User Terminal Beam Measurement Control for 5G Mobility
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Solution Overview
Problem
Future radio communication systems, such as 5G and NR, face challenges in maintaining mobility when using multiple beams or transmission reception points, as legacy measurement reporting methods increase the measurement load and lower mobility.
Innovation Solution
A user terminal is equipped with a reception section to receive measurement signals with different resource configurations, a control section to control measurement based on downlink L1/L2 signaling or predetermined conditions, and a transmission section to report measurement results, allowing for dynamic switching of CSI measurement reporting targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy measurement reporting method is used for controlling multiple beams or transmission reception points, then the system can maintain basic mobility functionality, but the measurement load of the UE increases and mobility performance deteriorates
Solution Approach 1:
The measurement reporting is segmented into two distinct types: beam-level measurement reporting (using L1/L2 signaling) and cell-level measurement reporting (using L3 signaling). This segmentation allows the system to separately handle beam management and mobility management, reducing the overall measurement load while maintaining mobility performance. The UE performs beam measurements and reports only when beam switching is needed, rather than continuously reporting all measurements as in legacy methods.
Solution Approach 2:
The patent implements dynamic switching between beam-level and cell-level measurement reporting based on system conditions. The base station can dynamically configure the UE to perform beam-level reporting when beam management is needed, and cell-level reporting when mobility management is needed. This dynamic approach optimizes the measurement load according to actual network conditions while maintaining reliable mobility performance.
2Productivity
If multiple beams or transmission reception points are configured, then the system can provide higher data rates and better coverage, but the measurement load of the UE increases significantly
Solution Approach 1:
The patent extracts beam-level measurement reporting from the traditional cell-level measurement reporting framework. By separating beam measurements (L1/L2) from cell measurements (L3), the system can configure multiple beams and transmission reception points to achieve higher data rates and better coverage, while the UE only performs detailed beam measurements when actually needed for beam switching, significantly reducing the overall measurement load compared to continuous beam monitoring in legacy systems.
3Reliability
If continuous beam measurement and reporting is performed, then the system can maintain optimal beam selection, but the feedback overhead increases
Solution Approach 1:
The patent implements periodic beam-level measurement reporting at the L1/L2 level, where the UE reports beam measurements only at specific periods or events (such as when beam quality changes exceed a threshold or when beam switching is triggered). This periodic action maintains optimal beam selection accuracy by ensuring timely beam measurements are reported, while significantly reducing feedback overhead compared to continuous beam reporting, as the UE only transmits beam measurement information when actually needed for beam management decisions.
Data Source
AI summary
Even when multiple beams or transmission reception points are used, mobility is prevented from lowering. A user terminal according to one aspect of the present invention includes: a reception section that receives a plurality of measurement signals employing respectively different measurement resource configurations; a control section that controls measurement out of a measurement signal of the plurality of measurement signals corresponding to resource configuration information included in downlink L1/L2 signaling or selected based on a predetermined condition; and a transmission section that reports a measurement result.