UE Beam Reporting with CSI-RS CMR and IMR Configuration
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Solution Overview
Problem
Existing channel quality reporting processes in wireless communication systems do not adequately accommodate large two-dimensional array transmit antennas, failing to effectively report channel state information and interference measurements.
Innovation Solution
The implementation of user equipment (UE) and base station (BS) configurations that utilize channel state information reference signals (CSI-RSs) for channel and interference measurement, including parameters for channel measurement resources (CMR) and interference measurement resources (IMR), with the ability to select between received signal power (RSRP) and signal-to-interference-plus-noise ratio (SINR) for beam reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing channel quality reporting processes are used, then the system maintains simplicity in reporting mechanisms, but the system fails to adequately accommodate large two-dimensional array transmit antennas and effectively report channel state information
Solution Approach 1:
The patent segments the channel state information reporting into multiple independent components: beam management information (CRI, L1-RSRP, L1-SINR) and CSI reporting (CQI, PMI, RI). This segmentation allows the system to handle large two-dimensional antenna arrays by reporting beam-level metrics separately from traditional CSI, making the overall process more manageable and adaptable to massive MIMO configurations
Solution Approach 2:
The patent introduces a new dimension to channel reporting by adding beam-specific measurements (CRI, L1-RSRP, L1-SINR) alongside traditional CSI reporting. This dimensional expansion enables the system to capture spatial beam information in addition to traditional channel quality metrics, providing comprehensive support for large two-dimensional antenna arrays without fundamentally complicating the existing reporting framework
2Measurement precision
If separate CSI-RS configurations for channel and interference measurement are implemented, then the measurement precision is improved, but the configuration complexity increases
Solution Approach 1:
The patent implements a universal CSI-RS configuration framework where a single CSI-RS resource configuration can serve multiple purposes: channel measurement (CMR), interference measurement (IMR), and beam management. This multi-functionality allows the system to achieve precise separate measurements of channel and interference while avoiding the complexity of entirely separate configuration procedures, as the same resource structure is reused across different measurement functions
Solution Approach 2:
The patent achieves separate channel and interference measurement by changing specific parameters within the CSI-RS configuration rather than creating entirely separate configuration structures. By modifying parameters such as resource allocation, port allocation, and measurement purpose indicators, the system can precisely configure CMR and IMR functions using a unified configuration framework, thereby improving measurement precision without proportionally increasing configuration complexity
3Measurement precision
If comprehensive beam reporting with multiple parameters is implemented, then the beamforming accuracy is improved, but the reporting overhead increases
Solution Approach 1:
The patent segments beam reporting into distinct parameter groups: beam identification (CRI), signal quality metrics (L1-RSRP, L1-SINR), and links them to specific CSI-RS resources. This segmentation allows the system to report comprehensive beam information in a structured, efficient manner, reducing overhead compared to unstructured comprehensive reporting while maintaining high beamforming accuracy through the inclusion of multiple relevant parameters
Data Source
AI summary
Methods and apparatuses for uplink multi-beam operation. A method for operating a user equipment (UE) includes receiving from a base station (BS), configuration information on channel state information reference signals (CSI-RSs) and configuration information on beam reporting, measuring the CSI-RSs for calculating the beam reporting, and transmitting the beam reporting. The configuration information on the CSI-RSs includes at least one parameter for a channel measurement resource (CMR) and at least one parameter for an interference measurement resource (IMR). At least one of the CSI-RSs is configured as a CMR and at least one other of the CSI-RSs is configured as an IMR. The configuration information on the beam reporting includes a selection between RS received power (RSRP) and signal-to-interference-plus-noise ratio (SINR).