Flexible Uplink Precoding Indication with Codebook Groups
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Solution Overview
Problem
The existing predefined uplink codebooks in 5G communication systems are limited in supporting a large number of transmit antenna ports, limiting uplink transmission performance as they cannot adapt to the increasing requirements of higher system capacity and spectral efficiency.
Innovation Solution
A method and apparatus that enable a flexible uplink precoding matrix indicator by using a predefined codebook to support terminal devices with more antenna ports, allowing for the selection of codewords with the same coherent capability, reducing bit overheads, and maintaining compatibility with existing protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a predefined uplink codebook is used for codebook-based uplink transmission, then the transmission process is simplified and compatibility is maintained, but the quantity of supported transmit antenna ports and uplink transmission layers is limited
Solution Approach 1:
The codebook is segmented into multiple codebook groups, where each group corresponds to a specific quantity of transmit antenna ports. The network device can indicate different codebook groups based on the terminal's antenna port configuration, allowing the system to support various antenna port quantities (2, 4, 8, or 16 ports) using the same predefined codebook structure without requiring a complete redesign for each configuration.
Solution Approach 2:
The patent introduces a new dimension of codebook group indication alongside the traditional TPMI (Transmitted Precoding Matrix Indicator). By adding codebook group indication information, the system can select from multiple codebook groups with different antenna port configurations, effectively expanding the supported antenna port quantity without increasing the complexity of individual codebook structures.
2Adaptability or versatility
If the codebook is redesigned to support more antenna ports, then adaptability to terminal devices with more antenna ports is improved, but the impact on existing protocols increases and forward compatibility is reduced
Solution Approach 1:
The predefined codebook is designed to be universal across different antenna port configurations. By organizing the codebook into multiple groups that can accommodate 2, 4, 8, or 16 antenna ports, the same codebook structure serves multiple functions and configurations. This universal design allows the system to adapt to terminal devices with varying antenna port quantities while maintaining compatibility with existing protocols and preserving forward compatibility.
3Adaptability or versatility
If more codewords are added to the codebook to support more antenna ports, then the supported antenna port quantity increases, but the bit overhead for codebook indication increases
Solution Approach 1:
The codebook is segmented into multiple codebook groups, each handling a specific antenna port configuration. This segmentation allows the system to indicate only the relevant codebook group based on the terminal's antenna port quantity, rather than providing indication information for all possible codewords across all configurations. This significantly reduces the bit overhead for codebook indication while still supporting a wide range of antenna port quantities.
Data Source
AI summary
This application provides an uplink precoding indication method including: sending first indication information and third indication information when a quantity of uplink transmission layers of a terminal device is less than or equal to X; or sending first indication information, second indication information, and third indication information when a quantity of uplink transmission layers is greater than X, where the first indication information indicates an index of a first codeword in a first codebook and a quantity of uplink transmission layers of the first codeword, the second indication information indicates an index of a second codeword in the first codebook and a quantity of uplink transmission layers of the second codeword, the third indication information indicates that the quantity of uplink transmission layers of a terminal device is greater than X, and the second codeword and the first codeword have a same coherent capability.