NCR Beam Feedback for Control-Link Interference Avoidance
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Solution Overview
Problem
In wireless communication systems, the introduction of network-controlled repeaters (NCR) leads to interference between downlink reception and transmission beams, degrading the downlink reception performance in the control link of the NCR-MT.
Innovation Solution
A method is provided for a network-controlled repeater (NCR) that includes an NCR-MT performing measurements and transmitting feedback information to a base station, specifically interference information for downlink reception and transmission beams, allowing the network to adjust beam directions to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the NCR-Fwd transmits downlink signals to UEs using access link beams, then the coverage and service capability are improved, but the downlink reception performance of NCR-MT in the control link is degraded due to interference
Solution Approach 1:
The NCR-MT measures interference from access link downlink transmission beams on control link downlink reception beams and feeds back interference information (including interference values and beam pair identifiers) to the base station. This feedback mechanism enables the base station to identify and avoid harmful beam combinations, resolving the contradiction between maintaining service capability and preventing interference degradation.
Solution Approach 2:
The system dynamically adjusts beam directions based on measured interference conditions. The NCR-MT measures interference for multiple beam pairs and reports the harmful combinations to the base station, which then dynamically selects or adjusts beam directions to avoid interference while maintaining service coverage. This dynamic adaptation allows the system to optimize both service capability and reception performance under varying conditions.
2Reliability
If the NCR-MT performs measurements and transmits feedback information to manage beam directions, then the downlink reception performance is improved, but the device complexity and signaling overhead increase
Solution Approach 1:
Instead of measuring and reporting all possible beam pairs, the NCR-MT measures interference for a configured set of beam pairs (including both control link reception beams and access link transmission beams) and reports only the harmful combinations that exceed interference thresholds. This partial action approach reduces measurement and feedback complexity while still effectively identifying and avoiding harmful beam directions.
3Reliability
If the base station adjusts beam directions based on interference feedback, then the interference is reduced and reception performance is improved, but the network control complexity increases
Solution Approach 1:
The NCR-MT autonomously measures interference from access link beams on control link receptions and generates feedback information identifying harmful beam pairs. This self-service measurement and reporting reduces the need for extensive network-controlled measurements and adjustments, thereby reducing network control complexity while still achieving interference mitigation and performance improvement.
Data Source
AI summary
An operation method of a device in a wireless communication system and a device using the method are provided. The method may be performed by an NCR including NCR-MT and NCR-Fwd. The NCR-MT performs measurement, and the NCR-MT transmits feedback information based on a result of the measurement to a base station. The feedback information includes interference information on a pair of a downlink reception beam in a control link through which the NCR-MT receives control information from the base station and a downlink transmission beam in an access link through which the NCR-Fwd transmits a signal to a terminal.