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3GPP TSG SA Chairman3GPP TSG SA Chairman Stephen HayesStephen Hayes

3GPP System Architecture Evolution

ATIS LTE Conference January 26, 2009

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3GPP Directions

Radio Network Core Network

•Faster Data rates

•Decreased Latency

•High Cell Edge Throughput

•Spectrum Flexibility

•Access independence for services

•Standardized multimedia services

•Mobility and IP interworking for all accesses

FASTER

Wider Scope

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Continuous improvement of access technologiesProvision of services over any access network

Common Core network

GSM 900

3G HSPA

WLAN E-UTRANEDGE

GSM 1800

GPRS

GSM 1900

GSM ph.1 R97 R98 R99 Rel-5/6 Rel-6/7 Rel-8 and onwards

WiMAX?

?

Evolved RANS1

GERAN

UTRAN

GPRS CoreGb

Iu

S3

S8

S 2

S7 Rx+

Home EPC MME UP E

S6

Op. IPServ(IMS, PSS,etc.)

HomeInter ASAnchor

HSS

S6

non 3GPP WLAN

S4

S 2

vPCRF

S7

hPCRF

Visited Network

Home Network

S9

Visited EPC

Evolved RANS1 SGi

UTRAN

Iu

S3

S8

S 2

Rx+

Home EPC MME UP E

S6

Op. IPServ(IMS, PSS,etc.)

HomeInter ASAnchor

HSS

S6

non 3GPP WLAN

S 2

vPCRF

S7

hPCRF

Visited Network

Home Network

S9

* Color coding: red indicates new functional element / interface

3GPP Anchor

SGSN

S5a

From GSM to multi-access

Fixed

PacketCable

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Broadband Accesses They come in many flavors

xDSLFiber (PON & P2P) Fiber/VDSL2

Fixed WirelessHSPA/LTESatellite/TerrestrialUnlicensed (WiFi, etc)Others

Cable (DOCSIS2 3)

Fixedaccess

Fixed/nomadic wireless

Mobileaccess

WCDMA/HSPA

LTECDMA2000 EVDO

GSM/EDGE

The borderline between fixed and mobile is getting less clear

Mobile WiMax

Others

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3GPP Approaches to Multi-Access

Service Convergence using Common IMS

Session ConvergenceUsing Evolved Packet Core (EPC)

EPC

Transport

Mob

ility

Core Functions:

- IP session ctrl- Mobility support- Deep Packet Inspection- Security- Charging- Policy and Resource

control

Access inter-

working functions

RGW

Wirelineaccess

Wirelessaccess

Standard Services & IMS

Fixed Core Network

Transport

Mob

ility

Core Functions:

- IP session ctrl- Deep Packet Inspection- Security- Charging- Policy and Resource

control

RGW

Wirelineaccess

Wirelessaccess

Mobile Core Network

Core Functions:

- IP session ctrl- Mobility support- Deep Packet Inspection- Security- Charging- Policy and Resource

control

Wirelessaccess

Standard Services & IMS

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Service Convergence using IMS/Common IMS

Fixed Core Network

Transport

Mob

ility

Core Functions:

- IP session ctrl- Deep Packet Inspection- Security- Charging- Policy and Resource

control

RGW

Wirelineaccess

Wirelessaccess

Mobile Core Network

Core Functions:

- IP session ctrl- Mobility support- Deep Packet Inspection- Security- Charging- Policy and Resource

control

Wirelessaccess

Standard Services & IMS

Service Convergence

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IMS/Common IMS

1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

UMTS (3G) HSPA DL HSPA UL LTE

• IMS developed as part of 3GPP Rel 5 as an application development environment

– Encourage new applications to use environment– Greater operator policing than native SIP/SDP– Home control allowing customization

• IMS retargeted in Rel 7 for telephony replacement– Standardized multimedia suite developed– Optimizations to improve performance– Access independence

• Common IMS specified in Rel 8– Integration of IMS variants and requirements from 3GPP2, TISPAN, and Cablelabs

IMS MMTel Common IMS

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Internet

IP Multimedia Subsystem (IMS)• PS domain IP Multimedia service platform • Based on open IETF standards

– End to end IP (SIP)– Multi access

• GPRS, I-WLAN, fixed xDSL, Packet Cable defined• More access technologies to follow...

Circuit-switched network

(2G or 3G)IP MultimediaCore

PSTN

IP connectivity(GPRS, 3G,...)

Find & route to destination

User data

Any IP connectivity (3G, WLAN,...)

End-to-End IP services

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• 3GPP members, 3GPP2, WiMAX forum, ETSI TISPAN and CableLabs contribute to 3GPP common IMS specifications– Different requirements are supported in common implementation

• All IMS specifications are harmonized to 3GPP specifications– Common parts are defined in 3GPP specifications only

• Core IMS entities (CSCFs, AS, UE IMS client,...) + agreed common functions– Other organisations either reference or re-use 3GPP specification as it stands– Any changes or additions in the Common IMS area are made in 3GPP

• All 3GPP members can contribute on their favourite work items• Ongoing work initiated by 3GPP members, CableLabs, 3GPP2 and ETSI TISPAN

– The scope and coverage of Common IMS have been agreed by the SDOs• Common version of IMS specifications in Rel-8

– Business or architecture specific additions to 3GPP Common IMS are possible outside the agreed Common IMS area

Common IMS

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Multimedia Telephony Service• Multiple Simultaneous Media Streams

– Voice– Text– Video– File Transfer– Video/Photo/Audio Sharing

• Multimedia analogs of traditional PSTN supplementary services– Originating Identification Presentation (OIP)– Originating Identification Restriction (OIR)– Terminating Identification Presentation (TIP)– Terminating Identification Restriction (TIR)– Malicious Communication IDentification (MCID)– Anonymous Communication Rejection (ACR)– Communication Diversion (CDIV)– Communication Waiting (CW)– Communication Hold (HOLD)– Communication Barring (CB)– Completion of Communications to Busy Subscriber (CCBS)– Message Waiting Indication (MWI)– Conference (CONF)– Advice Of Charge (AOC)– Explicit Communication Transfer (ECT)– Reverse charging– Closed User Group (CUG)– Three-Party (3PTY)

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But what if you need?

• Session Continuity• Mobility for non IMS applications• Common IP level services

– Filtering– Deep Packet Inspection– Firewall

• Common Management

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Session ConvergenceUsing Evolved Packet Core (EPC)

EPC

Transport

Mob

ility

Core Functions:

- IP session ctrl- Mobility support- Deep Packet Inspection- Security- Charging- Policy and Resource

control

Access inter-

working functions

RGW

Wirelineaccess

Wirelessaccess

Standard Services & IMS

Session Convergence

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Examples of non-IMS apps

• Multimedia Broadcast Messaging Service (MBMS)

• High Quality Audio• Packet Streaming

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• LTE = E-UTRAN = evolved radio network– Megabit class data rates– Short delays– Short transition from idle to active

• SAE = System Architecture evolution– SAE is the project name, the evolved network is called EPC– Evolved IP oriented multi access architecture

• E-UTRAN integrates only to SAE, A/Gb or Iu not possible• Strongly IP based PS only network• EPC covers both 3GPP and non-3GPP access technologies• Seamless roaming between E-UTRAN, 2G and 3G (tight interworking)• Loose interworking with non-3GPP accesses• GTP solution for intra-3GPP mobility and IETF based solution for

non-3GPP mobility– The main Architecture specifications 23.401 and 23.402 frozen in June 2008– Protocol work is ongoing and frozen with exceptions in December 2008

System Architecture Evolution (SAE)

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Convergence Using EPC

Evolved Packet Core

WirelineAccess

WirelessAccess

Partnerservices

Firewall/Security services

Content/Service filtering

QoS and Bandwidth mgmt

IP level service control

Uniform service/QoS treatmentAcross accesses and devices

Friends house

Roaming partner

OperatorServices

(e.g. IPTV, VoIP, ....)

• Mobility and ubiquity adds value to all services• Individualizing all services• Consistent experience across accesses and devices• Bundling different fixed, fixed wireless and mobile

subscriptions• Access and device awareness

default(per bundle)

individualized

Internet

Charging

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S6a

HSS

S8a

S3

S1-MME

S10

UTRAN GERAN SGSN

MME

S11

Serving Gatew ay UE

“ LTE - Uu ” E-UTRAN

S12

HPLMN VPLMN

PCRF

S7 Rx

+SGi •Operator’s IP

Services (e.g. IMS, PSS

etc.)

PDN Gatew ay

S1-U

S4

Mobility anchorPacket routing

Idle mode packet buffering & DL

initiationLegal interception

UE IP address allocationPacket screening & filtering

Policy enforcementCharging supportLegal interception

NAS signaling+sign. securityMobility between 3GPP ANs

Idle mode UE reachabilityP-GW and S-GW selection

SGSN selection at HOAuthentication

Bearer establishment

SAE architecture (23.401)

User planesecurity(UMTS AKA)

Signalingsecurity(UMTS AKA)

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Trusrted*Non-3GPP IP Access

or 3GPP Access

SGi

PCRF

S7

S6a

HSS

ePDG

S2b

Serving Gateway

Wn*

3GPP AAA Server

Operator’s IP Services

(e.g. IMS, PSS etc.)

Wm*

Wx*

UntrustedNon-3GPP IP

Access

TrustedNon-3GPP IP

Access Wa*

Ta*

HPLMN

Non-3GPP Networks

S1-U

S1-MME

EUTRAN

2G/3G SGSN

S4

S3

S5S6c

Rx+Rx+

S2a

PDN Gateway

MME S11

S10

UE

S2c

* Untrusted non-3GPP access requires ePDG in the data path

UE

Wu*

S2 for connectivity

via non- 3GPP acces

Trusted IP access directly

to P-GW

Untrusted IP access via

ePDG

SAE non-3GPP access (23.402)

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• Deployments are expected to start with overlapping cellular coverage– E-UTRAN overlapping with legacy 3GPP GERAN / UTRAN coverage– E-UTRAN overlapping with legacy 3GPP2 coverage– Multi-mode networks and terminals

• E-UTRAN is a packet-only radio with no CS capacity• Initially E-UTRAN is foreseen as “islands” in the sea of

legacy cellular access– Mobility between E-UTRAN and legacy access is required – Mobility between PS and CS domains is required– Multi-mode terminals expect to use PS coverage where available– Desire to keep the connectivity and services

SAE/LTE Deployment

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• Continuously Improving Security– EPC requires USIM (or non-3GPP equivalent)

• Multi-mode terminals and networks– Service continuity– Multiple registration– Voice Call Continuity– CS Fallback– Network selection

• Rel 9 will focus on– Regulatory enhancements to LTE/EPC– Home(e) NodeB enhancements to EPC

Other Improvements

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Summary – The 3GPP Access Onion

GPRSAccess

HSPAAccess

LTEAccess

CDMA2000

Access

WiMaxAccess

NGN (TISPAN)Access

WiFiAccess

CableAccessGPRS

PacketCore

Evolved Packet Core (EPC)

Common IMS

xDSLAccess

Integration of different accesses at different levels

FiberAccess

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Summary

• LTE is only part of what 3GPP works on• EPC (SAE) is the core network for LTE

…but• IMS and EPC (SAE) can be used to provide

service and session convergence across a variety of accesses

For further information: www.3gpp.org