Multi-PDSCH Beam Assumption Across CORESET Timing Gaps
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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 limitations in processing time and transmission configuration indication (TCI) states, leading to suboptimal data reception.
Innovation Solution
The UE receives DCI scheduling multiple PDSCHs within a threshold processing time, determines a set of TCI states with the lowest codepoint, and processes data according to these states until the next CORESET is available or the processing time ends, ensuring timely decoding and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives multiple PDSCHs scheduled by DCI within a threshold processing time, then the data reception efficiency is improved, but the complexity of determining TCI states increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the TCI state to be used before the processing time expires. The UE identifies and selects the appropriate TCI state (either from the first CORESET or from DCI indication) in advance, so that when multiple PDSCHs need to be received within the threshold processing time, the TCI state is already determined and can be applied without additional complexity during the time-critical reception phase.
Solution Approach 2:
The patent changes the parameter of TCI state selection based on timing conditions. When the second CORESET falls within the threshold processing time, the TCI state parameter is determined by the first CORESET; when it falls outside, the TCI state parameter can be indicated by DCI. This dynamic parameter change resolves the contradiction by adapting the TCI state determination method to the specific timing scenario.
2Reliability
If the UE waits for the second CORESET to determine TCI state, then the accuracy of TCI state selection is improved, but the time for data reception is increased
Solution Approach 1:
The patent applies preliminary action by using the first CORESET to determine the TCI state in advance, before the second CORESET becomes available. This allows the UE to start receiving data according to the determined TCI state without waiting for the second CORESET, thus reducing time loss while maintaining reliability through the preliminary TCI state determination.
Solution Approach 2:
The patent applies partial action by using only the first CORESET for TCI state determination when time is critical, rather than waiting for the complete information from the second CORESET. This partial determination is sufficient to enable timely data reception, and the UE can adjust or refine the TCI state later if needed, balancing accuracy requirements with time constraints.
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.