7/27/2019 LTE Poster

http://slidepdf.com/reader/full/lte-poster 1/1

LTE Evolved Packet System Architecture

LTE enables you to redefine the end-user experience

with the most advanced packet-based solution in

the industry. Continuing our 3G partnership into LTE,

the Alcatel-Lucent end-to-end LTE solution provides:

• A comprehensive transformation to an IPinfrastructure with minimal risk

• An open LTE ecosystem of devices, applicationsand content providers

• Smooth interworking with existing 2G/3G networksand evolution to the next generation  For more information, visit:

www.alcatel-lucent.com/LTEinfo

or call your Alcatel-Lucent representative.

• IMSarchitectureis describedin TS23.228

• IMSsupports VoIPon EV-DO,HSPA+and LTE

• SingleRadio VoiceCall Continuity (SRVCC) IMSsupports optimizedhandoff of calls between VoIPdomains andwireless circuitdomainsusingtheVoice CallContinuity (VCC) application server(TS23.216)

• IMScentralizedservices (ICS) (TS23.292) andservice centralization andcontinuity (SCC) (TS23.237) enableIMSservices foruser equipmentinthecircuit-switcheddomain

Circuit-switched (CS) fall back

IMS - Industry-standard service architecture

Mobility Management Entity (MME) functions• Non-Access Stratum(NAS) signaling(attachment,bearersetup/deletion)

• NASsignalingsecurity

• Signalingformobility between 3GPPaccess networks (S3)

• Idlemodeuser equipmentreachability

• TrackingArea listmanagement

• PDN gateway andservinggateway selection

• MME selection forhandoffs with MME change

• Roaming-s6a to homesubscriberserver (HSS)

•Authentication

•

Bearermanagementfunctions includingdedicatedbearerestablishment• SupportforEarthquakeand TsunamiWarningSystem(ETWS) messagetransmission

•Alcatel-Lucent9471 MME

 

User Equipment (UE) functions• Contains theUniversalSubscriberIdentity Module(USIM) which holds

authentication information

• Supports services andapplications

• Monitors radios andconveys performanceto theEvolved NodeB (eNB) channelquality indicator(CQI)

• Supports LTE uplinkanddownlink airinterface

• Maps upstreamtrafficinto trafficclasses thataredefinedby upstreamtrafficflow templates

Home Subscriber Server (HSS)• Storageof subscriberdata

• EnhancedPresenceService (EPS) QoSsubscriberprofile

• Roamingrestrictions list

•AccessibleAccess PointNames (APNs)

•Address of currentserving mobility managemententity (MME)

• CurrentTrackingArea (TA) of userequipment(UE)

•Authentication vectors andsecurity keys perUE

•Alcatel-Lucent8650 SubscriberData Manager

Policy and charging rules function (PCRF)• Interfaces with application functions such as theproxy-callsession controlfunction

(P-CSCF) orotherpolicy enabledapplications

• Interfaces with thePDN gateway to convey policy decisions to it

• Decides how services shallbetreatedin the PDN gateway in accordancewitha usersubscriberpolicy

•Alcatel-Lucent5780 DSC

PDN Gateway (P-GW)• PDN gateway

• Per-userpacketfiltering

• Lawfulintercept

• Userequipment(UE) IPaddress allocation

• Transportlevelpacketmarking fordownlinking

• Uplink/downlinkservicelevelcharging,gating, andrateenforcement

• Downlinkrateenforcement basedon aggregatemaximumbitrate (AMBR)

•Alcatel-Lucent7750 ServiceRouter

Serving Gateway (S-GW)• Localmobility anchorforinter-evolvedNodeB (eNB) handover

• Mobility anchorforinter-third-generation partnershipproject(3GPP) mobility

• EvolvedUMTSTerrestrialRadio Access Network(E-UTRAN) idle-modedownlinkpacketbufferingandinitiation of networktriggeredservice requestprocedure

• Lawfulintercept

• Packetrouting/forwarding

• Transportlevelpacketmarking (uplinkinganddownlinking)

•Accountingon userand Quality of Service(QoS) class identifiergranularityforinter-operatorcharging

• Uplinkanddownlinkc hargingperuser equipment,packetdata node(PDN),andQoSclass identifier(forroamingwith homeroutedtraffic)

•Alcatel-Lucent7750 ServiceRouter

Evolved Node B (eNB) functions• Radio resourcemanagement:radio bearercontrol,radio admission control,

connection mobility control,uplink/downlinkscheduling

• IPheader compression andcipheringof userdata stream

• Mobility managemententity (MME) selection

• Forwardinguplinkdata to servinggateway

• Paging

• Schedulingandtransmission of broadcastinformation,originatedfrom themobilitymanagemententity (MME) oroperations andmaintenance(O&M)

• Measurementandmeasurementreportingconfiguration formobility andscheduling

• Schedulingandtransmission of Earthquakeand TsunamiWarningSystem(ETWS)messages,originatedfromthe MME

EPS BEARER (36.300, CLAUSE 13.1) :

• Evolvedpacketswitch (EPS) bearer(36.300,clause13.1):

•An EPSbeareris an end-to-endtunneldefinedto a specificQoS

-A defaultbeareris definedattheuser equipmentinitialattach;radio resources areremovedif theuserequipmentgoes idle

-A dedicatedbeareris createdusingsignalingfor specificservices

• TheQoS modelis builton theEPSbearer which has fourparameters associatedto it:

-QoS class identifier(QCI) is an integerwhich provides an index into a tableprovidingforwardingtreatmentforthat bearer(in terms of latency andpacketloss)

-Allocation andretention priority (ARP) is usedby thescheduler to providepreemption

priority in caseof contention-GuaranteedBit Rate(GBR):separately forboth downlinks anduplinks.

Notean EPS-bearercan benon-GBR

-AggregateMaximumBit Rate(AMBR) specifies downlinkanduplinkbit rates foran aggregateEPS bearer

• Servicedata flows (SDF) arespecificpacketflows identifiedby quintupleandassociatedto a servicerequiringspecialtreatment

• SDFs aremappedinto EPSbearers atthe userequipment(for uplinks) andatthe PDNgateway (fordownlinks) usinga setof filterrules called trafficflow templates (TFT).

PCRF (TS 23.203):

• Policy rule

-Applies a filter(TFT) to mapSDFs to EPSbearers

-Provides charginginstructions

• Extremely flexiblemodel

-Dynamicpolicy control

-Policy push:Userequipment <>application signalingdetermines which SDFsto useandwhat policy ruleto installusingthePCRF on thePDN gateway

-Policy pull:Thegateway detects an event which triggers notification to thePCRFto downloada policy rule

-Pre-definedpolicy rules-Roamingsupport,other AN support

• Chargingfunctions in PCRF

-Chargingcorrelation:binds uplinktraffic(perSDF) to IMSsignalinglayer(usefulforvolume metering,forexample)

• Chargingin PDN gateway andservinggateway (forroamers)

-Per SDF statistics collection basedon chargingrules providedby thePCRF

-Onlinecharging through diametercreditcontrol(Gz)

-Offlinecharging(Gy)

• OtherPDN gateway functions

-Gate control:allows ordisallows SDF

-Flow policing

-Markingflows

-Metering

-Application awareness through DPI

• Bearerbindingand eventreportingfunction (BBERF)

-Bearer bindingis thegenericprocedurefor associatinga bearerin theaccess to a SDF

-TS 23.402 and23.203 defines bearerbindingandeventreporting function (BBERF)to supportsituations wherea directpolicy interfaceis needed.

• CSFB is definedin TS23.272

• Dualmode2G/3G andLTE userequipmentis registeredin the2G/3Gcircuitdomain butis tunedand connectedto theLTE/EPCnetwork

•Voicecalls comeinto themobileswitching center(MSC)

• TheMSC alerts theuser equipmentof incomingvoice calls throughtheservinggateway interface,mobility managemententity (MME)andLTE.Note theS101 is usedin theevent theMSC is 3GPP2 (CDMA)

• Theuser equipmentretunes andreconnects to the2G/3G carrierandaccepts calls

• LTE data session is eithersuspendedoris handed to W-CDMA(if applicable- notshown above)

• SGs interfacecan also deliverSMStrafficto theuser equipmentwhenin LTE mode

LTE with legacy 3GPP interworking (pre-Release

LTE with legacy 3GPP interworking (Release 8)

LTE with non-3GPP interworking (Release 8)

TS 23.401, ANNEX D:

Utilizes new LTE elements to emulatelegacy elements for interworking

• Mobility managemententity (MME) supports Gn/Gpinterfaces(TS23.060) forthecontrolplane(based on GTPv1)

• PDN gateway needs to supportGn/Gpinterfaces (TS23.060) forthecontrolanduser planes.PDNgatewayalsoacts asaGGSN andcommonanchorforevolved packetcore(ePC) bearers andpacket data protocol(PDP) contexts.

An Lthroforth

RELEASE 8 METHOD OF INTERWORKING (TS 23.401, CLAUSE 5.5.2)

Therelease8 methodof inter-radio access technology (IRAT) interworkingrelies on using:

• New S3 andS4 interfaces,modeledon theS5 and S10 interfaces usedforS1 basedhandover,to supportsignalinganduser planerequirements

-A servingGPRSsupport node(SGSN) thatuses thenew interfaceiscalledan S3/S4 SGSN

•Aserving gateway as a mobility anchorfor intra-3GPPmobility

-Mobility managemententity (MME) <>SGSN handovers supportcallflows similarto thebasicS1-based handoverwith MME change(also describedin TS23.401)

Adv

• Offepack(HSP

• Comon a

• Supp

INTERWORKING WITH NON-3GPP ACCESS NETWORKS (TS 23.402):

Fundamentalgoal:Achievemobility with IPaddress preservation whenuserequipmentselects a non-3GPPaccess

Access types

• Trustednon-3GPPaccess —WiMAX andhigh ratepacketdata (HRPD)operatedby thesameprovider as LTE

-The operatorhas authenticatedusers forthe access network

-The operatorhas implementedsufficientsafeguards to mitigatepotentialattacks

• Untrustednon-3GPPaccess — third-party WLAN access(homeorbusiness) hotspot

-Theoperator requires separateauthentication procedures

-Example:WLAN access froma thirdparty (homeorbusiness) hotspot

Basi

• ThePsupp

• Thesacce

• TheAEvol

• Othesupp

• S101no p

REFERENCES ARE:

• TS33.401:SAE Security Architecture

• TS24.301:NAS Protocol

• TS36.323:PDCP Specification

INTERFACE

Gx

Gxa,GxbandGxc

Rx

S9

Sp

Gy/Ro

Gz/Rf 

Ga

PURPOSE

Policy control

BBERF as definedin TS23.402

Application function to PCRF

RoaminginterconnectforPCRF

Retrievingpersubscriber policy data

On-linecharging

Off-linecharging

Off-linecharging

PROTOCOL

Diameter/SCTP

Diameter/SCTP

Diameter/SCTP

Diameter/SCTP

Notspecified

Diameter/SCTP

Diameter/SCTP

GTP/UDP

REFERENCE

TS29.212

TS29.212

TS29.214

TS29.215

Notdefinedin R8

TS30.240 &TS32.299

TS32.251 & TS32.295

TS32.299

ForbTS33

LTE interworking opt

LTE security

Voice and SMS interworking options

www.alcatel-lucent.comAlcatel,Lucent,Alcatel-LucentandtheAlcatel-Lucentlogo aretrademarks of Alcatel-Lucent.Allothertrademarks aretheproperty of theirrespectiveowners.T

©2009 Alcatel-Lucent.Allrights reserved.RMK7526091004 (10)

S6a

S10

S5

S5/S8

S11

SGi

Rx

X2

S1-U

S1-U

S1-MME

S1-MMEGx

LTE-Uu

HSS

PDN

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 •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •  •

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A PPL ICA T IO N SCO RERANUE

MME

I MS A PP S

eNB

eNB P-GW

PCRF

S-GW

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•      •       •        • •

S1-mobility managemententity (MME):used forsignalingbetween theEvolvedNode B(eNB) andtheMME

S1-U:defines userplanebetween eNB andservinggateways

S10:usedby MMEs to supportMME changes

 

X2:used to supportintra-MME handoff with no packetloss

S11:used by theMME to controlpath switchingandbearerestablishmentin theservinggateway andPDN gateway

S6a:usedby theMME to retrievesubscriber data fromhomesubscriber server(HSS)

S5:a signalinginterfaceforestablishingbearers between theservinggatewayandthe PDN gateway orbetween servinggateways,forserving gateway changes(GTPv2).Italso supports theuserplanefor bearers (GTPv1).Note thereis a PMIPv6version of theS5.

Gx:used by thePCRF to convey policy enforcementto theP-GW,andalso usedtoretrievetrafficflow data.

 

SGi:theinterface into theIPPDN.This is wheretheIP visibility into theUE IPaddress(es)is exposed.

S8:analogous to theS5 exceptthatit is usedin roamingscenarios.

Rx:used by application functions,such as theIMS P-CSCF,to convey policy data tothePCRF.

EPCEU T RA N PD N

End-to-end service

EPSbearer

E-RAB S5/S8 bearer

External bearer

R ad io b ea re r S 1 b ea re r

eNBUE

LTE-UU S5-S8 SGiS1

SGW PGW PEERENTITY

HSS/HLR

S1-U

S11

S6a

Gr

Gn

Gn

Gn (IP/lu-PS)

lu-PS/Gb

Gn

S1-MME 

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UTRAN/ 

GERAN

HSS/HLR

S1-U

S11

S6a

S16

S10

S6d/Gr

Gn

S4

S12

lu-PS/Gb

S3

S1-MME

GERAN/ 

UTRAN

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UserPlane

L1/L2 Signaling

EPS AKA

eNB

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

• RRCSignalingIntegrity Protection (AESandSnow 3G)• RRCSignalingCiphering(Null,AES andSnow 3G)• UserPlaneCiphering(Null,AES, andSnow 3G)

• NASIntegrity Protection• NASCiphering(Null,AES, Snow 3G)

S5

S2a

S2b

STa

S6a

S6b

S11S1-MME

S103S101

trustednon-3GPP access

(EHRPD)

LTE basic nodes and interfaces

Bearer architecture LTE policy control and charging

EUTRAN

EHRPD

(trusted non-3GPP access)

WLAN(untrusted non-3GPP access)

UE

S9

Rx

Sp

S5

S2a

SGi

S2bGyRoGz/Rf

Gxc(PMIPv6 S5 only)

G xa G xb

Gx

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Application

Function

SPR

PDN

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PCRF

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PCRF

S6a

SpS10

S5/S8

SGsorS101 (forCDMA)

S11

SGi

Rx

X2

S1-U

S1-MME Gx

HSS

INTERNET

PSTN&Other

Networks

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A PPL ICA T IO N SEPCEUT RA NUE

•        •        

•        •        

•       

MME

APPSeNB

eNB

BTS

P-GW

PCRF

S-GW

MSC

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•      •       

•        • •

S6a

APPLICATIONSVoice Call Continuity

Telephony

Presence

SMS/IM

Voice MailSp

Sv

S11

SGi

Rx

Cx

Sh

Gm

S1-U

S1-MME

Gx

IP CORE

PSTN&Other

Networks

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IM SEPCEUT RA N

UT RA N /G ERA N

UE

MME

eNB

eNB

BTS/NB

P-GW

PCRF

S-GW

MSC

MGCF/ MGW

HSS

Session control

(CSCF)

Mediaserver

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(WLAN)ePDG

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OfCS

OCS• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

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  •

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P-GW

ePDG

HSGW

S-GW

MME

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

• • • • • • •• • • •

   •

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AN(e.g.HSGW)

P-GW

• • • • •

S-GWEUTRAN

   •

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    • 

   • 

   • 

   • 

   •

R8SGSN

S

MMEEUTRAN

• • • • • • • • • • • • • • •

MMEEUTRAN

• 

 • 

 • 

 • 

 • 

 • 

 • 

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• 

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• 

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •

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Gz/Rf