Terminal Timing Advance Control During Inter-Cell Switching
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Solution Overview
Problem
In future radio communication systems, controlling uplink transmission timing advance during inter-cell mobility is challenging, particularly when switching between serving and candidate cells, leading to potential degradation of communication quality due to inappropriate timing advance control.
Innovation Solution
A terminal equipped with a receiving section for cell switch indication information and a control section that manages timing advance based on pre-received or post-received information, or timing advance of another cell, ensuring appropriate communication control even when a candidate cell is configured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-cell mobility with candidate cell configuration is implemented to enable flexible cell switching, then adaptability and mobility control capability are improved, but timing advance control reliability deteriorates when TA information is not included in cell switch indication
Solution Approach 1:
The terminal performs preliminary acquisition of timing advance information for candidate cells before actual cell switching occurs. The terminal receives and stores TA information for candidate cells in advance through downlink messages from the network, so that when cell switching is triggered, the terminal already has the necessary TA information ready to apply immediately, eliminating the reliability problem of missing TA information during switching.
Solution Approach 2:
The patent introduces an intermediary mechanism where the network provides timing advance information for candidate cells through downlink signaling messages. This intermediary information transfer channel ensures that the terminal receives TA information for candidate cells before switching, acting as a mediator that bridges the gap between cell switching commands and timing advance configuration.
2Reliability
If timing advance information is always included in cell switch indication, then timing advance control reliability is improved, but information transmission overhead and device complexity increase
Solution Approach 1:
Instead of including TA information in every cell switch indication, the system performs preliminary transmission of TA information for candidate cells through separate downlink messages before switching occurs. This preliminary action allows the switch indication to remain concise while ensuring TA information is already available at the terminal, reducing the complexity of the switching mechanism itself.
Solution Approach 2:
The terminal is configured to autonomously manage and store timing advance information for multiple candidate cells in advance. When a cell switch indication is received, the terminal automatically retrieves the appropriate pre-stored TA information without requiring it to be explicitly included in the switch command, reducing the processing complexity of the switch indication message while maintaining reliability.
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives cell switch indication information indicating switch to a target cell; and a control section that performs, when information about timing advance of the target cell is not included in the cell switch indication information, control to apply at least one of timing advance of the target cell acquired before reception of the cell switch indication information, timing advance acquired after the reception of the cell switch indication information, and timing advance of another cell different from the target cell.