Transcript Communications Research Laboratory

Experiments using Stratospheric platform1
(July 2002 at Hawaii)
Pathfinder-Plus
• Wing length: 36.3m
• Wing width: 3.4m
• Propeller: 8-DC motors
• Payload: 50kg
• Mission power: 600W
• AeroVironment developed for NASA (Environmental
Research Aircraft and Sensor Technology)
• In 1998, The world first unmanned flight at 24 km
altitude with solar power.
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IMT-2000 Experiments at 20km altitude
Evaluations on
 communications
performance
 access in a long
time delay
 payloads in
stratospheric
2 GHz
environment
2 GHz
User terminal
Ground
Base
station
Experiments on
Mobile phone
(DoCoMo FOMA) 


Voice (12kbps)
Video (64kbps)
Internet (384kbps)
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Key Technologies in
Broadband Wireless Access Networks
Ｍｏｄｕｌａｔｉｏｎ /Signal
Smart Antenna
Network Architecture
Transmission
● Algorithms
● Interference suppression
● Digital beam forming
● IP packet control
● Wireless QoS
● Microcell structure
● Seamless service
● High-speed
● High-performance
● High-capacity
Access Link
3
Software Radio
Base
Station
Optical Link
Propagation
● Microwave & Millimeter -wave
● Wideband Propagation
EMC & Hazards to Human
Microcell
Radio on Fiber
RF Device
● High-efficiency Power Amplifier
● Ultra-low Temperature Receiver
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Three Categories of
Future Mobile Communications

New Generation Mobile Communications
–
–
–
–

Broadband access (High data rate)
High mobility
Several systems coexist
Seamless connections to different systems
Ad-hoc Wireless
– Bluetooth
– Ultra Wide Band

Information Barrier Free
– Wireless support for senior and handicapped people
– Easy access to the Information for social activities
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Bluetooth

2.4 GHz unlicensed wireless communications
– Very short range access (10-100 m)
– WPAN(Wireless Personal Area Network)
– Ad-hoc communications

Network
– Point to Point / Point to Multi-point （Max ７ slaves）

Data rate
– 1 Mbps

Cell
Master
Slave
– Pico cell
Slave
Slave
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Bluetooth
Comparison with other systems
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Bluetooth
HomeRF
IEEE802.11b
Output power
0 dBm/20 dBm
10mW/MHz
10mW/MHz
Service area
10m/50m
50m-200m
50m-200m
0.3m/5m
1 Mbps
0.8 Mbps/1.6 Mbps
11 Mbps
4Mbps/115kbps
8
128
128
10
2.4 GHz
2.4 GHz
2.4 GHz
Optical
FHSS
FHSS
DSSS, FHSS
Data rate
User terminals
Frequency
Access
IrDA
http://www.bluetooth.com
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Ultra Wide Band (UWB) Wireless

Regulation
– 2002.2, FCC permits the marketing and operation of UWB
technology in 3.1GHz-10.6GHz.

UWB main characteristics
– Ultra wide band frequency over 1.5 GHz
– No carrier frequency
– Ultra high speed pulse (nano second order) radiations

Applications for ultra high speed data transmissions
– Make AV and USB cables wireless (faster than Bluetooth)
– Positioning
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Ultra Wide Band (UWB) Wireless
http://wca.org/Year1999/laine/sld001.htm
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Three Categories of
Future Mobile Communications

New Generation Mobile Communications
–
–
–
–

Broadband access (High data rate)
High mobility
Several systems coexist
Seamless connections to different systems
Ad-hoc Wireless
– Bluetooth
– Ultra Wide Band

Information Barrier Free
– Wireless support for senior and handicapped people
– Easy access to the Information for social activities
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Aging Society
in the case of Japan
Population （Million）
17.2%
Population
120
35.0%
100
30.0%
25.0%
80
20.0%
60
40
Over 65 Years
Under 65 Years
Ratio of over 65 years
15.0%
10.0%
20
5.0%
0
0.0%
Ratio of over 65 years old （％）
Age
1995 2000 2005 2010 2015 2020 2025 2030 2035 2040 2045 2050
Year
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Mobile Communication System for Aged
using Networks
Real-world
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Aged Users
assistance of recognition,
actuation and
information access
Information post
& Environment monitor
Mobile terminal
Assistant Vehicle
information
Computer
networks
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Example of System connected to Networks
No obstacles
here.
get information
via internet
How can I
get to the
station ?
Nothing is
coming
from here.
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Computer Networks
Information post and
Environment Monitor
Camera
OK.
A bicycle is
coming!
Be careful!
Mobile terminal
Get on a bus at two
blocks ahead.
You can walk safety
now.
Don’t worry.
O.K. I’ll wait
at the corner
till it goes past.
Assistant mobile vehicle
He is looking aside
now.
But no problem!
I’ll avoid the puddle.
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Assistant Vehicle (prototype)
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Information post and
Environment Monitor
Camera
Touch Panel
GPS
Camera
PC
Wireless LAN
Infrared, Supersonic
Sensors
Battery
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Prototype System
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Monitor and Assistant vehicle
Information & Monitor
Mobile communication
PC
Monitoring of
a road with people, bike, dog etc.
Wireless LAN
Recognition
of objects
Recognition of
road traffic
Vehicles
Infrared sensor
Ultrasonic sensor
Obstacles
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Demonstration
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2002.3月、２日間、４回のデモ
NHKニュース（17時,19時）等で放映
日経新聞など多数掲載
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Demonstration Experiments
2002/3/13
NHK News
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Support System for Deaf using PDA
-Evaluation experiments at Museum-
Location data
Information
data server
Location detection
server
Infrared
Sensor
URL access
Wireless LAN
Wireless LAN
Streaming data
URL data
Location
detection
Infrared tag
Finger language animation
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Conclusion
 The Technical keywords of the future mobile
communications are:
– “broadband access to the backbone networks”
– “IP-based seamless roaming among different
systems”.
 The Social keywords of the future of mobile
communications are:
– “Barrier free” for aged and handicapped
– “Security” for safe social activities
– Not necessarily broadband networks
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