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DC Wireless PS Communications PowerPoint Presentation
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DC Wireless PS Communications

DC Wireless PS Communications

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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)