Uplink Codebook Design for 5G Antenna Port Grouping
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Solution Overview
Problem
Current 5G/NR wireless communication systems face challenges in efficiently managing uplink codebooks for multiple antenna ports, particularly in codebook-based transmission schemes, which affect precoding matrix design and transmission efficiency.
Innovation Solution
The design of uplink codebooks for 8 antenna ports, partitioned into Ng groups, using full-coherent and partial-coherent precoding matrices, based on legacy codebooks from Rel. 15, to enhance transmission efficiency and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of antenna ports is increased to support massive MIMO and increase capacity, then the system capacity and beamforming gain are improved, but the codebook size and signaling overhead increase significantly
Solution Approach 1:
The codebook for 8 antenna ports is segmented into multiple codebook subsets (e.g., 2-bit or 3-bit subset indicators) rather than using a single large codebook. This segmentation allows the system to support 8 antenna ports while reducing the signaling overhead by only indicating a subset rather than the entire codebook, thus resolving the contradiction between supporting massive MIMO capacity and reducing signaling overhead.
2Adaptability or versatility
If a large codebook is used to support more antenna ports and configurations, then the adaptability and versatility of the system are improved, but the device complexity and processing requirements increase
Solution Approach 1:
The large codebook for 8 antenna ports is divided into multiple smaller codebook subsets, each handling specific antenna port configurations or precoding scenarios. This segmentation reduces the processing complexity by limiting the search space and computational requirements while maintaining adaptability through the selection of appropriate subsets based on channel conditions and configuration.
Solution Approach 2:
Instead of processing or transmitting the entire large codebook, the system uses partial action by selecting and indicating only relevant codebook subsets (e.g., using 2-bit or 3-bit indicators). This partial approach reduces complexity while providing sufficient versatility for various antenna configurations by selectively activating only the necessary codebook portions.
Data Source
AI summary
Apparatuses and methods for uplink (UL) codebook design are provided. A method performed by a user equipment (UE) is provided. The method includes receiving a configuration about an uplink (UL) codebook (C8) for N=8 antenna ports partitioned into Ng groups; receiving an indication indicating a transmit precoding matrix indicator (TPMI) for transmission of a physical uplink shared channel (PUSCH); and transmitting the PUSCH based on the indicated TPMI. The TPMI indicates a precoding matrix (W) from the UL codebook (C8) and the precoding matrix (W) is based on up to K submatrices. Each of the K submatrices is a full-coherent (FC) precoding matrix forP=NNgantenna ports and is associated with one of the Ng groups, K∈{1, . . . , Ng} and Ng∈{2, 4}.