11MCCAActivated）.

TheForwardingsubfieldissetto1ifthemeshSTAforwardsMSDUsandsetto0otherwise（i.e.,theForwardingsubfieldissetinaccordancewithdot11MeshForwarding）.

TheMBCAEnabledsubfieldissetto1ifthemeshSTAisusingMBCA,andissetto0otherwise（i.e.,theMBCAEnabledsubfieldissetinaccordancewithdot11MBCAActivated）.（See11C.12.4（MeshBeaconCollisionAvoidance（MBCA））.）

TheTBTTAdjustingsubfieldissetto1whiletheTBTTadjustmentprocedureisongoing,andissetto0otherwise.（See11C.12.4.4.3（TBTTscanningandadjustmentprocedure）.）

TheMeshPowerSaveLevelfieldandthePowerManagementfieldintheFrameControlfieldindicatethenon-peermeshpowermodeofthemeshSTA.ThePowerManagementsubfieldsetto1andtheMeshPowerSaveLevelfieldsetto0indicatethatthemeshSTAisoperatinginlightsleepmodefornon-peermeshSTAs.ThePowerManagementfieldsetto1andtheMeshPowerSaveLevelsetto1indicatethatmeshSTAisoperatingindeepsleepmodefornon-peermeshSTAs.TheMeshPowerSaveLevelfieldisreserved,ifthePowerManagementsubfieldissetto0.（See11C.13.2.2（Non-peermeshpowermodes）.）

7.3.2.105BeaconTimingelement

TheBeaconTimingelementisusedtoadvertisethebeacontiminginformationofneighborSTAs（meshSTAs,APs,orSTAsinanIBSS）.TheformatoftheBeaconTimingelementisshowninFigure 7-95o141（BeaconTimingelementformat）.

ElementID

Length

ReportControl

BeaconTiming

Information#1

...

BeaconTiming

Information#N

Octets:

1

1

1

6

...

6

Figure7-95o141—BeaconTimingelementformat

TheElementIDissettothevaluegiveninTable 7-26（ElementIDs）forthiselement.

TheLengthfieldindicatesthenumberofoctetsintheInformationfield（fieldsfollowingtheElementIDandLengthfields）.

TheReportControlfieldisusedtosignalinformationaboutthebeacontiminginformationtuplecontainedintheBeaconTimingelement.ThestructureoftheReportControlfieldisdefinedinFigure 7-95o142（ReportControlfield）.

StatusNumber

BeaconTiming

ElementNumber

MoreBeaconTimingElements

Bits:

4

3

1

Figure7-95o142—ReportControlfield

TheStatusNumbersubfieldissettothestatusnumberofthebeacontiminginformationset.Thestatusnumberismanagedasdescribedin11C.12.4.2.1（Maintenanceofthestatusnumber）.

TheBeaconTimingElementNumbersubfieldisanunsignedintegerthatindicatestheindexofthebeacontiminginformationtuplecontainedinthisBeaconTimingelement.TheBeaconTimingElementNumberissetto0intheBeaconTimingelementforthefirstoronlytupleofthebeacontiminginformationandisincrementedbyoneforeachsuccessivetupleofthebeacontiminginformation.Thebeacontiminginformationtuplesaremanagedasdescribedin11C.12.4.2.4（Transmitter’sprocedure）.

TheMoreBeaconTimingElementsubfieldissetto1ifasuccessivetupleofbeacontiminginformationexists,andsetto0otherwise.

TheBeaconTimingInformationfieldcontainsthebeacontiminginformationofaneighborSTA.WhenthemeshSTAreportsmultiplebeacontiminginformation,multipleBeaconTimingInformationfieldsareincludedintheBeaconTimingelement.ThestructureoftheBeaconTimingInformationfieldisdefinedinFigure 7-95o143（BeaconTimingInformationfield）.

NeighborSTAID

NeighborTBTT

NeighborBeaconInterval

Octets:

1

3

2

Figure7-95o143—BeaconTimingInformationfield

TheNeighborSTAIDsubfieldisanunsignedintegerthatindicatestheidentificationoftheneighborSTAcorrespondingtothisbeacontiminginformation.WhenameshpeeringisestablishedwiththisneighborSTA,theMSBofthisfieldissetto0,andtherestofthisfieldissettothelast7digits（7LSBs）oftheAIDvalueassignedtothisneighbormeshSTA.WhenameshpeeringisnotestablishedwiththisneighborSTA,theMSBofthisfieldissetto1,andtherestofthisfieldissettothelast7digits（7LSBs,takingtheI/GbitastheMSB）ofthe48-bitMACaddressofthisneighborSTA.

NOTE—SincetheNeighborSTAIDsubfieldisprovidedinabbreviatedform,itispossiblethatthesameNeighborSTAIDvalueappearsinmultipleBeaconTimingInformationfields.

TheNeighborTBTTsubfieldisanunsignedintegerthatindicatesaTBTTofthecorrespondingneighborSTA,measuredinthelocalTSFtimerofthemeshSTA.Thevalueisindicatedinmultiplesof32µs.WhentheactivesynchronizationmethodistheNeighborOffsetSynchronizationmethod,theTBTTiscalculatedasdescribedin11C.12.4.2.2（CalculationofneighborSTA’sTBTT）.TheB5totheB28（takingtheB0astheLSB）ofthecalculatedTBTTarecontainedinthissubfield.

TheNeighborBeaconIntervalsubfieldisanunsignedintegerthatindicatesthebeaconintervalbeingusedbythecorrespondingneighborSTA.TheunitoftheNeighborBeaconIntervalsubfieldisTU.

DetailedusageoftheBeaconTimingelementisdescribedin11C.12.4.2（Beacontimingadvertisement）.

7.4Actionframeformatdetails

7.4.15MeshActionframedetails

7.4.15.1MeshActionfields

7.4.15.11TBTTAdjustmentRequestframeformat

TheTBTTAdjustmentRequestframeisusedtorequestaparticularneighborpeermeshSTAtoadjustitsTBTT.Thisframeistransmittedusingindividualaddresses.TheformatoftheTBTTAdjustmentRequestframeActionfieldisshowninTable 7-57v40（TBTTAdjustmentRequestframeActionfieldformat）.

Table7-57v40—TBTTAdjustmentRequestframeActionfieldformat 

Order

Information

Notes

1

Category

2

MeshAction

3

to（N_Info+2）

BeaconTimingelement

RepeatedN_Infotimes（N_Infoisanumberofbeacontiminginformation