Uplink Antenna Selection for Multi-Config Wireless Devices
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Solution Overview
Problem
Current LTE protocols only support uplink antenna selection for 1T2R configurations, failing to effectively address antenna selection for devices with varying capabilities, such as 1T4R, 2T4R, and 1T8R, which limits efficient uplink information transmission.
Innovation Solution
An uplink antenna selection method that determines a target precoding matrix based on the number of layers and physical antennas, using a codebook to identify a physical antenna for uplink information transmission, ensuring optimal energy allocation and minimizing inter-channel interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE protocol supports uplink antenna selection only for 1T2R configuration, then existing protocol compatibility is maintained, but antenna selection cannot be performed for devices with varying capabilities (1T4R, 2T4R, 1T8R)
Solution Approach 1:
The codebook is designed to support multiple antenna configurations (1T2R, 1T4R, 2T4R, 1T8R) through a unified structure. The same codebook can be used across different UE capabilities by appropriately selecting precoding matrices, making the protocol universal and adaptable to various device types without requiring separate protocols for each configuration.
Solution Approach 2:
The solution changes the parameter of codebook structure to accommodate different antenna configurations. By defining a codebook with specific properties (including normalization coefficients and structured precoding matrices), the system can adapt to different numbers of transmit and receive antennas through parameter selection rather than protocol modification.
2Adaptability or versatility
If codebook is designed to support multiple antenna configurations, then adaptability to different UE capabilities is improved, but codebook design complexity increases
Solution Approach 1:
The codebook is segmented into different codebook sets (e.g., Codebook Set 0 and Codebook Set 1) that can be selectively used based on UE capability and transmission conditions. This segmentation allows the system to manage complexity by only activating relevant codebook portions for specific device types while maintaining overall adaptability across configurations.
Solution Approach 2:
Different portions of the codebook are optimized for different antenna configurations. The codebook contains precoding matrices with specific local structures (e.g., different normalization coefficients for different row patterns) that are locally optimized for specific UE capabilities, allowing adaptable support without uniformly increasing complexity throughout the entire codebook.
3Reliability
If precoding matrix is selected based on channel quality, then uplink transmission performance is improved, but selection process complexity increases
Solution Approach 1:
The codebook is pre-designed with normalization coefficients and structured precoding matrices that account for different antenna configurations before transmission occurs. This preliminary structuring eliminates the need for complex real-time calculations during antenna selection, as the UE can directly select from pre-optimized matrices based on channel quality measurements, improving reliability while controlling complexity.
Data Source
AI summary
A method includes: receiving, from a network device, an index of a precoding matrix and a quantity of layers for uplink transmission; determining a first target codebook based on the quantity of layers for uplink transmission and a quantity of physical antennas of a communications apparatus, where the first target codebook includes a plurality of first precoding matrices; and determining, based on a first target precoding matrix that corresponds to the index and that is in the plurality of first precoding matrices, a target physical antenna used by the communications apparatus to send uplink information.