Wi-Fi Planning - The 7 Secrets
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The 7 Secrets
Wi-Fi Planning
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Agenda
1. Who’s on the line?
2. Why are we here?
3. The 7 secrets of Wi-Fi Planning
+ hands-on demos
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Jussi@JussiKiviniemi
11 years at Ekahau
Mikko@ekaMikko
9 years at Ekahau
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Ekahau <3 CWNP
• CWNP = Wi-Fi knowledge = power
• Ekahau = Wi-Fi tools
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Ekahau <3 CWNP
• Tools + power = superpowers?
(or power tools?)
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Ekahau <3 CWNP
CWNP and Ekahau have been
working together for 10 or so
years.
Various CWNP courses feature
Ekahau products.
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Ekahau Wi-Fi Tools
Site Survey & Planning
Mobile SurveyTroubleshooting
Spectrum AnalyzerFight interference
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Ekahau Site Survey Prow/ 3D Wi-Fi Planner
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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
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If you only have 5 minutes today
1. Talk to people2. Map is your friend3. The world is not 2D4. Coverage is easy…5. … but channel overlap is harder…6. … and capacity is … like … ultra-complex7. Don’t always plan.
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The Goal of Wi-Fi Planning
Determine
1. the minimum number of APs and
2. optimal AP configurations
to best satisfy the users’ requirements
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Troubleshoot Validate
PlanMonitor
Requirements
Simulation
Site survey
Spectrum analysis
Spectrum analysis
Continuous
Packet analysis
Periodic surveys
Life Cycle of a Wi-Fi Network
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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.
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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.
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#1: Talk to people
What exactly is required from the network?
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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
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#2: This works for Indiana Jones. Not for you.
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Secret #2: Use high quality maps
• Sucky maps may be OK for site surveys…• … but not for planning
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Secret #2: Use high quality maps
+ white background + 1:1 Proportions + meter/feet scale + overall easy to read
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Secret #2: Use high quality maps
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Secret #2: Use high quality maps
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#3 is for 3D.
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Secret #3: Everything is 3D.
Signals travel through floors.
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Secret #3: Everything is 3D.
• APs work differently at different heights• High ceilings = directional antennas
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Secret #3: Everything is 3D.
• Shelves, racks are not all the way to ceiling• But they attenuate the signals.• So do cubicles.
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Secret #3: Everything is 3D.
• What about outdoor planning?
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Secret #4: Coverage design
• This is the easiest part of the puzzle…• … but only a small part of it
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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
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Secret #5: Overlap
Just one Wi-Fi device can talk at a time.
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Secret #5: Overlap
Adding APs often makes capacity worse, not better.
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3 usable channels on 2.4GHz.
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Where to put the next AP?
Channel 1
Channel 6
Channel 11
Channel 1
Co-Channel interference:More than one AP audible per frequency
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Adjacent channel interference
Channel 1
Channel 2
Adjacent channel interference:APs on overlapping channels
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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
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Secret #6 – Capacity.
There’s only so much total airtime per channel.
Again, adding APs may not help at all.
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Using retro devices ain’t cool, man
Not go
od
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Secret #6 – Capacity.
There’s only so much total airtime per channel.
Again, adding APs may not help at all.
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“Capacity planning sucks,because it’s complex”
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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
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- Areas to cover - Types of end user devices - Types of access points - Channels/bands used - Single / multiple floors - Wall materials
What else affects capacity?
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Secret #7 – When NOT to plan?
If it’s quicker / cheaper to do it on-site,perhaps better just go there?
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Secret #7 – When NOT to plan?
Challenging environments:• Mountains / hills• Stadiums• Oil refineries• Hugely complex manufacturing plants
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Any questions?Now would be a good time to ask.
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