Wi-Fi Direct Channel Synchronization in DFS Band Handover
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Solution Overview
Problem
Existing wireless LAN communication apparatuses face challenges in efficiently setting frequency channels, particularly in DFS bands, due to restrictions on using the same channel as an STA when functioning as a GO in WFD R2, leading to inefficient channel changes and reduced communication efficiency.
Innovation Solution
A communication apparatus with multiple interfaces is designed to manage channel changes by coordinating channel settings between its STA and GO functions, ensuring efficient use of DFS bands by synchronizing channel changes across all interfaces based on received CSA elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a communication apparatus functions as a GO using a DFS band channel in WFD R2, then it can utilize the DFS band for communication, but it must use the same frequency channel as its STA function, which restricts channel selection flexibility
Solution Approach 1:
The patent merges the channel management of STA and GO functions by always using the same frequency channel for both. The control unit coordinates channel changes so that when the STA changes channels in response to radar detection, the GO function also transitions to the same channel, eliminating the need for separate channel management and reducing complexity
Solution Approach 2:
The control unit performs preliminary channel coordination by determining the GO's channel based on the STA's channel before communication occurs. This preliminary determination ensures that the GO is always configured to use the same channel as the STA, preventing channel conflicts and simplifying ongoing management
2Reliability
If the communication apparatus changes channels frequently to avoid radar signals, then DFS compliance is maintained, but communication efficiency decreases due to unnecessary channel changes
Solution Approach 1:
The system implements feedback-based channel management where the control unit monitors radar detection results and channel change outcomes. When a channel change is triggered by radar detection, the system evaluates whether the GO function also needs to change channels, and only performs changes when necessary, reducing unnecessary channel switches while maintaining DFS compliance
Solution Approach 2:
The patent applies dynamic channel management where the GO's channel configuration adapts based on the STA's operational state. The system dynamically determines whether to change the GO's channel based on real-time conditions such as radar detection and current channel usage, optimizing the balance between DFS compliance and communication efficiency
Data Source
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AI summary
A communication apparatus (102) that concurrently performs communication with an access point using a first communication interface as a station and communication with another apparatus functioning as a Client using a second communication interface as a Group Owner of a Wi-Fi Direct standard changes (S606, S607), in a case where a first wireless frame indicating a change of a frequency channel in use is received from the access point during a time when the first communication interface uses a frequency channel in a predetermined frequency band that needs support of a Dynamic Frequency Selection function and where the second communication interface uses a same frequency channel in the predetermined frequency band as that of the first communication interface, the frequency channel of the first communication interface and the second communication interface based on the first wireless frame.