Beamforming Feedback Subcarrier Index Determination
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Solution Overview
Problem
Current WLAN systems face challenges in efficiently transmitting and receiving beamforming feedback information, particularly in multi-channel bonding scenarios, which affects the accuracy and efficiency of channel information feedback.
Innovation Solution
A method for configuring beamforming feedback information by determining feedback subcarrier indices based on the Ng value of subcarrier groupings and the number of bonded channels (NCB), allowing for selective channel information feedback, and employing a nested structure to simplify hardware implementation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beamforming feedback information is transmitted for all subcarriers in multi-channel bonding scenarios, then channel estimation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent segments the feedback subcarriers into specific patterns rather than feedback all subcarriers. It defines selective feedback subcarrier indices based on channel bonding configuration (NCB) and subcarrier grouping (Ng), transmitting feedback only for these selected subcarriers. This segmentation reduces the quantity of feedback information while maintaining channel estimation accuracy through strategic subcarrier selection.
Solution Approach 2:
The patent applies partial action by transmitting beamforming feedback information for only a subset of subcarriers rather than all subcarriers. The feedback subcarrier indices are selectively determined based on Ng and NCB values, providing sufficient channel information for beamforming operations without the excessive overhead of complete subcarrier feedback.
2Adaptability or versatility
If beamforming feedback is configured for all channel bonding configurations, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal feedback subcarrier index determination method that works across multiple channel bonding configurations (NCB=1,2,3,4) and subcarrier grouping values (Ng). The same mathematical formulation and index selection process applies universally to all configurations, enabling adaptable beamforming feedback without requiring separate complex hardware for each configuration.
Solution Approach 2:
The patent uses parameter changes in Ng and NCB values to adapt the feedback subcarrier indices to different channel bonding configurations. By changing these parameters, the system dynamically adjusts the feedback subcarrier selection pattern, achieving versatility across configurations while maintaining a consistent, relatively simple determination process that avoids excessive hardware complexity.
3Reliability
If comprehensive beamforming feedback information is transmitted, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent extracts only the essential beamforming feedback information from all available subcarrier data. By identifying and transmitting feedback only for the determined subset of subcarriers (based on Ng and NCB), it removes redundant information while retaining the critical channel characteristics needed for reliable beamforming operations, thus reducing feedback transmission time.
Solution Approach 2:
The patent applies partial action by transmitting beamforming feedback for a selective subset of subcarriers rather than all subcarriers. This partial feedback approach maintains sufficient reliability for beamforming operations by focusing on representative subcarriers, while significantly reducing the time required for feedback transmission compared to comprehensive all-subcarrier feedback.
Data Source
AI summary
Disclosed herein are a method for transmitting and receiving beamforming feedback information in a wireless local access network system and devices supporting the same. Particularly, disclosed herein are a method for transmitting and receiving beamforming feedback information related to feedback subcarrier indices, where the feedback subcarrier indices is determined based on a Ng value of subcarrier groupings and a number NCB of bonded channel.