R&D Activities for Future Mobile Communications

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©

2009 NTT DOCOMO, Inc. All rights reserved.

R&D Activities for Future
Mobile Communications

AFICT 2009

2009.12


Junichiro HAGIWARA

Research Laboratories, NTT DOCOMO Inc.

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2

Topics

Part I: DOCOMO’s Current Service and R&D
Status of New Systems


3G/3.5G service


3G Long
-
Term Evolution (LTE) “Super 3G”
system development


4G LTE
-
Advanced technologies research


Part II: DOCOMO’s Change and Challenge for
New Growth


DOCOMO’s mid
-
term vision


Several examples of the challenge

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Part I

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4

Reference : Telecommunications Carriers Association

Mobile Communication Market in Japan

Subscribers (Million)

Penetration Rate (%)

70

60

50

40

30

20

10

20

30

40

50

60

80

70

90

Fiscal Year


97


98


00






























25

33

41


02












03





































99


01


04

34.6

51.9

62.5

69.7

75.2

31.5

41.5

51.1

60.9

69.1

75.7

81.5

87.0

48

55

60

64

68














05

79.8

91.8

72

7.2

16.7

30.4

44.6













84.4

69.9


06

96.7

76

80














07

102.7

(Mar.

08)

Mobile Subscribers

Mobile Internet Access

Penetration Rate

3G Subscribers

100

88.1

81

88.7

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5

0
10
20
30
40
50
10
1
4
7
10
1
4
7
10
1
4
7
10
1
4
7
10
1
4
7
10
1
4
7
10
1
4
7
10
1
Subscriber Migration from 2G to 3G in DOCOMO

million

Number of subscriber

2G
:mova

50%

Jun. 2006

3G
launch

Oct. 2001

2002

(forecast)

3G:FOMA

2003

2004

2005

2006

2007

2008

2009

2001

86%

Sept. 2008

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Growth of Packet Usage in DOCOMO

June 2004

Flat
-
rate service on i
-
mode

Normalized Data Traffic per day per person

(The value of October of 2001 is assumed 1.0.)

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10M

1M

100k

10k

1k

100M

1G

92

00

94

96

98

02

04

2.4k

PDC

9.6k

PDC

PDC

Packet

32k

PHS

64k

PHS

2~4M

average

11M

802.11a

54M

54M

IEEE 802.11

FTTH

100M

2M

802.11

802.11g

12M

26M

50M

384k

2M

28.8k

ADSL

90

06

08

10

14.4K

28.8K

56K

Peak

14M

MAX

sepc.

100M

at High

mobility

1G

at Low

mobility

HSPA

W
-
CDMA

4G

600M

802.11n

75M

802.16e

Super3G

(LTE)

8M

1.5M

300M

Peak

ISDN

INS Net1500

INS Net64

802.11b

Year

3
rd
Generation

2
nd
Generation

IEEE 802.11(WiFi)

Analog modem/ADSL/FTTH

4
th
Generation

IEEE 802.16a

Data speed [bps]

Trend in Communication Bandwidth

HSDPA&HSUPA

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User data speed

384 kbps

max.
14 Mbps

Modulation
scheme

QPSK

16QAM

Coding rate

Code

utilization

35 times

High Speed Downlink Packet Access

(HSDPA)/3.5G


HSDPA realize higher user data rate with 35 times
and its terminals can meet increasing demand for
more variety packet services.

0.442

0.971

0.119

0.934

W
-
CDMA

R99

HSDPA

Rel.5

(Category 10)

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Super 3G (LTE/3.9G)


High
-
level Objective

²
To ensure the continuous and long
-
term growth of mobile
communication industry


To provide competitive system
capability even in the 4G era



Realization of excellent
access which has no
restriction caused by radio
transmission


To provide a smooth path to 4G
introduction



Technical requirements

²
High data speed with Low latency
and High Capacity


Smooth migration with reasonable
CAPEX and OPEX

It will be recognized to be important

that Super3G/LTE has an evolutionary path to 4G.

2000

2005

2010

Start in

DOCOMO

Start in


World market

Wide spread in

HSDPA

R99

4G

HSUPA

Super 3G

R99

HSDPA

HSUPA

4G

S3G

Smooth
introduction of
4G

Long
-
term evolution of 3G

to keep competitive capability

3G Spectrum

4G Spectrum

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Super 3G/LTE Radio Access and RAN
Architecture

Core Network

ATM

WCDMA

Node B

3G RAN

3G Spectrum

Node B

RNC

(HSPA)


eNB

IP

IP


eNB

VoIP

capable

New RAN Architecture


Low latency


Low
-
捯s琠獩浰l攠慲捨i瑥捴ure

Super 3G focuses on PS domain

IP

Transport

IP

Change in Radio
Access Technology
(Air
-
Interface) only

4G Radio


100M
-
1Gbps

4G Spectrum

S3G

NodeB

4G

NodeB

Ready to plug
-
in

4G Radio Access

Ultimate enhancement using
new technology elements,
e.g. OFDM, MIMO

S3G Radio


Low latency


㜵M/3〰Mbps

3G Spectrum


eNB: evolved NodeB(Super3G BTS)


All IP
Network

MME/S
-
GW

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Recommendation ITU
-
R M.1645

Framework and overall objectives for the future development of

IMT
-
2000 and systems beyond IMT
-
2000

Targets for IMT
-
Advanced (4G)

New capabilities of Systems Beyond IMT
-
2000

Systems Beyond IMT
-
2000 will encompass the
capabilities of previous systems

Peak Useful Data Rate (Mb/s)

IMT
-
2000

Mobility

Low

High

1

10

100

1000

New

Mobile

Access

New Nomadic / Local

Area Wireless Access

Enhanced

IMT
-
2000

Enhancement

.

Dashed line indicates that the exact
data rates associated with Systems
Beyond are not yet determined

Illustration of capabilities of IMT
-
2000 and systems beyond IMT
-
2000


4G

Super 3G

100 Mbps

1 Gbps

IMT
-
Advanced

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Schedule for IMT
-
Advanced

SDOs

ect.

Submission of
candidate RIT

3GPP RAN

LTE

CR phase



#38



#39



#40



#41



#42



#43



#44



#45



#46



#47



#48



#49















WS



2nd WS

Work Item

Study Item

LTE
-
Advanced

Technical

specifications

2009

2010

2011

2007

2008

ITU
-
R



















WP5D

meetings

No.1 No.2 No.3 No.4 No.5 No.6 No.7 No.8 No.9 No.10

Proposals

Evaluation

Consensus

Specification

WRC
-
07

Circular Letter
to invite
proposals

Identified
Spectrum

Circular
Letter

Study Item approval

ARIB sets up
Radio I/F
proposal WG
.

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Consideration on 3GPP’s LTE
-
Advanced
Requirements, Spectrum and Technology



Wider bandwidth up to 100 MHz


In order to achieve
1 Gbps
data speed, spectrum
bandwidth should be extended up to
100MHz
.


Scalable bandwidth


The scalable bandwidth should be supported
considering a variety of spectrum availability in
each region/country and support of LTE terminals.


LTE based technologies with higher performance


For W
-
CDMA/LTE operators, IMT
-
Advanced should
be LTE basis for smooth introduction on top.


The performance should be higher than that of LTE.


TR 36.913
´

Requirements for Further Advancements for E
-
UTRA (LTE
-
Advanced)

µ?DUH?EDVHG?RQ?WKH?IROORZLQJ?FRQFHSWV?

²

LTE
-
Advanced is an evolution of LTE



All relevant requirements of LTE are valid also for LTE
-
Advanced



LTE
-
Advanced shall meet or exceed IMT
-
Advanced requirements within
the ITU
-
R time plan

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DOCOMO’s Research Activities for 4G


Oct. 2002:
100 Mbps

data

in Laboratory


May 2003: 100 Mbps data in Field Test


Aug. 2004:
1 Gbps

data

in Laboratory


May 2005: 1 Gbps data in Field Test


Dec. 2005: 2.5 Gbps data


Dec. 2006:

5 Gbps data

100 MHz

Mobility

High

Low

Data rate

100 Mbps

(1 bits/sec/Hz)

1 Gbps

(10 bits/sec/Hz)

2.5

5Gbps

(25

50bits/sec/Hz)

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Field Experiments on 5 Gbps Packet
Data

Transmission

5 Gbps

Packet Transmission


using
12
-
by
-
12

MIMO Multiplexing

#2

#2

Trans
-

mitted data

Rx antenna #1

Serial
-
to
-
parallel conversion

Turbo coding and

data modulation

Data demodulation

and turbo decoding

Parallel
-
to
-
serial conversion

Data demodulation

and turbo decoding

#12

Turbo coding and

data modulation

#12

Data demodulation

and turbo decoding

Received

data

Tx antenna #1

Turbo coding and

data modulation

#3

Turbo coding and

data modulation

#3

Data demodulation

and turbo decoding

Signal separation

Base
-
station transmitter

Mobile
-
station receiver

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Part II

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DOCOMO’s Mid
-
term Vision

“Change and Challenge”

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DOCOMO’s Challenge: Service Evolution

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Personalization of Services

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Expansion of International Businesses

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Evolution of Video Services

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Summary


Current 3G services


The migration from 2G to 3G is ongoing.


DOCOMO launched many HSDPA terminals to meet
increasing demand for packet data services.



3G Long
-
term Evolution (LTE) “Super 3G” and
4G (LTE
-
Advanced)


Super3G/LTE has an evolutionary path to 4G


DOCOMO continue to contribute to activities for
IMT
-
Advanced/LTE
-
Advanced.



Future Mobile Communication Service and
System


DOCOMO challenge service evolution.


DOCOMO continue research for future wireless
system.

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23