Partial Bandwidth Feedback for 480/640 MHz Wi-Fi Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently providing partial bandwidth feedback for 480 and 640 MHz transmission in Wi-Fi, which affects beamforming and channel estimation accuracy.
Innovation Solution
The implementation of a method that includes a partial bandwidth information field in a null data packet announcement frame, which indicates the frequency resolution and feedback bitmap, allowing devices to provide feedback only on specific portions of the channel bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full bandwidth feedback is provided for 480/640 MHz transmission, then beamforming accuracy is improved, but feedback overhead and processing complexity increase significantly
Solution Approach 1:
The feedback mechanism is segmented into multiple subchannels (e.g., 80 MHz subchannels within a 480/640 MHz bandwidth), allowing the receiving device to provide feedback only for specific frequency portions rather than the entire bandwidth. This segmentation reduces the feedback overhead while maintaining beamforming accuracy for the active subchannels.
Solution Approach 2:
Instead of requiring full bandwidth feedback, the system implements partial bandwidth feedback where only the necessary frequency portions are feedback-provided. The NDPA frame includes a feedback bitmap that indicates which subchannels require feedback, enabling partial action that suffices for beamforming while reducing complexity.
2Measurement precision
If frequency resolution is increased for 480/640 MHz channels, then channel estimation accuracy is improved, but the number of feedback bits required increases
Solution Approach 1:
The frequency resolution is applied locally to specific subchannels rather than uniformly across the entire bandwidth. The feedback mechanism provides high-resolution channel estimation for the active subchannels while using coarser resolution or no feedback for inactive subchannels, reducing the total number of feedback bits required.
Solution Approach 2:
The feedback mechanism dynamically adjusts the frequency resolution based on the actual transmission requirements. The NDPA frame signals the receiving device to provide feedback at appropriate resolution levels for each subchannel, allowing dynamic adaptation that reduces overall feedback bit quantity while maintaining necessary estimation accuracy.
3Reliability
If feedback is provided for all subchannels, then beamforming performance is optimized, but transmission time and efficiency are reduced
Solution Approach 1:
The feedback process is segmented by identifying which subchannels are actually used for transmission. The feedback bitmap in the NDPA frame enables the receiving device to provide feedback only for active subchannels, reducing the time required for feedback transmission while maintaining beamforming performance for the relevant frequency portions.
Solution Approach 2:
The system implements partial feedback where only the necessary subchannels are feedback-provided based on the NDPA frame indication. This partial action eliminates unnecessary feedback processing time for inactive subchannels, improving transmission efficiency while preserving beamforming performance for the active frequency portions.
Data Source
AI summary
This disclosure provides methods, components, devices and systems for partial bandwidth feedback for 480 and 640 MHz transmission in Wi-Fi. Some aspects more specifically relate to the inclusion of a partial bandwidth information field in a null data packet (NDP) announcement frame that indicates for which frequency portions of the 480 or 640 MHz channel bandwidth to generate channel information feedback. In some examples, a receiving device (for example, a station (STA)) may perform channel estimation on an NDP and transmit a beamforming report to the transmitting device (for example, an access point (AP)) based on the NDP. The transmitting device schedules the NDP using an NDP announcement frame, which includes the partial bandwidth information field. The partial bandwidth information field in the NDP announcement frame may include a frequency resolution field and a bitmap with values and lengths based on the channel bandwidth being 480 or 640 MHz.