Multi-PDSCH Beam Assumption Under DCI Processing Time Limits
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently scheduling multiple physical downlink shared channels (PDSCHs) due to limitations in processing time and beam management, leading to suboptimal data reception at user equipment (UEs).
Innovation Solution
The UE receives downlink control information (DCI) within a threshold processing time, determining a default TCI state for data reception until the next control signal is available, or until the processing time expires, thereby optimizing data decoding and beam management across multiple control resource sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE waits for all control signals to be received before decoding DCI, then beam alignment accuracy is improved, but processing latency increases
Solution Approach 1:
The UE performs beam alignment preparation and receives control signals in advance within the threshold processing time before DCI decoding is required. This preliminary action allows the UE to have beam alignment information ready before the actual data reception, resolving the contradiction by preparing the beam state beforehand rather than waiting until the last moment.
Solution Approach 2:
The patent implements dynamic beam management where the UE can switch between different TCI states based on timing conditions. If a second CORESET exists within the threshold processing time, the UE uses the corresponding TCI state; otherwise, it falls back to a default TCI state. This dynamic adaptation allows the system to optimize between beam accuracy and latency based on real-time conditions.
2Productivity
If the UE uses default TCI state for data reception, then processing speed is improved, but beam management complexity increases
Solution Approach 1:
The patent applies different TCI state selection strategies to different time intervals and conditions. Within the threshold processing time, the UE monitors for second CORESETs and selects TCI states accordingly. Outside this threshold or when no second CORESET is present, the UE uses default TCI states. This localized application of different strategies simplifies the overall system by providing clear rules for when to use complex beam management versus simpler default behavior.
Solution Approach 2:
The patent segments the beam management process into distinct phases: (1) receiving DCI within threshold processing time, (2) monitoring for second CORESET within the same threshold period, and (3) selecting appropriate TCI states based on which phase applies. This segmentation creates manageable decision points that reduce overall system complexity while maintaining processing speed.
3Adaptability or versatility
If multiple CORESETs are monitored within threshold processing time, then scheduling flexibility is improved, but processing overhead increases
Solution Approach 1:
The UE performs partial monitoring of CORESETs by focusing attention on whether a second CORESET exists within the threshold processing time, rather than continuously processing all possible control signals. This partial action approach provides sufficient scheduling flexibility for multi-PDSCH scenarios while avoiding the excessive processing overhead of monitoring every possible control signal opportunity.
Solution Approach 2:
The patent implements self-service mechanisms where the UE autonomously determines whether a second CORESET is present within the threshold processing time and independently selects the appropriate TCI state without requiring additional network coordination. This self-service capability reduces processing overhead by eliminating redundant signaling while maintaining the scheduling flexibility needed for multiple PDSCHs.
Data Source
AI summary
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE receives, at a time point, DCI scheduling two or more downlink data channels. The UE receives, within a threshold processing time from the time point, a first control signal in a first CORESET according to a first TCI state. The threshold processing time is allocated for the UE to decode the downlink control information. The UE receives, subsequent to the first CORESET, data according to the first TCI state (a) until an end of the threshold processing time when a second CORESET in which the UE is configured to receive a second control signal does not exist in the threshold processing time or (b) until the second CORESET when the second CORESET exists in the threshold processing time.