Uplink Codebook Indication for More Than Four Antenna Ports
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Solution Overview
Problem
Existing 5G NR protocols only support uplink transmission for terminal devices with up to four transmit antenna ports, limiting the potential for increased data throughput with advancements in MIMO technology.
Innovation Solution
A method for determining and indicating uplink precoding matrices for terminal devices with more than four antenna ports, utilizing submatrices and indication information to enable uplink transmission, including non-fully-coherent precoding matrices to reduce calculation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the terminal device uses more than four transmit antenna ports to increase uplink data throughput, then the spectral efficiency and data throughput are improved, but the protocol does not support codebook based uplink transmission for more than four antenna ports
Solution Approach 1:
The precoding matrix is divided into multiple submatrices, each corresponding to a specific set of antenna ports. The codebook is segmented into multiple subsets, where each subset contains precoding matrices for a specific number of antenna ports (e.g., 2Tx, 4Tx, 8Tx). This segmentation allows the protocol to support more than four antenna ports by selecting appropriate submatrices and subsets based on the terminal device's capability.
Solution Approach 2:
The protocol dynamically adapts the codebook structure and precoding matrix selection based on the terminal device's antenna port capability. The network device determines which submatrices and codebook subsets to use based on terminal capability information, enabling flexible support for different numbers of antenna ports (2, 4, or 8) without requiring a completely new protocol definition.
2Productivity
If the terminal device performs uplink precoding with more antenna ports, then the spatial degree of freedom and spectral efficiency are improved, but the calculation complexity increases
Solution Approach 1:
The precoding matrix is divided into multiple submatrices, each corresponding to a specific set of antenna ports. The codebook is segmented into multiple subsets, where each subset contains precoding matrices for a specific number of antenna ports (e.g., 2Tx, 4Tx, 8Tx). This segmentation allows the protocol to support more than four antenna ports by selecting appropriate submatrices and subsets based on the terminal device's capability.
Solution Approach 2:
The codebook is pre-configured with multiple subsets of precoding matrices, each optimized for a specific number of antenna ports. The network device and terminal device agree in advance on which subset to use based on capability information, avoiding the need for real-time calculation of optimal precoding matrices for large numbers of antenna ports.
3Adaptability or versatility
If the protocol defines codebooks for only two and four transmit antenna ports, then the protocol complexity is kept low, but the terminal device cannot utilize more antenna ports for uplink transmission
Solution Approach 1:
The codebook structure is designed to be universal, with a single codebook containing multiple subsets that can support different numbers of antenna ports (2, 4, or 8). The same codebook structure and selection mechanisms work for all supported antenna configurations, eliminating the need for separate codebook definitions for each antenna port count.
Solution Approach 2:
The protocol dynamically adapts the codebook structure and precoding matrix selection based on the terminal device's antenna port capability. The network device determines which submatrices and codebook subsets to use based on terminal capability information, enabling flexible support for different numbers of antenna ports without requiring a completely new protocol definition.
Data Source
AI summary
Embodiments of this application provide an uplink codebook indication method and a communication apparatus that can enable a terminal device with more transmit antenna ports to perform uplink transmission and that may be applied to a 5G system. The method includes: A terminal device receives first information from a network device, and determines, based on both first indication information in the first information and a first index value indicated by second indication information, an uplink precoding matrix used to precode 2N antenna ports. In this way, the terminal device can enable, based on the uplink precoding matrix, the 2N antenna ports for uplink transmission, where N is a positive integer.