I have received a lot of emails expressing interest in Wi-Fi site surveys. Everything from outdoor point to point, factories, and of course, office environments.
This video provides a practical overview of conducting wireless site surveys, focusing on straightforward, adaptable methods rather than rigid rules. The presenter highlights essential planning steps, tool selection, measurement techniques, and data interpretation to ensure reliable Wi-Fi performance assessment both indoors and outdoors.
1. Planning and Preparation for Wireless Site Surveys
Effective site surveys begin with thorough planning, regardless of an indoor or outdoor environment. Early preparation improves data accuracy and saves time during analysis.
- Write down key parameters such as frequency bands (e.g., 2.4 GHz, 5 GHz) before starting to avoid confusion later.
- Maintain a clear plan specifying testing locations and order to avoid getting lost or forgetting where measurements were taken.
- Use labels or notes (e.g., “test 1 inside lobby”) to organize data points effectively.
- Understand that initial walks do not need centimeter-level precision; rough approximations (counting floor tiles, eyeballing distance) are sufficient.
- Plan to perform more focused, detailed surveys on specific areas only if initial results indicate concern.
2. Recommended Survey Tools and Features
Tool selection depends on convenience, data accuracy, and ease of result handling.
- I used the NetAlly AirCheck G2, because ut had features such as:
- Automatic emailing of survey results.
- Uploading and storing data on the Link Live portal for organized analysis.
- Adjustable heat map visualization with customizable signal range.
- Supplementary tools include smartphones and laptops using apps like Homedale or **Wi-Fi Analyzer**.
- The priority is **tool consistency** rather than absolute accuracy since different tools may yield varying RSSI values.
- Always record which tool was used for each measurement for future reference and comparison.
3. Measurement Parameters and Interpretation
Data collection focuses on parameters critical to understanding wireless coverage and performance.
- Basic parameters to record:
- Frequency band (2.4 GHz / 5 GHz / 6 GHz).
- Received Signal Strength Indicator (RSSI)
- Noise floor
- Signal-to-noise ratio (SNR)
- Observing signal stability is crucial; values should vary within a small range (e.g., RSSI between -52 and -60 dBm).
- Large fluctuations (e.g., ranging from -30 to -80 dBm in the same spot) suggest interference or other issues.
- Heat maps provide intuitive visualizations but the presenter recommends focusing on actual numerical data rather than colors, especially during initial surveys.
- - Site surveys fall into two categories: passive (listening to existing signals) and active (transmitting test signals). This video focuses on passive surveying.
4. Importance of Throughput and Real-World Application Testing
While RF statistics provide foundational data, actual throughput measurements reveal network usability.
- Measure throughput using tools like **iperf**, in both TCP (for throughput) and UDP (for jitter and packet loss) modes.
- The example compares performance of the NetAlly AirCheck G2 tool and a Samsung Galaxy S7 at various distances.
- Data shows throughput degrades significantly at longer distances from the access point (e.g., drop observed at approximately 70 feet).
- Testing must be done with real client devices and real applications to avoid misleading assumptions based purely on RF or throughput numbers.
- Different use cases dictate which performance metrics to prioritize:
- Streaming/live video requires low jitter and packet loss.
- Bulk file transfers are more throughput-sensitive.
- Network conditions such as access point load and number of active clients affect results and should be noted, even if roughly.
5. Best Practices and Final Recommendations
In this section, I offer guidance to ensure efficient and meaningful wireless site surveys.
- Consistent documentation is key: record tools, locations, environmental conditions, and device loads.
- Avoid obsessing over exhaustive detail on first passes; focus on main trends and problem areas.
- Regularly familiarize yourself with your tools’ quirks and reporting features to enhance accuracy and troubleshooting speed.
- Validate survey results against real-world usage scenarios before making network configuration decisions.
- Recognize that this approach is one of many; each technician or team will adapt techniques based on their environment and needs.
6. Quantitative Comparison of Throughput (Example Summary)
- The AirCheck G2 consistently provided higher throughput values than the smartphone in the example.
- Differences between upload and download results can vary due to numerous factors including environmental interference and device capabilities.
Key Insights
- Planning and labeling are essential for clarity and ease during complex surveys.
- Consistency in tools and methods is more important than absolute precision at initial stages.
- Throughput and real application testing must complement RF measurements to determine network usability.
- Note environmental factors such as device load on access points to contextualize performance data.
- Passive surveys help assess signal coverage broadly, while active surveys are better for detailed troubleshooting.
- Different tools have varying performance and measurement results; familiarity enhances troubleshooting efficiency.
This approach enables effective and repeatable wireless site surveys without overwhelming complexity, making it suitable for many practical network environments.
