InBuilding Working Group Report

1
In-Building Working Group Report

• Stu Overby - Chair, In-Building WG
• Jack Daniel - Vice-Chair In-Building WG
• NPSTC- Seattle, WA
• September 16, 2008

2
Overview Status

• NPSTC Best Practices for In-Building
  Communications whitepaper 2008 outreach efforts
• IAFC, Denver in August
• APCO in Kansas City in August
• IACP LEIM in Nashville in May
• IWCE in Las Vegas in February
• Article in NPSTC newsletter
• WG currently developing Best Practices for
  In-Tunnel Communications Systems
• 8 companies participating
• Targeting November meeting for distribution to GB

3
Best Practices for In-Tunnel Communications
Outline (page 1 of 4)

• 1. Executive Summary and Background
• 2. Basic System Components for In-Tunnel Coverage
  
• 2.1 Donor Site
• 2.2 Signal Boosters (BDAs)
• 2.3 Signal Distribution
• 3. Types of Tunnel Systems
• 3.1 Pedestrian
• 3.2 Vehicular (auto, bus, truck)
• 3.3 Transit (subway, rail)
• 4. Understanding the Spectrum Environment
• 4.1 Intermod Interference
• 4.2 Cross Band Interference
• 4.3 Time Domain Interference
• 4.4 Inter-system Interference, e.g., Commercial
  to PS
• 4.5 Regulatory Considerations to Minimize
  Interference

4
Best Practices for In-Tunnel Communications
Outline (page 2 of 4)

• 5. System Design Considerations and Tradeoffs
• 5.1 Harsh Tunnel Environments
• 5.2 Design for Installation Maintenance
• 5.3 Specifying coverage expected (e.g., moving,
  stationary, etc)
• 5.4 Specifying Delivered Audio Quality
• 5.5 Choosing the Donor Antenna and Antenna Site
• 5.6 Balancing uplink/downlink coverage
• 5.7 Link Budget Margin Factors Specific to
  Tunnels
• 5.8 Choosing Appropriate Power Levels
• 5.9 Accounting for Dynamic Range
• 5.10 Maintaining Uplink/Downlink Isolation
• 5.11 Attaining Sufficient Adjacent Channel
  Selectivity
• 5.12 Minimizing Time Domain Interference
• 5.13 Keeping Noise Floor Low

5
Best Practices for In-Tunnel Communications
Outline (page 3 of 4)

• 6. Signal Distribution Methods and Tradeoffs
• 6.1 Greenfield vs. Overlay on Existing System
• 6.2 Leaky Coax
• 6.3 RF Over Fiber
• 6.4 Distributed Antenna System
• 6.5 DAS Options Active, Passive, Hybrid
• 7. Coverage Testing
• 7.1 Benchmarks
• 7.2 Limitations of testing in Tunnel
  Environments (e.g., no GPS, scheduling, etc.)
• 7.2 Testing Methods Summarize and reference
  TSB-88
• 8. Ensuring Reliability
• 8.1 Remote Control and Alarm
• 8.2 Backup Emergency Power
• 8.3 Redundancy

6
Best Practices for In-Tunnel Communications
Outline (page 4 of 4)

• 9. Maintenance
• 9.1 System Deterioration Due to Tunnel
  Environment
• 9.2 Planning/scheduling considerations
• 9.3 Maintenance Checklist
• 10. Summary
• Status Contributions of material for most
  sections received
• Next Steps
• Assemble complete draft (10/15)
• Review/edit in Work Group Technology Committee
  
• Provide to NPSTC Support Staff for format
  cleanup (11/08)
• Distribute to Governing Board for review
  approval (11/18)
• Finalize, including any Governing Board input
  (per GB sched)
• Place on NPSTC web site (early December)
• Begin outreach efforts (December 2008/January
  2009)