Subband Uplink Precoding With Compressed Frequency-Domain Signaling
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Solution Overview
Problem
There is a need for improved techniques in wireless communication systems, particularly in NR and LTE, to enhance uplink transmission precoding for better spectral efficiency and integration with other wireless technologies.
Innovation Solution
The method involves receiving downlink control information indicating frequency domain bases or linear coefficients for uplink precoding and transmitting a physical uplink shared channel based on this information, utilizing subband level precoding to optimize uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If frequency domain compressed uplink precoding is implemented, then spectral efficiency is improved, but device complexity increases due to additional signaling requirements
Solution Approach 1:
The precoding information is segmented into two parts: first part indicating frequency domain bases and second part indicating linear coefficients. This segmentation allows the UE to process precoding information in a structured manner, improving spectral efficiency while managing signaling complexity through organized information delivery.
Solution Approach 2:
The network entity pre-configures the UE with precoding information including frequency domain bases and linear coefficients before uplink transmission. This preliminary action enables the UE to perform frequency domain compressed precoding without real-time computation complexity, thereby improving spectral efficiency while keeping device complexity manageable.
2Productivity
If subband level precoding is used, then uplink transmission efficiency is enhanced, but information processing requirements increase
Solution Approach 1:
The precoding information is divided into frequency domain bases (first part) and linear coefficients (second part), enabling the UE to process subband level precoding in a structured manner. This segmentation improves uplink transmission efficiency by allowing frequency-selective precoding while managing information processing requirements through organized data structures.
Solution Approach 2:
The system changes the parameter representation from traditional wideband precoding to frequency domain compressed precoding using bases and coefficients. This parameter transformation enables subband level precision for improved transmission efficiency while reducing the overall information processing burden compared to full subband precoding.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for using subband precoding for uplink transmissions. In some cases, a UE may transmit sounding reference signals (SRS) to a network entity, receive information indicating at least one of a set of one or more frequency domain (FD) bases and linear combination coefficients, determined based on the SRS transmission, determine subband precoding based at least in part on linear combinations of the FD bases based on the linear combination coefficients, and transmit a physical uplink shared channel (PUSCH) with the subband precoding.