TCI State Mapping for Multi-Occasion PDSCH Reliability
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Solution Overview
Problem
Existing systems lack clear guidelines for determining Transmission Configuration Indication (TCI) states for multiple transmission occasions in New Radio (NR) communications, leading to inconsistent UE behavior and potentially degraded PDSCH performance.
Innovation Solution
A method for determining TCI states for multiple transmission occasions involves receiving a configuration, including a list of TCI states, an activation command, and a time threshold, and using these to schedule transmission occasions, ensuring consistent UE behavior and robust PDSCH transmission over multiple Transmission Reception Points (TRPs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clear guidelines for determining TCI states for multiple transmission occasions are not provided, then UE behavior becomes inconsistent and PDSCH performance degrades, but providing such guidelines increases system complexity
Solution Approach 1:
The patent segments the determination of TCI states by introducing a time threshold that divides transmission occasions into two categories: those with time offsets below the threshold and those at or above the threshold. This segmentation allows different TCI state determination rules to apply to different scenarios, providing clear guidelines while managing complexity through structured classification.
Solution Approach 2:
The patent establishes predetermined rules for TCI state determination based on time offsets relative to a threshold. These preliminary rules are configured in advance, allowing UEs to consistently determine appropriate TCI states without complex real-time decision-making, thereby improving reliability while controlling complexity through pre-defined behavior.
2Stability of the object's composition
If TCI states are determined based on time offsets and thresholds, then consistent UE behavior is achieved, but the system requires additional configuration parameters increasing complexity
Solution Approach 1:
The patent introduces specific parameters (time threshold, time offsets) to control TCI state determination behavior. By changing these parameters, the system achieves consistent UE behavior across different scenarios. The parameters provide a standardized mechanism for controlling complexity while ensuring stability and consistency in UE actions.
3Reliability
If multiple TCI states are supported for different transmission occasions, then PDSCH performance in multi-TRP scenarios improves, but the processing complexity increases
Solution Approach 1:
The patent segments transmission occasions based on time offsets relative to a threshold, allowing different TCI states to be applied to different segments. This enables multi-TRP transmission support with improved performance while managing complexity through structured segmentation rather than unrestricted multi-state handling.
Solution Approach 2:
The patent applies different TCI states to different transmission occasions based on local conditions (time offsets). This local quality approach allows optimized PDSCH performance for each transmission occasion while maintaining manageable complexity through context-dependent rather than globally complex processing.
Data Source
AI summary
Systems and methods for determining Transmission Configuration Indication (TCI) states for multiple transmission occasions are provided. In some embodiments, a method performed by a wireless device includes: receiving a configuration including: a list of TCI states; a TCI activation command in activating a subset of the TCI states and mapping between each of the codepoints to activated TCI states; and a time threshold; receiving in a slot a scheduling message scheduling the transmission occasions; determining time offsets between receiving the scheduling message and each transmission occasion; determining a TCI state for each transmission occasion if at least one time offset is less than the time threshold; and receiving the transmission occasions with the determined TCI states. The proposed solutions ensure consistent UE behavior and allow for more robust PDSCH transmission over multiple TRPs.