WLAN Modem Zero-Wait DFS Using Multiple RF Transceivers
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Solution Overview
Problem
Dynamic Frequency Selection (DFS) protocols require WLAN modems to stop transmitting/receiving data traffic for a minimum listening time to detect radar signals, leading to inefficiencies in channel usage, especially when switching between channels allocated to radar devices.
Innovation Solution
A WLAN modem apparatus and method that performs DFS scanning without interrupting ongoing data communications by utilizing multiple RF transceivers, allowing continuous data transmission/reception on other channels while scanning for radar signals on the intended DFS channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DFS scanning is performed on a channel, then radar signal detection is enabled, but data transmission is interrupted for minimum listening time
Solution Approach 1:
The patent divides the RF transceiver functionality into separate scanning transceivers and data communication transceivers. The scanning transceivers are dedicated to DFS radar detection, while the data transceivers continue handling WLAN data communications. This segmentation allows radar scanning and data transmission to occur simultaneously without interruption, resolving the contradiction between reliable radar detection and continuous data productivity.
Solution Approach 2:
The patent implements a multi-functional RF transceiver system where multiple transceivers can operate simultaneously - some dedicated to DFS scanning and others to data communication. This universality allows the system to perform both radar detection and data transmission functions concurrently, eliminating the need to choose between the two mutually exclusive operations.
2Measurement precision
If minimum listening time is enforced for DFS, then radar detection accuracy is improved, but channel utilization efficiency decreases
Solution Approach 1:
The patent performs DFS scanning in advance before data transmission begins on a channel. By completing the radar detection process beforehand, the system ensures radar safety requirements are met while allowing immediate data transmission to start without waiting for the minimum listening period to expire during active communication. This preliminary scanning action maintains detection accuracy while improving channel utilization.
Solution Approach 2:
The patent introduces dedicated scanning transceivers as intermediary components that handle DFS scanning separately from the main data communication transceivers. These intermediary scanning transceivers perform radar detection without blocking the data transceivers, allowing both high-accuracy radar detection and efficient channel utilization to coexist by mediating between the two functions.
3Device complexity
If single RF transceiver is used for both scanning and data transmission, then device complexity is reduced, but transmission interruption occurs during scanning
Solution Approach 1:
The patent segments the RF transceiver resources into separate scanning transceivers and data transceivers. This segmentation, while increasing hardware complexity, eliminates transmission downtime by allowing parallel operations. The trade-off is justified by the elimination of productivity loss, as the additional transceiver hardware enables continuous data transmission during scanning operations.
Data Source
AI summary
The present disclosure is directed to systems, apparatuses, and methods for operating a wireless local area network (WLAN) modem to perform WLAN channel change in a WLAN environment that is inhabited by radar devices, and therefore subject to a Dynamic Frequency Selection (DFS) requirement defined by the appropriate WLAN governing standards. Specifically, the present disclosure is directed to an apparatus and method for reducing or eliminating the amount of time in which a WLAN transceiver cannot transmit/receive data traffic while listening for radar signals on a channel allocated to radar devices for the minimum listening time specified by DFS.