Wireless Bandwidth Selection via Noise Feedback
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Solution Overview
Problem
Current bandwidth signaling in wireless communications, as defined by IEEE 802.11 standards, is inadequate for accurate link adaptation as it does not provide sufficient feedback on interference levels, leading to suboptimal modulation and coding scheme selection and increased probability of error in data transmission.
Innovation Solution
Enhanced bandwidth signaling is introduced, where responders provide detailed feedback on noise levels and signal-to-interference-plus-noise ratio (SINR) to initiators, allowing for better adaptation of transmission parameters such as bandwidth, modulation and coding schemes, and number of spatial streams, through modified RTS/CTS frames and new frame exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current bandwidth signaling in IEEE 802.11 standards is used, then device complexity is reduced and ease of operation is maintained, but measurement precision of interference levels is insufficient leading to suboptimal link adaptation
Solution Approach 1:
The patent implements enhanced feedback mechanisms in RTS/CTS frames where the responder device provides detailed feedback on noise levels and SINR measurements to the initiator. This feedback enables more precise interference level measurement while maintaining structured frame formats to control complexity. The feedback includes noise level measurements for different bandwidths and SINR values that guide link adaptation decisions.
Solution Approach 2:
The patent introduces new parameters in bandwidth signaling including noise level indicators and SINR measurements alongside existing bandwidth indicators. These parameter changes enable more precise characterization of channel conditions without fundamentally changing the RTS/CTS frame structure, thus improving measurement precision while controlling the increase in device complexity.
2Reliability
If detailed noise level and SINR feedback is provided in RTS/CTS frames, then link adaptation accuracy is improved, but frame size and processing complexity increase
Solution Approach 1:
The patent segments the feedback information into distinct fields within the RTS/CTS frames, with separate noise level indicators and SINR measurements for different bandwidths. This segmentation allows the receiver to process only the relevant information for current transmission conditions, reducing processing complexity while maintaining comprehensive link adaptation accuracy.
Solution Approach 2:
The patent implements partial feedback by providing noise level and SINR information selectively based on transmission conditions and bandwidth requirements. Rather than always providing maximum detail, the feedback includes only the necessary measurements for current link adaptation needs, reducing frame processing complexity while maintaining reliability.
3Reliability
If bandwidth signaling does not include interference level feedback, then signaling overhead is reduced, but modulation and coding scheme selection becomes suboptimal increasing error probability
Solution Approach 1:
The patent implements feedback mechanisms where the responder device measures and reports noise levels and SINR values in the CTS frame response to the RTS frame. This feedback provides the initiator with interference level information necessary for optimal MCS selection, thereby improving data transmission reliability without significant information loss.
Solution Approach 2:
The patent replaces the inadequate bandwidth-only signaling mechanism with an enhanced signaling mechanism that incorporates noise level and SINR measurements. This substitution transforms the information-complete nature of the signaling, enabling reliable MCS selection by providing both bandwidth and interference level information in a unified framework.
Data Source
AI summary
This disclosure describes systems, methods, and devices related to enhanced bandwidth selection for wireless devices. A device may generate a request frame with at least one of a first indication of a bandwidth for which a second device is to measure a first noise level or a second indication of a resource unit for which the second device is to measure a second noise level. The device may send the request frame to the second device. The device may identify a response frame received from the second device, the response frame having a third indication of the first noise level or the second noise level and a fourth indication of the bandwidth or the resource unit. The device may determine, based on the first noise level or the second noise level, a parameter associated with a subsequent frame to send to the second device.