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Wi-Fi Planning - The 7 Secrets

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Wi-Fi Planning - The 7 Secrets

  1. 1. The 7 Secrets Wi-Fi Planning
  2. 2. Agenda 1. Who’s on the line? 2. Why are we here? 3. The 7 secrets of Wi-Fi Planning + hands-on demos
  3. 3. Jussi @JussiKiviniemi 11 years at Ekahau Mikko @ekaMikko 9 years at Ekahau
  4. 4. Ekahau <3 CWNP • CWNP = Wi-Fi knowledge = power • Ekahau = Wi-Fi tools
  5. 5. Ekahau <3 CWNP • Tools + power = superpowers? (or power tools?)
  6. 6. Ekahau <3 CWNP CWNP and Ekahau have been working together for 10 or so years. Various CWNP courses feature Ekahau products.
  7. 7. Ekahau Wi-Fi Tools Site Survey & Planning Mobile Survey Troubleshooting Spectrum Analyzer Fight interference
  8. 8. Ekahau Site Survey Pro w/ 3D Wi-Fi Planner
  9. 9. These guys and 500,000+ others use our stuff. “The simplest and most effective way to design, evaluate and document Wi-Fi.” - Blake Krone / Experienced wireless consultant “This tool rocks! For years, our field teams and our partners have been using Ekahau Wi-Fi Tools.” - William Aguilar / Extreme Networks “Absolutely the best live surveying tool around” - Bruce Alexander / Cisco Systems “First class products and continuous development and innovation” - Ian Morris / MLR Networks “Using <competing product> is like pulling your nails out.” - Justin Cetko, WLAN Consultant / Skyline Networks “Happy to say it’s the best survey/planning tool I’ve worked with.” - Tom Berry / Meru Networks “Great investment, exceptional software. Extremely accurate planning.” - Ben Cabrera / Stater Bros. Markets “Quickest to use, superior accuracy. Customer support has the friendliest bunch of folks. - Jim Florwick / Cisco Systems
  10. 10. If you only have 5 minutes today 1. Talk to people 2. Map is your friend 3. The world is not 2D 4. Coverage is easy… 5. … but channel overlap is harder… 6. … and capacity is … like … ultra-complex 7. Don’t always plan.
  11. 11. The Goal of Wi-Fi Planning Determine 1. the minimum number of APs and 2. optimal AP configurations to best satisfy the users’ requirements
  12. 12. Troubleshoot Validate PlanMonitor Requirements Simulation Site survey Spectrum analysisSpectrum analysis Continuous Packet analysis Periodic surveys Life Cycle of aWi-Fi Network
  13. 13. Methods Various ways to design Wi-Fi networks: 1. Best guess 2. Square feet/meter 3. Map-based ROM 4. Map based accurate Today, we’ll focus mostly on #4.
  14. 14. Rough Order of Magnitude (ROM) If you are very low on time, you could just cut some corners and take a best guess. Here’s how.
  15. 15. #1: Talk to people What exactly is required from the network?
  16. 16. Secret #1: Talk to people • Areas to cover and NOT to cover • Required coverage • Required capacity • Where APs can’t be placed • Budgetary constraints • Vendor constraints • Deliverables • Schedule
  17. 17. #2: This works for Indiana Jones. Not for you.
  18. 18. Secret #2: Use high quality maps • Sucky maps may be OK for site surveys… • … but not for planning
  19. 19. Secret #2: Use high quality maps + white background + 1:1 Proportions + meter/feet scale + overall easy to read
  20. 20. Secret #2: Use high quality maps
  21. 21. Secret #2: Use high quality maps
  22. 22. #3 is for 3D.
  23. 23. Secret #3: Everything is 3D. Signals travel through floors.
  24. 24. Secret #3: Everything is 3D. • APs work differently at different heights • High ceilings = directional antennas
  25. 25. Secret #3: Everything is 3D. • Shelves, racks are not all the way to ceiling • But they attenuate the signals. • So do cubicles.
  26. 26. Secret #3: Everything is 3D. • What about outdoor planning?
  27. 27. Secret #4: Coverage design • This is the easiest part of the puzzle… • … but only a small part of it
  28. 28. Secret #4: Coverage design • Pay attention to highly attenuating walls and areas • Consider also 2nd AP coverage (overlap) • Consider floor-to-floor bleed • Consider the 3D aspects
  29. 29. Secret #5: Overlap Just one Wi-Fi device can talk at a time.
  30. 30. Secret #5: Overlap Adding APs often makes capacity worse, not better.
  31. 31. 3 usable channels on 2.4GHz.
  32. 32. Where to put the next AP? Channel 1 Channel 6 Channel 11 Channel 1 Co-Channel interference: More than one AP audible per frequency
  33. 33. Adjacent channel interference Channel 1 Channel 2 Adjacent channel interference: APs on overlapping channels
  34. 34. Secret #6 – Capacity. There’s only so much load one AP can take. • ~ 200 associations per radio • ~50-300MBps throughput per radio • ~10 voice calls per radio
  35. 35. Secret #6 – Capacity. There’s only so much total airtime per channel. Again, adding APs may not help at all.
  36. 36. Using retro devices ain’t cool, man
  37. 37. Secret #6 – Capacity. There’s only so much total airtime per channel. Again, adding APs may not help at all.
  38. 38. “Capacity planning sucks, because it’s complex”
  39. 39. Capacity calculations 101 How many users? x How many devices per user? + How many other devices? --- = Devices and their types x Which applications are run on the devices? ==================== = Total capacity required
  40. 40. - Areas to cover - Types of end user devices - Types of access points - Channels/bands used - Single / multiple floors - Wall materials What else affects capacity?
  41. 41. Secret #7 – When NOT to plan? If it’s quicker / cheaper to do it on-site, perhaps better just go there?
  42. 42. Secret #7 – When NOT to plan? Challenging environments: • Mountains / hills • Stadiums • Oil refineries • Hugely complex manufacturing plants
  43. 43. Any questions? Now would be a good time to ask.
  44. 44. ekahau.com/wifidesign

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