Inter-Cell Beam Management for Clear CORESET TCI Handling
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Solution Overview
Problem
In 5G New Radio (NR), there is ambiguity in the TCI state/QCL assumption for common control resource sets (CSS) during inter-cell beam management, leading to unclear beam indications and potential issues in monitoring downlink control information, especially when a user equipment (UE) communicates with cells having different physical cell identities (PCIs) from the serving cell.
Innovation Solution
The proposed solution involves configuring a user equipment (UE) to support multiple control resource sets (CORESETs) for a serving cell, allowing it to receive and apply TCI state indications specifically for UE-specific and common search spaces, while ignoring or applying default states based on cell identities, thereby resolving ambiguity and ensuring proper beam management without significant signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TCI state indication for a cell other than the serving cell is applied to all control resource sets, then inter-cell beam management capability is improved, but ambiguity in TCI state and QCL assumption for common control resource sets occurs
Solution Approach 1:
The patent segments control resource sets into two categories: common control resource sets (CSS) and apparatus-specific control resource sets (USS). For CSS, the apparatus follows the serving cell's TCI state indication, while for USS, it applies the TCI state indication of the indicated cell. This segmentation resolves the ambiguity by assigning different TCI state application rules to different types of control resource sets.
Solution Approach 2:
The patent applies different quality rules locally to different control resource sets. Specifically, CSS maintains the property of following serving cell TCI state indications, while USS adopts the property of applying indicated cell TCI state indications. This local differentiation allows inter-cell beam management for USS while preserving serving cell beam consistency for CSS.
2Loss of information
If different TCI state indication rules are applied to different control resource sets, then TCI state ambiguity is resolved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic behavior where the apparatus determines the type of control resource set (CSS or USS) and dynamically applies the appropriate TCI state indication rule. This dynamic adaptation allows the system to handle different control resource sets with different rules without requiring separate static configurations for each case, thereby managing complexity through adaptive logic.
Data Source
AI summary
Various example embodiments relate to apparatuses and methods for inter-cell beam management. An apparatus may be configured to support a first control resource set and a second control resource set for a serving cell, receive a transmission configuration indicator state indication for the first control resource set for a cell other than the serving cell, and ignore, for the second control resource set, the received transmission configuration indicator state indication when the second control resource set is configured to follow a transmission configuration indicator state indication for the serving cell.