3GPPLTEandSAEStephenhayes

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Workshop on ICT Technologies & Standards for NGN, 3G, and FMC

Nov 9-10, 2006 Brasilia, Brazil

3GPP Long Term Evolution (LTE)and System Architecture

Evolution (SAE)

Stephen Hayes

TSG SA [email protected]


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Introduction

3GPP Overview and Status

Radio Evolution (LTE) Overview and

Status Network Evolution (SAE) Overview and

Status


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What is 3GPP? 3GPP stands for 3rd Generation Partnership

Project It is a partnership of 6 regional SDOs

These SDOs take 3GPP specifications andtranspose them to regional standards

ITU references the regional standards

Japan

USA


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Structure of 3GPPProject Co-ordination Group

(PCG)

TSG RANRadio Access Networks

RAN WG1Radio Layer 1

specification

RAN WG2Radio Layer2 spec &

Radio Layer3 RR spec

RAN WG3lub spec lur spec lu spec &

UTRAN O&M requirements

RAN WG4Radio Performance &

Protocol Aspects

RAN WG5 (ex T1)Mobile Terminal

Conformance Testing

TSG SAServices &

System Aspects

SA WG1Services

SA WG2Architecture

SA WG3Security

SA WG4Codec

SA WG5Telecom Management

TSG CTCore Network& Terminals

CT WG1 (ex CN1)MM/CC/SM (lu)

CT WG3 (ex CN3)Interworking withExternal Networks

CT WG4 (ex CN4)MAP/GTP/BCH/SS

CT WG5 (ex CN5)OSA

Open Service Access

CT WG6 (ex T3)Smart Card

Application Aspects

TSG GERANGSM EDGE

Radio Access Network

GERAN WG1Radio Aspects

GERAN WG2Protocol Aspects

GERAN WG3Terminal Testing

GERAN WG3Terminal Testing


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3GPP Release Timeline

1999 2000 2001 2002 2003 2004 2005 2006

Rel 99 Rel 4 Rel 5 Rel 6 Rel 7 (target)

2007

WCDMA

IMS

I-WLAN

2008

MBMSMMS

MSCSplit

HSDPA HSPA+HSUPA

FBI


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3G Evolution Radio Side (LTE Long Term Evolution)

Improvements in spectral efficiency, user throughput,latency

Simplification of the radio network

Efficient support of packet based services: MBMS, IMS,etc.

Network Side (SAE System ArchitectureEvolution) Improvement in latency, capacity, throughput

Simplification of the core network Optimization for IP traffic and services

Simplified support and handover to non-3GPP accesstechnologies


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Evolution of 3GPP Radio Rates

Peak Network Data Rates

1

10

100

1000

10000

100000

GPRS EDGE WCDMA HSPA HSPA+ LTE

Technology

kbits/sec

UL

DL


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LTE (Long Term Evolution)

LTE focus is on:

enhancement of the Universal Terrestrial Radio Access(UTRA)

optimisation of the UTRAN architecture

With HSPA (downlink and uplink), UTRA will remain highlycompetitive for several years

LTE project aims to ensure the continued competitivenessof the 3GPP technologies for the future


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LTE Requirements (1)

Reduced cost per bit

Improve spectrum efficiency ( e.g. 2-4 x Rel6)

Reduce cost of backhaul (transmission in UTRAN)

Increased service provisioning more services at lower cost withbetter user experience

Focus on delivery of services utilising IP

Reduce setup time and round trip time Increase the support of QoS for the various types of

services (e.g. Voice over IP)

Increase cell edge bit rate whilst maintaining same sitelocations as deployed today

Increase peak bit rate (e.g. above 100Mbps DL and above50Mbps UL)

Enhance the bit rate for MBMS (e.g. 1-3 Mbps)

Allow for reasonable terminal power consumption


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Flexibility of use of existing and new frequency bands Allow to deploy in wider and smaller bandwidths than 5

MHz ( e.g. ranging from 1.25 to 20MHz)

Allow variable duplex technology within bands as well asbetween bands

Non-contiguous spectrum allocations to one UE should notbe precluded


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Architecture and Mobility

Need to consider UTRAN Evolution and UTRA Evolution at thesame time aiming at simplifying the current architecture

Shall provide open interfaces to support Multi-vendordeployments

Consider robustness no single point of failure

Support multi-RAT with resources controlled from the network

Support of seamless mobility to legacy systems as well as toother emerging systems including inter RAT Handovers andService based RAT Selection

Maintain appropriate level of security


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LTE Key agreements (1)

2 main issues have been investigated: The physical layer The access network internal architecture

Physical layer Downlink based on OFDMA

OFDMA offers improved spectral efficiency, capacity etc

Uplink based on SC-FDMA SC-FDMA is technically similar to OFDMA but is better suited for

uplink from hand-held devices (battery power considerations)

For both FDD and TDD modes(User Equipment to support both)

With Similar framing + an option for TD SCDMA

framing also Access Network consideration

For the access network it was agreed to get rid of the RNCwhich minimized the number of nodes


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LTE Architecture

eNB eNB

eNB

MME/UPE MME/UPE

S1

X2

X2

X2

EPC

E-UTRAN

EvolvedPacketCore

MME/UPE = Mobility Management Entity/User Plane Entity

eNB = eNodeB


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On the UTRAN Architecture the following working

assumptions were agreed in TSG RAN:

RRC Terminates in the eNode B

Outer ARQ terminates also in the eNode B

Currently Ciphering and integrity for signaling is

inside the eNode B while Ciphering for the User

plane is in the AGW


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LTE Key agreements (3) Requirements satisfaction

The LTE concept has the potential to fulfil both thesystem capacity and user throughput targets

Evaluated uplink peak data rate is a bit smaller than therequirements, however, it is expected that the peak datarate can be increased by some optimisations, e.g. higherTTI values and/or by reducing the amount of control

signalling information. It was confirmed that the requirements of C-plane and U-

plane latency can be satisfied. Fulfilments without any issues are identified for

requirements on deployment scenarios, spectrumflexibility, interworking, mobility, E-UTRAN architecture

and RRM.


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Regarding system and device cost and complexity workneeds to continue in the future. As evolved UTRA andUTRAN system will provide significantly higher datarates than Release 6 WCDMA and, as a consequence

hereof, the physical layer complexity will increaseaccordingly compared to lower-rate systems. Thiscomplexity is not seen as evolved UTRA and UTRANspecific, but is similar to the complexity experienced inany high data rate system.

According to these evaluation results, it can beconcluded that system concepts captured in this TR are

feasible for evolved UTRA and UTRAN. For Broadcast/Multicast services it is assume that

network synchronization will improve greatly theperformance


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Time schedule for LTE

LTE plan endorsed by 3GPP Project Co-ordination Group

Initial studies and work-plan creation to was almostcompleted in June 2006:

Generic Work Item created during the June meeting of TSGRAN

LTE Workplan created in September 2006

Completion foreseen in 2008

C S G G C


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SAE (System Architecture

Evolution) To ensure competitiveness of 3GPP systems for the next 10

years and beyond Optimization of the network for IP traffic and its expected

growth

Performance improvements reduced latency,

higher user data rates,

improved system capacity and coverage, and reduced overallcost for the operator.

Potential network and traffic cost reduction

Flexible accommodation and deployment of existing andnew access technologies with mobility by a common IP-based network

W k h ICT T h l i & S d d f NGN 3G d FMC


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3GPP SAE status Large number of active companies (30+)

Reasonable progress on 3GPP parts (including LTE support)

As of October 2006, SA has given a directive to SA2 to ensurethat LTE 3GPP access aspects can meet the time line requiredby 3GPP RAN

Some Key areas being addressed agreements remaining MME-UPE split or merged

3GPP anchor-SAE anchor split or merged

Interconnection/mobility for non-3GPP access technologies

Roaming aspects

PCC architecture & QoS model Simultaneous access to multiple data networks

Timeline

Report to be ready for SA plenary approval Dec 2006

Majority of Specifications to be ready end 2007/early 2008

First deployments planned for 2009

W k h ICT T h l i & St d d f NGN 3G d FMC


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LTE/SAE time planSA have drafted an overall SAE/LTE work plan to align the time

schedules of all applicable Working Groups

LTE parts

Study Item

Stage 1 Work Item

#33 #34 #35 #36 #37

2006 2007 2008

LTE parts

Non-LTE

#38 #39

Stage 2 Work Items

Stage 3 Work Items

Non-LTE parts

W k h ICT T h l i & St d d f NGN 3G d FMC


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Nov 9-10 2006 Brasilia Brazil

Summary

Extensive work ongoing to ensure future competiveness of3G systems

Improved performance

Simplified architecture

Optimized for IP traffic and services

Support for non-3GPP access technologies

Completion targeted in 2008

Study phase completing, specification phase starting

Further information at 3GPP web site (www.3gpp.org) LTE requirements study: 25.913

LTE architecture study: 25.912

SAE architecture study: 23.882
http://www.3gpp.org/http://www.3gpp.org/

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