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DC Wireless PS Communications

Government of the District of Columbia Office of the Chief Technology Officer Public Safety Wireless Communications Wireless Accelerated Responder Network (WARN). DC Wireless PS Communications. Dedicated to public safety 2 x 1.25 MHz channels in 700 MHz whitespace with experimental license

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DC Wireless PS Communications

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  1. Government of the District of ColumbiaOffice of the Chief Technology OfficerPublic Safety Wireless Communications Wireless Accelerated Responder Network (WARN)

  2. DC Wireless PS Communications

  3. Dedicated to public safety 2 x 1.25 MHz channels in 700 MHz whitespace with experimental license N=1 (same frequency use at three sectors per site) Flash-OFDM 12 sites (3 – sectored) Secure network within District WAN On separate SONET ring – no intermediate electronics Uses same sites as LMR net – using existing redundant infrastructure PC Card and PAD Access App and user QoS 19 Agencies, including three Federal, and over 200 users WARN Overview

  4. WARN Results • Average throughput of 1 Mbps and 300 kbps on downlink and uplink (respectively) • 200 kbps at 95th percentile outdoor coverage - 68 mi2 total • High Reliability: 99.997% availability in 2006 • Low latency (30 – 50 mS) • Main use around significant events, driven by streaming video (up to 10 Gbytes in day with 56 active users)

  5. WARN Results (Cont.) • First use – January 20, 2005 • Six users streamed 5 GBytes during the Presidential Inauguration in 2005 • Motion JPG video application caused overloading condition on downtown cells • Average more than 25 Gbytes per month • Applications • GIS (3D imagery) • Streaming Video • Web • E-Mail • Desktop Extension…

  6. Video: Tradeoff in codecs between flexibility and efficiency 100 kbps is adequate for most video applications using advanced codecs Need dymanic codecs and blocking to properly manage access and QoS Applications: Need to plan now for interoperable data (esp. video) Bandwidth control is critical: Much different than voice Hundreds of times different load between users. Managing capacity real-time will be crucial. Throughput: Cell edge throughput critical, especially for streaming video Devices: need PDAs, embedded modems, AVL modems, small form factors in addition to PC Cards WARN Lessons Learned

  7. NCR is a UASI designated Metropolitan Washington, DC area: 18 jurisdictions over 3 states with state and local governance NCR Interoperability Program: Fixed Broadband, Regional Wireless Broadband Network (RWBN), Data Exchange Hub RWBN: Regional broadband network(s) with seamless interoperability Waiver for broadband operations ongoing (11/14 reply comment) in advance of Eighth NPRM, overwhelming national support Working with Region 20 – broadband allowance in R20 plan Clear TV spectrum due to LP-TV RFP out to build network, contract expected end of year First phase build-out in 1H07 Projecting ~100 sites to cover 2,500 square miles, delivering peak speed of more than 930 Mbps with only one 1.25 MHz channel region-wide Seeking PC Cards, AVL Modems, PDAs, and embedded modems Contract rider requested for CA, AZ, MD, and VA National Capital Region Interoperability Program

  8. Final Thoughts • 700 MHz vs. 4.9 GHz • 700 leverages LMR infrastructure • Is a national solution (not just urban) • Provides in-building coverage • COTS broadband standards should be leveraged to tap in to exponential improvements in spectral efficiency, features as well as cost effective for infrastructure based communications • How can MESA help? • 100% communications: • Develop cost-effective means to deliver the last 5% and a solution in the absence of infrastructure • Augment broadband coverage to match LMR link budget while maintaining low power solutions • PC Cards, PDAs, embedded modems • Push for global solutions that further drive cost model down (esp. for features that differentiate public safety and COTS)

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