Terminal CSI Reporting for Non-Serving Cells
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Solution Overview
Problem
Current Next-Generation Radio (NR) specifications inadequately address Channel State Information (CSI) reporting for non-serving cells, leading to inefficient beam management and increased latency in inter-cell mobility scenarios.
Innovation Solution
A terminal equipped with a receiving section for CSI report configurations, including configurations for both serving and non-serving cells, and a control section that manages the transmission of CSI reports based on these configurations, utilizing Layer 3 Reference Signal Received Power (L3-RSRP) to facilitate appropriate CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If L1/L2 inter-cell mobility is implemented without handover to reduce latency, then mobility efficiency is improved, but CSI reporting for non-serving cells becomes insufficient leading to beam management degradation
Solution Approach 1:
The base station configures CSI report configurations for non-serving cells in advance, enabling the terminal to perform CSI measurements and reporting for non-serving cells before handover occurs. This preliminary configuration ensures that beam management information is available without requiring traditional handover procedures, thus reducing latency while maintaining reliable CSI reporting.
Solution Approach 2:
The patent introduces an intermediary mechanism where the base station provides reference signal configurations (such as SSB or CSI-RS) for non-serving cells to the terminal. This intermediary configuration enables the terminal to measure and report CSI for non-serving cells without establishing full connectivity, bridging the gap between fast mobility and reliable beam management.
2Reliability
If RRC reconfiguration is performed for handover to ensure reliable connection, then connection reliability is improved, but data incommunicable period increases reducing productivity
Solution Approach 1:
The base station performs preliminary configuration of CSI report settings for non-serving cells before handover is triggered. This advance configuration ensures that when handover occurs, the terminal already has the necessary measurement configurations in place, eliminating the need for RRC reconfiguration during handover and preventing data communication interruptions.
3Stability of the object's composition
If traditional handover procedures are used to manage cell transitions, then connection stability is improved, but beam management efficiency deteriorates due to increased overhead
Solution Approach 1:
The patent extracts the essential beam management functionality from the traditional handover procedure by enabling independent CSI reporting for non-serving cells. This separation allows beam management to occur independently of full handover execution, reducing the overhead and complexity associated with traditional handover while maintaining connection stability through selective beam switching.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives one or more channel state information (CSI) report configurations including a configuration of a reference signal of a serving cell and a configuration of a reference signal of a non-serving cell; and a control section that controls transmission of a CSI report including a reference signal received power in layer 3 (L3-RSRP), based on the one or more CSI report configurations. According to one aspect of the present disclosure, appropriate CSI reporting for a non-serving cell can be performed.