Dynamic Wi-Fi Ranging Bandwidth Adjustment for Precision and Interference
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Solution Overview
Problem
In enterprise WLAN deployments, the use of narrower bandwidth WLAN channels (e.g., 20 MHz or 40 MHz) for Wi-Fi ranging operations results in lower precision and increased interference, while switching to wider bandwidth channels for precise ranging can lead to air-time loss and connection issues.
Innovation Solution
Access Points (APs) temporarily and selectively increase the bandwidth of their home channels from narrower bandwidths (e.g., 20 MHz) to wider bandwidths (e.g., 80 MHz) to serve Wi-Fi ranging requests with improved precision, while performing regulatory-compliant traffic checks for the wider bandwidth before the change, and restoring the narrower bandwidth upon completion of the ranging operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If narrower bandwidth WLAN channels (20 MHz or 40 MHz) are used for Wi-Fi ranging operations, then interference is minimized and spectrum efficiency is enhanced, but ranging precision deteriorates
Solution Approach 1:
The patent dynamically adjusts the WLAN channel bandwidth based on the operation being performed. During Wi-Fi ranging operations, the bandwidth is temporarily increased to 80 MHz or 160 MHz to improve precision, while during normal data transmission, the bandwidth remains at narrower 20 MHz or 40 MHz to minimize interference. This dynamic adaptation resolves the contradiction by allowing the system to optimize for precision when needed and for interference reduction when not performing ranging.
Solution Approach 2:
The patent changes the bandwidth parameter of the WLAN channel from its default narrow value (20 MHz or 40 MHz) to a wider value (80 MHz or 160 MHz) specifically during Wi-Fi ranging operations. This parameter change enables higher ranging precision by providing more frequency resources for time-of-flight measurements, while the change is temporary and reversible, allowing the system to maintain narrow bandwidth benefits during normal operation.
2Measurement precision
If wider bandwidth WLAN channels (80 MHz or 160 MHz) are used for Wi-Fi ranging operations, then ranging precision is improved, but air-time loss and connection issues increase
Solution Approach 1:
The system dynamically switches bandwidth only during the brief period when Wi-Fi ranging operations are needed, rather than maintaining wide bandwidth continuously. This temporary dynamic adjustment provides the precision benefits of wide bandwidth only when required for ranging measurements, while minimizing air-time loss by quickly restoring narrow bandwidth for efficient data transmission during normal operation.
Solution Approach 2:
The patent implements periodic switching between narrow and wide bandwidth modes based on ranging operation requirements. The bandwidth is expanded to 80 MHz or 160 MHz periodically only when ranging is needed, and then restored to narrow bandwidth for normal data transmission. This periodic action pattern ensures that wide bandwidth is utilized efficiently for precision measurements without causing continuous air-time loss.
3Measurement precision
If bandwidth is increased from 20 MHz to 80 MHz for Wi-Fi ranging, then ranging precision is improved, but interference with neighbor AP performance increases
Solution Approach 1:
The patent implements dynamic bandwidth adjustment where the AP temporarily increases its channel bandwidth to 80 MHz or 160 MHz only during Wi-Fi ranging operations and then quickly restores it to 20 MHz or 40 MHz. This dynamic approach allows the AP to achieve high ranging precision when needed while minimizing the duration of wide bandwidth operation, thereby reducing interference with neighboring APs during normal data transmission periods.
Solution Approach 2:
The system changes the bandwidth parameter temporarily from 20 MHz to 80 MHz or 160 MHz specifically for Wi-Fi ranging operations. This parameter change is time-limited and reversible, allowing the AP to benefit from wider bandwidth for improved ranging precision while limiting the impact on neighbor AP performance to only the brief period when ranging is being performed.
Data Source
AI summary
Examples perform regulatory-compliant traffic checks for a wider bandwidth than a WLAN channel an AP is currently operating over before temporarily increasing the WLAN channel to the wider bandwidth to serve Wi-Fi ranging requests with improved precision. An example AP may: (1) while performing non-ranging Wi-Fi operations over a WLAN channel of a first bandwidth, perform a regulatory-compliant traffic check to determine whether a second bandwidth is clear of priority traffic, wherein the second bandwidth is wider than the first bandwidth; (2) responsive to receiving a Wi-Fi ranging request and determining the second bandwidth is clear of priority traffic, modify the WLAN channel from the first bandwidth to the second bandwidth to serve the Wi-Fi ranging request; and (3) upon completed service of the Wi-Fi ranging request, restore the WLAN channel to the first bandwidth for performing non-ranging Wi-Fi operations.