1. R&D Activities for Future Mobile Communications
AFICT 2009
Junichiro HAGIWARA
Research Laboratories, NTT DOCOMO Inc.

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

3. Part I

4. Mobile Communication Market in Japan
102.7
100
Mobile Subscribers
Mobile Internet Access
Penetration Rate
3G Subscribers
91.8
96.7
88.7 90
87.0
81.5
88.1
84.4 81 80 80
75.7
79.8 76
75.2 70
69.1
69.7 70 72
60.9
69.9 60 68
62.5
Subscribers (Million) 64 60
51.1 50 60
Penetration Rate (%)
51.9 55
44.6 50
41.5 40
31.5 48 40
34.6 30 41
30.4 30 20 33
16.7 10 25 20
7.2
’97
’98
’99
’00
’01
’02
’03
’04
’05
’06
’07
Fiscal Year
(Mar.‘08)
Reference : Telecommunications Carriers Association

5. Subscriber Migration from 2G to 3G in DOCOMO
(forecast)
million
86%
Sept. 2008
2G:mova
50%
Jun. 2006
Number of subscriber
3G launch
Oct. 2001
3G:FOMA
2001
2002
2003
2004
2005
2006
2007
2008
2009

6. Growth of Packet Usage in DOCOMO
Flat-rate service on i-mode
June 2004
(The value of October of 2001 is assumed 1.0.)
Normalized Data Traffic per day per person

7. Trend in Communication Bandwidth1G 1G
at Low
mobility
600M
802.11n
300M
Fixed network services 4G
Peak
FTTH
Data speed [bps]
100M
100M
75M
802.16e
100M
at High
mobility
54M
54M
50M
Super3G
(LTE)
802.11g
802.11a
26M
Peak
14M
10M
11M
12M
IEEE
802.11b 8M
average
2~4M
HSPA 2M
1.5M
MAX
sepc.
INS Net1500
HSDPA&HSUPA 1M
802.11 2M
ADSL
ISDN
384k
Mobile network services
W-CDMA
100k
3rdGeneration
2ndGeneration
IEEE (WiFi)
Analog modem/ADSL/FTTH
4thGeneration
IEEE a
INS Net64
56K
64k
PHS
28.8k
32k
14.4K
28.8K
PHS
10k
9.6k
PDC
Packet
2.4k
PDC
PDC 1k 90 92 94 96 98 00 02 04 06 08 10
Year

8. 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.
W-CDMA
R99
HSDPA
Rel.5
(Category 10)
35 times
User data speed
384 kbps
max.14 Mbps
Modulation scheme
QPSK
16QAM
Coding rate
0.442
0.971
Code
utilization
0.119
0.934

9. Smooth introduction of 4G
Super 3G (LTE/3.9G)
Smooth introduction of 4G
High-level Objective
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
High data speed with Low latency and High Capacity
Smooth migration with reasonable CAPEX and OPEX
4G Spectrum 4G 4G
Super 3G
S3G
Long-term evolution of 3G
to keep competitive capability
HSUPA
HSUPA
HSDPA
HSDPA
R99
R99
Wide spread in
3G Spectrum
Start in
DOCOMO
Start in
World market
2000
2005
2010
It will be recognized to be important
that Super3G/LTE has an evolutionary path to 4G.

10. Super 3G/LTE Radio Access and RAN Architecture
Core Network
All IP Network
Ready to plug-in
4G Radio Access
MME/S-GW
Change in Radio Access Technology (Air-Interface) only IP
New RAN Architecture
・Low latency
・Low-cost simple architecture
RNC
3G RAN IP
Transport IP IP
ATM
eNB
eNB 4G
NodeB
Node B
Node B
S3G
NodeB
S3G Radio
・Low latency
・75M/300Mbps
4G Radio
・100M-1Gbps
VoIP
capable
WCDMA
(HSPA)
4G Spectrum
3G Spectrum
3G Spectrum
Ultimate enhancement using new technology elements, e.g. OFDM, MIMO
Super 3G focuses on PS domain
eNB: evolved NodeB(Super3G BTS)

11. Targets for IMT-Advanced (4G)
Recommendation ITU-R M.1645
Framework and overall objectives for the future development of
IMT-2000 and systems beyond IMT-2000
Illustration of capabilities of IMT-2000 and systems beyond IMT-2000
Systems Beyond IMT-2000 will encompass the capabilities of previous systems
100 Mbps
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
Enhancement .
New capabilities of Systems Beyond IMT-2000
IMT-Advanced 4G
Super 3G
Dashed line indicates that the exact data rates associated with Systems Beyond are not yet determined
1 Gbps

12. Schedule for IMT-Advanced
2009
2010
2011
2007
2008
ITU-R
WP5D
meetings
No 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
SDOs
ect.
Submission of candidate RIT
ARIB sets up Radio I/F proposal WG.
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
Study Item approval

13. 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 “ Requirements for Further Advancements for E-UTRA (LTE-Advanced) ” are based on the following concepts:
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

14. 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)

15. Field Experiments on 5 Gbps Packet Data Transmission
5 Gbps Packet Transmission
using 12-by-12 MIMO Multiplexing #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
#12
Received
data
Tx antenna #1 #3
Signal separation
Base-station transmitter
Mobile-station receiver

16. Part II

17. DOCOMO’s Mid-term Vision
“Change and Challenge”

18. DOCOMO’s Challenge: Service Evolution

19. Personalization of Services

20. Expansion of International Businesses

21. Evolution of Video Services

22. 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.