Joint P3 Sweep Aggregated CSI Reporting for 5G Beam Management
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Solution Overview
Problem
Current beam management procedures in 5G NR systems require multiple separate P3 sweeps and CSI reports for optimizing performance between four CSI-RS ports, which is sub-optimal and inefficient.
Innovation Solution
The TRP indicates to the UE to perform a joint P3 sweep across all four CSI-RS ports, allowing the UE to determine a common RX beam setting and report aggregated channel state information in a single CSI report, thereby optimizing performance and reducing the number of sweeps needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple separate P3 sweeps are performed for four CSI-RS ports, then beam management completeness is improved, but signaling overhead and procedure complexity increase
Solution Approach 1:
The patent combines multiple separate P3 sweeps into a single joint P3 sweep procedure that handles all four CSI-RS ports simultaneously. The TRP transmits CSI-RS resources across multiple antenna panels in one coordinated sweep, and the UE performs channel measurements and determines RX beam settings for all ports in a unified process, ultimately reporting aggregated CSI in one report. This merging eliminates the need for multiple separate sweeps and reduces procedural complexity while maintaining complete beam management coverage.
2Reliability
If multiple separate P3 sweeps are performed for four CSI-RS ports, then beam management completeness is improved, but time consumption and efficiency worsen
Solution Approach 1:
The patent merges multiple sequential P3 sweeps into a single joint P3 sweep that processes all four CSI-RS ports concurrently. The TRP coordinates CSI-RS transmissions across antenna panels in one sweep sequence, and the UE performs channel measurements and RX beam determination for all ports simultaneously. This consolidation reduces the total time required for beam management while ensuring complete coverage of all ports, thereby improving productivity without sacrificing reliability.
3Measurement precision
If separate CSI reports are sent for each P3 sweep, then measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent combines multiple separate CSI reports into a single aggregated CSI report that contains channel state information for all four ports. The UE performs precise channel measurements on CSI-RS resources from multiple antenna panels and consolidates the results into one comprehensive report containing aggregated CSI, precoding matrix indicators, and rank information. This single report mechanism maintains measurement precision while significantly reducing signaling overhead compared to transmitting separate reports for each port or sweep.
Data Source
AI summary
In one aspect, a base station (e.g., a TRP) transmits an indication of a joint P3 sweep to a wireless device which triggers the wireless device (e.g., a UE) to perform the joint P3 sweep. In another aspect, the wireless device performs the joint P3 sweep by obtaining measurements based on a first set and second set of one or more one-port or two-port channel state information reference signal (CSI-RS) transmissions from the TRP. The wireless device determines the aggregated channel estimation based on the obtained measurements. The wireless device determines at least one or more of a precoding matrix indicator (PMI), a modulation and coding scheme (MCS), and a rank based on the determined aggregated channel estimation and reports the determined at least one or more PMI, MCS, and rank in one channel state information (CSI) report.