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La sfida per l’accesso dinamico e flessibile allo spettro: radio cognitiva, spazi bianchi e nuovo quadro regolatorio
CSP WhiteFi project
Seminari FUB – Bologna 4 luglio 2011
Roberto BorriDirezione Ricerca e Sviluppo, CSP
dell’autorizzazione alla sperimentazione
Si ringrazia il MISE – Dip Com per la concessione
e la società Rete Capri per la disponibilità all’utilizzodel canale 57 di cui sono titolari del diritto d’usonella Provincia di Torino.
WhiteFi @ 763 MHz
Digital divide:Non solo hotspot, bensì “Wide area coverage”@ wifi-like performance
Internet delle cose (IoT):Dal “skeduled data gathering“ al“Near-always on sensor access”
Due grandi necessità ancora irrisolte
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Valli di Lanzo / Val di Viù
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Val di Viù
System parameters
WhiteFi IEEE 802.11hOperational
channel 5MHz @ 763MHz 20MHz @ 5GHz
Tx Power 18 dBm 22 dBmAP
antennas 70° span
9 dBi gain150° span8 dBi gain
STA antennas
Omnidir.6 dBi gain
Omnidir.5 dBi gain
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Lab test: throughput assessment
• Single UDP flow
763MHz AP antenna
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Antennas
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5GHz Antennas
763MHz Antennas
5GHz coverage
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763MHz coverage
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Throughput with a 2Mb/s UDP flow from AP to station (downlink)
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Throughput with a 2Mb/s UDP flow from station to AP (uplink)
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Throughput at 763MHz with a 6Mb/s UDP flow
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CSP roadmap for SDR WhiteSpace system
• Objective:
– development of a cognitive network of software-defined wireless nodes operating in the TV white spaces
• Main characteristics
– DVB-T specific sensing (cyclic prefix correlation)
– High spectral efficiency
• Full bandwidth exploitation
• Adaptive coding and modulation schemes
– Relaying
• Inter-frequency
• Multi-hop
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CSP roadmap for SDR WhiteSpace system
• 2011-Q2
– Study and definition of the whole system (PHY layer, MAC layer, Sensing, network structure)
– Development of the spectrum sensing module
– Development of the transceiver module
• 2011-Q3
– Lab testing of the sensing module
– Development of the transceiver module
• 2011-Q4
– Lab testing of the transceiver module
– Integration of the whole system, lab and field testing
• 2012: improvements
• higher spectral efficiency
• better radio resource management
• relaying
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CSP roadmap for SDR WhiteSpace system
• SDR prototype architecture
– AP and STA nodes
• General-purpose workstations (Linux-based)
• Ettus USRP2 radio front-ends
• Critical aspects
– High latency of the USRP ↔ workstation connection
– Limited overall bandwidth
– Planned improvement: bus-based platformi.e. Microsoft SORA
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Contatti
CSP innovazione nelle ICT
Sede via Livorno 60 - 10144 TorinoEdificio Laboratori A1Tel +39 011 4815111Fax +39 011 4815001E-mail: [email protected]
Seconda sede operativaVilla Gualino - Viale Settimio Severo 6310133 Torino
www.csp.it
Roberto BorriR&D Department
mail: [email protected]: +39 0114815184