Terminal TCI State Configuration for Radio Link Monitoring
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Solution Overview
Problem
In future radio communication systems, such as New Radio (NR), the relationship between the transmission configuration indication (TCI) state of specific channels/reference signals and unified TCI states for radio link monitoring, beam failure detection, and new beam detection is unclear, leading to potential degradation in communication quality and throughput.
Innovation Solution
A terminal equipped with a receiving section to receive configurations for multiple cells and a control section to apply TCI states to each cell, enabling appropriate recognition of TCI states for both downlink and uplink channels/signals, including specific channels for radio link monitoring, beam failure detection, and new beam detection, using a unified TCI framework.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a unified TCI state is applied to multiple types of channels/reference signals, then device complexity is reduced, but the relationship between TCI state and specific channels/RS for radio link monitoring, beam failure detection, and new beam detection becomes unclear
Solution Approach 1:
The patent segments the TCI state application by introducing a flag that divides TCI states into two categories: those applicable to both downlink and uplink channels, and those applicable only to specific channels/RS. This segmentation clarifies the relationship between TCI states and specific channels while maintaining unified state management, preventing information loss about TCI state applicability rules.
Solution Approach 2:
The patent applies local quality by making the TCI state applicability characteristic vary based on the specific channel or reference signal type. Different TCI states have different applicability qualities (both DL/UL or DL/UL only), allowing precise control over which channels/RS each TCI state governs while maintaining overall system simplicity.
2Ease of operation
If TCI state applicability is not clearly defined for specific channels, then ease of operation is improved, but communication quality and throughput degrade
Solution Approach 1:
The patent implements feedback mechanisms where the terminal explicitly reports the determined TCI state applicability to the base station. This feedback loop ensures that the base station receives accurate information about which TCI states apply to which channels/RS, enabling proper communication quality maintenance while keeping the configuration process simple for the terminal.
Solution Approach 2:
The patent applies preliminary action by having the terminal determine and report TCI state applicability information in advance before actual communication occurs. This preliminary determination of which TCI states apply to which channels/RS prevents communication quality degradation by ensuring proper TCI state selection is established before data transmission begins.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes: a receiving section that receives a plurality of configurations corresponding to a plurality of respective cells; and a control section that applies, to each of the cells, a transmission configuration indication (TCI) state indicated in a corresponding one of the configurations. Each of the configurations includes at least one of whether the TCI state corresponding to the configuration is applied to both downlink and uplink and whether the TCI state corresponding to the configuration is applied to a plurality of types of at least one of channels and signals. According to one aspect of the present disclosure, it is possible to appropriately recognize a relationship of a TCI state of a specific channel/RS, an RS for at least one of radio link monitoring, beam failure detection, and new beam identification, and a unified TCI state.