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3
A B
B A
Super-Cell Architecture
• 10 to 25 miles radius
Downstream
Upstream
AB
AA
A
B
BB
A B
B A
Super-Cell
• Enables fastest market entry
• Lowest cost
• Backhaul component small
• Broad coverage
• Low to medium capacity
• Limited ability to target coverage and service set offering
A
A
A
AB
B B
BC
C
C
C
A,B
4
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
5
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
– 8 sectors; 45º antennas
• Frequency re-use
Upstream Frequencies
MDS1
MDS2A
MDS2
WCS
Limited MMDS
7
Super-Cell RF Facilities Requirements
• Usually housed in a building or transmission shelter
• Larger space required if integrated with existing video service
ConfigurationConsumption
(W)Electrical
RequirementsAir
Conditioning
50W (4) D/S (4) U/S
9,500 80 Amps @ 220VAC
2.5 - 3 tons
Floor SpaceRequired
4 or 5 cabinets 88" to 110"length
32" depth
99
8
MMDS Spectrum Requirements
M1
M2
2150 - 2162or
2170-2182
MHz
2500 - 2686 MHz
MDS U/S
MMDS U/S
H1
H3
H2
B1
B4
B3
B2
D1
D4
D3
D2
F1
F4
F3
F2
2500 - 2686 MHz
C1
C4
C3
C2
E1
E4
E3
E2
G1
G4
G3
G2
A1
A4
A3
A2
A1
A4
A3
A2
B1
B4
B3
B2
D1
D4
D3
D2
C1
C4
C3
C2
E1
F1
F4
F3
F2
E4
E3
E2
H1
H3
H2
G1
G4
G3
G2
WCS low
WCS high
2305 - 2320and
2345-2360
MHz
9
*1. Initial Super-cell• Gain quick market entry
Mix Cell Sizes to Maximize Flexibility
*
**
*
**
*
*
2. Multi-cell Overlay
• New frequencies
• Capacity/coverage “hot spot” fill
STRATEGY: Enter market with super-cell, add mini-cells over time, may result in complete migration in some markets
3. Complete Migration
**
* * ** *
** **
** **
* * ** *
* * ** *
** **
* * ** *
***
***
*
*
* *
**
*
*
*
*
*
*
* *
*
*
*
10
Multi-Cell Architecture
• 3 - 7 miles radius
• Multiple modulations address intra- and inter-cellular interference
Upstream & Downstream
A B
B A
B A
A B
A B
B A
C D
D C
D C
C D
D C
C D
Multi-Cell Strategy
• Incrementally add targeted capacity, or market entry in high-density areas
• Use of buildings, broadcast, and wireless tower sites
• Medium coverage
• Medium to high capacity
• Relatively fast to deploy
11
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
13
Axity BTS
Axity BTSD/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
14
Integrated BTS
• Complete modular integration
• Downstream components
– RF transmission; MMDS upconversion, amplifier, output filter
• Upstream components
– RF reception; LNA, MMDS receive and down-conversion
• Other network equipment
– Frequency reference standard; GPS; ABS controller; Input and output switch matrices
15
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
16
BTS ConfigurationsRF Co-located
PSTN
Wireless Hub
Axity RF BTS
Wireless Modem Termination
System (WMTS)
Private IP
Internet B/W Manager
VoIP G’way
TX & RXAntennas
17
BTS ConfigurationsRF located remotely
PSTN
Wireless Hub
IF Transport
Wireless Modem Termination
System (WMTS)
Private IP
Internet B/W Manager
VoIP G’way
TX & RXAntennas
Axity RF
BTS
• RF remotely located from access equipment– If multiplexed and
transported to RF BTS
18
Axity BTSAvailable now
Axity Multi-cell Base Transceiver Station
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
19
Axity BTSMid 2001
RF BTS; What is Coming
• 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
RF Output
Status/Control
IFInput
RF Output
Comm
IFInput
D/S Input IF Switch
Automatic Backup
Controller
Auxiliary Sector
MMDS RF OutputD/S
RF Transfer Switches
Control/Status
Control
O/P FilterD/S Sector
21
Multi-Cell vs. Super-Cell
ConfigurationFloor Space
RequiredConsumption
(W)Electrical
RequirementsAir
Conditioning
Multi-CellAxity BTS
10W (4) D/S (4) U/S
44"x36" 4,650 30 Amps @ 220VAC
1 - 1.5 tons
Multi-Cellconfiguration
15W (4) D/S (4) U/S
88"x36" 7,500 50 Amps @ 220VAC
2 – 2.5 tons
Super-Cell
50W (4) D/S (4) U/S
110"x36" 9,500 80 Amps @ 220VAC
2.5 - 3 tons
99
Axity BTS Reduces:
Size by 50%
Power Consumption
by 40%