Terminal Aperiodic CSI Report Triggering for Inter-Cell Mobility
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Solution Overview
Problem
In next-generation mobile communication systems, efficient Layer-1/Layer-2 inter-cell mobility for DL/UL beam management is hindered by unclear triggers for aperiodic CSI reports, leading to reduced throughput and deteriorated communication quality, especially in scenarios involving non-serving cells and multi-TRP scenarios.
Innovation Solution
A terminal is equipped with a control section that determines the occurrence of events triggering aperiodic CSI reports based on channel state information measurements from serving, neighbor, primary, and secondary cells, and transmits these reports using a Medium Access Control Control Element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If L1/L2 inter-cell mobility with non-serving cell is employed, then beam management efficiency is improved, but aperiodic CSI report triggering becomes unclear
Solution Approach 1:
The patent segments the CSI report triggering mechanism by defining distinct event types (Event A1, A2, A3, A4, A5, A6) for different triggering scenarios. Each event has specific conditions based on serving cell and neighbor cell measurements, allowing the system to appropriately trigger aperiodic CSI reports in L1/L2 inter-cell mobility without requiring RRC reconfiguration.
2Reliability
If handover with RRC reconfiguration is used, then connection reliability is improved, but data communication unavailable period increases
Solution Approach 1:
The patent enables preliminary CSI measurements and reporting for neighbor cells before handover is actually executed. By configuring measurement objects and reporting configurations in advance, the terminal can prepare CSI information for potential target cells, allowing faster handover execution without RRC reconfiguration and minimizing data communication interruption.
3Device complexity
If aperiodic CSI report is not triggered appropriately, then device complexity is reduced, but throughput deteriorates
Solution Approach 1:
The patent implements feedback-based triggering mechanisms where the terminal monitors measurement results against configured thresholds and triggers aperiodic CSI reports when specific events occur. This feedback loop ensures CSI reports are generated only when necessary (when channel conditions change significantly), maintaining throughput while avoiding unnecessary reporting that would increase complexity.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a control section that determines whether an event to be a trigger of a CSI report occurs, based on a measurement result related to channel state information (CSI) of at least one of a serving cell, a neighbour cell, a primary cell, a primary secondary cell, and a secondary cell; and a transmitting section that transmits an aperiodic CSI report when the event occurs. According to one aspect of the present disclosure, an aperiodic CSI report can be appropriately performed.