An example of System Implementation of
Broadband Wireless Access in Japan
Contents
Broadband Access by “Fiber + Radio”
-Overview of Wireless Access and Broadband Services
-WIPAS (Wireless IP Access System)September 10th , 2004
Kazuhiko INOUE
-Broadband Access by “Fiber + Radio”: WIPAS
-Characteristics of WIPAS
-Examples of Broadband Services by “Fiber + Radio”
NTT Access Network Service Systems Laboratories
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1
Classification of Wireless Access Systems
Network
Service
System
Customer
System
ISP
Areal deployment
NTT central office
MWA
Internet
Mobile applications
Internet café
Node Equip.
Radio LAN
NWA
FWA
Portable Customer ’s
premise
equipment
AP
Public space
Public
Network
WT
AP
(million)
10
10.27 (’03.12)
HFC (CATV)
1
2.48 (’03.12)
ADSL
0.1
FTTH
0.89 (’03.12)
RLAN
0.01
(still-use)
AP
Spot deployment
STB
TV
LAN
AP
Office building
Broadband Service Market in Japan
Amount of subscribers
? FWA (Fixed Wireless Access) … ex. Broadband Access by
“Fiber+Radio”
? NWA (Nomadic Wireless Access) … ex. “Hot Spot” service
? MWA (Mobile Wireless Access)
… ex. Cellular phone
? Radio LAN
… ex. RLAN for office (indoor)
? Wireless Home Link
… ex. RLAN for home user, Bluetooth
AP
WT
PBX
LAN
AP: Access Point
WT: Wireless Terminal
radio link
Game Machine
PC
Wireless Home Link
0.001
’ 00.06
’ 00.12
’ 01.06
’ 01.12
’ 02.06
’ 02.12
’ 03.06 ’ 03.12
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WIPAS: Wireless IP Access System
Broadband Access by “Fiber+Radio”
Broadband Wireless Access, compatible speed to FTTH
…Fiber Optic Cable + WIPAS (Wireless IP Access System)
Residential area
WIPAS is the Broadband FWA (Fixed Wireless Access) system that consists of AP
(Access Point) and WTs (Wireless Terminal) employing upper SHF: 26GHz band.
Transmission rate of the wireless section is 80Mbit/s (Maximum transmission rate
of Ethernet is 46Mbit/s ), which is shared among the plural WTs.
Radio
Installation at veranda
· Transmission rate
16QAM: 80 Mbit/s (46Mbit/s)
QPSK : 40 Mbit/s (23Mbit/s)
Urban area
? (
Fiber
IP network
) : Maximum transmission
rate of Ethernet frame
Omniantenna
R F U
Undereaves
install
ation
WT
( 18c m planar
antenna)
AP with Omniantenna
On-pole installation
Hub Station
3
WIPAS System Design Concept
Conventional Systems
(mainly for Business users)
WIPAS
(for SOHO/Consumer users)
Technical Specifications of WIPAS
…conformable to ARIB STD T 58( P-P) / T 59 ( P-MP)
Frequency Band
Communication Scheme
(1) Services
Telephone
/ Leased line/(IP)
Symbol Speed
Modulation Scheme
Focus on IP Services
(Maximum forward rate of
Ethernet frame)
(2) Transmission Range
A few kms
Transmission Power
Up to 1 – 2 km
(in Japan, climatic zone K)
Maximum Number of
Subscriber
Network Interface
User Interface
(3) Installation Site of AP
Building Rooftop
/Tower
Wireless Transmission Speed
Telephone Pole
Antenna Gain
Access
Point (AP)
CPE (WT)
Transmission Range
Bandwidth Control
26 GHz band
TDMA/dynamic TDD
20M Symbol/Sec
Adaptive Modulation (16QAM/QPSK)
QPSK: 40 Mbps (23 Mbps)
16 QAM: 80 Mbps (46 Mbps)
QPSK : 14dBm
16 QAM : 11.5dBm
239 Subscriber Stations per Access Point
100 Base-TX or 100 Base-FX
(Interactive service can be attained by one optic fiber)
100 Base-TX or 10 Base-T
Horn Antenna (5.5 dBi )
Omni Directional Antenna (6 dBi)
18cm Flat Antenna (31.5dBi)
1-2 km (Line of Sight)
-Fairness Queuing Control by Round-robin
-Minimum Bandwidth Grant by Priority Queuing
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Overview of WIPAS Equipment
Variations of System Configuration
Customer’s
premise
- P-P access line / entrance line
AP-RFU
Ethernet
cable (*)
Omni-type
Horn-type
IP network
Telephone
pole
Power cable
PC
WT
Size: 150φ x 600 mm,
260φ x 120 mm
Weight:7 kg (omni-type)
3 kg (horn-type)
Ethernet
cable
WT
Optical fiber cable
IP network
WT-adapter
AP-IFU
WT-RFU
WT
AP
WT
WT
- P-MP cascading
Size: 90 x 40 x 36 mm
Weight: 0.1 kg
Size: 190 x 190 x 55 mm
Weight: 2.0 kg
AP:Access Point
WT:Wireless Terminal
RFU: Radio Frequency Unit
IFU:
Interface Unit
Size: 270 x 320 x 160 mm
Weight: 14 kg
(*) Vacant cores within Ethernet cable are used for power
supply to WT.
WT
AP
IP network
AP
5
WT/AP Installation Images
Veranda railing
Concrete fence
Indoor (window glass)
Examples of Broadband Services by “Fiber + Radio”
- Suburban redidential areaDense deployment in Haramachi city
• designed to have more than 80 % LOS with premises in the cell
W
T
Dedicated pole
Common pole
Building rooftop
Radio
A
P
8 km
WT
Satellite antenna
Fiber
10 km
6
Installed AP at suburban residential area
Examples of Broadband Services by “Fiber + Radio”
- Urban redidential spotSpot deployment at apartment houses
• fiber construction problems due to architectural limitations
AP-RFU
Share connection of up to 46 Mbps download
and up to 32 Mbps upload
Radio
100BASE-TX
/10BASE-T
AP installed at a park in residential area.
FWA Antenna
AP-IFU
Duct hole of
air -conditioner
Fiber
Veranda etc.
Subscriber equip.
Aerial view of residential area
AP
Telephone pole etc.
Apartment house,
multi-use building etc.
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Installed Equipment at urban spot area
(1) AP( Installation height: 8-10m)
RFU
(2) WT
Examples of Broadband Services by “Fiber + Radio”
- NWA/RLAN Backhaul Radio
IFU
WIPAS
AP
RLAN
PDA
WIPAS AP is installed at the
point that can keep line-ofsight between AP and WTs.
PC
RLAN
PDA
Fiber
WIPAS
WT
PC
RLAN
Example of installation on a tree
PDA
PC
Power is supplied from nearby 100VAC
or portable power generator.
RLAN
AP Box
NWA/RLAN
WIPAS
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Required Technologies for Higher Speed
“Fiber + Radio” FWA
Background
· Digital broadcasting services has been started in 2003 in Japan.
· Last-one-hop problem is still essential.
Key technologies
High speed
( >100 Mbit/s)
·
·
·
·
·
Frequency resource management
Multi-level modulation
Selected beam antenna
Transmitter power problem
Higher efficiency for MAC
Summary
-Broadband Access by “Fiber+Radio” may be useful
concept for deploying of Broadband Wireless Access
Network.
-FWA systems using upper SHF band (for example:
26GHz band) can be introduced in Broadband Access
Sevice Network effectively.
-Higher speed capability of FWA will be also required
as complement for FTTH in the future.
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