UE Antenna Port Calibration for Non-Codebook Uplink Precoding
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Solution Overview
Problem
Existing uplink transmission schemes, particularly non-codebook-based transmission, face challenges due to varying UL phase differences between antenna ports, leading to non-optimal precoding and inefficient utilization of antenna arrays in user equipment (UE).
Innovation Solution
The UE determines its multi-antenna port calibration capability by measuring reference signals across multiple ports, generating a calibration capability indicator to facilitate non-codebook-based precoding, enabling efficient phase and amplitude calibration between antenna ports, and transmitting this indicator to the network for optimized precoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If non-codebook-based transmission is used, then uplink precoding flexibility is improved, but antenna array utilization efficiency deteriorates due to varying UL phase differences between antenna ports
Solution Approach 1:
The UE performs preliminary calibration of phase and amplitude responses for multiple antenna ports by measuring downlink reference signals and comparing measurements across different ports. This calibration is performed in advance before actual uplink transmission, allowing the UE to determine calibration capability indicators that enable efficient non-codebook-based precoding without requiring real-time adjustments during transmission.
Solution Approach 2:
The UE measures downlink reference signals and compares the measurements across multiple antenna ports to determine phase and amplitude calibration characteristics. This feedback mechanism allows the UE to characterize its antenna responses and generate calibration capability indicators that inform the network about the UE's calibration status, enabling optimized precoding decisions.
2Manufacturing precision
If multi-antenna port calibration is performed, then phase and amplitude calibration accuracy is improved, but measurement and processing complexity increases
Solution Approach 1:
The UE measures downlink reference signals and uses these measurements to infer characteristics of its uplink antenna ports. By copying the downlink measurement process and comparing results across ports, the UE can determine calibration capability without requiring direct complex measurements of each antenna port's individual response, thereby reducing processing complexity while maintaining calibration accuracy.
Data Source
AI summary
A user equipment, UE, includes at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the user equipment at least to perform determining a multi-antenna port calibration capability of the UE, wherein the multi-antenna port calibration capability depends on a capability of the UE to perform relative phase and/or amplitude calibration between multiple antenna ports of the UE.