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Mobility at CERN

HEPiX Fall 2013. Mobility at CERN. Sebastien.Ceuterickx@cern.ch IT/Communication Systems. Agenda. Evolution of Wi-Fi at CERN BYOD impact Special Wi-Fi deployments Eduroam@CERN. Development of the CERN Wi-Fi. Early 2007. x 6 Devices in 6 years. 7,000 unique devices per day.

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Mobility at CERN

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  1. HEPiX Fall 2013 Mobility at CERN Sebastien.Ceuterickx@cern.ch IT/Communication Systems HEPiX Fall 2013

  2. Agenda • Evolution of Wi-Fi at CERN • BYOD impact • Special Wi-Fi deployments • Eduroam@CERN HEPiX Fall 2013

  3. Development of the CERN Wi-Fi Early 2007 x 6 Devices in 6 years 7,000 unique devices per day 4,000 simultaneous users 7 Gbps of traffic 1,400 Access points 280,000m2 covered HEPiX Fall 2013

  4. Wi-Fi is complex The challenges: - client related issues • - infrastructure issues: • deployment challenges • sources of interference - (high) density issues - expected QoS from the user’s point of view - a combination of all factors HEPiX Fall 2013

  5. Challenges: client issues HEPiX Fall 2013

  6. Challenges: a diverse infrastructure HEPiX Fall 2013

  7. Challenges: A large and dynamic environment • 600,000m2 indoor area (+20% in 6 years) • 650 surface buildings (+15% in 6 years) • 2,100,000m2 outside area (stable) • New experiments • Building refurbishment HEPiX Fall 2013

  8. Challenges: intensive usage • From an extension of the structured cabling to fundamental service The primary connection for an increasing number of devices HEPiX Fall 2013

  9. How do we address this? HEPiX Fall 2013

  10. Optimizing RF spectrum! • Migration from 802.11bg to 802.11n 5GHz • Up to 240Mbps half-duplex shared • From 200m2 per AP to 120m2 (-40% ) • Increase the density of APs Avoid the 2.4GHz Band where possible HEPiX Fall 2013

  11. Turning ON is not enough • Band steering • Load balancing • Auto-channel assignment • Auto-power tuning Mightnot work out of the box RF planning and site survey still required Wi-Fi tuning necessary HEPiX Fall 2013

  12. Automation for scalability Integrated within global NMS Simplify Increase reliability Save resources Data Base Network Management System Automated RF configuration HEPiX Fall 2013

  13. Control, act and support Efficient monitoring and analysis system deployed Remote operation Proactive optimization Efficient end-user support HEPiX Fall 2013

  14. BYOD: The impact 802.11n compliant BUT… 1 spatial stream (75Mbps max) Reduced Wi-Fi performance Ban (very) poor connectivity Optimize RF planning Increase AP density Ban them ?? HEPiX Fall 2013

  15. Special deployments HEPiX Fall 2013

  16. Conference rooms Capacity is the key concern. • Efficient RF planning for • Minimizing interference • Optimizing load sharing • Reduce Tx Power • Ban slow stations & low data rates • Enable band steering and airtime fairness • Use external antennas HEPiX Fall 2013

  17. Underground caverns Coverage is the key concern. • Efficient RF planning for • Minimizing co-channel interference • Maximizing coverage • Disable band steering • Enable RTS/CTS • Use external antennas and power dividers • Use a leaky feeder HEPiX Fall 2013

  18. eduroam@CERN HEPiX Fall 2013

  19. Travelling?Take Internet access with you! • A secure international roaming service • Based on a federation of RADIUS servers Home Institute HEPiX Fall 2013

  20. How do we deploy it? • freeRADIUS • certificate based for CERN user (EAP-TLS ) • No additional hardware • Fully automated • Pilot version running • end 2013 : 80% of the infrastructure HEPiX Fall 2013

  21. Conclusion • WLAN at CERN will continue to grow. • Wi-Fi has became a (highly) popular and fundamental service which requires a significant investment to work properly in a professional environment. • 802.11ac will bring new opportunities --- and new challenges. HEPiX Fall 2013

  22. Thank you! Question HEPiX Fall 2013

  23. Future HEPiX Fall 2013

  24. 802.11ac • 5 GHz only • New higher rate modulation • Will be release in 2 “waves” HEPiX Fall 2013

  25. New opportunities… …new challenges • Higher throughput • Better performance at the same range • Impact on infrastructure ? • Impact on RF planning ? • Higher rate only at short range • (-55dBm = same room) HEPiX Fall 2013

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