Wi-Fi Field-to-Lab Testing via Programmable Attenuators
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Solution Overview
Problem
Current wireless testing methods face challenges in replicating real-world scenarios in a controlled lab setting, particularly for complex Wi-Fi mesh networks due to variability in home environments and configurations, leading to time-consuming, costly, and unreliable testing.
Innovation Solution
A method and system for field-to-lab testing that involves retrieving data on wireless path-loss measurements and physical configurations of a Wi-Fi mesh network, using programmable attenuators to simulate the field environment in a lab setting, allowing for accurate reproduction of signal strengths and movements within the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If real-world field testing is performed to capture actual wireless propagation scenarios, then measurement accuracy and reliability are improved, but testing time and cost increase significantly
Solution Approach 1:
The system performs preliminary field measurements to capture propagation characteristics, then uses these measurements to configure a lab environment that replicates the field conditions. This preliminary action allows subsequent testing to be done in the controlled lab setting rather than requiring repeated field tests.
Solution Approach 2:
The system creates a copy of the field wireless environment in the lab by using programmable attenuators to replicate path-loss measurements and physical configurations. This copying allows accurate propagation simulation without returning to the original field location for additional testing.
2Adaptability or versatility
If complex Wi-Fi mesh network configurations are tested in diverse home environments, then scenario coverage and reliability are improved, but device complexity and testing coordination increase
Solution Approach 1:
The system introduces a computer-controlled intermediary that manages the lab environment configuration. This intermediary automatically adjusts programmable attenuators and coordinates device connections based on stored field measurement data, simplifying the management of complex mesh network scenarios.
Solution Approach 2:
The system changes physical parameters in the lab environment (signal attenuation levels, device connections) to match field conditions. By adjusting these parameters based on stored measurements, the system can replicate multiple different home environments and mesh configurations without physically moving devices.
3Reliability
If multiple field locations and configurations are tested to ensure comprehensive coverage, then testing completeness is improved, but cost and resource requirements increase
Solution Approach 1:
The system performs comprehensive field measurements once to capture propagation characteristics from multiple locations and configurations. These measurements are stored and used to configure the lab environment, eliminating the need for repeated resource-intensive field trips while maintaining testing completeness.
Solution Approach 2:
The system creates copies of multiple field environments in the lab using programmable attenuators configured with stored path-loss data. This allows comprehensive testing of various scenarios without the ongoing resource costs of field testing.
Data Source
AI summary
Path-loss measurements are determined for a test client device moving along a path in a field test environment in which field Wi-Fi mesh network nodes are distributed. The path-loss measurements are reproduced in a field-to-lab test environment that includes a test client device disposed in an electromagnetically-isolated chamber and field test Wi-Fi mesh network nodes disposed in respective electromagnetically-isolated chambers. The test client device and the field test Wi-Fi mesh network nodes are in wired or wireless communication with each other via signal lines. A programmable attenuator is electrically coupled to each signal line. The attenuation of each programmable attenuator is varied to reproduce the path-loss measurements from the field test environment. Path-loss measurements at the location of each field Wi-Fi mesh network node are also reproduced with the programmable attenuators to reproduce the field Wi-Fi mesh network node configuration.