Wi-Fi Backhaul Channel Migration for Radar Interference
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Solution Overview
Problem
Current Wi-Fi backhaul networks face disruptions due to radar signal interference, as they lack efficient mechanisms for parent and child devices to quickly migrate to alternative channels upon frame loss or detection, leading to potential network disconnection.
Innovation Solution
A method where Wi-Fi devices detect disconnections and migrate to predefined backup channels upon radar signal detection, using separate radio modules for communication, ensuring continuous network operation by predefining migration paths and channels to avoid radar interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Wi-Fi backhaul networks use DFS channels (5.26-5.80 GHz) to achieve high data rates, then network speed is improved, but radar signal interference causes network disruption and disconnection
Solution Approach 1:
The patent pre-configures backup channels in the 2.4 GHz frequency band before radar interference occurs. When radar signals are detected on DFS channels, the system has already prepared alternative channels, enabling rapid migration without disruption. This preliminary preparation resolves the contradiction by ensuring high-speed operation on DFS channels while having pre-planned fallback options to maintain connectivity.
Solution Approach 2:
The patent introduces an intermediary mechanism (channel migration procedure) that mediates between the primary DFS channels and backup channels. When radar interference is detected, this intermediary mechanism orchestrates the transition from primary to backup channels, allowing the network to maintain high-speed operation when possible while ensuring reliability when interference occurs.
2Device complexity
If parent Wi-Fi devices wait for child devices to automatically detect radar signals and migrate channels, then device complexity is reduced, but network disruption time increases
Solution Approach 1:
The patent implements a feedback mechanism where child devices send acknowledgment frames to parent devices after migrating to backup channels. This feedback loop allows parent devices to detect when children have successfully migrated and coordinate the overall channel migration. The feedback mechanism reduces disruption time by enabling coordinated migration while maintaining manageable device complexity through standardized acknowledgment protocols.
Solution Approach 2:
The patent pre-establishes backup channels and migration procedures before radar interference occurs. When disruption is detected, the system can immediately execute pre-planned migration paths rather than reacting in real-time, significantly reducing disruption duration while keeping the migration management process simple through predefined protocols.
3Adaptability or versatility
If Wi-Fi devices use standard IEEE 802.11h DFS rules for radar detection, then regulatory compliance is improved, but frame loss occurs and child devices cannot reliably receive migration commands
Solution Approach 1:
The patent introduces acknowledgment frames as an intermediary mechanism to ensure reliable delivery of migration commands. When parent devices send CSA frames to children, the acknowledgment frames serve as a feedback intermediary that confirms receipt and understanding. This intermediary layer compensates for frame loss issues while maintaining compliance with IEEE 802.11h DFS rules.
Solution Approach 2:
The patent implements redundant backup channels and acknowledgment mechanisms before frame loss can occur. By having pre-configured backup channels and confirmation protocols in place, the system is cushioned against the effects of frame loss, ensuring that migration commands are reliably delivered even when standard DFS operations cause interference.
Data Source
AI summary
A method for managing a communication channel used by a plurality of Wi-Fi devices of a Wi-Fi network of the backhaul type for implementing a backhaul network in said Wi-Fi network. A first Wi-Fi device in the plurality performs the method and comprises: detecting a disconnection from an initial channel used by the plurality of Wi-Fi devices for implementing the backhaul network of a second Wi-Fi device in the plurality connected directly to the first Wi-Fi device; listening on a backup channel, to which the second Wi-Fi device is able to migrate to implement the backhaul network in the event of detection, by the second Wi-Fi device, of a radar signal on the initial channel; causing the first Wi-Fi device to migrate to the backup channel in the event of reception on the backup channel by the first Wi-Fi device of a frame containing an identifier of the second device.