2. Mobility at CERN 6/6/2014 Mobility at CERN2 Sebastien.Ceuterickx@cern.ch Co-author: Rodrigo.Sierra.Moral@cern.chRodrigo.Sierra.Moral@cern.ch IT/Communication Services CAPPS meeting

3. Agenda How does wireless work? Some good practices CERN mobile network CERN Wi-Fi network Future 6/6/2014 Mobility at CERN3

4. How does wireless work? 6/6/2014 Mobility at CERN4 RF signals travel in the air Liberty, Mobility but… There are rules and drawbacks

5. 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

6. 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

7. 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

8. The CERN Wireless infrastructure 6/6/2014 Mobility at CERN8

9. 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

10. Sunrise Outdoor GSM radio coverage around CERN 6/6/2014 Mobility at CERN10

11. The CERN Wi-Fi network 802.11a/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 https://gis.cern.ch/gisportal/IT_Equipment.htm 6/6/2014 Mobility at CERN11 Coming soon Draft Improving

12. 6/6/2014 Mobility at CERN12 In-building Wi-Fi coverage

13. Future 6/6/2014 Mobility at CERN13

14. 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

15. 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

16. 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?