December 2016doc.: IEEE 802.11-16/1605r0
IEEE P802.11
Wireless LANs
Date: 2016-12-15
Author(s):
Name / Company / Address / Phone / email
Stephen McCann / BlackBerry Ltd / 200 Bath Road, Slough, Berkshire, SL1 3XE, UK / +44 1753 667099 /
4. General description
4.5Overviewoftheservices
4.5.9Interworkingwithexternalnetworks
Changeasfollows:
Anoverviewoftheinterworkingfunctionsaddressedinthisstandardisprovidedbelow:
Networkdiscoveryandselection
Discoveryofsuitablenetworksthroughtheadvertisementofaccessnetworktype,roamingconsortiumandvenueinformation,viaManagementframes
SelectionofasuitableIEEEStd802.11infrastructureusingadvertisementservices(e.g.,accessnetworkqueryprotocol(ANQP)oranIEEEStd802.21InformationServer)intheBSSorinanexternalnetworkreachableviatheBSS.
SelectionofanSSPNorexternalnetworkwithitscorrespondingIEEEStd802.11Infrastructure
Pre-associationdiscovery(PAD)
DiscoveryofservicesofferedbyaBSSoranexternalnetworkreachableviathatBSS
Emergencyservices
EmergencyCallandNetworkAlertsupportatthelinklevel
QoSmappingdistribution
SSPNinterfaceservicebetweentheAPandtheSSPN
Insertthefollowingnewclauses:
4.5.9.1Pre-associationdiscovery(PAD)
PADisaninterworkingfunctionprovidedbyaBSS(i.e.,anetwork)toallownon-APSTAs,inapre-associ-ationstate,todiscoverinformationconcerningservicesthatareavailabletoaSTAwhenitisassociatedwiththeBSS.
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Submissionpage 1Stephen McCann, BlackBerry
December 2016doc.: IEEE 802.11-16/1605r0
4.5.9.1.1Architecture
Figures 4-15a and 4-15b Figure 4-15a (Pre-association discovery architecture) showsthefunctionalflowofMACmessagingandserviceinformationbetweenaserviceinformationclient(SIC)andaserviceinformationregistry(SIR).Theseentitiesaredescribedbelow. The architecture differs within the infrastrucuture depenmdant upon whether unslicted or solicited PAD is being used.
Figure4-15a—Unsolicited PAD architecture
Pre-association discovery architecture
Figure 4-15b — Solicited PAD architecture
NOTE—AnSIRcanbeeitherco-locatedwiththeAPoroutsidetheAP.ThecommunicationsbetweentheSIRandtheAP,together with theSIR and theANQPserver areout ofthe scope of this document.
4.5.9.1.2Serviceinformationentities
SICand SIRare used to exchangeinformation betweenhigher layerresources aboveboth thenon-APSTAandtheAP.ThePADandserviceinformationproceduresoperatebetweentheSICandSIR.
TheSICandSIRareusedtotransportservicerelevantinformation(e.g.aservicename),andthenexchangethatinformationbetweentheSICandSIR.PADsignalingisopaquetotheservicerelevantinformationbecauseitishandledbytheseentitiesintheSTAandAPorPCP.
4.5.9.1.3Serviceinformationregistry
TheSIRcontainsinformationaboutservicesthatmightbereachablethroughBSS,fortheSTAtoconnecttoafteritassociateswiththeAP.Howtheserviceinformationregistryobtainstheinformationaboutservicesisoutsidethescopeofthisstandard.
ThereistypicallyoneSIRassignedtoeachESS.ItcanbeaddressedbyeachAPandeachservicewithinthatESS.ItincludessupportingservicediscoveryrequestsandresponsesfromtheBSS.
TheSIRcommunicateswiththeANQPservertorespondtoANQPrequests.
4.5.9.1.4Serviceinformationclient
TheSIC , also shown in Figure 4-15a (Pre-association discovery architecture), initiatesSTAservicediscov- ery.
WithinaSTAthisexchangeincludessupportingservicediscoveryrequestsandresponsestoandfromappli-cations.The SME determines whether to use unsolicited PAD, solicited PAD or serviceinformation proce-dures.TheSMEalsocreatesthecontentsoftheproberequestsandANQPrequests.
Submissionpage 1Stephen McCann, BlackBerry