Inter-cell Beam Measurement Reporting in 5G NR Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing inter-cell beam measurement and reporting, particularly in 5G/NR systems, which affect radio interface efficiency and coverage due to increasing wireless data traffic and the need for improved beamforming and capacity support.
Innovation Solution
The implementation of methods and apparatuses for inter-cell beam measurement and reporting, where user equipment (UE) and base stations (BS) exchange information related to channel state information reference signals (CSI-RS) and transmission configuration indications (TCI) to determine and report beam measurement metrics, enabling seamless beam switching and improved coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-cell beam measurement and reporting procedures are implemented in 5G/NR systems, then beamforming gain and capacity are improved, but system complexity and overhead increase
Solution Approach 1:
The patent applies universality by enabling the same beam measurement and reporting mechanisms to serve multiple purposes: intra-cell beam management, inter-cell beam management, handover preparation, and mobility optimization. The UE and network use unified procedures for measuring CSI-RS resources across different cells, reporting beam quality metrics, and managing TCI states, thereby reducing the need for separate specialized procedures and lowering overall system complexity while maintaining high capacity support
Solution Approach 2:
The patent segments the beam management process into distinct measurable components: CSI-RS resource measurement, beam quality metric calculation, TCI state association, and structured reporting. By dividing the complex inter-cell beam management into these manageable segments with standardized interfaces, the system can process beam measurements efficiently across multiple cells without overwhelming complexity, allowing scalable implementation that supports increased wireless capacity
2Measurement precision
If beam measurement accuracy is improved through detailed CSI-RS resource measurement, then beamforming precision increases, but measurement and reporting overhead increases
Solution Approach 1:
The patent implements partial action by having the UE measure and report only the most relevant beam parameters and quality metrics rather than complete channel state information for all CSI-RS resources. The UE identifies and reports on candidate beams exceeding quality thresholds, providing sufficient measurement precision for beamforming decisions while avoiding the overhead of reporting all possible beam parameters, thus balancing accuracy with reduced overhead
Solution Approach 2:
The patent changes reporting parameters dynamically based on channel conditions and beam quality. When beam conditions are stable, reporting frequency and detail are reduced. When handover or beam switching is detected, the system increases measurement and reporting activity. This adaptive parameter adjustment maintains high measurement precision when needed while minimizing overhead during stable conditions, directly addressing the contradiction between accuracy and overhead
3Loss of time
If handover latency is reduced through faster beam measurement, then system responsiveness improves, but measurement reliability may deteriorate
Solution Approach 1:
The patent applies preliminary action by having the UE continuously measure and maintain information about candidate beams and their quality metrics before handover is actually needed. The network configures CSI-RS resources in advance for potential target cells, and the UE performs background measurements and maintains beam candidate lists. When handover becomes necessary, this pre-collected measurement data can be immediately utilized, reducing handover latency while maintaining reliability through pre-validated measurements rather than rushed new measurements
Data Source
AI summary
A UE includes a transceiver configured to receive first information related to a group of CSI-RS resources, receive second information related to a group TCI states, receive third information indicating an association between the group of TCI states and the group of CSI-RS resources, receive fourth information indicating resources for transmission of a beam measurement report, receive a MAC CE including a cell switch command, and transmit a HARQ-ACK. The UE further includes a processor configured to determine one or more CSI-RS resources from the group of CSI-RS resources based on the TCI state. The transceiver is further configured to receive the one or more CSI-RS resources. The processor is further configured to determine, based on a measurement of the one or more CSI-RS resources, a beam measurement report. The transceiver is further configured to transmit the beam measurement report using the resources for transmission of a beam measurement report.