3gp p lte e nhancements and 5g - ieee/cic iccciccc2014.ieee-iccc.org/5. ntt docomo iccc2014.pdf ·...

NTT DOCOMO, INC., Copyright 2014, All rights reserved. 1NTT DOCOMO Confidential

3GPP LTE Enhancements and 5G

Satoshi NagataNTT DOCOMO, INC.

3GPP TSG-RAN WG1 Chairman


3GPP LTE Enhancements


Release of 3GPP specifications

1999 2000 2001 2002 2003 2004 2005

Release 99

Release 4

Release 5

Release 6

1.28Mcps TDD

HSDPA

W-CDMA

HSUPA, MBMS

2006 2007 2008 2009

Release 7 HSPA+ (MIMO, HOM etc.)

Release 8

2010 2011

LTE

Release 9

Release 10

Minor LTE enhancements

2012 2013

Release 11

ITU-R M.1457IMT-2000 Recommendation

LTE-AdvancedITU-R M.2012IMT-Advanced

Recommendation

2014

Release 12

To be frozen in Sep. 2014


• Wider bandwidth (carrier aggregation)– To improve peak data rate and spectrum flexibility– To meet ITU-R requirements for bandwidth (>=40 MHz)– Spectrum/carrier aggregation based on component carrier (CC) concept to maintain backward

compatibility and allow smooth network migration

• Advanced MIMO techniques– To improve peak data rate and cell/cell-edge spectrum efficiency– To meet ITU-R requirements for DL cell spectrum efficiency– SU-MIMO with up to 8-layers for DL and 4-layers for UL– MU-MIMO with enhanced CSI feedback

• Enhanced inter-cell interference coordination (eICIC)– To improve cell-edge user throughput, coverage, and deployment flexibility– Interference coordination for layered cell deployment with different Tx power levels

• Relaying– To improve coverage and cost effective deployment– Type 1 relay node terminating up to layer 3, which can be seen as Release 8 eNodeB from Release

8 LTE terminal

• LTE Self Optimizing Network (SON) enhancements• HNB and HeNB mobility enhancements

100 MHz

fCC

Key Features in Release 10


• Carrier aggregation (CA) enhancements– Different TDD UL/DL configuration on different band– Multiple timing advance (TA) for UL CA

• Enhanced downlink control channel (EPDCCH)– Enhanced DL control channel to support increased control

channel capacity, freq. domain ICIC, beamforming and/or diversity

• CoMP transmission and reception– CoMP for Homogeneous/Heterogeneous NW

• Enhancement on DL/UL reference signal, control signal• Channel state information feedback and measurement

• Further enhanced inter-cell interference coordination (FeICIC)

– Interference cancelation technique for UE (e.g., CRS canceller from Macro-cell)

• Improved minimum performance requirements for E-UTRA: Interference rejection

– Interference rejection combining (IRC) UE receiver

Optical fiber

Coordination

PDCCH

ePDCCH DM-RS

f

t

2Rx IRC receiver

Desired beam

Interfering beam

freqPcell Scell

Multiple TA

Key Features in Release 11Physical-layer aspects


• Enhancement of Minimization of Drive Tests (MDT)– Intention is to provide mechanisms to collect radio measurements together with location

information from eNB/UE to reduce operator costs for performing manual drive tests– QoS measurements (e.g. throughput, traffic volume) added in Rel-11 specs

• RAN overload control for Machine-Type Communications (MTC)– Intention is to protect the NW from potentially very large number of MTC terminals– CN/RAN overload avoidance specific to MTC terminals added in Rel-11 specs

• Further self optimizing networks (SON) enhancements– Procedures for inter-RAT MRO added in Rel-11 specs

• Network Energy Saving– Procedures for inter-RAT energy saving added in Rel-11 specs

• LTE RAN Enhancements for Diverse Data Applications– Intention is to specify RAN improvements considering various data traffic, e.g. those

generated by smartphones– Signaling for optimization of terminal battery consumption specified in Rel-11

Key Features in Release 11Higher-layer aspects


LTE Release 12

Small cell related enhancements•TDD-FDD CA (Carrier aggregation)•SCE (Small cell enhancement)•Dynamic TDD

Service oriented enhancements• D2D (Device to Device)

communication/discovery• MTC (Machine Type Communication)Enhancements for higher spectrum efficiency• NAICS (Network Assisted Interference

Cancellation and Suppression)• MIMO enhancement• eCoMP

Hotspot Network densification

x x

D2D

TDD-FDD CA

SCE

MIMOenhancement

NAICS

Freq.

Macro Small

Ex. 2GHz Ex. 3.5GHz

Dynamic TDD

Small cell• High capacity• High traffic fluctuation• Low Tx power node• (TDD with higher frequency band)

eCoMP

MTC


Small Cell Enhancements (SCE)-PHY aspects-

• Objective– Spectrum efficiency improvements

• Higher order modulation (e.g.,256QAM)

– Efficient small cell operation• Efficient small cell discovery

• Small cell on/off

• Radio Interface-based sync.

Macro cellSmall cell

Discovery signal transmissions

Macro cell assists Small Cellfor battery-efficient discovery

DL DATA and reference signalCell #1

Cell #2

Cell #3

Discovery signalONOFF (DTX)ON

Macro-assisted measurement timing


• Dual connectivity– UEs having dual connectivity to macro and small cell layers

served by different or same carrier

Small Cell Enhancements (SCE)-Higher layer aspects-


MIMO EnhancementsRel-10 MIMO

2D MIMO enhancement

Elevation beam forming Full dimension-MIMO

• Max. 8-Tx Beam gain and interference

reduction using 3D beam

•Max. 8-Tx (Max. 4-Tx for FDD)•Achieves beamforming in azimuth angle

• More than 8-Tx (e.g., 16, 32, …)• Higher freq. (e.g., 3.5 GHz-)Progressive capacity enhancement

• 4-Tx codebook enhancement• Feedback enhancement for MU-

MIMO

Rel-12 MIMO3D MIMO using active antenna system

N

M

NxM antennas(Using higher

freq.)

Study of 3D channel model (3D UE distribution, 3D pathloss, fast fading, etc

Optimization forrealistic environment

Beamforming inazimuth/elevation angle

Enhancement of the number of antennas

Rel-13 target featuresRel-12 feature


NW-Assisted Interference Cancellation and Suppression

• Study on a variety of receiver types and need of interference information– Interference suppression: Enhancement of Rel-11 receiver– Interference cancellation: Subtraction of interference replica from received signal, e.g., SIC

Rel. 11 Advanced receiver Rel. 12 Advanced receiverTarget for receiver Interference limited areas,

i.e., cell edgeAll areas including cell edge

Inter-UE interference for MU-MIMO

■Target for Advanced receiver

Severer interference for other scenarios

Inter-cell interference at cell edge


TDD-FDD Joint Operation

FDD TDDFreq.UL DL UL/DL

eNB

UL/DL

UL/DL

UL/DL

PCell

SCell

SCell

SCell

SCell

• Objective– TDD-FDD carrier aggregation

• Either TDD or FDD as Pcell

– TDD-FDD joint operation (e.g., multi-stream aggregation, dual mode UE)

• Identify deployment scenarios of joint operation on FDD and TDD spectrum, and network/UE requirement


eIMTA* (Dynamic TDD)

• Objective– TDD UL-DL reconfiguration

for traffic adaptation• Reconfiguration

mechanism• HARQ scheme

– Interference mitigation with TDD UL-DL reconfiguration

• UL power control

Cell 1Cell 2

Scheme 1 Scheme 2

Scheme 3 Scheme 4

Interference mitigation schemes

Cell clustering Schedulingenhancement

Interference mitigation based on (F)eICIC

Interference suppressingand mitigation

* eIMTA: Further enhancements to LTE TDD for DL-UL interference management and traffic adaptation

DL-to-UL interference

UL-to-DL interference


Device to Device (D2D) proximity service

• Objective– Commercial use with NW coverage– Public safety/critical communication

with/without NW coverage– Two kinds of technical topics

• D2D discovery• D2D communication

Disaster, Terror

Outside NWWithin NW coverage

D2D

Current NWInternet

Discovery Discovery+ Communication

Streaming,Mail, etc.

Internet

Advertise, ITS, etc.

Comm. for public safety

Required both for public

safety & non-public safety

With NW coverage

Without NW coverage

Discovery

Commu-nication

Public safety only

Required at least for public

safetyPublic safety only


• LTE-based unlicensed spectrum utilization technologies– Exploit unlicensed spectrum which is widely used by Wi-Fi,

e.g., 5 GHz– Try to achieve better traffic offloading and higher user

experience using LTE than those for Wi-Fi due to tighter interworking between licensed and unlicensed bands

Licensed Unlicensed band

Carrier aggregation mode

FreqLicensed Unlicensed band

Supplemental DL mode

Freq

Licensed-Assisted Access (LAA) (1)(LTE over Unlicensed Spectrum)


Licensed-Assisted Access (LAA) (2)(LTE over Unlicensed Spectrum)

Press release, Aug 21th, 2014

https://www.nttdocomo.co.jp/english/info/media_center/pr/2014/0821_00.html

DOCOMO and Huawei jointly tested on LAA over the 5GHz unlicensed spectrum.• The indoor test found that LAA leads to cell capacity of approximately 1.6

times greater than that of IEEE 802.11n.• LAA can be utilized as an enhancement of LTE/LTE-Advanced, i.e.,

higher-speed data communications and a higher cell capacity in dense traffic areas should be achievable by utilizing the 5GHz spectrum for LTE/LTE-A on a complementary basis in coexistence with wireless LAN.

LTE(LAA) Terminal × ４

WiFi Terminal × ４

Combiner/DistributerWiFi Access Point

ＬＴＥ eNB（ＬＡＡ）

Shared Antenna of ＬＴＥ/WiFi

５ＧＨｚ（２０ＭＨｚ Bandwidth）

1.6 times of capacity enhancement

1.6 times of capacity enhancement

RF cable

LTE(LAA)

WiFi（８０２.１１ｎ）


5G


5G Global Trends

• Discussions on 5G become active worldwide

Future IMT Vision in ITU-R WP5D

Vision2020/ Network2020

National/international projects on 5G

Special sessions on 5Gin international conferences

5GPPP

Global initiative to define operator requirements on “5G”

ARIB 2020 and Beyond AH

5G Project


5G Trends and Requirements


5G Requirements

Higher data rate Reduced Latency

Massive device connectivity

Energy saving & cost reduction

• 100x typical data rate(Even for high mobility)

• 100x connected devices(Even in crowded areas)

• Energy saving for NW & terminals• Reduced NW cost incl. backhaul

Higher systemcapacity

• RAN latency : < 1ms

• 1000x capacity/km2

5G

5G radio access will provide a total solution to satisfywider range of requirements for 2020 and beyond


Directions of Evolution: “The Cube”

Spectrum extension

Network densification

Required performance

Spectrum efficiency

Current capacity

New cellular concept for cost/energy-efficient dense deployments

Non-orthogonal multiple access

Study for new interference scenarios

Dense urbanShopping mall

Hotspot

Cellular network assists local area radio access

Efficient use of higher spectrum bands

Tx-Rx cooperative access technologies

A set of radio access technologies is required to satisfy future requirements

Existing cellular bands Higher/wider frequency bands

Frequency

Very wide Super wide

Controller

TRx

TRx

TRx

TRx

TRx

TRx

TRx

TRx

3D/Massive MIMO,Advanced receiver

WiFi

Traffic offloading


5G Definition, Capabilities and Deployments


Evolution Paths for 5GP

erfo

rman

ce

~2015

Rel-10/11Rel-8/9

Pico/Femto

LTE

LTE-AdvancedRel-12/13

PotentialNew RAT

~2020 Year

5G Radio Access

Rel-14/15,…

• Further LTE enhancements– Small cell & general cellular

enhancements for beyond Release 12• Potential new RAT

– Should prioritize the achievement of more big gains over backward compatibility

– Consider new spectrum allocations of WRC-15 and beyond

Macro-assistedsmall cell enhancement

(Phantom cell)

CA/eICIC/CoMP for HetNet WRC-15

Further LTEenhancement

WRC-18

Big gain

Continuous evolution

5G = LTE enh. + New RAT


NTT DOCOMO’s Activities Toward 5G


Collaboration for 5G Trials

Existing Frequency Bands Wideband Transmission Over Higher Frequency Bands

Frequency

Low SHF3-6GHz

High SHF6-30GHz

EHF> 30GHz

EricssonExperiments on

new radio interface concept and

Massive MIMO(15GHz Band)

NokiaExperiments on

super-wideband single carrier transmission and beamforming

(70GHz Band)

Alcatel-LucentExperiments on

candidate waveforms to support mobile

broadband & M2M

SamsungExperiments on super-wideband

hybrid beamformingand beam tracking

(28GHz Band)

NECExperiments on time-domain beamforming

with very large number of antennas(5GHz Band)

FujitsuExperiments on

coordinated scheduling for super dense base stations

using RRH

UHFEx. 800MHz, 2GHz

DOCOMO to Conduct 5G Experimental Trials With World-leading Mobile Technology VendorsTOKYO, JAPAN, May 8, 2014 --- NTT DOCOMO, INC., a personalized mobile solutions provider for smarter living, announced today that it will conduct experimental trials of emerging 5G mobile communications technologies with six world-leading mobile technology vendors: Alcatel-Lucent, Ericsson, Fujitsu, NEC, Nokia, and Samsung.


Proposal on 5G Standardization time plan

2014 2015 2016 2017 2018 2019 2020

WRC15 WRC18/19

Rel. 12

Rel. 13

Rel. 14 Rel. 15

Spectrum < 6GHz Spectrum > 6GHz

5G launch

Study for 5G

Specification for 5G and 5G enhancements

Can/should we start specification work for spectrum above 6GHz

before WRC18/19?

?

3gp p lte e nhancements and 5g - ieee/cic iccciccc2014.ieee-iccc.org/5. ntt docomo iccc2014.pdf ·...

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