Terminal Uplink TPMI Group Selection for Full Power Transmission
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Solution Overview
Problem
In New Radio (NR) systems, terminal devices with partialCoherent and nonCoherent transmission capabilities face challenges in achieving maximum transmit power due to limitations in power control methods, resulting in suboptimal uplink transmission performance.
Innovation Solution
A communication method that involves sending first indication information to a network device to select a suitable Transmitted Precoding Matrix Indicator (TPMI) group, allowing the terminal device to perform full power transmission by using a target precoding matrix corresponding to the selected TPMI, thereby improving uplink coverage and transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power control is performed according to the conventional method for partialCoherent and nonCoherent terminal devices, then transmission quality and uplink interference control are improved, but the terminal device cannot reach maximum transmit power
Solution Approach 1:
The patent changes the parameter of codebook subset configuration based on the terminal's coherent transmission capability. By configuring different codebook subsets (first codebook subset for fullCoherent, second codebook subset for partialCoherent/nonCoherent), the system enables terminal devices to select precoding matrices that support full power transmission, thereby resolving the power limitation while maintaining transmission quality through appropriate precoding selection.
2Ease of operation
If a codebook subset is selected for partialCoherent and nonCoherent terminal devices, then precoding processing can be performed, but the terminal device is limited from achieving full power transmission
Solution Approach 1:
The patent introduces dynamic selection of codebook subsets based on the terminal's coherent transmission capability reporting. The network device dynamically configures appropriate codebook subsets (first, second, or third codebook subsets) according to the terminal's capability, enabling the terminal to dynamically select precoding matrices that allow full power transmission while maintaining ease of precoding operation.
3Reliability
If the network selects an appropriate precoding matrix from codebook subsets, then transmission performance is improved, but terminal devices with different coherent capabilities require different codebook subsets increasing system complexity
Solution Approach 1:
The patent segments the codebook into multiple codebook subsets (first codebook subset for fullCoherent, second codebook subset for partialCoherent, third codebook subset for nonCoherent) based on terminal coherent transmission capabilities. This segmentation allows the network to select appropriate subsets matching terminal capabilities, improving transmission performance while managing complexity through capability-based classification.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal device reports its coherent transmission capability to the network device. Based on this feedback, the network device configures the appropriate codebook subset, enabling adaptive selection that optimizes transmission performance while managing system complexity through information-driven configuration.
Data Source
AI summary
The present disclosure relates to a communication method and apparatus, a terminal, and a storage medium. A terminal device sends first indication information to a network device, the first indication information being used to indicate a first transmitted precoding matrix indicator (TPMI) group, and the first TPMI group being a TPMI group in a TPMI group set; and then, receives a first TPMI indicated by the network device. By using the described method, the uplink coverage capabilities of a terminal device and the uplink transmission performance of a terminal device can be increased.