Access Point Channel Availability Check Beaconing
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Solution Overview
Problem
Current wireless communication systems face challenges during channel availability checks, as they must refrain from transmitting beacons on dynamic frequency selection (DFS) channels to avoid interfering with radar signals, leading to service interruptions and poor user experience.
Innovation Solution
The proposed solution involves an access point (AP) that updates a bitmap to indicate available and unavailable channels, allowing it to transmit beacons on non-DFS channels during channel availability checks, thereby maintaining connectivity and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access point performs channel availability check on DFS channels to ensure radar compatibility, then channel reliability is improved, but service continuity deteriorates due to beacon transmission interruptions
Solution Approach 1:
The access point segments the channel set into DFS channels and non-DFS channels, performing channel availability checks only on DFS channels while maintaining beacon transmissions on non-DFS channels. This segmentation allows the system to ensure radar compatibility on DFS channels without interrupting service continuity overall.
Solution Approach 2:
The access point uses non-DFS channels as intermediary carriers for beacon transmissions during the channel availability check period. These intermediary channels bridge the gap between the need to check DFS channels for radar and the need to maintain continuous service, allowing beacons to be transmitted without interfering with the CAC procedure.
2Duration of action of stationary object
If the access point transmits beacons continuously on all channels to maintain service continuity, then service continuity is improved, but harmful interference to radar signals increases
Solution Approach 1:
The access point segments channel transmission rights by allowing beacons only on non-DFS channels during CAC, while suspending beacon transmissions on DFS channels. This segmentation prevents harmful interference to radar signals on DFS channels while maintaining service continuity through non-DFS channel transmissions.
Solution Approach 2:
The access point performs preliminary channel availability checks on DFS channels before transmitting beacons on those channels. This preliminary action ensures that beacon transmissions do not occur on channels occupied by radar signals, thereby preventing harmful interference while maintaining service continuity on available channels.
3Object-affected harmful factors
If the access point waits until after channel availability check to transmit beacons, then radar interference is avoided, but communication latency increases
Solution Approach 1:
The access point segments the beacon transmission function across different channel types, transmitting beacons on non-DFS channels during the CAC period while withholding beacon transmissions on DFS channels until after CAC completes. This segmentation reduces communication latency on non-DFS channels while ensuring radar interference avoidance on DFS channels.
Solution Approach 2:
The access point maintains continuous beacon transmissions on non-DFS channels during the channel availability check period, ensuring that the useful action of service communication continues without interruption. This continuous transmission on available channels reduces communication latency while avoiding radar interference on DFS channels where CAC is performed.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An access point (AP) may update a bitmap (e.g., an extremely high throughput (EHT) operations (Ops) information element (IE) disabled subchannel bitmap) that indicates which channels of a band are available and unavailable. In some examples, the AP may update the bitmap during a channel availability check (CAC) based on whether various channels are DFS channels or non-DFS channels. During the CAC, the AP may transmit beacons to one or more stations (STAs) on the available non-DFS channels (e.g., instead of waiting until after the CAC to perform any beaconing).