Presentation from IWCE 2010 "Wireless Surveillance 101" workshop, focused on high-bandwidth wireless infrastructure for fixed and mobile real-time video surveillance. Read notes on the workshop here: http://kseniacoffman.wordpress.com/2010/03/11/definitions-of-wireless-mesh/

1. Wireless Infrastructure for Security & Surveillance
Ksenia Coffman, Firetide
IWCE 2010: Wireless Surveillance 101
March 9, 2010
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2. Agenda
Why wireless?
Wireless options
Considerations for wireless video systems
Case studies
Municipal public safety; Industrial operations;
Transportation security
Planning a successful wireless system
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3. Why Wireless?
Cost savings
Deploy virtually anywhere
Mobility and flexibility
Extend or back-up wired
infrastructure
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4. Who Needs Wireless Surveillance?
Public Safety Education Industrial Transportation
Government Utilities Telecom
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5. Wireless Challenges
Availability of channels & spectrum
RF interference
Dynamic RF & physical environment
“Trust but verify” attitude required
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6. Wireless Options
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7. Wireless Frequency Bands
Licensed? Line of site Advantage Disadvantage
900 MHz Unlicensed Not required Improved street-level Lower throughput
penetration for video compared
to other bands
2.4 GHz Unlicensed Required Better penetration Interference from
compared to 5 GHz consumer devices
4.9 GH Licensed Required Reserved for public Requires frequency
safety; less coordination with
interference other agencies
5 GHz Unlicensed Required Better range and less Lower penetration
interference than 2.4 GHz
compared to 2.4 GHz
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8. Point to Point
Pros
Dedicated connection
Highest bandwidth for backhaul
Cons
Does not scale; no flexibility
Single point of failure
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9. Point to Multi-Point
Pros
Simplicity of design
Cost effective when tall assets are available
Cons
Limited scalability: bandwidth divided by # of subscribers
LOS required to each subscriber unit
Base station creates a single point of failure
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10. Multi-Point to Multi-Point (Mesh)
Pros
Reach & scalability with multi-hop connections
Flexibility – can be deployed a PtP, PtMP or mesh
Cons
Variable performance from different vendors
More complex design vs PtP or PtMP
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11. What About Throughput?
Point to point
Up to 1 Gig+
Point to multi-point
20-30 Mbps total capacity typical (divided by # of subscribers)
Wireless mesh
Can deliver up to 250-300 Mbps in PtP mode or 100-150 Mbps
sustained over multiple hops
Varies greatly by vendor: from 10-15 Mbps to 100-150 Mbps per
radio
Numbers listed are usable throughput, not theoretical data rate
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12. Deployment Scenario: Mesh & PtP
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13. Deployment Scenario: PtMP
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14. Deployment Scenario: Linear Mesh
District 5
District 4
District 3
District1
District 2
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15. Not All ‘Wireless Mesh’
Created Equal
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16. Imagine a Traditional Wired Switch
Most efficient mesh utilizes L2 distributed wireless switch architecture
(Wired Ethernet infrastructure)
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17. Now, Give Each Port Wireless Capability
(Wired Ethernet infrastructure)
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18. Separate the Ports…
Bingo, a Virtual Ethernet Switch!
(Wired Ethernet infrastructure)
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19. Key Requirements for Video
High throughput
Low latency < 1.5 ms per hop
Low packet jitter (variation in latency)
Support for multicast traffic
End-to-end QoS & traffic prioritization
Specialized infrastructure required
APs not suitable for professional video surveillance
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20. Wi-Fi Access Can Be Useful
Live video in Wi-Fi ‘hot spots’
Laptops, PDAs
Local and remote viewing
Wi-Fi enabled Radio, AP & Camera
patrol car
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21. Mistakes You Can Make
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22. ERROR: undefined
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STACK: