3G LTE & IMT-Advanced Serviceold.hsn.or.kr/hsn91-06/workshop/hsn2006/document/2.24.Fri/8-2.pdf · 3G LTE & IMT-Advanced Service HSN 2006 February 22-24, 2006 3G LTE & IMT-Advanced

3G LTE & IMT-Advanced ServiceHSN 2006

February 22-24, 2006

3G LTE & IMT3G LTE & IMT--Advanced ServiceAdvanced ServiceHSN 2006HSN 2006

February 22-24, 2006

Dr. Hyeon Woo Lee

Global Standards & Research SAMSUNG [email protected]

Samsung Electronics. Co. Ltd. 1/32

Contents

3G LTECurrent status Air interface technologies (focusing on 3GPP) Network architecture technologies (focusing on 3GPP)

IMT-Advanced Service


Contents




Mobile Communication Roadmap

Mobility

HighSpeed

LowSpeed

4 G4 G

802.11b

CDMA2000 EV-DO/DV

W-CDMA/HSDPA

2.4 GHzWLAN

802.11a/g

CDMA/GSM/TDMA

WPANHigh speed

WLAN

MediumSpeed

WiBro802.16e

Wi-Max5 GHz WLAN

Bluetooth

RFIDZigBeeMANet

1995 2000 2005

<100 Mbps~ 14.4 kbps <50 Mbps384 kbps144 kbps

AMPSETACSJTACSNMT PAN

Data Rates

2010+

1G( Analog )

2G( Digital )

3G( IMT2000 )

3G+

LTE in 3GPP/2


3GPP Roadmap

UTRAN Long-Term Evolution (LTE)

Workshop

(2004.11)

20012000 20032002 20052004 20072006 2008 2009 2010

Standard

Release99/4 Release 5 Release 6 Release 7

HSDPA EDCH

MBMSIMS

Release 99/4 system

Release 5/6 systemCommercial

LTE & SAE specifications- Improved packet service - Improved coverage- Reduced latency

Evolution system

PoC

WLAN I/W

UTRA-UTRAN Long Term Evolution Study Item (TSG-RAN): Air Interface

System Architecture Evolution Study Item (TSG-SA): Network Architecture


3GPP Long Term Evolution (LTE)

Evolution targetMax. data rate: 100 Mbps (downlink), 50 Mbps (uplink) @ 20 MHzImproved system throughputReduced user plane latency: less than 5msReduced control plane latency: less than 100msSupport of scalable system bandwidth: 1.25/2.5/5/10/15/20 MHz

LTE Schedule

FeasibilityStudy

122005

Study Item

63 6 9 12 32006 2007

6 9 12 3

Work Item

CoreSpecification

Requirement Decision

RAN-CN functional split Decision

RAN Architecture, Multiple access scheme Decision

Channel Structure, Mobility details Decision

Study Item TR ApprovalStage 2 Completion


3GPP Evolution – Air Interface

Major decisions made in December 2005Not support uplink macro diversity combiningDL OFDMA, UL SC-FDMA

Current statusWhole LTE concept evaluation to begin from March 2006Discussion on UL/DL multiple access details for evaluation

- Channel structure- Scheduling & link adaptation- Power control- Hybrid ARQ- Interference coordination/mitigation- Random access procedure- Cell search- MIMO, Channel Coding


3GPP Evolution – Network Architecture

Main objectivesRAN & CN architecture evolution for new air interface Support of heterogeneous access networks

- Mobility between heterogeneous access networks.

Current statusRAN Architecture

- Ciphering at anchor decided- Location of ARQ and RRC: either in Node B or Anchor (TBD)

Interworking with legacy 3G network (under discussion)- Direct connection with GPRS based 3G PS core; vs- IP based interworking (independent evolution of access

system)


3GPP2 Evolution Schedule

Phase 2

2007

1. Multi-Carrier EV-DO (CDMA)2. BW ≤ 20MHz (up to :15FAs)3. Peak data rate(3Mbps x N)

- FL: 45Mbps / RL: 30Mbps4. Publication : Feb, 2006

1. OFDM, MIMO, CDMA with FDE2. BW : ≤ 20MHz (1.25~)3. Peak data rate (20MHz)

- 100Mbps / 50Mbps4. Publication : April, 2007

2006

Phase 2 Framework Decision (2006-6)

Baseline Completion

Phase 2 Publication

Phase 1 Evolution Phase 2 Evolution

Phase 1 Publication

Phase 1


Framework proposal for Phase 2

Characteristics Pros & Cons

StrictlyBackward

Compatible(SBC)

Co-existing Legacy AT and new AT

FL: OFDMA and CDMA multiplexed in time slot

RL: CDMA or Hybrid OFDM-CDMA

- Smooth Migration from legacy system

- Performance loss due to backward compatibility

LooselyBackward

Compatible(LBC)

Legacy AT and new AT in separate carrier

Maximize reuse of existing upper layer

FL: OFDM / RL: OFDM-CDMA

- Optimized for broadband system

- Minimum backward compatibility

1. Lucent-Nortel-Samsung Proposal• Two modes (loosely and strictly backward compatible)• FDD (TDD TBD)

2. Nokia Proposal• Non-backward compatible OFDM FL (no RL details yet)• FDD


Contents

3G LTECurrent statusAir interface technologies (focusing on 3GPP) Network architecture technologies (focusing on 3GPP)



OFDMA-based Downlink (1)

BenefitsImproved link performance and spectral efficiencyEasier to employ spatial multiplexing (MIMO) Frequency domain scheduling and link adaptation providespossibility for improved spectral efficiencyImproved coverage and spectral efficiency for broadcast servicesthrough straightforward soft radio-link combiningFully scalable bandwidth modes to suit varying spectrum allocationsModerate receiver complexity for high bandwidth channel

DrawbacksIncreased Peak-to-Average Power Ratio (PAPR) not problem in Node B

up to 20 MHz



Frame and sub-frame configurationSub-frame duration corresponds to the minimum downlink TTI. Concatenation of multiple sub-frames into longer TTIs is FFS

- Improved support for lower data rates and QoS optimization- Increased complexity

one frame = 10 ms

a sub-frame = 0.5ms

…

… …

20 sub-frames

7 or 6 OFDM symbols



Transmission BW 1.25 MHz 2.5 MHz 5 MHz 10 MHz 15 MHz 20 MHz

Sub-frame duration 0.5 ms

Sub-carrier spacing 15 kHz

Sampling frequency 1.92 MHz(1/2 × 3.84 MHz) 3.84 MHz 7.68 MHz

(2 × 3.84 MHz)15.36 MHz(4 × 3.84 MHz)

23.04 MHz(6 × 3.84 MHz)

30.72 MHz(8 × 3.84 MHz)

FFT size 128 256 512 1024 1536 2048

Number of occupied sub-carriers†, †† 76 151 301 601 901 1201

Number of OFDM symbols per sub frame (Short/Long CP) 7/6

Short (4.69/9) × 6,(5.21/10) × 1*

(4.69/18) × 6,(5.21/20) × 1

(4.69/36) × 6,(5.21/40) × 4

(4.75/72) × 6,(5.21/80) × 1

(4.73/108) × 6,(5.21/120) × 1

(4.75/144) × 6,(5.21/160) ×1

Long (16.67/32) (16.67/64) (16.67/128) (16.67/256) (16.67/384) (16.67/512)

CP length (μs/samples)

†Includes DC sub-carrier which contains no data†† This is the assumption for the baseline proposal.

Somewhat more carriers may be possible to occupy in case of the wider bandwidth*: {(x1/y1) x n1, (x2/y2) x n2} means (x1/y1) for n1 OFDM symbols and (x2/y2) for n2 OFDM symbols

Numerology for evaluation



Modulation scheme: QPSK, 16QAM, 64 QAMDownlink Data multiplexing

Support both localized (block-wise) and distributed transmissionLocalized transmission

- Beneficial for frequency selective scheduling

Distributed transmission- Beneficial for high mobile speed and broadcasting of common

information



Reference signal (pilot) structureBaseline assumption: the second reference symbols always existTo be evaluated if the second reference symbols are needed

R1 : First reference symbol

D D D D D D D D D D D D D D D D D D D



D D D D R2 D D D D D R2 D D D D D R2 D D

D D D D D D D D D D D D D D D D D D


0.5 ms

Frequency domain

R2 : Second reference symbol D : Data

D R1 D D D D D R1 D D D D D R1 D D D D D

D



Channel coding and physical channel mappingHSDPA interleaver vs. circular buffer (as in cdma2000)Chunk-dependent modulation (baseline for evaluation) vs. chunk-independent modulation

Multiple transmit antenna techniquesMIMO: up to 4 × 4

- Spatial division multiplexing for a single user- Spatial division multiple access (SDMA) between multiple users

Open loop transmit diversityMacro Diversity

For unicast, the followings are being considered- Fast cell selection being considered- Downlink macro diversity for the cells of the same Node B

Soft combining for multi-cell broadcast signal- Need sufficient degree of inter-Node-B synchronization, at least

among a sub-set of Node B’s.



HARQ: IR including Chase combiningPower Control

Being investigated for physical/L2-control signalling channel, at least for tracking path loss and shadowing

Inter-cell interference mitigation Processing/coding gain in combination with cell-specific scrambling Receiver technologies suppressing inter-cell interferenceInter-cell-interference co-ordination/avoidance

UE measurements Channel quality of each resource block Adjustable time/frequency granularity of the CQI reportingInter-frequency and inter-RAT handover measurements periods

- To be created by the scheduler (no compressed mode)


SC-FDMA based Uplink (1)

Single-carrier transmission to reduce the PAPRTransmitter structure for SC-FDMA

Support of both localized and distributed transmissionLocalized transmission for frequency domain schedulingDistributed transmission to get frequency diversity gain

DFT Sub-carrier Mapping

CP insertion

Size-NTX Size-NFFT

Coded symbol rate= R

NTX symbols

IFFT



Sub-frame structureShort block for pilot or data symbol and long block for data symbolMinimum TTI is equal to the uplink sub-frame duration

- Concatenation of multiple sub-frames into longer uplink TTIsbeing considered

CP LB#1 CPCP SB#1

1 sub-frame = 0.5 msec

LB#6CP LB #2 CP LB #3 CP LB #4 CP LB #5 CP SB #2



Numerology for evaluation

SpectrumAllocation

(MHz)

Sub-frameDuration

(ms)

Long block size(μs/#of occupied

subcarriers /samples*2)

Short block size(μs/#of occupied

subcarriers /samples)

CP duration(μs/samples *1)

20 0.5 66.67/1200/2048 33.33/600/1024 (4.13/127) × 7,(4.39/135) × 1*

15 0.5 66.67/900/1536 33.33/450/768 (4.12/95) × 7,(4.47/103) × 1*

10 0.5 66.67/600/1024 33.33/300/512 (4.1/63) × 7,(4.62/71) × 1*

5 0.5 66.67/300/512 33.33/150/256 (4.04/31) × 7,(5.08/39) × 1*

2.5 0.5 66.67/150/256 33.33/75/128 (3.91/15) × 7,(5.99/23) × 1*

1.25 0.5 66.67/75/128 33.33/38/64 (3.65/7) × 7,(7.81/15) × 1*1



Modulation Scheme: QPSK, 16QAMUplink reference signal (pilot) structure being considered

Distributed (left) and localized (right) reference-signal structure

Reference-signal orthogonality in frequency domain (left) and “code” domain (right) respectively.

Frequency-domain staggering of the reference signals of SB2, relative to SB1

Reference signal #1 Reference signal #2 Reference signal #3 765 111098 141312

3028282726252423151413 1716 1918 2120 2212111098

765 111098 141312

DC subcarrier

Long Block

Short Block 1

Short Block 2



Multiplexing of L1/L2 control signaling and dataTDM is preferred by many companies due to concern on possible PAPR increaseFDM to prevent the link budget problem is FFS

Random access procedureTiming synchronizationNetwork access

SDMA support (e.g. virtual MIMO)PAPR-reducing modulation

E.g., π/4-QPSK, π/2-BPSK

SchedulingScheduling-based transmission for normal dataContention-based transmission at least for random access and scheduling request

Even symbols Odd symbols

π/4-QPSK π/2-BPSK



Power controlTransmission power control to compensate for at least path loss and shadowing Benefits and possible means for compensating also for fast (multi-path) fading to be investigated

HARQIR including Chase combiningSynchronous HARQ assumed, adaptive asynchronous HARQ is FFS

Uplink timing controlAlign uplink transmissions from multiple users within the cyclic prefix

Inter-cell interference mitigation Co-ordination/avoidance i.e. by fractional re-use of time/frequency resourcesInter-cell-interference randomization via scramblingFrequency domain spreading


Contents




【GTP routing】GGSN is needed in any case.

Enhanced Routing Based on IP Technology

IP based routing enables reduction of RTT delayExample proposal being discussed

S3G RNC??

GGSN

RNC

GTP routing IP routing

UE

AR (Router)

NodeB

3G RAN Architecture

【Optimum routing】Transmission via minimum route is possible.

New RAN Architecture?

More suitable for broadband

and ubiquitous

packet access

SGSN

NodeB

UEUE UE

NodeBNodeB

UEUE


Intelligent Node B with More Functionalities

Having more functionalities in Node B simplifies network architectureExample proposal being discussed

ALL IP NW

S3G Node B

IP

MAC/RRC

PHY

All basic functionfor operation

Ethernet

Radio NW

Multi-cellRRM/RRC

Inter-RATcontrol

In later stage, some upper layer functions can be added to improve system performance.

PHY


Restructuring of Network Elements

User plane and control plane separationOptimized routing and handling of user plane and control plane throughout the system (interfaces, network elements)Example proposal being considered

- Keep C-plane functions (e.g. mobility control) in RNC- “Direct U-plane” between “Intelligent Node B” and SGSN

Convergence of control nodesSimplified network architecture helps reduce latencyExample proposal being considered

- Merge RNC and SGSN into single node


Contents




Key features of IMT-Advanced

Key features of IMT-AdvancedConvergence among other mobile/wireless systems

- Provide seamless connection- Various Services & QoS satisfying users’ demand

What is different from 3G- Data rate: 100Mbps for high mobility, 1Gbps for low mobility- Provision of Similar degree of QoS to wireline communication

service- Global Roaming- Handover between Heterogeneous access networks - All IP network


Expected IMT-Advanced Service

Ubiquitous Network

HOMEOFFICE

TELEMATICS COMMERCE

HEALTH


Heterogeneous N/Ws for IMT-Advanced service

All IP N/W

3G/ WiBro/4G

Mobile

Hot Spot

WLAN/ Wi-MAX

Nomadic

AccessGatewaySoft Switch

Wireline

Ad-hoc N/W

MANet

OPEN API

Application Server

Sensor N/W


IMT-Advanced architecture

Thank you !Thank you [email protected]

Documents

3G LTE & IMT-Advanced Serviceold.hsn.or.kr/hsn91-06/workshop/hsn2006/document/2.24.Fri/8-2.pdf · 3G LTE & IMT-Advanced Service HSN 2006 February 22-24, 2006 3G LTE & IMT-Advanced