Default Beam Switching for Multi-PDSCH Scheduling Delays
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Solution Overview
Problem
Existing wireless communication systems, particularly 5G NR, face challenges in efficiently receiving multiple physical downlink shared channels (PDSCHs) scheduled by downlink control information (DCI) due to processing time constraints and beam management complexities.
Innovation Solution
A method where a user equipment (UE) receives downlink control information (DCI) scheduling multiple PDSCHs within a threshold processing time, using a default beam assumption until a subsequent control signal is received or until the processing time expires, allowing for efficient decoding and reception of PDSCHs based on configured TCI states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for a second control signal within the threshold processing time to determine beam configuration, then beam management accuracy improves, but data reception delay increases
Solution Approach 1:
The UE performs preliminary action by receiving and buffering data using a default TCI state before the second control signal arrives. This allows the UE to prepare data reception in advance with a preliminary beam configuration, then switch to the updated TCI state when the second control signal is received, thereby reducing data reception delay while maintaining beam management accuracy
Solution Approach 2:
The patent implements dynamic beam management by allowing the UE to switch TCI states during the threshold processing time. The UE dynamically transitions from a default TCI state to an updated TCI state based on the arrival of the second control signal, enabling adaptive beam configuration that balances between early data reception and accurate beam management
2Productivity
If the UE uses a default TCI state for data reception, then data reception speed improves, but beam configuration accuracy deteriorates
Solution Approach 1:
The UE applies preliminary action by using a default TCI state to begin data reception immediately after the first control signal, rather than waiting for optimal beam configuration. This preliminary data reception using default beam settings enables faster data access, while the subsequent update to the second TCI state refines the beam configuration for improved accuracy
Solution Approach 2:
The patent utilizes parameter changes by transitioning the TCI state parameter from a default value to an updated value based on the second control signal. This parameter change allows the system to first operate with simplified default parameters for speed, then refine the parameters for accuracy when additional control information becomes available
Data Source
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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 (1002). 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 (1004). 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 (1007) or -b- until the second CORESET when the second CORESET exists in the threshold processing time (1006).