Codebook Support for Non-Uniform Antenna Arrays in Full Power Mode 2
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Solution Overview
Problem
Current 3GPP NR specifications are limited in supporting non-uniform antenna arrays and multiple antenna panels, as they are designed for uniform arrays, which restricts the configuration of codebooks for uplink transmissions, especially in full power mode 2, where user equipment (UE) with up to 8 transmit antennas faces challenges in efficient antenna virtualization.
Innovation Solution
The proposed solution involves generating codebooks for non-uniform antenna arrays and multiple antenna panels using specific matrix equations, such as W=W1×W2, where W1 represents phase differences among antenna ports and W2 is the precoder, allowing for antenna virtualization to form virtual antenna ports from subsets of transmit antennas, enabling enhanced operation in full power mode 2.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If codebooks are designed for uniform antenna arrays, then the codebook configuration is simple and standardized, but it cannot support non-uniform antenna arrays and multiple antenna panels
Solution Approach 1:
The codebook is segmented into multiple codebook groups, each corresponding to different antenna port configurations (e.g., 2 ports, 4 ports, 8 ports). This allows the system to select appropriate codebook segments based on the actual antenna configuration, enabling support for non-uniform arrays and multiple panels without requiring a completely new codebook design.
Solution Approach 2:
The patent extends the codebook design from traditional 2D antenna arrays to 3D configurations by incorporating multiple antenna panels with different spatial orientations. The codebook groups are designed to accommodate variations in the third dimension (panel configuration), enabling support for non-uniform arrays while maintaining codebook structure.
2Power
If 8 transmit antennas are used in full power mode 2, then the transmission power and capacity are enhanced, but the antenna virtualization and codebook configuration become more complex
Solution Approach 1:
The codebook groups are designed to be universal across different antenna configurations. The same codebook group structure can be applied to 2-port, 4-port, and 8-port configurations by selecting appropriate groups, simplifying the antenna virtualization process for full power mode 2 operations.
Solution Approach 2:
The patent changes the parameter of codebook group selection based on the number of antenna ports and the full power mode configuration. By dynamically selecting codebook groups according to the operational mode, the system can handle 8 transmit antennas in full power mode 2 without requiring complex dedicated codebook designs for each scenario.
Data Source
AI summary
Systems, apparatuses, methods, and computer-readable media are directed to techniques for codebook support for different antenna structures, such as a user equipment (UE) with a non-uniform antenna array (e.g. with different distances between antenna elements) and/or multiple antenna panels. Embodiments further provide techniques for enhanced operation in full power mode 2. For example, embodiments provide techniques for antenna virtualization to form virtual antenna ports from subsets of transmit antennas of the UE (e.g., from eight transmit antennas to two, four, or six virtual antenna ports). Other embodiments may be described and claimed.