Beam Reporting Matrix for 5G MU-MIMO Overhead Reduction
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Solution Overview
Problem
In 5G NR systems, the existing beam reporting and indication schemes for Multi-User Multi-Input Multi-Output (MU-MIMO) techniques result in significant overhead, limiting the flexibility and efficiency of beam management, particularly during downlink transmission where data transmission may fail due to changes in transmit (Tx) or receive (Rx) beams.
Innovation Solution
A Tx beam matrix based reporting scheme is proposed, where the User Equipment (UE) reports groups of Tx beams observed by antenna panels, allowing the Transmission Reception Point (TRP) to reconstruct and indicate suitable Tx beams for simultaneous transmission using a group index, reducing overhead while maintaining flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional beam reporting and indication schemes are used in MU-MIMO systems, then beam management can be performed, but significant overhead is generated
Solution Approach 1:
The patent combines multiple beam reporting functions into a unified beam report message that includes both the beam measurement result and the recommended precoding matrix indicator (PMI). This merging of previously separate reporting elements reduces the total number of messages and overhead bits required for beam management while maintaining all necessary functionality.
Solution Approach 2:
The beam report message is designed to serve multiple purposes simultaneously: it provides beam measurement results, recommends precoding matrices, and enables beam indication. This multi-functional approach eliminates the need for separate dedicated messages for each function, thereby reducing overall signaling overhead while maintaining comprehensive beam management capability.
2Measurement precision
If beam measurement and reporting procedures are performed, then optimal beam pairs can be identified, but communication overhead increases
Solution Approach 1:
The patent extracts only the essential information needed for beam management from the complete beam measurement data. Instead of reporting all possible beam measurements, the system identifies and reports only the top candidate beams and their corresponding PMI recommendations, reducing overhead while preserving measurement precision for the most relevant beams.
Solution Approach 2:
The patent changes the reporting parameters by introducing a compact beam measurement report format that uses differential encoding and compressed representations of beam information. This parameter optimization reduces the bit overhead required to convey the same measurement precision, allowing accurate beam identification with reduced communication overhead.
3Productivity
If data transmission is scheduled on symbols carrying beam management reference signals, then resource utilization improves, but data transmission may fail due to beam changes
Solution Approach 1:
The patent performs beam measurement and selection using beam management reference signals before scheduling data transmission on the same resources. By completing beam management procedures in advance and confirming beam stability, the system ensures that data transmission occurs on reliable beam pairs, preventing transmission failures while maintaining high resource utilization.
Solution Approach 2:
The patent implements a feedback mechanism where the UE reports beam measurement results and beam stability indicators to the TRP. Based on this feedback, the TRP makes informed decisions about whether to schedule data transmission on symbols carrying beam management reference signals, thereby balancing resource utilization with transmission reliability through continuous monitoring and adaptation.
Data Source
AI summary
Embodiments of the present disclosure describe apparatuses, methods and machine-readable storage medium for beam reporting, beam indication and scheduling of data transmission during beam management.