CSI Measurement Configuration for Low-Latency Inter-Cell Mobility
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Solution Overview
Problem
Current CSI measurement configurations for UE are limited to serving cells and do not support L1/L2 inter-cell mobility, leading to longer latency and overhead during cell changes, as they do not allow measurements on cells outside the serving cell group.
Innovation Solution
The UE performs CSI measurements on target L1/L2 inter-cell mobility candidate cells based on configurations generated by a candidate DU, including beam and frequency information, reducing the need for explicit CSI resource configurations by the candidate DU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If CSI measurements are configured only for serving cells, then the measurement configuration is simple and manageable, but inter-cell mobility latency and overhead increase due to inability to perform measurements on candidate cells
Solution Approach 1:
The network configures the UE with target cell configurations (including SSB frequencies and other cell parameters) in advance before mobility is needed. This preliminary configuration enables the UE to immediately perform CSI measurements on candidate cells when mobility is triggered, eliminating the need for configuration delays during actual cell transitions.
Solution Approach 2:
The target cell configuration is designed to be multi-functional: it serves both as a future serving cell configuration (when mobility occurs) and as a basis for current CSI measurements on candidate cells. This universal configuration structure eliminates the need for separate measurement-specific configurations, reducing overall system complexity while enabling fast mobility.
2Measurement precision
If explicit CSI resource configurations are provided for each candidate cell, then measurement precision is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts only the essential configuration elements needed for CSI measurements (such as SSB frequencies and basic cell parameters) from the full serving cell configuration. By taking out only these critical measurement-related parameters and providing them in the target cell configuration, the system achieves sufficient measurement precision without the burden of complete explicit CSI resource configurations for each candidate cell.
3Adaptability or versatility
If the UE performs measurements on all possible cells, then mobility options are maximized, but the number of unnecessary measurements and overhead increase
Solution Approach 1:
Instead of uniformly configuring all candidate cells with full measurement parameters, the patent applies local quality by providing target cell configurations selectively and specifically for cells where measurements are actually needed. The configuration includes cell-specific parameters (like SSB frequencies) only for relevant target cells, allowing the UE to focus measurements on high-priority candidates while avoiding unnecessary measurements on distant or low-probability cells.
Data Source
AI summary
According to some embodiments, a method is performed by a wireless device for performing channel state information (CSI) measurements for layer one (L1)/layer two (L2) inter-cell mobility. The method comprises receiving a message from a network node. The message comprises at least one configuration of a target L1/L2 inter-cell mobility candidate cell. The method further comprises: performing CSI measurements on at least one of a synchronization signal (SS) and a reference signal (RS) of the target L1/L2 inter-cell mobility candidate cell based on the at least one configuration of the target L1/L2 inter-cell mobility candidate cell and transmitting a CSI report including information based on the CSI measurements to the network node.