PUSCH Precoding Matrix Constraints for Multi-TRP Panel Uplink
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Solution Overview
Problem
The challenge in determining appropriate precoding matrices for multi-TRP/panel transmission schemes in communication systems is unresolved, particularly when antenna ports are shared across multiple panels, leading to unsupported precoding matrices and impaired PUSCH transmission.
Innovation Solution
A communication method and apparatus that configures precoding matrices with non-zero elements less than or equal to M/N, ensuring compatibility with multi-TRP/panel transmission requirements, and utilizes DCI to indicate these matrices for simultaneous PUSCH transmissions across different panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If precoding matrices are configured for multi-TRP/panel transmission with shared antenna ports, then uplink transmission capability is improved, but precoding matrix compatibility deteriorates
Solution Approach 1:
The patent changes the parameter constraint for precoding matrices by limiting non-zero elements to at most M/N per column, where M is total antenna ports and N is number of panels. This parameter modification ensures compatibility between precoding matrices and multi-TRP/panel transmission schemes while maintaining improved uplink transmission capability through shared antenna ports
2Device complexity
If antenna ports are shared across multiple panels, then device complexity is reduced, but transmission reliability deteriorates
Solution Approach 1:
The patent applies local quality by assigning different precoding matrices from the first set to different panels (first panel, second panel, etc.), where each panel uses precoding matrices with non-zero elements constrained to specific positions. This localized precoding configuration ensures each panel transmits reliably while sharing antenna ports, reducing overall device complexity
Data Source
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AI summary
A communication method and a communication apparatus are provided. The communication method includes the following. A terminal device sends a first physical uplink shared channel (PUSCH) and a second PUSCH. The terminal device corresponds to N sounding reference signal (SRS) resource sets, the first PUSCH is associated with a first SRS resource set among the N SRS resource sets, the second PUSCH is associated with a second SRS resource set among the N SRS resource sets, and the first SRS resource set is different from the second SRS resource set. The terminal device includes M antenna ports. A first precoding matrix for the first PUSCH and a second precoding matrix for the second PUSCH belong to a first precoding matrix set, a non-zero element in a column vector of each precoding matrix in the first precoding matrix set is less than or equal to M/N, and M and N are integers greater than or equal to 2. With the method in embodiments of the present disclosure, precoding matrices for multiple PUSCHs sent by the terminal device can meet the transmission requirements of the multi-transmission reception point (TRP)/panel transmission scheme.