UE Mutual Information Reporting for Correlated Receive Beams
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Solution Overview
Problem
Existing beam management procedures in wireless communications systems do not adequately account for correlations between receive beams, leading to lower achievable ranks in multi-beam operations.
Innovation Solution
The network entity configures the user equipment (UE) with multiple CSI-RS resource configurations to report a mutual information (MI) metric, which accounts for both the quality and correlation of transmit and receive beams, enabling selection of higher-quality beam pairs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing beam management procedures are used without accounting for receive beam correlations, then the system operation is simpler, but the achievable rank is lower
Solution Approach 1:
The patent implements feedback mechanisms where the UE reports beam quality metrics (such as RSRP, SINR, or mutual information) back to the network entity. This feedback enables the network to adjust beam configurations and select beam pairs that maximize the achievable rank while accounting for receive beam correlations, thus resolving the contradiction between operational simplicity and performance optimization
Solution Approach 2:
The patent changes the parameters used for beam selection from traditional single-metric criteria to multi-metric criteria that include mutual information and beam correlation coefficients. By modifying the selection parameters to account for receive beam correlations, the system achieves higher ranks without proportionally increasing complexity
2Measurement precision
If multiple CSI-RS resource configurations are configured to report MI metrics, then the beam pair quality is improved, but the configuration complexity increases
Solution Approach 1:
The patent segments the beam management process into distinct phases: initial beam sweeping using CSI-RS resources, mutual information measurement phase, and beam pair selection phase. Each phase uses specific configured resources, allowing precise measurement without requiring all resources to be active simultaneously, thus reducing overall configuration complexity while maintaining measurement precision
Solution Approach 2:
The patent performs preliminary beam sweeping and mutual information measurement using configured CSI-RS resources before final beam pair selection. This preliminary action allows the system to pre-identify promising beam pairs and pre-calculate mutual information metrics, reducing the complexity of real-time beam selection while improving assessment accuracy
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. The described techniques may enable a user equipment (UE) to account for receive beam correlation while selecting a pair of receive beams. For example, a network entity may configure the UE with multiple channel state information reference signal (CSI-RS) resource configurations. In some examples, the network entity may configure the UE with a report configuration for each of the CSI-RS resource configurations, and may select a CSI-RS resource configuration for the UE to report mutual information (MI). In some examples, the network entity may configure the UE with a single report configuration, and the UE may select a CSI-RS resource configuration to report MI. In some examples, the network entity may configure the UE with two CSI-RS resource configurations, and the UE may report an MI metric for a single CSI-RS resource in each CSI-RS resource configuration.