1.
Overview
The
B-WLL(Broadband Wireless Local Loop) is a multi-service system
designed to provide telecom service to small and medium-sized enterprises.
B-WLL system allows operators to offer rapid provision
- to a large number of client sites - of a comprehensive range of
telephone and data transmission services.
For cellular phone network operators, B-WLL system
offers the possibility of linking base station to
base station controllers. This makes B-WLL system
an economical transmission solution, for the implementation or extension
of high traffic density areas coverage.
2.
Features
- Broadband Wireless Network using internal ATM(Asynchronous
Transfer Mode) Transport
- Voice, data, and video integration at very high speeds
- Efficient packet transport with minimal throughout delay
- Microcellular point-to-multipoint distribution architecture
- Sector or omni-directional antennas at base station
- 4 Sectors(typically 90°), up to 4×34 Mbps rates per sector
from base station to subscriber(according to channel)
- Dynamic Bandwidth Allocation(DBA) on the radio path, between
the base station and the end-user
- Medium Access Control(MAC) which support ATM Quality of
Service
- Terminal Stations providing : POTS/ISDN switched services,
n×64Kbits/s, n×E1/T1 leased line and standard Ethernet 10BaseT interfaces
with bursty data capabilities
- ATM(OC3/STM1) interface support
- Automatic Backup & Restore.
- NMS(Network Management System) using HP Openview
- Digital Audio Visual Council(DAVIC) Standards
- Multiple frequency bands and frequency re-use between cells
3. System Configuration
::more>>
4. Specification
1)
Spec. of Downstream (BS to TS)
|
Channel
Bandwidth
|
14 MHz
|
28 MHz
|
|
Occupied
Bandwidth
|
13.63 MHz
|
27.25 MHz
|
|
Modulation
|
QPSK
|
QPSK
|
|
Gross Bit
Rate
|
20.19 Mbit/s
|
40.37 Mbit/s
|
|
Code
|
Convol.
7/8 (k=7)
|
Convol.
7/8 (k=7)
|
|
Interface
|
Depth 12
|
Depth 12
|
|
Code
|
Reed-Solomon(204,188,8)
|
Reed-Solomon(204,188,8)
|
|
Bit rate
before coding
|
16.19 Mbit/s
|
32.38 Mbit/s
|
|
Link Budget
|
25 GHz
|
28 GHz
|
25 GHz
|
28 GHz
|
|
RBS Output
Power
|
17 dBm
|
17 dBm
|
17 dBm
|
17 dBm
|
|
Transmit
Antenna Gain
|
15 dBi
|
15 dBi
|
15 dBi
|
15 dBi
|
|
Receive
Antena Gain
|
33 dBi
|
35 dBi
|
33 dBi
|
35 dBi
|
|
Receive
RF Signal Level
(BER = 10-10)
|
- 80.5 dBm
|
- 80.5 dBm
|
- 77.5 dBm
|
- 77.5 dBm
|
|
Equipment
Gain
|
145.5 dB
|
147.5 dB
|
142.5 dB
|
144.5 dB
|
|
2) Spec. of
Upstream (TS to BS)
|
Channel
Bandwidth
|
3.5 MHz
|
7 MHz
|
|
Occupied
Bandwidth
|
3.36 MHz
|
6.72 MHz
|
|
Modulation
|
D-QPSK
|
D-QPSK
|
|
Gross Bit
Rate
|
5.36 Mbit/s
|
10.75 Mbit/s
|
|
Code
|
Convol.
7/8 (k=7)
|
Convol.
7/8 (k=7)
|
|
Interface
|
Depth 12
|
Depth 12
|
|
Code
|
Reed-Solomon(63,53,5)
|
Reed-Solomon(63,53,5)
|
|
Bit rate
before coding
|
4.19 Mbit/s
|
8.38 Mbit/s
|
|
Link Budget
|
25 GHz
|
28 GHz
|
25 GHz
|
28 GHz
|
|
RBS Output
Power
|
12 dBm
|
12 dBm
|
12 dBm
|
12 dBm
|
|
Transmit
Antenna Gain
|
33 dBi
|
35 dBi
|
33 dBi
|
35 dBi
|
|
Receive
Antena Gain
|
15 dBi
|
15 dBi
|
15 dBi
|
15 dBi
|
|
Receive
RF Signal Level
(BER = 10-10)
|
- 84.5 dBm
|
- 84.5 dBm
|
- 81.5 dBm
|
- 81.5 dBm
|
|
Equipment
Gain
|
144.5 dB
|
146.5 dB
|
141.5 dB
|
143.5 dB
|
|
|
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