TS 101 329-3 - V1.1.1 - Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON); End-to-End Quality of Service in TIPHON Systems; Part 3: Signalling and Control of end-to-end Quality of Service

46 Pages·0.39 MB·English

by  European Telecommunications Standards Institute

ETSI TS 101 329-3
V1.1.1
(2001-01)
TechnicalSpecification
Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON);
End-to-End Quality of Service in TIPHON Systems;
Part 3: Signalling and Control of end-to-end Quality of Service
2 ETSITS101329-3V1.1.1(2001-01)
Reference
DTS/TIPHON-05003
Keywords
internet,network,quality,service,signalling
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3 ETSITS101329-3V1.1.1(2001-01)
Contents
IntellectualPropertyRights..........................................................................................................................5
Foreword......................................................................................................................................................5
Introduction..................................................................................................................................................6
1 Scope..................................................................................................................................................7
2 References..........................................................................................................................................7
3 Definitionsandabbreviations..............................................................................................................8
3.1 Definitions..................................................................................................................................................8
3.2 Abbreviations..............................................................................................................................................8
4 QoSArchitecture................................................................................................................................9
4.1 TIPHONArchitecturalPlanes......................................................................................................................9
4.1.1 IPTelephonyApplicationPlane.............................................................................................................9
4.1.2 IPTransportPlane................................................................................................................................10
4.1.3 ManagementPlane...............................................................................................................................10
4.2 ServiceandTransportDomains.................................................................................................................10
4.2.1 End-to-EndQoSControl......................................................................................................................10
4.2.1.1 IPApplicationPlanecontrol...........................................................................................................11
4.2.1.2 TransportPlanecontrol...................................................................................................................12
4.3 QoSFunctionalElements..........................................................................................................................12
4.3.1 QoSServiceManager(QoSM).............................................................................................................12
4.3.2 QoSPolicyEntity(QoSPE)..................................................................................................................12
4.3.3 TransportResourceManager(TRM)....................................................................................................13
4.3.4 TransportPolicyEntity(TPE)..............................................................................................................13
4.3.5 InterconnectFunction(ICF).................................................................................................................13
4.3.6 TransportFunctionality(TF)................................................................................................................13
4.3.7 RelationshipbetweenFunctionalEntities..............................................................................................13
4.4 QoSReferencePoints................................................................................................................................14
4.4.1 ReferencepointQC1............................................................................................................................14
4.4.2 ReferencepointQC2............................................................................................................................14
4.4.3 ReferencepointQS4............................................................................................................................14
4.4.4 ReferencepointQT2............................................................................................................................14
4.4.5 ReferencepointQT1............................................................................................................................14
4.4.6 ReferencepointQI1.............................................................................................................................14
4.4.7 ReferencepointQI2.............................................................................................................................14
4.4.8 ReferencepointQI3.............................................................................................................................14
4.4.9 ReferencepointQI4.............................................................................................................................14
4.4.10 ReferencepointQI5.............................................................................................................................15
5 CharacterizingQoS...........................................................................................................................15
5.1 User,ApplicationandTransportLevelQoSParameters.............................................................................15
5.2 InterfacingtotheTransportPlane..............................................................................................................16
5.2.1 TransportQoSParameters....................................................................................................................16
5.2.2 TrafficDescriptor................................................................................................................................17
6 AllocatingtheQoSBudgetacrossServiceandTransportDomains...................................................18
6.1 DynamicsignallingofTransportQoSParameters......................................................................................19
6.2 SpecificationofTransportQoSParametersinServiceLevelAgreements...................................................19
6.3 Aggregation..............................................................................................................................................19
6.3.1 AggregationundercontroloftheTRM.................................................................................................19
6.3.2 AggregationundercontroloftheQoSM...............................................................................................19
7 QoSPrimitives.................................................................................................................................21
7.1 QoSPrimitives..........................................................................................................................................21
7.1.1 QC1&2................................................................................................................................................21
7.1.2 QS4.....................................................................................................................................................22
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7.1.3 QT2.....................................................................................................................................................22
7.1.4 QT1.....................................................................................................................................................22
7.1.5 QI1......................................................................................................................................................23
7.1.6 QI2......................................................................................................................................................23
7.1.7 QI3......................................................................................................................................................24
7.1.8 QI4......................................................................................................................................................24
7.1.9 QI5......................................................................................................................................................24
7.2 QoSParametersGroups.............................................................................................................................25
7.2.1 QoSparametergroups..........................................................................................................................25
7.2.2 QC1.....................................................................................................................................................26
7.2.3 QC2.....................................................................................................................................................26
7.2.4 QS4.....................................................................................................................................................26
7.2.5 QT2.....................................................................................................................................................27
7.2.6 QT1.....................................................................................................................................................27
7.2.7 QI1......................................................................................................................................................27
7.2.8 QI2......................................................................................................................................................27
7.2.9 QI3......................................................................................................................................................28
7.2.10 QI4......................................................................................................................................................28
7.2.11 QI5......................................................................................................................................................28
8 QoSProcedures(Informational)........................................................................................................29
8.1 ThirdPartyEstablishmentofQoSControlledBearer..................................................................................29
8.2 FirstPartyEstablishmentofQoSControlledBearer...................................................................................32
8.3 HybridThirdParty/FirstPartyEstablishmentofQoSControlledBearerviaauthorizationtokens................35
8.4 TerminalRegistration................................................................................................................................38
AnnexA(Informative): ExamplesofEnd-to-EndQoSControl......................................................39
A.1 Oneservicedomain/Onetransportdomain........................................................................................39
A.2 Oneservicedomains/multipletransportdomains-CaseI..................................................................40
A.3 Oneservicedomain/multipletransportdomains-CaseII..................................................................41
A.4 Multipleservicedomains/multipletransportdomains........................................................................42
A.5 Multipleservicedomains/multipletransportdomains........................................................................42
A.6 Roaming...........................................................................................................................................43
A.7 ProvisionedVPN..............................................................................................................................44
AnnexB(Informative): ExamplesofMappingofQoSArchitecture FunctionalElementsto
PhysicalElements......................................................................................45
History.......................................................................................................................................................46
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5 ETSITS101329-3V1.1.1(2001-01)
Intellectual Property Rights
IPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.Theinformation
pertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefound
inETSISR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIin
respectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWeb
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PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.Noguarantee
canbegivenastotheexistenceofotherIPRsnotreferencedinETSISR000314(ortheupdatesontheETSIWeb
server)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.
Foreword
ThisTechnicalSpecification(TS)hasbeenproducedbyETSIProjectTelecommunicationsandInternetProtocol
HarmonizationOverNetworks(TIPHON).
Thepresentdocumentispart3ofamulti-partdeliverablecoveringend-to-endQualityofServiceinTIPHONsystems,
asidentified:
Part1: "GeneralaspectsofQualityofService(QoS)";
Part2: "DefinitionofQualityofService(QoS)Classes";
Part3: "SignallingandControlofend-to-endQualityofService";
Part4: "QualityofServiceManagement";
Part5: "QualityofService(QoS)measurementmethodologies";
Part6: "ActualmeasurementsofnetworkandterminalcharacteristicsandperformanceparametersinTIPHON
networksandtheirinfluenceonvoicequality";
Part7: "DesignGuideforelementsofaTIPHONconnectionfromanend-to-endspeechtransmission
performancepointofview".
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Introduction
ThepresentdocumentformsoneofaseriesoftechnicalreportsandtechnicalspecificationsbyTIPHONWorking
Group5addressingaspectsofQualityofService(QoS)inTIPHONsystems.Thesedocumentsareallpartofasingle
documentTS101329,thestructureofwhichisillustratedinfigure1.
Part 1 Part 2
Introductions
Definition
General QoS
Definitions
of the 4 TIPHON
Explanations Aspects Class QoS Classes
Discussions...
of QoS Spec’
REPORT SPEC
Generic QoS Definitions
↑↑↑↑
Specific aspects of TIPHON QoS
↓↓↓↓
Part 3 Part 4 Part 5 Part 6 Part 7
QoS Actual Measure- Design
QoS
Manage- Test ment Guide-
Control
ment Results Methods lines
SPEC SPEC REPORT SPEC REPORT
QoS Control Reporting on Repository of Measurement Useful Info for
Framework QoS Achieved Real Results Methodologies Designers
Figure1:TIPHONWG5QoSdocumentationstructure
Thepresentdocumentdescribesaframeworkforthesignallingandcontrolofend-to-endQualityofServicein
TIPHONSystems
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1 Scope
Thepresentdocumentdescribesaframeworkforenablingtheend-to-endQoSlevelsdefinedinTS101329-2[2]tobe
signalledandcontrolledinTIPHONsystems.ThemechanismsinvolvedoperatebetweenTIPHONterminals,IP
telephonyServiceProviders(IPTSPs),andnetworktransportsystems,andprovideaflexiblemeansforthedynamic
allocationofQoSparametersacrosstheseentitiesinordertomeettheQoSServiceClassesdefinedinTS101329-2[2].
ThefunctionalentitiesinvolvedintheQoSsignallingandcontrolaredefined,asaretherequirementsofthereference
pointsbetweenthesefunctionalentities.TheQoSparametersandinformationflowsusedtoestablishtherequireduser
QoSlevelsarealsospecified.
TheApplicationPlanemechanismsdescribedinthepresentdocumentareintendedtobeindependentofthetransport
QoSmechanismsusedwithintheunderlyingIPnetworks.
TheemphasisofthepresentdocumentisonmediaQoS(primarilyvoice,butthemechanismsarealsoapplicableto
othermediatypes).Issuesrelatedtoperformanceofthesignallingchannelsareoutsidethescopeofthepresent
document.
ThepresentdocumentdescribeshowthisQoSframeworkfitsintotheoverallTIPHONarchitectureanddetailsofthe
signallinginvolvedaredescribedinTS101471[4].
2 References
Thefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresent
document.
• Referencesareeitherspecific(identifiedbydateofpublicationand/oreditionnumberorversionnumber)or
non-specific.
• Foraspecificreference,subsequentrevisionsdonotapply.
• Foranon-specificreference,thelatestversionapplies.
[1] ETSITS101329-1:"TelecommunicationsandInternetProtocolHarmonizationOverNetworks
(TIPHON);End-to-EndQualityofServiceinTIPHONSystems;Part1:Generalaspectsof
QualityofService(QoS)".
[2] ETSITS101329-2:"TelecommunicationsandInternetProtocolHarmonizationoverNetworks
(TIPHON);End-to-EndQualityofServiceinTIPHONSystems;Part2:DefinitionofQualityof
Service(QoS)Classes".
[3] ETSITS101314:"TelecommunicationsandInternetProtocolHarmonizationOverNetworks
(TIPHON);Networkarchitectureandreferenceconfigurations;TIPHONRelease2".
[4] ETSITS101471:"TelecommunicationsandInternetProtocolHarmonizationOverNetworks
(TIPHON);SignallingforcallsbetweenanH.323terminalsandterminalsinaSwitched-Circuit
Network(SCN);PhaseIII:Scenario1,2,3,and4".
[5] IETFRFC1633(06/94).IntegratedServicesintheInternetArchitecture:AnOverview".Braden
R.,Clark,D.,Shenker,S.
[6] IETFRFC2205(09/97):"ResourceReSerVationProtocol(RSVP)-Version1Functional
Specification".Braden,R.,etal.
[7] IETFRFC2210(07/97)"TheUseofRSVPwithIETFIntegratedServices".Wroclawski,J.
[8] IETFRFC2475(12/98)."AnArchitectureforDifferentiatedServices".Blake,S.,Black,D.,
Carlson,M.,Davies,E.,Wang,Z.,Weiss,W.
[9] IETFdraft-ietf-mpls-arch-07.txt."MultiprotocolLabelSwitchingArchitectures".Rosen,E.C.,
Viswanathan,A.,Callon,R.
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3 Definitions and abbreviations
3.1 Definitions
Forthepurposesofthepresentdocument,thefollowingtermsanddefinitionsapply:
IPTelephonyServiceProvider(IPTSP):businessentityprovidingIPTelephonyServices
InterconnectFunction(ICF):functionalEntitythatinterconnectstransportdomainswithentitiesoutsideofthe
transportdomain.Itpolicesauthorizedmediaflowsbetweentwotransportdomainstoensuretheyareconsistentwith
theQoSpolicyspecifiedbytherelevantmanager
QualityofServiceManager(QoSM):functionalentitythatmediatesrequestsforend-to-endQoSinaccordancewith
policydeterminedbytheQoSPE.Itcommunicateswith,otherQoSMsandwithTRMstodetermine,establishand
controltheofferedQoS
QualityofServicePolicyElement(QoSPE):functionalentitythatmanagesIPTelephonyQoSpoliciesandprovides
authorizationofpermittedanddefaultQoSlevels.ItreceivesrequestsfromandissuesresponsestoQoSMstoestablish
theauthorizedend-to-endQoSlevels
servicedomain:functionalentityrepresentingthedomainofcontrolofanIPTelephonyServiceProvider
TransportDomain(TD):functionalentityrepresentingacollectionoftransportresourcessharingacommonsetof
policiesandQoSmechanismsandundercommonadministrativecontrol
transportnetwork:collectionoftransportresourceswhichprovidetransportfunctionality
transportnetworkoperator:businessentityoperatingaTransportNetwork
TransportPolicyEntity(TPE):functionalentitythatmaintainsthepoliciesofaTransportDomain
TransportResourceManager(TRM):functionalentitythatappliesasetofpoliciesandmechanismstoasetof
transportresourcestoensurethatthoseresourcesareallocatedsuchthattheyaresufficienttoenableQoSguarantees
acrossthedomainofcontroloftheTRM
TransportFunctionality(TF):functionalentityrepresentingthecollectionoftransportresourceswithinaTransport
DomainwhicharecapableofQoScontrol
UserEquipment(UE):functionalentityrepresentingthedomainofcontrolofanIPTelephonyEndUser
3.2 Abbreviations
Forthepurposesofthepresentdocument,thefollowingabbreviationsapply:
ATM AsynchronousTransferMode
DiffServ DifferentiatedServices
GSM GlobalSystemforMobilecommunications
ICF InterConectFunction
ISDN IntegratedServicesDigitalNetwork
IP InternetProtocol
IPTSP IPTelephonyServiceProvider
IntServ IntegratedServices
MPLS MultiProtocolLabelSwitching
PSTN PublicSwitchedTelephoneNetwork
QoS QualityofService
QoSM QualityofServiceManager
QoSPE QualityofServicePolicyElement
RSVP ResourceReservationSet-UpProtocol
RTP Real-TimeTransportProtocol
SCN SwitchedCommunicationsNetwork
SLA ServiceLevelAgreement
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TCP TransmissionControlProtocol
TD TransportDomain
TF TransportFunctionality
TPE TransportPolicyElement
TRM TransportResourceManager
UDP UserDatagramProtocol
UE UserEquipment
VoIP VoiceoverIP
4 QoS Architecture
4.1 TIPHON Architectural Planes
TheGeneralizedTIPHONArchitectureisshowninfigure2(seeTS1013143]).
e
n SCN Plane
a
Pl
t
n
e
m
e
g
na Transport plane
a
M
Transport plane
IP TelephonyApplication Plane
IPTransportPlane
Figure2:GeneralizedTIPHONArchitecture
End-to-endQoSsignallingandcontrolwillingeneralinvolveQoSinformationflowsineachofthearchitectural
planes.
TheRequiredend-to-endQoSlevelsareestablishedwithintheIPTelephonyApplicationPlanebetweenEndUsersand
ServiceProvider(s)anddecisionsdeterminingQoS,specifictotheapplication,willtakeplaceintheIPTelephony
ApplicationPlane(e.g.codectype,packetizationetc).
TheIPTransportPlane(IPNetworkOperators)providesaQoSservicetotheApplicationPlane(ServiceProviders).
QoScontrolwithintheIPTransportPlaneistheresponsibilityoftheIPNetworkOperators.
4.1.1 IP Telephony Application Plane
Withinthisplane,QoSparametersspecifictotheapplicationarerequested,authorized,signalled,controlledand
accounted.
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4.1.2 IP Transport Plane
Withinthisplane,generalnon-applicationspecificparameterseffectingQoSmustbecontrolledandaccountedto
achievetheQoSrequirementsrequestedbytheapplication.
4.1.3 Management Plane
WithinthisplaneQoSmanagemententitiesapplicabletobothapplicationandtransportplaneswillresideand
informationflowsapplicabletoQoSmanagementwillterminate.
4.2 Service and Transport Domains
ATIPHON-compliantdeploymentwillinthegeneralcasebemadeupofanumberofseparateServiceDomains,each
representingthedomainofcontrolofanEnd-UserorIPTSP.ThesedomainswillgenerallyberestrictedtoIP
TelephonyApplicationplanefunctionality.e.g.,gatekeepers,softswitches,callagents,etc.
Similarly,aTIPHON-compliantsystemwill,ingeneral,alsobemadeupofanumberofseparateTransportDomains.
TransportDomainsconsistsolelyoftransportrelatedfunctionality;thisincludesIProutersandswitches,firewallsetc.
EachTransportDomainmayhaveitsownQoSpoliciesand/ordifferfromotherdomainsintermsofadministrative
control(e.g.NetworkOperator),QoSmechanisms(RSVP/IntServ,DiffServ,MPLS),access,metering,addressing
schemes(global,local)andtransportprotocol(IPv4,IPv6),etc.
Sincethesepoliciesarelocal,functionalentitiesareneededtointerfacetootherdomains.Theseentitiesarecalled
InterConnectFunctions.
ThegeneralTIPHONdeploymentisillustratedinfigure3.
4.2.1 End-to-End QoS Control
End-to-endQoScontrolacrossmultipledomainsmaybeachievedinoneoftwoways:
a) ByhavinganIPTelephonyApplicationServiceDomaincontroleachTransportDomain.TheServiceDomain
wouldrequestthetransportresourceswithQoSfromeachoftheTransportDomainsandestablishthe
interconnectinacontrolledfashion.
b) Bymeansofend-to-endsignallingwithinandbetweenTransportDomainswhichsharecommonpolicies.
Thesetwomechanismsareexplainedbelow.
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