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工業技術研究院機密資料禁止複製、轉載、外流│ ITRI CONFIDENTIAL DOCUMENT DO NOT COPY OR DISTRIBUTE

LTE TrendsLTE Trends--

Towards R12 and beyondTowards R12 and beyond

工業技術研究院-資通所

技術副理

顏嘉邦


OutlineOutline

What drives LTE Rel-12 and beyond?

What is the scope of “Rel-12 and Beyond”?

What are the solutions?

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Source: 1000x mobile data challenge, Qualcomm


Data TsunamiData Tsunami

Capacity increase to cope with traffic explosionReport ITU-R M.2243 (IMT.UPDATE): 15~30 times traffic growth is envisioned between 2010 and 2015Mobile data traffic is growing over DOCOMO network

Approx 1.6 timer per year (2004 –2009)Approx 2 timers per year (2010 –2011)Approx 12 times traffic growth is envisioned between 2011 and 2015Mobile data traffic is expected to grow beyond 500x in 10 years (2010 –2020)

Mobile traffic 50x in 2015 and 1000x in 2020 compared to 2009. Capacity increase needs to be cost competitive and energy efficient.Cell and Cell-edge spectrum efficiency enhancements

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Data TsunamiData Tsunami

5


RelRel--12 and Beyond Workshop12 and Beyond WorkshopLjubljana, Slovenia,Ljubljana, Slovenia,

June 2012June 2012


RequirementsRequirements

Capacity increase to cope with traffic explosion

Energy saving

Cost efficiency

Support for diverse application and traffic types

Higher user experience/data rate

Backhaul enhancement

8Resource: RWS-120045/RWS-120025


Potential Technologies (1/3)Potential Technologies (1/3)A great majority showed interest in Enhanced Small Cell for LTE. Technologies proposed by many members are:

Interference coordination / management

Dynamic TDD

Enhanced discovery / mobility

Frequency separation between macro and small cells with higher frequency band, e.g. 3.5 GHz band, for the small cells

Inter site CA / macro cell assisted small cells

Wireless backhaul for small cell

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Source: RWS-120045


Potential Technologies (2/3)Potential Technologies (2/3)

Very clear interest related to LTE Multi-Antenna/site technologies such as:

3D MIMO/beamforming

Further CoMP/MIMO enhancements

New procedures and functionalities for LTE to support diverse traffic types proposed by many members

Control signaling reduction, etc.

10


Potential Technologies (2/3)Potential Technologies (2/3)

Good interest in:Interworking with WiFi

Continuous enhancements for MTC, SON, MDT and advanced receiver

D2D

Further enhancements for HSPA including interworking with LTE

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RelRel--12 Study Items/Working Items12 Study Items/Working Items

Small Cell Enhancement

New Carrier Type (NCT)

3D Beamforming

Enhanced Interference Mitigation and Traffic Adaptation (eIMTA)

Coordinated Multipoint Transmission (CoMP)

Low-cost MTC (Machine Type Communications)

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RWS-120020

Three key performance factors

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Small Cell EnhancementSmall Cell Enhancement

Optimized small cell mobility by reducing RAN to CN signalling

Improved data rated by using macro and small cell together

Cell splitting gain

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Small Cell EnhancementSmall Cell Enhancement

Inter-eNB Carrier AggregationC-plane on Macro eNB for mobility robustness

U-plane on Pico eNB for throughput boost

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f1

f2

Data rate

Macro eNB

Pico eNB

Source: RWS-120021, Samsung


New Carrier TypeNew Carrier Type

Already started in Rel-11

MotivationsMinimized inter-cell interference

Lowered energy consumption

Significant overhead reduction

Standalone NCT new RAT

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3D Beamforming3D Beamforming

Source: RWS-120021 (Samsung)

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Solution for capacity demand Benefit

0 5 10 15 20 25 300

5

10

15

Cel

l-ave

rage

thr

ough

put

(b/s

/Hz)

Number of us ers per s ector

Throughput with (8x8), dH

= 0.5, dV

= 4

0 5 10 15 20 25 300

0.5

1

Cel

l-edg

e th

roug

hput

(b/

s/H

z)

Full Dimension MIMO with 2D AAS (Active Antenna System)

MU-MIMO with 10s of UEs

2D AAS array & 100 antennas Rel-10 Rel -12FD-MIMO32-64 Tx

Rel-13 FD-MIMO100 Tx

Capacity

3-5x

10x

3D-SCM channel

Cell capacity increases until around 30 users/sector

Cell-edge throughput drops but still better than the reference value of

0.01


eIMTAeIMTA

Adaptation to local traffic with flexible TDD DL/UL configuration

Isolate cell clusters, e.g., shopping mall, airport, etc.

Heterogeneous networks

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Isolated ClusterOperating in UL

Isolated ClusterOperating in DL

Isolated Cluster Operating in UL

UE-UE Interference

eNodeB-eNodeB Interference

eNodeB-eNodeB propagation links with low pathloss (high pathgain)

DL/UL signal transmission on serving links (useful signal)

DL-UL interference links UE-UE or eNodeB-eNodeB (new interference types)

eNodeB-eNodeB propagation links with high pathloss (low pathgain)

DL or UL inter-cell interference UE-eNodeB or eNodeB-UE

R1-121529, Intel


Nokia, RWS-120004

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Beyond RelBeyond Rel--1212

Proximity Services (ProSe aka D2D)Proximity gain:

high bit rates, low delays, and low power consumption

Reuse gain

Hop gain

Advanced ReceiversRemoving interference to increase

UL and DL capacity

New RAT on stand-alone NCTOFDMA for UL: UL reference signal reduction

… .

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Source: RWS-120007, Qualcomm

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Other TechnologiesOther Technologies

22

工業技術研究院機密資料禁止複製、轉載、外流│ ITRI CONFIDENTIAL DOCUMENT DO NOT COPY OR DISTRIBUTE 23Source: RWS-120041, Samsung


SummarySummaryPrepare for 1000x Data Tsunami

Requirements for future cellular systems

Capacity increase

Energy saving

Massive growth in number of devices

Wide range of use case

Rel-12

Small Cell Enhancement

New Carrier Type (NCT)

3D Beamforming

Enhanced Interference Mitigation and Traffic Adaptation (eIMTA)

Beyond Rel-12

Proximity Services (ProSe)

More Advanced Receiver

Higher Frequency Band

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