Transcript RF Deployment Strategies For MMDS.ppt

RF Deployment Strategies for
MMDS
Dale Dalesio; Product Manager
ADC The Broadband Company
Agenda
• Super-Cells
• Multi-Cells
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Super-Cell Architecture
Downstream
Super-Cell
A,B
• Enables fastest market entry
A
A
B
B
B A
B A
B A A BB C A B
B
C
AA
A C
B
A
B
B
A C Upstream
• Lowest cost
• Backhaul component small
• Broad coverage
• Low to medium capacity
• Limited ability to target
coverage and service set
offering
• 10 to 25 miles radius
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Super-Cell D/S RF
Requirements
RF Downstream
• Typical coverage; 10 - 30 Miles
• Usually tall broadcast towers; 300 - 800 feet
• Integrated with existing video service
• Mostly single sector D/S
• Higher output power per channel
– Typical transmitters are 50W or 100W Channel
– One transmitter per RF channel
– Waveguide combining technique
Downstream
Frequencies
MMDS 2500 - 2686MHz
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Super-Cell U/S RF
Requirements
RF Upstream
• Typical coverage; 10 - 30 Miles
• Usually tall broadcast towers; 300 - 800 feet
• Use of tower-top LNAs (low noise amplifier) to
overcome RF coaxial loss
– One per each sector
• Sectorized on the Upstream
– 4 sectors; 90º antennas
Upstream Frequencies
– 8 sectors; 45º antennas
MDS1
• Frequency re-use
MDS2A
MDS2
WCS
Limited MMDS
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Super-cell Base Station RF
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Super-Cell RF Facilities
Requirements
• Usually housed in a building or transmission
shelter
• Larger space required if integrated with existing
video service
Consumption
(W)
Electrical
Requirements
Air
Conditioning
50W (4) D/S
(4) U/S
9,500
80 Amps @ 220
VAC
2.5 - 3 tons
Floor Space
Required
4 or 5 cabinets
Configuration
88" to 110"
length
32" depth
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MMDS Spectrum Requirements
M1
WCS
low
A
1
A
2
A
3
A C
4 1
C
2
C
3
C E
4 1
E
2
E
3
E
4
G
1
G
2
G
3
G
4
MDS U/S
M2
WCS
high
2150 - 2162
2305 - 2320
or
and
2170-2182
2345-2360
MHz
MHz
B
1
B
2
B
3
D
1
B
4
D
2
D
3
F
1
D
4
F
2
F
3
F
4
H
1
H
2
G
1
G
2
G
3
G
4
H
3
2500 - 2686 MHz
A
1
A
2
A
3
A C
4 1
C
2
C E
4 1
C
3
E
2
E
3
E
4
MMDS U/S
B
1
B
2
B
3
B
4
D
1
D
2
D
3
D F
4 1
F
2
F
3
F
4
H
1
H
2
H
3
2500 - 2686 MHz
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Mix Cell Sizes to Maximize Flexibility
STRATEGY: Enter
market with supercell, add mini-cells
over time, may
result in complete
migration in some
markets
1. Initial Super-cell
• Gain quick market entry
2. Multi-cell Overlay
• New frequencies
• Capacity/coverage “hot
spot” fill
3. Complete Migration
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Multi-Cell Architecture
A B
C D
A B
Multi-Cell Strategy
• Incrementally add targeted
capacity, or market entry in
high-density areas
B A
D C
B A
D C
B A
D C
C D
A B
C D
Upstream & Downstream
• Use of buildings, broadcast,
and wireless tower sites
• Medium coverage
• Medium to high capacity
• Relatively fast to deploy
• 3 - 7 miles radius
• Multiple modulations address intra- and
inter-cellular interference
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What’s needed for Multi-Cell RF
Systems
• Reduce capital cost of RF
• Scaleable Multi-sector cell support
– Use the bandwidth
• Smaller size for hub equipment
• Quick and efficient hub deployments
• Less customization; standard repeatable hub
configurations
• Improved efficiency
• Very low maintenance and downtime
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Axity Multi-cell Base Transceiver Station
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Axity BTS
Axity BTS
D/S (IF to RF) & U/S (RF to IF)
• Broadband Design; supports single
channel or multi-channel signals.
• Modulation independent
– supports QPSK, 16QAM; 64QAM; OFDM
• Each chassis supports up to 4 sectors
with redundancy; additional sectors
supported with optional configurations
• Independently scalable upstream or
downstream configurations
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Integrated BTS
• Complete modular integration
• Downstream components
– RF transmission; MMDS upconversion, amplifier,
output filter
• Upstream components
– RF reception; LNA, MMDS receive and downconversion
• Other network equipment
– Frequency reference standard; GPS; ABS controller;
Input and output switch matrices
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Axity Deployment
Configurations
• Co-locate with access
equipment
– Indoor or outdoor
configurations
• RF remotely located from
access equipment
– Ideal for RF roof-top
installations with access
equipment
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BTS Configurations
RF Co-located
TX & RX
Antennas
PSTN
Wireless Hub
VoIP
G’way
Private
IP
Axity RF BTS
Internet
B/W
Manager
Wireless Modem
Termination
System (WMTS)
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BTS Configurations
RF located remotely
Axity
RF
BTS
TX & RX
Antennas
PSTN
Wireless Hub
VoIP
G’way
Private
IP
IF Transport
Internet
• RF remotely located
from access equipment
– If multiplexed and
transported to RF BTS
B/W
Manager
Wireless Modem
Termination
System (WMTS)
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Axity Multi-cell Base Transceiver Station
Axity BTS
Available now

N+1 Redundancy; downstream and upstream

10W average per sector - multi-carrier

25W average per sector - single carrier

SNMP interface

Internal 10MHz reference and GPS

Indoor or outdoor configurations

Hot swappable and replaceable modules
Frequencies
Supported
MMDS D/S
MDS U/S
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RF BTS; What is Coming
Axity BTS
Mid 2001
• 20W average - multi-carrier
• 50W average - single carrier
 Programmable downstream output power in eight 2dB
steps
 Programmable upstream gain of downconverter in eight
2dB steps
 -48V configuration w/integrated battery backup
 Single CAM replaces individual Control boards
 Enhanced monitoring, control and status
Frequencies Supported
D/S
MMDS
U/S MDS, WCS, MMDS
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Redundancy
IF
Input
RF Output
MMDS
RF Output
D/S
RF
Transfer
Switches
D/S Sector
O/P Filter
Status/
Control
Automatic
Backup
Controller
Control/
Status
Control
Comm
D/S Input
IF Switch
IF
Input
Auxiliary
Sector
RF Output
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Multi-Cell vs. Super-Cell
Configuration
Floor Space
Required
Consumption
(W)
Electrical
Requirements
Air
Conditioning
Multi-Cell
Axity BTS
10W (4) D/S
(4) U/S
44"x36"
4,650
30 Amps @ 220
VAC
1 - 1.5 tons
Size by 50%
Multi-Cell
configuration
15W (4) D/S
(4) U/S
Axity BTS
Reduces:
88"x36"
7,500
50 Amps @ 220
VAC
2 – 2.5 tons
110"x36"
9,500
80 Amps @ 220
VAC
2.5 - 3 tons
Power
Consumption by
40%
Super-Cell
50W (4) D/S
(4) U/S
99
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Multi-cell Base Transceiver Station
Multi-cell architecture can:
• Reduce capital RF hub costs by 50%
• Reduce space requirements by 50%
• Reduce Power Consumption by 40%
Increase capacity through
more efficient use of the
MMDS bandwidth.
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