Cross-Carrier Beam Selection Using CORESETPoolIndex
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Solution Overview
Problem
In wireless communications, determining default TCI states for downlink signals in cross-carrier scheduling is challenging due to insufficient time for UE to decode DCI and adjust beams, leading to potential wrong QCL assumptions, especially in multi-TRP scenarios.
Innovation Solution
The method involves using the higher layer parameter CORESETPoolIndex to determine default TCI states for PDSCH and aperiodic CSI-RS reception, considering the configuration of CORESETs on different carriers and timing offsets, ensuring correct QCL assumptions based on activated TCI states and CORESET IDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scheduling offset is reduced to improve scheduling flexibility and throughput, then productivity increases, but the UE cannot decode DCI and determine correct TCI states in time, worsening reliability
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and CORESETPoolIndex values before scheduling occurs. The UE is provided with a set of candidate TCI states and corresponding CORESETPoolIndex configurations in advance, so that when cross-carrier scheduling occurs with insufficient time offset, the UE can immediately select the appropriate pre-configured TCI state based on the scheduling carrier's CORESETPoolIndex without needing time to decode and determine it dynamically.
2Productivity
If cross-carrier scheduling is implemented to improve resource allocation efficiency, then productivity increases, but wrong QCL assumptions occur when insufficient time is available, worsening reliability
Solution Approach 1:
The patent introduces CORESETPoolIndex as an intermediary parameter that links the scheduling carrier to the appropriate TCI state. The CORESETPoolIndex acts as a mediator that the UE uses to identify which pre-configured TCI state corresponds to the scheduling carrier, enabling correct QCL assumptions to be established without requiring time-consuming decoding and determination processes.
3Reliability
If multiple TCI states are activated for multi-TRP transmission to improve reliability, then device complexity increases, but this creates ambiguity in determining the correct default TCI state, worsening ease of operation
Solution Approach 1:
The patent applies local quality by associating each TCI state with a specific CORESETPoolIndex value, creating a unique local identifier for each TCI state configuration. This allows the UE to distinguish between multiple activated TCI states and select the correct one based on the local property (CORESETPoolIndex) of the scheduling carrier, eliminating ambiguity in default TCI state selection while maintaining multi-TRP transmission reliability.
Data Source
AI summary
Methods and apparatuses for determining default beam (s) are disclosed. A method comprises receiving a control signal scheduling or triggering a downlink signal, wherein the control signal is received on a first carrier, the downlink signal is received on a second carrier, the first carrier is different from the second carrier; and determining a default TCI state for reception of the downlink signal according to a higher layer parameter CORESETPoolIndex if the scheduling or triggering offset is less than a threshold.