Wireless Terminal TCI Control for Multiple Uplink Transmissions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio communication systems face issues with indefinite methods for applying transmission configuration indication (TCI) states to multiple types of signals, leading to potential communication quality degradation and throughput reduction.
Innovation Solution
A terminal and base station that utilize a unified TCI state determination mechanism, based on downlink control information, transmission/reception point index, and control resource set pool index, to appropriately control communication for multiple types of signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unified TCI state is applied to multiple types of signals (channels/RSs), then communication quality and throughput are improved, but the method for applying the TCI state becomes indefinite and complex
Solution Approach 1:
The patent segments the TCI state application by introducing separate indication mechanisms for different signal types. Downlink control information (DCI) is used to indicate TCI states for downlink signals, while uplink control information (UCI) is used for uplink signals. This segmentation resolves the complexity by providing clear, type-specific application rules rather than a single indefinite method for all signal types.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a TCI state indication field within DCI structures. This intermediary explicitly maps TCI state identifiers to specific downlink signals (PDSCH, PDCCH), creating a deterministic application path that eliminates the previously indefinite nature of TCI state application across multiple signal types.
2Productivity
If a unified TCI state is applied to multiple types of signals (channels/RSs), then communication throughput is improved, but the indication method becomes indefinite
Solution Approach 1:
The patent segments the indication mechanism by signal type, using DCI for downlink TCI state indication and UCI for uplink TCI state indication. This segmentation prevents information loss by ensuring that each signal type has a dedicated, unambiguous indication path, eliminating the indefiniteness that would otherwise occur when trying to apply a single TCI state method to all signals.
Solution Approach 2:
The patent applies preliminary action by configuring TCI states in advance through higher-layer signaling (RRC or MAC CE) before they are activated. The TCI state indication field in DCI then simply points to pre-configured states, ensuring clear and unambiguous indication while maintaining high throughput through efficient reconfiguration capabilities.
3Adaptability or versatility
If multiple TCI states are supported for different signals, then communication control flexibility is improved, but the determination method becomes indefinite
Solution Approach 1:
The patent segments the TCI state determination process into distinct paths for different signal types and transmission directions. Downlink signals use DCI-based indication, while uplink signals use UCI-based indication. This segmentation maintains operational ease by providing simple, rule-based determination methods for each segment, rather than requiring complex judgment for unified TCI state application across all signals.
Solution Approach 2:
The patent applies local quality by allowing different TCI state determination methods for different signal types and directions. Each signal type (PDSCH, PDCCH, PUSCH, PUCCH) has its own specific determination rules based on local requirements, providing flexibility where needed while maintaining operational simplicity through localized, specialized methods rather than a single complex unified approach.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives information indicating a unified transmission configuration indication (TCI) state and one piece of downlink control information indicating a plurality of UL transmissions, and a control section that determines a unified TCI state to be applied to the plurality of UL transmissions, based on at least one of information indicated by the downlink control information, a transmission/reception point (TRP) index corresponding to the UL transmission, and a control resource set pool index corresponding to the UL transmission.