1. 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 Borri
Direzione Ricerca e Sviluppo, CSP

2. dell’autorizzazione alla sperimentazione
Si ringrazia il MISE – Dip Com per la concessione
e la società Rete Capri per la disponibilità all’utilizzo
del canale 57 di cui sono titolari del diritto d’uso
nella Provincia di Torino.
WhiteFi @ 763 MHz

3. 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

4. 4
Valli di Lanzo / Val di Viù

5. 5
Val di Viù

6. System parameters
WhiteFi IEEE 802.11h
Operational
channel 5MHz @ 763MHz 20MHz @ 5GHz
Tx Power 18 dBm 22 dBm
AP
antennas
70° span
9 dBi gain
150° span
8 dBi gain
STA
antennas
Omnidir.
6 dBi gain
Omnidir.
5 dBi gain
6

7. 7
Lab test: throughput assessment
• Single UDP flow

8. 763MHz AP antenna
8

9. Antennas
9
5GHz
Antennas
763MHz Antennas

10. 5GHz coverage
10

11. 763MHz coverage
11

12. Throughput with a 2Mb/s UDP flow
from AP to station (downlink)
12

13. Throughput with a 2Mb/s UDP flow
from station to AP (uplink)
13

14. Throughput at 763MHz with a 6Mb/s UDP flow
14

15. 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
15

16. 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
16

17. 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 platform
i.e. Microsoft SORA
17

18. 18
Contatti
CSP innovazione nelle ICT
Sede
via Livorno 60 - 10144 Torino
Edificio Laboratori A1
Tel +39 011 4815111
Fax +39 011 4815001
E-mail: info@csp.it
Seconda sede operativa
Villa Gualino - Viale Settimio Severo 63
10133 Torino
www.csp.it
Roberto Borri
R&D Department
mail: roberto.borri@csp.it
tel: +39 0114815184