2 stefano agosta cern it/communication systems high-speed mobile communications in hostile...
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High-Speed Mobile Communications in Hostile Environments
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Stefano Agosta
CERN IT/Communication Systems
High-Speed Mobile Communications in Hostile Environments
CHEP 2015 Okinawa
14/04/2015
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IntroductionIncreasing demand for indoor wireless networks
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Hostile Environments
• Offices
• Meeting points
• HomesHostile environments• CERN underground
• Trains
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CERN needs
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Target
• Gas release risk
• Strict access constraints
• Ionizing radiations
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CERN needs
Voice and data for :
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Services
• Standard machines operation
• Remote experts consultancy
• Train Inspection Monorail (Radio Protection surveys)
• Temperature and humidity sensors
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WiFi technology
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• 802.11ac wave 2 offers 3.5 Gbps
• Access Points (AP) cover small areas (few meters)
• Widely deployed in residential and office areas
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WiFi @CERN
• Adopted for offices
• Not suitable in the underground• Ionizing radiations • Tunnel lengths (27 Km for LHC, 7 Km for SPS)• Temporary VDSL during LongShutdown1
10 Mbps, 275 APs in LHC tunnel
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LTE technology
• 100% IP network• High spectral efficiency• MIMO (reliability and/or throughput enhancement)• Round Trip Time <10 ms• 1 Gbps download, 500 Mbps upload
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CERN tunnels mobile infrastructure
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• Target: tunnels + LHC caverns• Services: GSM, UMTS, TETRA, TETRAPOL• Antenna cable
resistant to radiations
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CERN tunnels mobile infrastructureInter-technology compatibility
Passive Radio Frequency network optimized for bands:
• 400 MHz• 800 MHz• 900 MHz
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Mobile operator base station
Master Unit
Remote Units
Mobile operator eNodeB
GSM + UMTSLTE
Remote Units
CERN tunnels mobile infrastructureLHC repeating system
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Measurements
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70 Mbps download, 15 Mbps upload
• LTE-Advanced @ LHC8>100 Mbps download, >50 Mbps upload
• LTE @ LHCb cavern
Limited by measurements tools
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Conclusions
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• Voice + data services needs in CERN underground
• WiFi: good performance, problematic feasibility• LTE: high throughputs in tunnels + caverns• RF infrastructure upgrade for inter-technology
compatibility
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Questions?
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Thank you!
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