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Wi-Fi Design

CRITICAL DESIGN ASPECTS

1. Primary Coverage Goal

OBJECTIVES

  • ▶ Provide Wi-Fi service in all required location
  • ▶ High-quality signal strength
  • ▶ Maintain high data rates

RESULTS

  • ▶ Improve airtime efficiency
  • ▶ Improve density handling

2. Secondary Coverage Goal

OBJECTIVES

  • ▶ Provide coverage for 2APs in each location

RESULTS

  • ▶ Improve client roaming
  • ▶ Low latency roaming for real-time application
  • ▶ Redundancy for AP failure

3. Capacity Plan

High Client Density

Low Client Density

CONSIDERATIONS

  • ▶ More spectrum in 5 GHz provides up to 8x the capacity of 2.4 GHz
  • ▶ Understand client mix
  • ▶ Client offered load/ SLA
  • ▶ Model airtime demand
  • ▶ Understand airtime saturation limits (80% BE, 50% BE/VO/VI, 35% VO)

RESULTS

  • ▶ Optimal number of APs
  • ▶ Proper client distribution between 5 GHz and 2.4 GHz
  • ▶ Leave idle airtime for growth

Client Device Efficiency

4. Minimize Interference

OBJECTIVES

  • ▶ Isolate APs on the same channel
  • ▶Reduce shared airtime
  • ▶ Limit contention domains
  • ▶ Eliminate external interference

RESULTS

  • ▶ Minimize co-channel interference (CCI) and adjacent channel interference (ACI) between APs on the same or overlapping channels
  • ▶ Ideally, only one AP audible on each channel in a physical location
  • ▶ Ideally, remove sources of external RF interference or avoid impacted channels if they cannot be removed

HIGH-PERFORMANCE WI-FI TIPS & TRICKS

1. Design for 5 GHz as Primary

  • ▶ The 5 GHz band provides 8 times the capacity of 2.4 GHz

2. Define Coverage Goal(s)

  • ▶ Too aggressive can lead to co-channel interference
  • ▶ Too conservative can lead to poor client performance

3. Place APs Where Users Are Located

  • ▶ In-room placement is best for client performance
  • ▶ Avoid hallways, if possible unless required for voice roaming

4. Tailor Coverage to the Facility

  • ▶ Leverage RF obstructions for frequency re-use
  • ▶ Consider proper antennas and orientation for signal propagation

5. Fine Tune AP Power Levels

  • ▶ Align with on-site signal measurements of RF propagation
  • ▶ Align with AP density and frequency re-use requirements

6. Disable 2.4 GHz Radios if Necessary

  • ▶ There are fewer available channels in 2.4 GHz
  • ▶ Disabling radios can prevent co-channel interference and shared capacity between clients
  • ▶ Some APs allow switching 2.4 GHz radio to 5 GHz

7. Design and Validate with Representative Client Devices

  • ▶ Spot-check with actual client devices to ensure the design matches actual client performance
  • ▶ Alternatively, measure with a standard RF site survey adapter and compensate the signal based on the actual client device characteristics

8. Higher AP Density Requires Smaller Channel Widths

  • ▶ Reduces co-channel interference and shared capacity between clients
  • ▶ Reduces client contention and improves network stability

9. Disable Low Data Rates to Improve Performance

  • ▶ 802.11b clients can significantly impact network performance
  • ▶ Reduces overhead from management frames and broadcast/multicast traffic

10. Minimized the Number of SSIDs

  • ▶ Network overhead increases with each SSID defined

RF DESIGN PROCESS

1. GATHER REQUIREMENTS

  • ▶ Blueprints/ CAD drawings
  • ▶ Coverage areas
  • ▶ Facility layouts & construction materials
  • ▶ Client number and mix
  • ▶ Client density distribution
  • ▶ Critical applications/ business process

1. GATHER REQUIREMENTS

  • ▶ Blueprints/ CAD drawings
  • ▶ Coverage areas
  • ▶ Facility layouts & construction materials
  • ▶ Client number and mix
  • ▶ Client density distribution
  • ▶ Critical applications/ business process

2. PRE-INSTALLATION DESIGN

  • ▶ Predictive modeling
  • ▶ Wall attenuation measurements
  • ▶ “AP on a stick” measurement
  • ▶ Wired network integration

2. PRE-INSTALLATION DESIGN

  • ▶ Predictive modeling
  • ▶ Wall attenuation measurements
  • ▶ “AP on a stick” measurement
  • ▶ Wired network integration

3. POST INSTALLATION VALIDATION

  • ▶ RF site survey (passive/ active/ spectrum)
  • ▶ RF tuning channel and power plans
  • ▶ Association and authentication tests
  • ▶ Roaming tests
  • ▶ Spectrum analysis

3. POST INSTALLATION VALIDATION

  • ▶ RF site survey (passive/ active/ spectrum)
  • ▶ RF tuning channel and power plans
  • ▶ Association and authentication tests
  • ▶ Roaming tests
  • ▶ Spectrum analysis

We, at MEC, can help you achieve that with the help of Ekahau Wireless Design products.

Talk to us for inquiries or for a FREE product consultation.

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