Uplink Precoder Determination for Multi-Antenna Terminals
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Solution Overview
Problem
Current technologies face challenges in determining a precoding matrix for uplink transmission using more than four antenna ports, which is essential for achieving higher spectrum efficiency in future NR systems.
Innovation Solution
A terminal equipped with a control section that determines a precoder based on a codebook for transmission with a certain number of layers, enabling uplink transmission using more than four antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink transmission uses more than four antenna ports to achieve higher spectrum efficiency, then communication throughput is improved, but the complexity of determining precoding matrices increases
Solution Approach 1:
The patent segments the precoding matrix determination process into two independent parts: a transform precoder that operates on transformed signals and a codebook-based precoder that provides spatial filtering. This segmentation allows each component to be optimized independently, reducing the overall complexity of determining precoding matrices for multi-layer transmissions with more than four antenna ports.
Solution Approach 2:
The patent introduces a transform precoder as an intermediary component between the signal source and the codebook-based precoder. This transform precoder performs transformations on the signals before they are processed by the codebook, effectively mediating the precoding process and simplifying the determination of final precoding matrices for high-layer transmissions.
2Productivity
If codebooks for 1 to 8-layer transmissions using 8 antenna ports are developed, then spectrum efficiency is improved, but the complexity of the system increases
Solution Approach 1:
The patent creates a universal codebook structure that can support multiple transmission layers (1 to 8 layers) and multiple antenna port configurations (4 to 8 antenna ports) through a single unified design. This multi-functional codebook reduces the need for separate codebooks for each configuration, thereby reducing overall system complexity while maintaining high spectrum efficiency.
Solution Approach 2:
The patent implements a dynamic precoding mechanism where the transform precoder can adaptively process signals based on the actual transmission configuration. This dynamic approach allows the system to efficiently handle variable numbers of layers and antenna ports without requiring static, configuration-specific codebooks, thus reducing complexity.
3Productivity
If UL MIMO transmission supports up to four layers in Rel-15 NR, then the system is stable and well-defined, but spectrum efficiency is limited compared to future requirements
Solution Approach 1:
The patent embeds the existing Rel-15 NR four-layer MIMO functionality within a broader eight-layer capable framework. The codebook and transform precoder are designed to nest the traditional four-layer operation within the extended eight-layer capability, allowing the system to maintain backward compatibility while providing forward-looking high-capacity transmission when needed.
Solution Approach 2:
The patent enables transition from four-layer to eight-layer transmission by changing key system parameters, particularly the codebook size and transform precoder dimensions. This parameter-based extension allows the system to scale capacity without fundamentally redesigning the MIMO architecture, thus maintaining stability while improving spectrum efficiency.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a control section that determines a precoder, based on a codebook for transmission with a certain number of layers, the transmission using more than four antenna ports, and a transmitting section that performs uplink transmission, based on the precoder. According to one aspect of the present disclosure, it is possible to appropriately control UL transmission using more than four antenna ports.