Repeater Beam Management Using CSI-RS Mapping and gNB Control

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Solution Overview

Problem

Legacy NR beam management procedures are inadequate for network-controlled repeaters, as they cannot generate their own reference signals and lack awareness of beam configurations for DL/UL signals and channels, leading to inefficient wireless transmissions.

Innovation Solution

Developed procedures for beam management in network-controlled repeaters, including mapping CSI-RSs from the gNB-repeater link to actual beams on the repeater-UE link, providing signaling for time domain location of CSI-RSs, and informing the repeater of beam configurations and channel symbols, with reduced signaling overhead.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If legacy NR beam management procedures are used in network-controlled repeaters, then the repeater structure is simple and cost is reduced, but beam training efficiency deteriorates and transmission reliability worsens due to inability to generate reference signals and lack of beam configuration awareness

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidrepeater complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces a gNB as an intermediary that generates reference signals and determines beam configurations, which then control the repeater's beamforming operations. This mediator approach allows the simple repeater structure to achieve reliable beam management by relying on the gNB's intelligent control, resolving the contradiction between simplicity and reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The repeater performs self-service by applying beamforming based on received indications from the gNB. The repeater autonomously configures its beams according to the provided reference signal mappings and beam configuration parameters, enabling reliable operation without requiring complex internal decision-making capabilities.

Inventive Principle:

Principle #25Self-service

2Measurement precision

If detailed beam configuration signaling is provided to the repeater, then beam training precision is improved, but signaling overhead increases

Engineering Contradiction:

Improvebeam training precisionVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent uses copying by having the repeater reuse the same reference signal resources and beam configurations that are already established for direct gNB-UE communication. The repeater copies the beamforming parameters and reference signal mappings from the gNB, achieving precise beam training without requiring separate dedicated signaling for the repeater link.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The reference signals and beam configurations provided to the repeater serve multiple functions: they enable both the direct gNB-UE link and the indirect gNB-repeater-UE link to operate with precise beamforming. This universal approach allows the same signaling to support multiple transmission paths, reducing overall signaling overhead while maintaining precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260019135A1Information sharing for beam management in repeater

Publication Date: 2026.01.15 SAMSUNG ELECTRONICS CO LTD

AI summary

Disclosed is a method of determining an access link beam by a repeater, including receiving, from a base station, an indication of beam indices including an indicated beam and a corresponding time to apply the indicated beam and transmitting at least one resource set using the indicated beam.