Mobility at CERN 6/6/2014 Mobility at CERN2 Co-author: IT/Communication Services CAPPS meeting
Agenda How does wireless work? Some good practices CERN mobile network CERN Wi-Fi network Future 6/6/2014 Mobility at CERN3
How does wireless work? 6/6/2014 Mobility at CERN4 RF signals travel in the air Liberty, Mobility but… There are rules and drawbacks
The drawback? 6/6/2014 Mobility at CERN5 Contrary to the wire, we cannot overpower the air… –RF propagation –Interference –Medium access and contention … Nor the end-user devices Spectrum is a limited resource we have to share Free bands are not so free –2.4GHz ISM band is crowded Licensed bands definitely not free
Signal reception and performance Received signal level NOT the single factor High performance requires Good signal quality Clean RF spectrum Low contention Stable wireless device SW Good wireless device HW 6/6/2014 Mobility at CERN6 Wireless devices might not perform equally in the same condition!!! Wireless infrastructure & environment Your wireless device
Ask for advice! Mobile Apps testing MUST move!!! 6/6/2014 Mobility at CERN7 Buffer the data Test the various hardware Think 3G/4G and Wi-Fi Secure the App Wireless encryption = Full security
The CERN Wireless infrastructure 6/6/2014 Mobility at CERN8
The CERN mobile network 6/6/2014 Mobility at CERN9 HSPA+: 3G++ or 3.75G Where? Underground facilities and Swiss territory What? Infra: 15Mbps DL & & 4 Mbps UL Single user: 7Mbps DL & 1 Mbps UL Shared resources and rate adaptation 900MHz compatible mobile device Live Video Streaming EDGE: 2.75G Where? French territory What? 384Kbps DL and 800ms latency Not for real time Apps
Sunrise Outdoor GSM radio coverage around CERN 6/6/2014 Mobility at CERN10
The CERN Wi-Fi network a/b/g/n 2.4GHz band up to 80Mbps half-duplex shared 5GHz band up to 240Mbps half-duplex shared Latency 4ms to 100ms Real time Apps? Yes, but not everywhere No L3 roaming yet Coverage map on GIS 6/6/2014 Mobility at CERN11 Coming soon Draft Improving
6/6/2014 Mobility at CERN12 In-building Wi-Fi coverage
Future 6/6/2014 Mobility at CERN13
LTE(4G) 6/6/2014 Mobility at CERN14 Pilot in LHCb and sector 1-8 this summer Up to 90Mbps DL & 14Mbps UL (theoretical) 3G/4G in surface in 2015 Even more LTE? Aggregation of two bands A second leaky feeder (2x2 MIMO) Speed X2 Test this summer Feasibility study
802.11ac 6/6/2014 Mobility at CERN15 5 GHz only New higher rate modulation Will be released in 2 “waves” Wave 1 (End 2014)Wave 2 (2016) Up to 80MHzUp to 160MHz Up to 3 spatial streamsUp to 4 spatial streams Single-User MIMOMulti-User MIMO Up to 650MbpsUp to 1732Mbps Speed X5
Potential advanced services Mobile campus Hotspot 2.0 6/6/2014 Mobility at CERN16 You are Here Real time location Real time video But where we go?