Unified TCI State Update for Multi-Cell Groups
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Solution Overview
Problem
Current wireless communication technologies face challenges in configuring and updating transmission configuration indication (TCI) states for a group of cells, particularly in determining cell lists, TCI states without configured pools, and managing power control parameters across different numerologies and carrier aggregations.
Innovation Solution
The method involves receiving configuration of CC lists, determining a common TCI state for all cells in a list based on a reference subcarrier spacing, and applying this state to all cells after a specified application time, with mechanisms for joint and separate DL/UL TCI updates, and power control parameter updates for PUSCH and PUCCH transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual TCI state update is performed for each cell, then TCI state accuracy is maintained, but signaling overhead and update complexity increase
Solution Approach 1:
The patent combines multiple individual TCI state updates into a single group-based update mechanism. Cells are organized into cell groups, and a single MAC CE can update TCI states for all cells in a group simultaneously, reducing signaling overhead while maintaining state accuracy through the unified update approach.
Solution Approach 2:
The invention creates a universal TCI state update mechanism that can apply to multiple cells simultaneously. The group-based update structure allows a single update command to serve multiple cells, making the system more efficient without sacrificing the ability to maintain accurate TCI states for each individual cell.
2Device complexity
If simultaneous TCI state update is applied to all cells in a CC list, then signaling overhead is reduced, but difficulty in determining application time increases due to different numerologies
Solution Approach 1:
The patent introduces a reference cell as an intermediary to resolve the application time determination problem. The reference cell's numerology serves as a common reference point for all cells in the group, allowing simultaneous updates to be coordinated across cells with different numerologies by using the reference cell's timing as the basis for application time calculation.
Solution Approach 2:
The invention changes the parameter used for application time determination from individual cell-specific numerologies to a unified reference numerology derived from the reference cell. This parameter change enables consistent timing across diverse numerologies while maintaining the benefits of simultaneous updates.
3Productivity
If cell groups are configured for simultaneous TCI update, then update efficiency improves, but device configuration complexity increases
Solution Approach 1:
The patent segments the set of all cells into multiple cell groups, where each group can be independently configured and updated. This segmentation allows the system to achieve efficient simultaneous updates within groups while keeping the configuration manageable by dividing the overall cell set into smaller, more manageable units.
Solution Approach 2:
The invention applies partial action by allowing simultaneous updates to occur at the cell group level rather than requiring all cells to be updated together. This partial approach balances efficiency gains from simultaneous updates with the practical constraints of configuration complexity, enabling updates to proceed in manageable batches.
Data Source
AI summary
Methods and apparatuses for simultaneous unified TCI state update for a group of cells are disclosed. A method comprises receiving a configuration of one or more CC lists, simultaneous TCI state update is supported for all CCs in each CC list; receiving, for a CC list, an indication of common TCI state in one CC in the CC list to update TCI states of all CCs in the CC list, wherein, TCI state ID(s) are included in the indication of common TCI state; determining, for the CC list, application time of the common TCI state, the application time is based on a reference SCS; and applying the TCI state ID(s) included in the indication of common TCI state to all of CCs in the CC list after the determined application time.