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Broadband Wireless Communication System for Public Safety

Global Standards Collaboration (GSC) 14. Broadband Wireless Communication System for Public Safety. Homare Murakami, Masayuki Oodo, Hiroshi Harada NICT / ARIB.

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Broadband Wireless Communication System for Public Safety

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  1. Global Standards Collaboration (GSC) 14 Broadband Wireless Communication Systemfor Public Safety Homare Murakami, Masayuki Oodo, Hiroshi Harada NICT / ARIB

  2. In Japan, digitalization of terrestrial TV broadcasting service to be completedin July, 2011 == > reduce the total bandwidth for terrestrial TV broadcasting Background – frequency band– current analog TV broadcasting (total: 370MHz) 90 108 170 222 470 770 [MHz] current 1.mobile multimedia broadcasting after July, 2011 90 108 170 205 222 470 710 720 730 770[MHz] terrestrial digital TV broadcasting (240MHz) ==> 130 MHznewly available 4.cellular system 3.ITS 2. Broadband mobile communications for public safety

  3. Strategic Direction– current and expected systems for public safety– current system local government (prefectural/city/municipal) police agencies fire department -- narrow band voice low data rate transmission -- difficulty in interoperability narrow band narrow band difficulty in interoperability expected system -- shared by multiple public organizations -- broadband access service (several Mbps) for mobile users (main application: moving pictures transmission) -- highly-efficient spectrum use => OFDM-based system shared by multiple public organizations broadband

  4. Challengesfor reliability(1/2)– Radio Propagation Field Tests – RSSI measurement => coverage ~ 5 km P4 delay spread: => ~ 10usec fading performance: => slow temporal variation

  5. Challenges for reliability(2/2)– Transmission Experiments – In order to investigate adequate OFDM parameters, following combinations were tested. IEEE 802.22 Profile A GSM Typical Urban For long-delayed (~ 20μsec) channel environment, Mode2 (narrower subcarrier interval, resulted in good transmission performance. For short-delayed (~ 5μsec) channel environment, no large differences among all modes were seen.

  6. Next Steps/Actions • Toward the realization of broadband wireless communication system for public safety using the VHF bands (a portion of vacant lots after retirement of analog TV broadcasting service), • R & D of the system have been progressed. • Indoor and Field experiments have been conducted • to decide the system parameters (service coverage, PHY parameters etc.).

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