Beam Information Reporting for Multi-User MIMO Interference Management

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently reporting beam information for multi-user MIMO transmission, particularly in identifying the best and worst transmission beams, which affects interference management and scheduling in multi-user environments.

Innovation Solution

A method and apparatus where User Equipment (UE) receives beam measurement reference signals from a base station, determines the best and worst transmission beams, and reports this information to the base station, allowing for improved beam management and interference minimization in multi-user MIMO scenarios.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If beam measurement reference signals are transmitted for multiple candidate transmission beams, then beam selection accuracy is improved, but signaling overhead and measurement complexity increase

Engineering Contradiction:

Improvebeam selection accuracyVSAvoidmeasurement complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the essential beam information (best beam index and worst beam index) from the complete beam measurement results. Instead of reporting all beam measurement data, the system selectively extracts the most critical information needed for MU-MIMO scheduling, thereby reducing measurement and reporting complexity while maintaining beam selection accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent uses reference signals (CSI-RS or SSB) as simplified copies or representations of the actual transmission beams. These reference signals contain the essential characteristics needed for beam measurement and selection, allowing the UE to perform accurate beam measurements without processing complete beam data, thus reducing measurement complexity.

Inventive Principle:

Principle #26Copying

2Reliability

If information on both best and worst transmission beams is reported, then interference management capability is improved, but uplink signaling overhead increases

Engineering Contradiction:

Improveinterference management capabilityVSAvoiduplink signaling overhead

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts only the critical beam information (best beam index and worst beam index) from the complete beam measurement results. Instead of reporting all beam measurement data, the system selectively extracts the most critical information needed for MU-MIMO scheduling, thereby reducing measurement and reporting complexity while maintaining beam selection accuracy.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent reports only the necessary portion of beam information (best and worst beam indices) rather than complete beam measurement data for all candidate beams. This partial reporting approach provides sufficient information for interference management in MU-MIMO while significantly reducing uplink signaling overhead compared to reporting all beam data.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If multiple candidate transmission beams are evaluated, then scheduling flexibility is improved, but processing time and complexity increase

Engineering Contradiction:

Improvescheduling flexibilityVSAvoidprocessing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent performs preliminary beam measurements and evaluations by the UE before scheduling decisions are made. The UE pre-identifies the best and worst beams from multiple candidate beams using reference signals, so that when scheduling is needed, the base station already has pre-processed beam information ready, reducing real-time processing time while maintaining scheduling flexibility.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS10924956B2Beam information reporting method for multi-user MIMO transmission in wireless communication system and apparatus therefor

Publication Date: 2021.02.16 LG ELECTRONICS INC

AI summary

Disclosed is a method by which a terminal reports beam information to a base station in a wireless communication system. The method comprises the steps of: receiving, from the base station, a beam measurement reference signal corresponding to each of a plurality of candidate transmission beams; determining at least one best transmission beam among the plurality of candidate transmission beams on the basis of the beam measurement reference signal; determining at least one worst transmission beam corresponding to each of the at least one best transmission beam among the plurality of candidate transmission beams by using a best reception beam corresponding to the at least one best transmission beam among candidate reception beams; reporting, to the base station, information on the at least one best transmission beam and the at least one worst transmission beam corresponding to the at least one best transmission beam.