Compressed CSI Feedback Coefficient Reporting Method
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR and LTE, face challenges in efficiently reporting compressed channel state information (CSI) due to the high number of linear combination coefficients, leading to significant overhead in data transmission.
Innovation Solution
The implementation of a 2D amplitude reporting method for joint amplitude and location indication, along with quantized phase and differential amplitudes, allows user equipment (UE) to report a subset of linear combination coefficients using a reduced number of bits, thereby reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all linear combination coefficients are reported to capture complete CSI information, then measurement precision is improved, but data transmission overhead increases significantly
Solution Approach 1:
The patent extracts only the most significant linear combination coefficients for reporting, rather than transmitting all coefficients. The UE identifies and reports only the top K coefficients with the largest amplitudes, extracting the essential CSI information while eliminating redundant data transmission.
Solution Approach 2:
The patent applies partial action by reporting only a subset (K coefficients) rather than all coefficients. This partial reporting approach maintains sufficient CSI accuracy for practical purposes while significantly reducing the quantity of data transmitted over the wireless channel.
2Measurement precision
If more linear combination coefficients are reported to maintain CSI accuracy, then measurement precision is improved, but loss of time increases due to longer transmission
Solution Approach 1:
The patent extracts and reports only the essential coefficients that contribute most to CSI accuracy. By identifying and transmitting only the top K significant coefficients, the system maintains adequate feedback accuracy while reducing transmission time compared to reporting all coefficients.
Solution Approach 2:
The patent uses partial action by transmitting only the necessary subset of coefficients (K < total number of coefficients). This partial reporting strategy achieves sufficient CSI feedback accuracy in a timely manner, avoiding the time penalty of transmitting all coefficients when most are negligible.
3Measurement precision
If a larger subset of coefficients is reported to improve CSI quality, then measurement precision is improved, but device complexity increases in terms of processing requirements
Solution Approach 1:
The UE autonomously performs amplitude evaluation and coefficient selection without requiring complex external processing. The device self-determines which coefficients to report by evaluating their amplitudes and selecting the top K, simplifying the overall system architecture while maintaining CSI quality.
Solution Approach 2:
The patent changes the parameter of coefficient selection from uniform reporting to amplitude-based selective reporting. By sorting coefficients according to their amplitude magnitudes and selecting based on this parameter, the system achieves good CSI quality with reduced processing complexity compared to handling all coefficients uniformly.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for a coefficients report for compressed channel state information (CSI) feedback. A method for wireless communication by a user equipment (UE) includes receiving a CSI report configuration configuring the UE for reporting precoding matrix information including, a plurality of selected beams L, a frequency domain compression matrix F for each of the L beams at each of a plurality of taps M in the time domain, and a subset of a plurality of linear combination coefficients associated with the frequency domain compression matrices and beams. The UE determines the coefficients based on a first evaluation that is, for each beam, an evaluation of the amplitude of the coefficients across the taps, and a second evaluation and a evaluation that is, for each tap, an evaluation of the amplitude of the linear combination coefficients across the beams. The UE reports the first and second evaluations.