Public Safety Distributed Antenna Systems
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#DASCongress Public Safety Distributed Antenna Systems Meeting Public Safety Mandates with a Commercial Carrier Upgrade Pathway
Transcript of Public Safety Distributed Antenna Systems
#DASCongress
Public Safety Distributed Antenna Systems
Meeting Public Safety Mandates with a Commercial Carrier Upgrade Pathway
#DASCongress
VIDEO
Case Study
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Case Study Consolidated Forensic Laboratory (CFL) - The Challenge
– LEED Certified Building – 300K sq. feet – Two Sub Basements – Critical Radio Requirements – Poor Coverage PS – Poor Commercial
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– ADX Fiber DAS – PSR 700/800 BDA – UHF BDA Passive Overlay – Commercial Upgrade Path
Case Study Consolidated Forensic Laboratory (CFL) - The Solution
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What’s Driving Requirements for Public Safety DAS?
Requirement Drivers
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NFPA 2010 - Background and Details – Alarming – NEMA 4X Enclosures – Battery Backup Power – New Venues – Major Renovations NFPA 2012 – All Venues Must Demonstrate Compliance
NFPA 2010 and NFPA 2010
Requirement Drivers
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– Jurisdictions Adopt Code by Year – Enforcement and Compliance
Varies – Pre-Deployment Test – Post Deployment Test
Adoption, Enforcement and Compliance
Jurisdiction and Current Coverage Determine Need
Requirement Drivers
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What are the technical challenges for upgrading an existing PS DAS to include
Commercial Services
Technical Challenges
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Commercial and PS Bands
Commercial Bands Public Safety 700/800 Public Safety UHF/VHF
Primarily Broadband Narrowband and Broadband Narrowband
Uniform TX-RX Separation Uniform TX-RX Separation Potentially Interleaved Frequencies
3 or 5 MHz spacing for UHF
700 – 2100 MHz Emerging 700 MHz Data 136-174 MHz and 450-512 MHz
Voice and Data Services Primarily 2-way Voice Primarily 2-way Voice
< ½ W Mobiles 2-5 Watt Portables 2-5 Watt Portables
Challenging Filtering
Different Challenges for Each Category
Technical Challenges
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Propagation Coverage Mismatch
Low Band
High Band
Commercial Service Include and Low High Bands
Public Safety Includes Low
Technical Challenges
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Propagation Coverage Mismatch
Frequency (MHz)
Free Space Loss (dB)
136 44.78
450 55.17
800 60.17
850 60.70
1900 67.68
2100 68.55
36.56 + 20Log10(Frequency) + 20Log10(Distance in miles)
Technical Challenges
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Transmit Power Portable versus UE
2-5 Watts Bursty Voice
< ¼ Watt Bursty Data Continuous Voice
Serving Antenna
Develop Link Budget to Accommodate Both
Technical Challenges
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Intermodulation
More Services -> More Potential for intermodulation Interference
Analyze in Advance Separate Layers Low PIM Products Broad and Narrow Band
f1 f2 IM3 IM3
Technical Challenges
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Inter-layer Interference
Check Noise Levels with and without Other Layer On
Challenges In Band Noise Rise
In Band Interference Adjacent Band Noise Rise
Technical Challenges
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Interference from 700/800 PS Portable
Check Noise Levels with and without Other Layer On
DAS Frequency Band PS Portable Challenges 800 MHz 800 MHz NB In Band Interference SMR 800 800 MHz NB Adjacent Power
700 MHz Upper C 700 MHz D Adjacent Power
Technical Challenges
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Same Layer Interference
Check Common and Adjacent Spectrum Across Layers
Challenges In Band Noise Rise
In Band Interference Adjacent Band Noise Rise
Commercial + 700/800 PS
Technical Challenges
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Planning and Implementing your
upgrade
Commercial Services Upgrade
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Owner or Manager
Planning
Engage Stakeholders Early
Wireless SPs
Tenant/End User
Integrators
Commercial Services Upgrade
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Planning
Integrated Overlay or Separate System
UHF / VHF
Commercial and 700/800 MHz
Commercial Services Upgrade
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Planning
Prepare Infrastructure For Commercial Upgrade
Include Spare Fiber Strands
Design/Build Passive Net For Future
Overlaid Services/Bands
Commercial Services Upgrade
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Planning
Plan for Additional Space, Power and Environmental Requirements
Room for Additional Active Components Power and AC for Additional Components Include BTS or BDA Signal Source
Commercial Services Upgrade
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Implementation
No Service Disruption Re-Test Public Safety Coverage Plan Maintenance Operations and Access
Separate Overlay or Pre-Installed Infrastructure
Commercial Services Upgrade
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What’s options are available for funding the upgrade?
Funding Solutions
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Commercial Upgrade – Potential Funding Sources
• CARRIER FUNDING – Carrier Participation Fee – Capital Investment – Lower Subscriber Fees
• TENANT FEES • NEUTRAL HOST
More Committed Subscribers More Likely Scenario
Funding Solutions
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No Outside Funding Options
Commercial –> Public Safety
Public Safety DAS First Explore Commercial Options
Build Commercial DAS
Funding Solutions
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PS Infrastructure Provides Path to Commercial
Build Infrastructure to accommodate Commercial Upgrade
Carrier Participation Still Subject to Carrier ROI,
but Investment is Reduced by existing Infrastructure
Summary
