Uplink Precoding Matrix Selection via Reference Signal Resource Indication
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Solution Overview
Problem
The challenge lies in effectively selecting a precoding matrix for each Precoding Resource Block Group (PRG) in uplink transmission to ensure efficient data transmission on physical uplink shared channels (PUSCH) in communication systems, as existing methods require additional signaling to differentiate precoding matrices for different PRBs, leading to increased signaling overhead.
Innovation Solution
The method involves setting multiple first PRGs for transmitting reference signals, where each first PRG uses a specific precoding matrix, allowing the network device to select a corresponding precoding matrix for the second PRG based on the reference signal, thereby eliminating the need for additional signaling and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different precoding matrices are used for different PRBs in uplink transmission, then data transmission accuracy is improved, but signaling overhead increases due to additional indication signaling required
Solution Approach 1:
The patent divides the frequency domain into multiple PRGs (Precoding Resource Block Groups), where each PRG can use a different precoding matrix. This segmentation allows the system to apply different precoding strategies to different frequency segments, improving transmission accuracy while managing signaling overhead by grouping PRBs rather than treating each PRB individually.
Solution Approach 2:
The patent enables different precoding matrices to be applied to different PRGs based on local channel conditions. Each PRG can be optimized independently with appropriate precoding, allowing the system to adapt to frequency-selective fading and improve transmission accuracy in specific frequency regions without requiring different precoding for every single PRB.
2Measurement precision
If additional indication signaling is used to specify precoding matrices for each PRG, then precoding matrix selection accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies precoding matrix indication only at the PRG level rather than at the individual PRB level. This partial action approach provides sufficient precoding accuracy for each group of resource blocks without requiring exhaustive indication signaling for every single PRB, thereby reducing system complexity while maintaining adequate transmission performance.
Solution Approach 2:
The patent creates a multi-functional signaling mechanism where the same indication signaling structure serves multiple PRGs simultaneously. The precoding matrix indication can be applied universally across multiple PRGs using a compact signaling format, reducing the overall system complexity compared to individual PRB-level indications.
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AI summary
This application provides a data transmission method, terminal device, and network device. The method includes: sending, by a terminal device, at least one precoded reference signal on at least one reference signal resource corresponding to a first PRG, where different precoding matrixes are used for different reference signals, and the first PRG is a PRG used to transmit a reference signal; receiving, by the terminal device, resource indication information, where the resource indication information indicates a reference signal resource that is corresponding to a second PRG and that is in the at least one reference signal resource, and the second PRG is a PRG used to transmit a physical uplink shared channel PUSCH; and sending, by the terminal device, a precoded PUSCH on the second PRG based on the resource indication information, where a precoding matrix used for the PUSCH is a precoding matrix used for a reference signal sent on the reference signal resource corresponding to the second PRG. In this way, a precoding matrix used to transmit the PUSCH on the second PRG can be effectively selected.