Terminal TCI State Management for Inter-Cell Mobility
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Solution Overview
Problem
In future radio communication systems, controlling the reception of information signals across multiple transmission/reception points during inter-cell mobility poses challenges, particularly in managing transmission configuration indications and quasi-co-location assumptions.
Innovation Solution
A terminal equipped with a receiving section to monitor activation of transmission configuration indication states and a control section to manage downlink control channels for paging, based on whether the serving cell's TCI state is included in the activated TCI state, ensuring appropriate communication even during inter-cell mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inter-cell mobility is performed using a plurality of transmission/reception points, then communication capacity and speed are improved, but control of reception of information signals and management of TCI states become complex and difficult
Solution Approach 1:
The patent segments the TCI state management by separating serving cell TCI states from non-serving cell TCI states. The terminal device selectively applies TCI states based on whether they correspond to serving cells or non-serving cells, dividing the complex multi-TRP reception control into manageable subsets that can be handled independently.
Solution Approach 2:
The patent applies preliminary action by pre-configuring TCI states for both serving cells and non-serving cells before inter-cell mobility occurs. The terminal device receives and stores TCI state information in advance, allowing it to quickly and automatically select the appropriate TCI state when mobility events occur, without requiring complex real-time decision-making.
2Reliability
If TCI states from multiple cells are activated for inter-cell mobility, then communication reliability is improved, but determining which TCI state to use for paging reception becomes difficult
Solution Approach 1:
The patent applies local quality by making the TCI state selection specific to the function being performed. For paging reception, the terminal selectively uses TCI states corresponding to serving cells, while for other data transmissions it may use TCI states from non-serving cells. This localized approach to TCI state selection simplifies the decision-making process for each specific communication function.
Solution Approach 2:
The patent inverts the conventional approach by not requiring the terminal to select from all activated TCI states, but rather to exclude certain TCI states (those corresponding to non-serving cells) for specific functions like paging. This inversion simplifies the selection process by reducing the candidate set rather than expanding it.
3Reliability
If the terminal monitors all activated TCI states, then no paging signals are missed, but power consumption and processing load increase
Solution Approach 1:
The patent extracts only the necessary TCI states (those corresponding to serving cells) for paging reception, excluding TCI states from non-serving cells. This extraction approach allows the terminal to maintain reliable paging reception while significantly reducing the number of TCI states that need to be monitored, thereby lowering power consumption and processing requirements.
Solution Approach 2:
The patent applies partial action by monitoring only a subset of activated TCI states rather than all of them. For paging reception specifically, the terminal monitors only serving cell TCI states, which is sufficient for the function at hand. This partial monitoring approach reduces energy consumption while maintaining adequate reliability for paging operations.
Data Source
AI summary
Even when inter-cell mobility is performed using a plurality of transmission/reception points, communication is appropriately performed. A terminal according to one aspect of the present disclosure includes a receiving section that receives information related to activation of a transmission configuration indication (TCI) state, and a control section that controls monitoring of a downlink control channel related to paging, based on whether or not the TCI state corresponding to a serving cell is included in the TCI state to be activated.