Access Point Frequency Hopping for Timely DFS Data Transmission
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Solution Overview
Problem
Wireless communication systems face challenges in maintaining timely data transmission due to the Dynamic Frequency Selection (DFS) regulations, which require radar signal detection during Channel Availability Check (CAC) periods, leading to delays and susceptibility to environmental interference.
Innovation Solution
An access point device and terminal device implement a frequency hopping method that monitors and selects channels based on transmission quality assessment metrics and radar signals, allowing for immediate channel switching without CAC periods by using an idle channel for interference detection, ensuring timely data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless device switches to a DFS channel, then the channel selection flexibility is improved, but the transmission timeliness deteriorates due to CAC period delays
Solution Approach 1:
The access point performs radar signal detection and CAC period verification on DFS channels in advance, before actual data transmission begins. This preliminary action ensures that when a DFS channel is selected for transmission, the CAC requirements have already been satisfied, eliminating transmission delays while maintaining channel selection flexibility
2Reliability
If a wireless device performs radar signal detection on DFS channels, then the radar interference avoidance is improved, but the communication timeliness deteriorates
Solution Approach 1:
The patent replaces the traditional sequential radar detection mechanism with a parallel monitoring approach. The access point continuously monitors radar signals on DFS channels alongside normal data transmission operations, substituting the time-consuming sequential CAC process with concurrent monitoring that does not interrupt communication timeliness while maintaining radar interference avoidance
3Reliability
If a wireless device randomly hops to another DFS channel when radar signal is detected, then the radar interference avoidance is improved, but the transmission timeliness deteriorates further
Solution Approach 1:
The access point implements continuous feedback monitoring of radar signals on active DFS channels. When radar signals are detected during transmission, the system receives feedback about the interference condition and dynamically adjusts by switching to alternative pre-verified channels, maintaining radar avoidance while minimizing transmission delays through informed real-time decisions
Data Source
AI summary
An access point device communicating with a terminal device by using wireless transmission channels is provided. The access point device includes a first data transmission module and a first channel detection module; the first data transmission module transmits service data and hops to an alternative channel in response to existence of interference on a first channel; in response to no interference on a second channel, the alternative channel is the second channel; the first channel detection module monitors a signal on the second channel to determine whether interference exists on the second channel; in response to the second channel being a DFS channel, the monitored signals comprise an interfering signal and a radar signal; and after the second channel is used as a new first channel, a target channel is selected as a new second channel to be monitored.