Adaptive Channel Access for 5 GHz WiFi Interference
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Solution Overview
Problem
The increasing use of the 5 GHz spectrum for both cellular and WiFi communications leads to interference issues due to independent coordination, necessitating effective coexistence mechanisms to manage channel occupancy times, which can impact WiFi throughput and efficiency.
Innovation Solution
Devices implement adaptive channel access by scanning for energy during media/channel access, adjusting channel occupancy time based on detection of concurrent cellular communications, reducing unnecessary access procedures when no interference is detected and adhering to reduced occupancy times when interference is present, thereby mitigating interference and maintaining throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If devices perform frequent media/channel access procedures to ensure compliant operation in shared spectrum, then interference mitigation is improved, but WiFi throughput decreases due to wasted access procedures
Solution Approach 1:
The system dynamically adjusts channel occupancy time based on real-time detection of concurrent communications. When cellular communications are detected, the WiFi device reduces its channel occupancy time to prevent interference. When no cellular communications are present, the WiFi device can occupy the channel for the full allotted time, maximizing throughput. This dynamic adaptation resolves the contradiction by making the channel access strategy flexible rather than static.
Solution Approach 2:
The system implements a feedback mechanism where the WiFi device continuously monitors the channel for signs of concurrent cellular communications and adjusts its channel access behavior accordingly. The detection of cellular signals provides feedback that triggers a reduction in WiFi channel occupancy time, while the absence of such signals allows for extended occupancy. This feedback loop enables the system to automatically optimize the balance between interference mitigation and throughput maintenance.
2Object-affected harmful factors
If devices reduce channel occupancy time to accommodate concurrent cellular communications, then interference is reduced, but WiFi efficiency decreases due to more frequent access procedures
Solution Approach 1:
The system dynamically adjusts channel occupancy time based on real-time detection of concurrent communications. When cellular communications are detected, the WiFi device reduces its channel occupancy time to prevent interference. When no cellular communications are present, the WiFi device can occupy the channel for the full allotted time, maximizing throughput. This dynamic adaptation resolves the contradiction by making the channel access strategy flexible rather than static.
Solution Approach 2:
The system changes the channel occupancy time parameter based on detected conditions. The occupancy time is extended beyond the standard duration when no cellular communications are detected, allowing WiFi to maintain higher efficiency. When cellular communications are present, the occupancy time is reduced to the standard or shorter duration to mitigate interference. This parameter adjustment strategy directly addresses the contradiction by optimizing the occupancy time variable according to real-time spectral conditions.
3Productivity
If devices perform full channel occupancy without detection, then WiFi throughput is maximized, but interference with cellular communications increases
Solution Approach 1:
The system performs preliminary detection of cellular communications before initiating full channel occupancy. By scanning for cellular signals in advance, the WiFi device can determine whether it is safe to occupy the channel for the full allotted time. This preliminary action prevents interference by avoiding full occupancy when cellular communications are present, while still allowing maximum throughput when the channel is clear.
Solution Approach 2:
The system implements a feedback mechanism where the WiFi device continuously monitors the channel for signs of concurrent cellular communications and adjusts its channel access behavior accordingly. The detection of cellular signals provides feedback that triggers a reduction in WiFi channel occupancy time, while the absence of such signals allows for extended occupancy. This feedback loop enables the system to automatically optimize the balance between interference mitigation and throughput maintenance.
Data Source
AI summary
A device in an adaptive channel access system may include a processor that is configured initiate access of a channel, and perform a first jammer detection on the channel. The processor is configured to, when a jamming device is detected on the channel, access the channel with a channel occupancy time set to a first duration of time. The processor is configured to, when no jamming devices are detected: access the channel with the channel occupancy time set to the second duration of time that is greater than the first duration, while accessing the channel with the channel occupancy time set to the second duration of time, perform a second jammer detection on the channel, and when the jamming device is detected, cease to access the channel prior to the expiration of the second duration of time, otherwise continue to access the channel without re-initiating access of the channel.