RF Deployment Strategies for MMDS

Dale Dalesio; Product ManagerADC The Broadband Company

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Agenda

• Super-Cells• Multi-Cells

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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

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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 FrequenciesMMDS 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– 8 sectors; 45º antennas

• Frequency re-use

Upstream FrequenciesMDS1

MDS2AMDS2WCS

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

Configuration Consumption(W)

ElectricalRequirements

AirConditioning

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

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*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

**

* * ** *

** **

** **

* * ** *

* * ** *

** **

* * ** *

***

***

*

*

* *

**

*

*

*

*

*

*

* *

*

*

*

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Multi-Cell Architecture

• 3 - 7 miles radius• Multiple modulations address intra- and

inter-cellular interference

Upstream & Downstream

A BB A

B AA B

A BB A

C DD C

D CC D

D CC 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

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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 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

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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 down-

conversion• 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 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

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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

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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 SupportedMMDS D/SMDS U/S

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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 SupportedD/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

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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

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Axity BTS Reduces:

Size by 50%Power

Consumption by 40%

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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.