Inter-Frequency CSI Reporting for L1/L2 Mobility Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for improved inter-frequency channel state information (CSI) reporting in wireless communication systems, particularly in 5G NR, to enhance mobility and beam management between cells.
Innovation Solution
A method and apparatus for performing synchronization signal block (SSB)-based or channel state information reference signal (CSI-RS)-based inter-frequency measurements for non-serving cells, enabling the transmission of CSI reports to network entities or reception of CSI reports from user equipment (UE) based on measurements of SSBs or CSI-RSs on different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-frequency CSI reporting is implemented for mobility management, then beam management and cell switching capability is improved, but device complexity and processing overhead increases
Solution Approach 1:
The network entity pre-configures the UE with measurement parameters, resource configurations, and reporting formats before inter-frequency measurements are performed. This preliminary configuration reduces real-time processing complexity by having the UE ready with measurement guidelines and reporting templates, allowing faster adaptation to different frequencies without increasing device complexity during actual mobility operations
Solution Approach 2:
The inter-frequency CSI reporting process is divided into separate configurable components: measurement configuration, resource allocation, reporting format selection, and triggering mechanisms. This segmentation allows the system to enable only necessary functions for specific scenarios, improving beam management capability while keeping processing overhead manageable through selective activation of reporting features
2Reliability
If measurement configurations are provided for non-serving cells, then mobility between cells is improved, but loss of time for measurement and reporting increases
Solution Approach 1:
The system implements periodic CSI reporting where the UE transmits channel state information at regular intervals configured by the network entity. This periodic mechanism ensures continuous mobility management information is available for handover decisions while allowing the UE to batch measurements and reports, reducing the time loss compared to continuous real-time reporting
Solution Approach 2:
The network entity can dynamically adjust measurement parameters such as measurement frequency, reporting interval, and resource allocation based on UE mobility state and channel conditions. For stationary or slow-moving UEs, measurements are performed less frequently, reducing time loss while maintaining reliable mobility management. For fast-moving UEs, the system increases measurement frequency to maintain connection reliability
Data Source
AI summary
Aspects presented herein may enable a UE to perform inter-frequency L1 measurement for one or more neighboring (e.g., non-serving) cells, and to report L1 CSI report for L1/L2 mobility. In one aspect, a UE receives a configuration to perform an SSB-based inter-frequency measurement or a CSI-RS-based inter-frequency measurement for a non-serving cell, where the configuration is received from a network entity. The UE measures a set of SSBs or a set of CSI-RSs transmitted from the non-serving cell based on the configuration, where the set of SSBs or the set of CSI-RSs corresponds to a different frequency than an SSB or a CSI-RS of a serving cell. The UE transmits a CSI report associated with the non-serving cell to the network entity, where the CSI report is transmitted based on the measurement of the set of SSBs or the set of CSI-RSs.