Link Adaptation Reporting via Noise Feedback in CTS Frames
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Solution Overview
Problem
In wireless local area networks (WLANs), devices face challenges in efficiently adapting to changing interference levels when switching channels, leading to potential data loss due to misjudged channel clearness and interference, especially when newer and legacy devices operate on different protocols and bands.
Innovation Solution
Implementing a method for link adaptation reporting that includes noise level information in Clear to Send (CTS) frames, allowing the transmitter to adjust encoding rates based on real-time channel conditions, thereby preventing data loss and ensuring reliable communication across channel switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices switch channels in WLAN networks, then they can access different frequency bands and protocols, but they face increased interference and misjudged channel clearness leading to data loss
Solution Approach 1:
The patent implements a feedback mechanism where the receiving device measures noise levels on the target channel before the transmitting device switches, and reports this information back to the transmitter. This feedback loop enables the transmitter to adjust its encoding rate based on actual channel conditions, resolving the contradiction by making channel switching adaptive to real-time interference levels while maintaining communication reliability
Solution Approach 2:
The patent applies preliminary action by having the receiving device measure and report noise levels on the target channel before the actual channel switch occurs. This advance information allows the transmitting device to prepare appropriate encoding rates in advance, preventing data loss during the transition and enabling reliable communication across channel switches
2Productivity
If devices use higher encoding rates to increase throughput, then data transmission speed improves, but data loss increases due to interference and noise
Solution Approach 1:
The patent implements dynamic encoding rate adjustment where the encoding rate is not fixed but adapts to real-time channel conditions. The receiving device continuously measures noise levels and reports them to the transmitter, which then dynamically selects the appropriate encoding rate. This dynamic approach resolves the contradiction by allowing high throughput when conditions are good while preventing data loss when interference is detected
Solution Approach 2:
The patent changes the encoding rate parameter based on measured noise levels. When noise levels are low, higher encoding rates are used to maximize throughput; when noise levels increase, the encoding rate is reduced to prevent data loss. This parameter adjustment strategy resolves the contradiction between productivity and reliability by making the encoding rate a variable that responds to channel conditions
Data Source
AI summary
Methods, apparatuses, and computer readable media for providing link adaptation information, where a station (STA) comprises processing circuitry configured to: decode, from an access point (AP), a request to send (RTS) frame, determine link adaptation information, and encode, for transmission to the AP, a clear-to-send (CTS) frame, the CTS frame comprising an indication of the link adaptation information. And where an AP comprises processing circuitry configured to: encode, for transmission to a STA, a RTS frame, decode, from the STA, a CTS frame, the CTS frame comprising an indication of the link adaptation information, determining an encoding rate for a PPDU based on the link adaptation information, and encode, for transmission to the STA, the PPDU.