P-10 Docomo WS on IoT and FRA

7/28/2019 P-10 Docomo WS on IoT and FRA

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NTT DOCOMO, INC., Copyright 2012, All rights reserved. 1

Further LTE Enhancements

toward Future Radio Access

Takehiro Nakamura

NTT DOCOMO, Inc.


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LTE Release 10/11 (LTE-Advanced)Standardization


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3GPP

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

GSM/GPRS/EDGE enhancements

Minor LTEenhancements

2012 2013

Release 11

ITU-R M.1457

IMT-2000 Recommendation

LTE-AdvancedITU-R M.2012IMT-Advanced

Recommendation

Approved at ITU-R RA

in Jan. 2012

3GPP TSG-RAN Workshop on Release 12

onward to be held on June 11-12, 2012


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Key Requirements for LTE-Advanced

March 4, 2011

LTE-Advanced shall be deployed as anevolut ion of LTE Release 8 and on new

bands.

LTE-Advanced shall be backwardscompatible with LTE Release 8

Smooth and flexible system migrationfrom Rel-8 LTE to LTE-Advanced

LTE Rel-8 cell

LTE Rel-8 terminal LTE-Advanced terminal

LTE-Advanced cell

LTE Rel-8 terminal LTE-Advanced terminal

LTE-Advanced backward compatibil ity wi th LTE Rel-8

An LTE-Advanced terminal

can work in an LTE Rel-8 cellAn LTE Rel-8 terminal can

work in an LTE-Advanced cell

LTE-Advanced(LTE Release 10)

LTE Release 8

LTE-Advanced contains all features

of LTE Rel-8&9 and additional

features for further evolution

LTE Release 9

LTE-Advanced evolved

from LTE Rel-8


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Key Features in LTE Release 10&11

Support of Wider Bandwidth(Carrier Aggregation) Rel-10&11 Use of multiple component carriers(CC) to extend bandwidth up to 100 MHz Common physical layer parameters between component carrier and LTE Rel-8 carrier Improvement of peak data rate, backward compatibility with LTE Rel-8

Advanced MIMO techniques Rel-10 Extension to up to 8-layer transmission in downlink Introduction of single-user MIMO up to 4-layer transmission in uplink Enhancements of multi-user MIMO Improvement of peak data rate and capacity

Heterogeneous network and

eICIC(enhanced Inter-Cell Interference Coordination) Rel-10&11 Interference coordination for overlaid deployment of cells with different Tx power Improvement of cell-edge throughput and coverage

Relay Rel-10 Type 1 relay supports radio backhaul and creates a separate cell and appear as Rel-8

LTE eNB to Rel-8 LTE UEs Improvement of coverage and flexibility of service area extension

Coordinated Multi-Point transmission and reception (CoMP) Rel-11 Support of multi-cell transmission and reception Improvement of cell-edge throughput and coverage

Interference rejection combining (IRC) UE receiverRel-11 Improved minimum performance requirements for E-UTRA Improvement of cell-edge throughput

100 MHz

fCC


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Future Radio Access(LTE Release 12 and Beyond)


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Growth of Packet Traffic in DOCOMO

Various services, especially video services, and high-speed mobile accessincreased amount of mobile data traffic

Approx. 1.6 times per year (2004 2009) Approx. 2 t imes per year (2010-2011)

Further traffic growth is projected due to dramatic increase in Smartphone sales



By 2015, the mobile data trafficfootprint of a single subscribercould be 450 times what it was10 years earlier in 2005.

Forecast of Mobile Data Traffic Growth

Mobile video has the highest growth

rate of any application category

Cisco VNI Mobile:

Consensus in the industry is that there will be substantial growthin demand for mobile data traffic over the next 5 10 years

UMTS Forum:



Approach for Capacity Enhancements

Spectrum extension

Network density

Required capacity(bps/km2= bps/Hz/cell x Hz x cell/km2)

Spectrum efficiency

Currentcapacity

New cellular concept for cost/energy-efficient dense deployments

Non-orthogonal multiple access

Study for new interference scenarios

Dense urban

Shopping mall

Home/office

Cellular network assistslocal area radio access

Hybrid access using coverage

and capacity spectrum bands

Multiple access technologieswith Tx-Rx cooperative

interference cancellation

Traffic offloading(alternative means for communication)

WiFi offload, D2D, etc.

We need set of radio access technologies to satisfy

future requirements of500-1000x capacity

Existing cellular bands Higher/wider frequency bands

Frequency

Very wide Super wide

Controller

TRx

TRx

TRx

TRx

TRx

TRx

TRx

TRx

Massive MIMO,Advanced receiver



Other Requirements (1)

Mobility

Data rate

1 Gbpswide area

10 GbpspeakIMT-Advanced

van diagramMobility

Data rate

100 Mbpswide area

1 GbpspeakIMT-Advanced

van diagram

10x improvement in the next decadeMore spectra utilized efficiently

Requirements mainly from user perspective

Source: Artist4G (FP7 ICT), J an. 2010

Higher data rate and user-experienced throughput

Data rate competitive to that offuture wired networks

Gbps-order experiencedthroughput

Low latency for improving userexperience

Fairness of user throughput In a cell

Improve cell-edge throughput Among cells Urban to rural Digital divide

Among users Lower system impact from few

heavy users

Gbps-order

experienced throughput



Other Requirements (2)

Flexible, easy, and cost-efficientoperation

For diverse spectrum allocation Efficient utilization of

higher/wider frequency bands For diverse environments and

network nodes/devices withdifferent types of backhauling

RRE, Femto, relay, etc. For diverse types of services, user

devices, and communicationmethodologies

MTC, thin client, etc.

Energy saving (Green) Reduction in joule per bit

System robustness againstemergencies

Earthquake, Tsunami, etc.

Requirements mainly from operator perspective

Different duplex schemesmay be applied

Frequency

Non-contiguous spectrum allocationover wide range of frequencies

Macrocells RRE Femto

Robustness toemergencies



Possible Standardization Scenario

Standardization scenario towards 2020 Mid-to-long term evolution introducing new technologies to achieve required

capacity gain based on 3GPP LTE radio interface The following two types of evolutions to be considered

Backward-compatible evolutions Evolutions backward compatible to legacy UEs sharing the same spectrum bands New technologies to be introduced, e.g., for further improving spectrum efficiency

Most of new radio access technologies can be introduced in future LTE releases using LTE(OFDM/SC-FDMA) based signal waveform

Complementary evolutions Introduction of new carrier type that is complementary to legacy carrier type(s) with

backward-compatible evolutions Evolutions focusing on new frequency spectrum bands and/or specific scenarios

such as enhanced local area radio access

Rel. 8 Rel. 10

Rel. 1X

Rel. 11 Rel. 1X

Legacy

carrier typeRel. 11 Rel. 1X

Additional

carrier typeNew carrier type or

new radio inter face

Complementary

evolutions

Backward-compatible evolutions

New RAT?



Technologies Related to EfficientSpectrum Extension and Utilization

Spectrumextension

Capacity



Wider Bandwidth

Super-wideband to achieve Gbps as typical data rate

At least more than 200 MHz wil l be desirable (maybe up to 1 GHz)

Utilization of much higher frequencies

Maybe possible to find contiguous wideband spectrum in higher frequency

Bandwidth Spectrum efficiency

100 MHz 10 bps/Hz (4x4 MIMO)

200 MHz 5 bps/Hz (2x2 MIMO)

300 MHz 3.3 bps/Hz (~64QAM)

600 MHz 1.7 bps/Hz (~16QAM)

1000 MHz 1 bps/Hz (~QPSK)

Examples to achieve 1-Gbps data rate

FRA Gbps to be achieved with lower

spectrum efficiency, e.g., without MIMO(More than 10-Gbps can be achievedby MIMO technology)

LTE-A

Existing cellular bands Higher frequency bands

Frequency

Very wide(e.g. > 3.5GHz)

Super wide(e.g. > 10GHz)

How to use in

cellular systems ?



Efficient Spectrum Utilization

Hybrid radio access using lower & higher frequency bands

Basic coverage/mobil itysupported in lower frequency bands, e.g., existingcellular bands

Current Service Quality in terms of Connectivity/ Mobility can be maintained

Support control signaling for efficient small-cell discovery

High speed data transmissionsupported in higher frequency bands

Large bandwidth

Mainly for smaller or denser cell deployments

Existing cellular bands(high power density for coverage)

Higher frequency bands(wider bandwidth for high data rate)

Frequency

Very wide(e.g. > 3.5GHz)

Super wide(e.g. > 10GHz)

Hybrid radio access

Macro-cellular deployments

supporting full coverage area

Various local area scenarios

with low-power nodes/devices



Technologies for Efficient Support ofDenser Network Deployments

Capacity

Requirements for Denser Network



Requirements for Denser NetworkDeployments

Capacity per NW cost (bps/cost)

= Capacity per unit area / NW cost per unit area

Efficient small cell identification & mobility UE battery saving

Can be optimized to low mobility Support for non-uniform deployments

Dense cells for high traffic area

Less efforts on cell planning

(bps/km2 (=bps/cell x cell/km2))

km

km

(cost/km2)Spectrum efficiency x bandwidth

- Low cost NW node & backhauldeployments

- Easy cell planning & maintenance- NW energy saving

Macro cell

Small cell



Deployment Scenarios

Two deployment scenarios are identified for small-cell

deployments (increasing network density): Scenario 1 (Mixed deployment scenario):

Small cell and Macro cell co-exist on a single carrier.

Scenario 2 (Small-cell dedicated carrier scenario): Small cell utilizes a dedicated carrier, where no Macro cell exists.

F1

F2

F0

Scenario 1: Mixed deployment scenario Scenario 2: Small-cell dedicated carrier scenario

Secenario 1 was studied in Rel-11. We assume Scenario 2getting more and more important in Rel-12 onward



RRH CA Deployments

2 GHz(Example)

3.5 GHz

(Example)

Macro cell

Macro cell link can maintain good connectivity and mobility

RRH link can provide high throughput due to frequency reuse

using small RRH cells

Additional carrier type for RRH l ink would provide more flexible

and cost/energy-efficient operations

RRH

RRH

RRH

RRH

RRH link

Macro cell link


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Technologies for Further EnhancingSpectrum Efficiency

Spectrum

efficiency

Capacity

Different Requirements


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Different RequirementsBetween WA and LA Spectra

Different requirements for radio access between Wide Area (WA)and Local Area (LA) spectra in HetNet deployments

But, commonality between WA and LA to be considered within aframework of LTE-based radio interface

Macro-cellular deployments

supporting full coverage area

Various local area scenarios

with low-power nodes/devices

Wide Area spectrum Local Area spectrum

Spectrum effic iency Very important(limited BW)

Important(may not be critical if large BW available)

Mobility Medium-to-High LowCoverage Essential Not critical

(but wider is better)

DL/UL radio link Asymmetric More symmetric

Traffic load More uniform(many users & cell planning)

More fluctuated(less users & non-uniform deployments)


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FDD/TDD in Local Area

FDD is advantageous over TDD in wide area No need for synchronization among cells/operators

The adjacent channel interference is much lower than in TDD Wider coverage and lower latency owing to continuous transmission

DL/UL channels are always "open

TDD might be more applicable in local area & in higher frequency bands Requirements on synchronization among operators can be relaxed in local area

Potential benefits in spectrum sharing between DL/UL Dynamic TDD Traffic is more bursty (unbalanced DL/UL) in local area

Interference management of DL/UL transmissions is required among multi-points

Possibly facilitate worldwide harmonized spectrum allocation

Flexible spectrum allocation

No need for guard band (No need for duplexer)

UL DL

UL DL

UL DL

UL DL

DLUL

DLDL

User #2User #1

User #3User #4

User #2User #1

User #3User #4Enhanced

efficiency

Static DL/UL

allocation

Dynamic DL/UL

allocation


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Concept of Hybrid Radio Access

Hybrid radio access

Adaptation of radio access schemes according to environments,

spectrum bands, types of traffic, etc.

Required high commonality in radio interface among radio access schemes

Example of hybrid access schemes

Hybrid FDD and TDD according to cell environments

Hybrid non-orthogonal and orthogonal multiple access schemesaccording to, e.g., path loss variation among users

Hybrid multi-carrier and single-carrier transmission schemes accordingto, e.g., required coverage or cell environments

Wide area/lower frequency Local area/higher frequency

Adaptation for radioaccess schemes

Resourcemapping& Powercontrol

DFT (SC)

S/P (MC)Tx data IFFT Transmission

Local area

Wide area

freq/time

Orthogonal

freq/time

Non-orthogonal Path loss variationLarge Small(Wide area) (Local area)


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Conclusion

LTE Release 10 and 11

LTE Release 10 was developped and approved in ITU-R M.2012 asLTE-Advanced

LTE Release 11 is under development to enhance LTE Release 10technologies

Future Radio Access (LTE Release 12 and beyond)

3GPP will hold a Workshop on Release 12 onward to identifyrequirements and potential technologies for Future Radio Access

Variety of requirements including reduced cost and further capacityenhancements needed by traffic explosion

Two evolution scenarios, backward compatible evolution andcomplementary evolution, to satisfy both of backward compatibility and

sufficient gain

Key techniques to meet requirements

Efficient utilization of higher and wider spectrum bands

New small-cell dedicated carrier for efficient and simple NW densification

Hybrid Radio Access for wide area and local area enhancements


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P-10 Docomo WS on IoT and FRA