lte roadmap

1

LTELTELTELTETechnologies, Roadmap and Technologies, Roadmap and

StrategiesStrategies

1Runcom Technologies Ltd.

12/11/2010 1

StrategiesStrategiesPeretz Shekalim

December 2010

Runcom

Contents

• 3GPP standardization activities• LTE Release 8 and 9• LTE-Release 10 and beyond (LTE-Advanced)• LTE-Release 10 and beyond (LTE-Advanced)• Details of some major features:

– CoMP– SON– Multicarrier

Relay


– Relay

• IEEE802.16m performance

33GPP GPP StandardisationStandardisationActivitiesActivities


3GPP Standardisation Process

ITU Recommendations

ITUExisting process Project Coordination Group

（PCG）

Technical Specification Groups （TSGs）

Partners

Organisational Partners（OP）

TTC, ARIB，ETSI,

TTA, CCSA, ATIS

Market Representation Partners（MRP）

Member companiesTechnical proposals and


Technical specifications

GSMA，TD-SCDMA Forum，

Femto Forum，CDG, etc

14 partners

Standardisation process in each OP

contributions

Local specifications

Source: © 3GPP 2009 <ITU-R WP 5D 3rd Workshop on IMT-Advanced, 15 October 2009>, Takehiro Nakamura

2

Developing internet protocol specs

ITU-R/TDeveloping Mobile

li ti

Referring to specs

Developing Recommendations

Standardisation Organisations Communicating with 3GPP

application specs

Referring to 3GPP specs(contributed by individual

members)

Partners of 3GPPReferring to 3GPP specs for

Cross reference of specs

Developing Wireless LAN/MAN specs

Requirements

Input specs

MRP

Terminal

Terminal certification based on 3GPP specs

Cross reference of specs


Organisational Partners

Referring to 3GPP specs for the local specs

JapanEU Korea China North America

Certification


3GPP Structure


Roadmaps

7Runcom Technologies Ltd.7

Source: Qualcomm

LTE Release LTE Release 8 8 and and 99


3

LTE Core and Radio Access Network

Core Network (CN)Core Network (CN)

9Runcom Technologies Ltd.12/11/20109

Radio Access Network (RAN)

LTE overall architecture

EPC (Evolved Packet Core)( )


MME - (Mobility Management Entity) by means of the S1-MME

S-GW - (Serving Gateway) by means of the S1-U.

SAE – System Architecture Evolution


12/11/2010 11

Functional Split between E-UTRAN and EPCLogical Nodes

Functional Entities

Radio Protocol layers

S1 S1

S1 S1X2X2


12/11/2010 12

4

LTE Frame structure

Sampling RateSampling period


12/11/2010 13

Recourse Grid


12/11/2010 14

Mapping of Cell-specific Reference signals


12/11/2010 15

Dedicated RS

4 4 4 4 4 4 4 4


12/11/2010 16

5

LTE Release 8 Major Parameters

Access Scheme UL DFTS‐OFDM

DL OFDMA

Bandwidth 1.4, 3, 5, 10, 15, 20MHz

Minimum TTI 1msec

Sub‐carrier spacing 15kHz

Cyclic prefix length Short 4.7μsecLong 16.7μsec


Modulation QPSK, 16QAM, 64QAM

Spatial multiplexing Single layer for UL per UE

Up to 4 layers for DL per UE

MU‐MIMO supported for UL and DL

LTE developed protocol stack


12/11/2010 18

LTE Release 8 Key Features

• High spectral efficiency– OFDM in Downlink– DFTS-OFDM(“Single-Carrier FDMA”) in Uplink– Multi-antenna application

• Very low latency (TTI, RRC procedure, …)• Support of variable bandwidth

– 1.4, 3, 5, 10, 15 and 20 MHz• Simple protocol architecture (PS for VoIP)• Simple Architecture• Compatibility and inter-working with earlier 3GPP Releases• Inter-working with other systems, e.g. cdma2000


g y , g• FDD and TDD• Efficient Multicast/Broadcast (Single frequency network by OFDM)• Support of SON

LTE performances

• Peak DL rates (for 20MHz):– 326.4 Mbit/s for 4x4 antennas, – 172.8 Mbit/s for 2x2 antennas for every 20 MHz of spectrum.

• Peak upload rates of 86.4 Mbit/s p /• 5 different terminal classes. All terminal will be able to process 20 MHz

bandwidth. • At least 200 active users in every 5 MHz cell• Sub-5ms latency for small IP packets • Transmission Time Intervals: 1 msec• HARQ Retransmission Time: 8msec• Bearer Services: Packet only


y• Optimal cell size of 5 km, 30 km sizes with reasonable performance, and

up to 100 km cell sizes supported with acceptable performance • Co-existence with legacy standards (smooth HO with GSM, GPRS, W-

CDMA-based UMTS or even 3GPP2) • Supports MBSFN. This feature can deliver services such as Mobile TV, and

is a competitor for DVB-H-based TV broadcast.

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Achievable Peak Data Rates


12/11/2010 21

LTE-Release 8 User Equipment Categories

Category 1 2 3 4 5

Peak rate DL 10 50 100 150 300Mbps UL 5 25 50 50 75

Capability for physical functionalities

RF bandwidth 20MHz

Modulation DL QPSK, 16QAM, 64QAM

UL QPSK, 16QAM QPSK,16QAM,64QAM


Multi‐antenna

2 Rx diversity Assumed in performance requirements.

2x2 MIMO Not supported

Mandatory

4x4 MIMO Not supported Mandatory

ll d dd dLTE Release LTE Release 10 10 and Beyondand Beyond(LTE(LTE--Advanced)Advanced)


IMT advanced – General requirements (1)

ITU IMT advanced is the base line for the 4G requirement

• Higher spectral efficiencies and peak data rates up to 1Giga bps.• Lower latencies (air-link access latency, [Inter-FA HO, Intra-FA HO, inter-

RAN HO] latencies) to enable new delay sensitive applicationsRAN HO] latencies) to enable new delay-sensitive applications.• Mobility Support: Cellular systems including IMT-Advanced are required

to support the environments described in following:

– Pedestrian (Pedestrian speeds up to 10 km/h)– Typical Vehicular (Vehicular speeds up to 120 km/h)– High Speed Vehicular (Vehicular speeds up to 500 km/h)– Seamless application connectivity to other mobile networks and other IP networks

(global roaming capabilities).


• Support for larger cell sizes and improved cell-edge performance.• Low-cost and low-complexity terminals for worldwide use.• Improved Unicast and multicast broadcast services.• Provision for PAN/LAN/WAN Co-location / Coexistence.• And more

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IMT advanced – detailed requirements (2)

• Multiple access methods• OFDMA, CDMA and also Single-carrier/Multi-carrier operation,

..• FDD H FDD and TDD modes• FDD, H-FDD and TDD modes• DL:UL ration configurable• Different Ch-BW configurable for FDD mode (e.g. 10MHz

downlink, 5MHz uplink )• scalable bandwidths from 5 to 20 MHz• Support of Advanced Antenna Techniques:

Mi i t fi ti i t h ll b


• Minimum antenna configuration requirements shall be: – For the base station, a minimum of 2xTX and 2xRX antennas– For the MS, a minimum of 1xTX and 2xRX antennas

IMT advanced – detailed requirements (3)

• Link Adaptation and Power Control • Maximum Latency (MAC to MAC): 10msec BS MS

and MS BS• State transition latency: IDLE_STATE to

ACTIVE_STATE : 100msec• Maximum Handover Interruption :

– Intra-frequency: 50 msec, – Inter-frequency: 150 msec

E h d L ti B d S i (LBS)


• Enhanced Location Based Services (LBS)• Enhanced Multicast Broadcast Service (E-MBS)

Current agreements on the requirements for LTE Advanced

• Peak data rate DL: 1 Gbps, UL: 500 Mbps• Transmission bandwidth: Wider than ~70 MHz in DL and 40 MHz in UL• Latency: C-plane from Idle (with IP address allocated) to Connected in

<50 ms and U-plane latency shorter than 5 ms one way in RAN taking ( )into account 30% retransmissions (FFS)

• Cell edge user throughput 2 times higher than that in LTE• Average user throughput 3 times higher than that in LTE• Capacity (spectrum efficiency) 3 times higher than that in LTE• Peak spectrum efficiency DL: 30 bps/Hz, UL: 15 bps/Hz• Spectrum flexibility: Support of scalable bandwidth and spectrum

aggregationb l h


• Mobility: Same as that in LTE• Coverage should be optimized or deployment in local areas/micro cell

environments with ISD up to 1 km• Backward compatibility and interworking with LTE with 3GPP legacy

systems

LTE Advanced – RAN1 issues under discussion

• Various concepts for Relay Nodes• UE Dual TX antenna solutions for SU-MIMO and diversity MIMO• Scalable system bandwidth exceeding 20 MHz, Potentially up to 100MHz

(for stationary devices)(for stationary devices)• Local area optimization of air interface• Nomadic / Local Area network and mobility solutions• Flexible Spectrum Usage• Cognitive Radio• Automatic and autonomous network configuration and operation• Enhanced precoding and forward error correction


• Interference management and suppression• Asymmetric bandwidth assignment for FDD• Hybrid OFDMA and SC-FDMA in uplink• UL/DL inter eNB coordinated MIMO

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• Peak data rate– 1 Gbps data rate will be achieved by 4-by-4 MIMO and transmission

System Performance Requirements

p y ybandwidth wider than approximately 70 MHz

• Peak spectrum efficiency– DL: Rel. 8 LTE satisfies IMT-Advanced requirement– UL: Need to double from Release 8 to satisfy IMT-Advanced

requirementRel. 8 LTE LTE-Advanced IMT-Advanced

Peak data rateDL 300 Mbps 1 Gbps

1 Gbps(*)


Peak data rate 1 Gbps( )UL 75 Mbps 500 Mbps

Peak spectrum efficiency [bps/Hz]

DL 15 30 15UL 3.75 15 6.75

*“100 Mbps for high mobility and 1 Gbps for low mobility” is one of the key features as written in Circular Letter (CL)


System Performance Requirements (Cont’d)

Capacity and cell‐edge user throughput• Target for LTE‐Advanced was set considering gain of 1.4 to 1.6 from Release 8 LTE performance

Cell‐edge user thro hp t

DL 2‐by‐2 0.05 0.07 –

Ant. Config. Rel. 8 LTE*1 LTE-Advanced*2 IMT-Advanced*3

Capacity [bps/Hz/cell]

DL 2-by-2 1.69 2.4 –

4-by-2 1.87 2.6 2.24-by-4 2.67 3.7 –

UL 1-by-2 0.74 1.2 –2-by-4 – 2.0 1.4

x1.4-1.6


throughput [bps/Hz/cell/user] 4‐by‐2 0.06 0.09 0.06

4‐by‐4 0.08 0.12 –

UL 1‐by‐2 0.024 0.04 –

2‐by‐4 – 0.07 0.03

*1 See TR25.912(Case 1 scenario) *2 See TR36.913(Case 1 scenario)*3 See ITU-R M.2135(Base Coverage Urban scenario)


j fj fMajor featuresMajor featuresLTELTE--Advanced TechnologiesAdvanced Technologies


System bandwidth, e g 100 MHz

CC, e.g., 20 MHz

Carrier Aggregation

Frequency

e.g., 100 MHz

UE capabilities

• 100-MHz case

• 40-MHz case

• 20-MHz case (Rel. 8 LTE)

32Runcom Technologies Ltd.Source: © 3GPP 2009 <ITU-R WP 5D 3rd Workshop on IMT-Advanced, 15 October 2009>, Takehiro Nakamura

9

DL/UL Uplink Multiple Access Scheme

Channelcoding

Channelcoding

Channelcoding

Channelcoding

Transportblock

Transportblock

Transportblock

Transportblock

Mod.

Mapping

cod g

HARQ

Mod.

Mapping

cod g

HARQ

Mod.

Mapping

cod g

HARQ

Mod.

Mapping

cod g

HARQ

CC


“N-times DFT-Spread OFDM”CC

Freq.

CC

Parallel Rel. 8 LTE transmission

PUCCH region

PUSCH(Physical uplink shared channel)

MIMO variance

Single‐user MIMO (SU‐MIMO)

Multi‐user MIMO (MU‐MIMO)

Single‐layer beamforming (Single‐layer BF)

Ex) Ex)Ex)

Single‐input multiple‐output ( )

Multi‐user MIMO ( )


(SIMO) (MU‐MIMO)

Ex) Ex)


Max. 8 streams

CSI feedback

Enhanced Multi-antenna Techniques in DL/UL

Enhanced MU-MIMO

Higher-order MIMO up to 8 streams


Max. 4 streams

SU-MIMO up to 4 streams


Coherent combining or dynamic cell selection

CoMP

Coordinated scheduling/beamformingJoint transmission/dynamic cell selection

Receiver signal processing at central eNB (e.g., MRC, MMSEC)


Multipoint receptionSource: © 3GPP 2009 <ITU-R WP 5D 3rd Workshop on IMT-Advanced, 15 October 2009>, Takehiro Nakamura

10

Relaying

Type I & Type 1a


11-Dec-10 37

LTE-A Relay RN Tree

LTE-A Relay

: Rel-8 frame structure

: Rel-10 frame structure

Type-I Relay

Out-of-bandRelay

In-bandRelay

Type-IIRelay

TDD Type-IIRelay

FDD Type-II Relay


TDD Out-of-bandRelay

FDD Out-of-bandRelay

TDD In-bandRelay

FDD In-bandRelay

User plane latency

FDD TDD

• LTE fulfills ITU-R requirements on user plane latency

UE eNB

1.5 ms

HARQ RTT 8 ms

1.5 ms

TTI

1 ms

UE eNB

1ms+ FAt 1.5ms

TTI

1 ms

UE eNBTTI

(a) Downlink

FDD TDD


1.5 ms 1.5 ms 1 ms 1.5ms1ms+ FAt 1 ms

(b) Uplink

0 % BLER 4.0 msec

10 % BLER 4.8 msec

0 % BLER 4.9 msec

10 % BLER 6.035 msec


LTE Advanced requirements


12/11/2010 40

11

Summary of IEEE802.16m objectives


12/11/2010 41

Thank You!

Peretz Shekalim


Runcom Tech LTDVP System and Standardsmobile: +972 54 3108448office: +972 3 9428850email: [email protected]

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