Inter-Cell Mobility C-RNTI Selection for Fast NR Switching
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Solution Overview
Problem
In future radio communication systems like NR, layer 1/layer 2 inter-cell mobility faces challenges with efficient DL/UL beam management due to the need for radio resource control reconfiguration during handover, leading to latency and overhead issues, and the reuse of cell radio network temporary identifiers (C-RNTIs) across cells causing erroneous data reception.
Innovation Solution
A terminal and base station are designed to transmit capability information for RRC parameter updates between serving and non-serving cells, allowing for the selection of distinct C-RNTIs to prevent erroneous data reception during inter-cell mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If L1/L2 inter-cell mobility is implemented without handover, then latency is reduced and data communication continuity is improved, but C-RNTI collision occurs causing erroneous data reception
Solution Approach 1:
The patent segments the C-RNTI identification into two parts: the original C-RNTI for serving cell communication and a new C-RNTI for non-serving cell communication. This segmentation allows the terminal to maintain separate identifiers for different cells, preventing collision while enabling fast switching without full handover procedures.
Solution Approach 2:
The patent introduces a new C-RNTI as an intermediary identifier for non-serving cells. This intermediary element allows the terminal to distinguish between serving and non-serving cells, enabling proper data routing and reception without confusion between different cells' control information.
2Reliability
If handover is performed for cell switching, then C-RNTI collision is avoided, but data communication interruption occurs due to RRC reconfiguration
Solution Approach 1:
The patent prepares multiple C-RNTIs in advance for different cells before actual cell switching occurs. The terminal stores capability information indicating support for L1/L2 mobility, and pre-configures separate C-RNTIs for serving and non-serving cells, enabling immediate switching without waiting for RRC reconfiguration completion.
Solution Approach 2:
The patent implements dynamic C-RNTI selection based on the current cell state. The terminal dynamically switches between using the serving cell C-RNTI and the non-serving cell C-RNTI depending on whether the cell is currently active or not, enabling flexible and adaptive cell management without fixed handover procedures.
3Productivity
If the same C-RNTI is reused across cells, then resource efficiency is improved, but erroneous reading of downlink control information occurs
Solution Approach 1:
The patent applies local quality by assigning different C-RNTIs to different cells based on their specific requirements. Each cell receives a dedicated C-RNTI that is locally optimized for that cell's communication needs, preventing misinterpretation of control information while maintaining overall system efficiency through targeted identifier allocation.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a transmitting section that transmits capability information indicating support of update of at least part of radio resource control (RRC) parameters between a serving cell and a non-serving cell; and a control section that assumes, when the capability information is transmitted, different cell radio network identifiers (C-RNTIs) in the serving cell and the non-serving cell. According to one aspect of the present disclosure, a C-RNTI can be appropriately selected.