TCI State Switching for Faster Multi-TRP Cell Handover
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Solution Overview
Problem
The challenge of indicating a suitable TCI state for a target cell during layer 1/layer 2 triggered mobility (LTM) in Release 18 (Rel-18) has not been adequately addressed, leading to increased handover interruption times in 5G NR systems with multiple transmission and reception points (mTRP).
Innovation Solution
A method and apparatus for a terminal equipment to receive multiple layers of indication information to quickly apply a suitable TCI state after cell switch, including first, second, third, fourth, fifth, sixth, and seventh indication information to facilitate seamless TCI state transition to a target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple layers of indication information are received to quickly apply TCI state after cell switch, then handover interruption time is reduced, but device complexity increases
Solution Approach 1:
The terminal equipment receives and processes multiple layers of indication information (first, second, third, fourth, fifth, sixth, and seventh indication information) in advance to determine the appropriate TCI state before completing the cell switch. This preliminary configuration allows the terminal to quickly apply the correct TCI state immediately after cell switch, minimizing handover interruption time while managing device complexity through structured information processing
Solution Approach 2:
The indication information is segmented into multiple distinct layers (first through seventh indication information), each carrying specific configuration parameters for TCI state determination. This segmentation allows the terminal equipment to process different aspects of TCI configuration separately and systematically, enabling rapid TCI state application after cell switch while maintaining manageable device complexity through organized information handling
2Productivity
If TCI state is quickly applied after cell switch, then handover efficiency is improved, but indication information processing complexity increases
Solution Approach 1:
The terminal equipment receives multiple layers of indication information containing TCI state configurations before the cell switch is completed. This preliminary reception and processing of indication information (first through seventh layers) enables the terminal to determine the appropriate TCI state in advance, improving handover efficiency by eliminating post-switch configuration delays while managing processing complexity through structured information organization
Solution Approach 2:
The indication information is divided into seven distinct layers, each carrying specific configuration parameters. This segmentation allows the terminal equipment to process different indication information layers systematically and separately, improving handover efficiency through organized information handling while keeping processing complexity manageable by breaking down the overall processing task into smaller, structured components
Data Source
AI summary
A data reception apparatus, configured in a terminal equipment, includes: a receiver configured to: receive first indication information, the first indication information indicating a transmission configuration indication (TCI) state set for each candidate cell and including information of a unified TCI state type (unified TCI-StateType) for each candidate cell, receive second indication information, the second indication information indicating that the terminal equipment is switched to a target cell which is one of at least one candidate cell configured for the terminal equipment, and receive third indication information, the third indication information indicating a transmission configuration indication (TCI) state that is applied to a first bandwidth part (BWP) of the target cell from the transmission configuration indication (TCI) state set of the target cell and processor circuitry configured to perform a process to switch to the target cell according to the second indication information.