CORESET-TRP Association via L1/L2 Signaling for Fast Beam Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing 5G NR technology faces reconfiguration latency issues due to the RRC-based association between control resource sets (CORESET) and transmission reception points (TRPs), which hampers efficient dynamic switching during L1/L2 based inter-cell mobility.
Innovation Solution
Dynamically updating the TRP index per CORESET using L1/L2 signaling to facilitate rapid association changes, allowing for beam switching without RRC reconfiguration latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC configured parameter (CORESETPoolindex) is used to associate CORESET with TRP, then the association is established, but RRC reconfiguration latency occurs
Solution Approach 1:
The patent applies dynamics by enabling the CORESET-TRP association to be dynamically updated through L1/L2 signaling (TCI states) rather than being static through RRC configuration. The TRP association can change rapidly based on mobility conditions without triggering RRC reconfiguration, making the system adaptable to changing channel conditions while avoiding the latency penalty of RRC reconfiguration.
Solution Approach 2:
The patent segments the association update process into two layers: RRC configuration provides the initial set of possible TRPs and CORESET parameters, while L1/L2 signaling (TCI states) handles the dynamic selection and switching among these pre-configured options. This segmentation allows fast switching at the L1/L2 layer without involving the slower RRC layer for every change.
2Speed
If L1/L2 beam switch signaling is used to dynamically update CORESET-TRP association, then beam switching speed improves, but signaling complexity increases
Solution Approach 1:
The patent applies preliminary action by having the RRC layer pre-configure the set of available TRPs and their associated parameters before dynamic switching is needed. When L1/L2 beam switching occurs, the UE only needs to select from these pre-configured options using TCI state indicators, rather than processing complete TRP configuration messages. This reduces the signaling overhead and complexity during dynamic switching.
3Manufacturing precision
If RRC reconfiguration is performed for TRP association updates, then configuration accuracy is maintained, but reconfiguration latency increases
Solution Approach 1:
The patent introduces TCI states as an intermediary mechanism between the RRC configuration layer and the physical layer TRP selection. The RRC layer configures a set of candidate TRPs and their parameters with high accuracy, then the TCI state mechanism mediates the selection and switching among these candidates. This intermediary allows fast switching without requiring repeated RRC reconfigurations, maintaining configuration accuracy while reducing latency.
Data Source
AI summary
In inter-cell mobility, the association between the CORESET and the TRP may be dynamically updated by L1/L2 beam switch signaling, which may cause RRC reconfiguration latency. To address the latency issue, a UE, in one aspect of the disclosure: (1) receives, from a cell, a configuration of a CORESET and a configuration of a set of TRPs; (2) receives, from the cell, an index indication of an index for the CORESET; and (3) determines, based on the index indication, a TRP in the set of TPRs to be associated with the CORESET.