PDCCH CORESET TCI Switching for Search Space Linking
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Solution Overview
Problem
Existing communication systems in LTE and NR face inefficiencies in managing TCI states and search space linking for PDCCH and PUSCH, leading to suboptimal performance in scenarios like eMBB, mMTC, and URLLC.
Innovation Solution
The terminal and base station apparatuses implement a configuration scheme for PDCCH and PUSCH that dynamically apply or skip TCI states and search space linking based on higher layer parameters, ensuring efficient communication by aligning DMRS ports with DL-RS using QCL principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TCI states and search space linking are applied for PDCCH and PUSCH, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic application of TCI states and search space linking based on higher layer parameters. The system can switch between applying TCI states (first indication) and not applying them (second indication) depending on network conditions and service requirements, making the system adaptable rather than static
Solution Approach 2:
The patent changes the parameter of TCI state application status through higher layer parameter configuration. By controlling whether TCI states are applied or not applied based on network-side configuration, the system optimizes the balance between reliability and complexity for different communication scenarios
2Adaptability or versatility
If both first TCI state and second TCI state are applied to CORESET, then communication adaptability is improved, but device complexity increases
Solution Approach 1:
The patent enables dynamic selection of TCI state application mode through higher layer parameters. The network can configure whether one TCI state or both first and second TCI states are applied to CORESET based on service requirements, allowing the system to adapt between single-state and dual-state modes as needed
Solution Approach 2:
The patent applies different TCI state configurations to different CORESETs or different PDCCH monitoring occasions based on local requirements. Not all CORESETs need to apply both TCI states simultaneously - the configuration can be localized to specific contexts where enhanced adaptability is needed
Data Source
AI summary
A terminal apparatus including a receiver configured to receive a first PDCCH to which first DCI is mapped and a second PDCCH in at least one CORESET, and a transmitter configured to transmit a PUSCH scheduled by second DCI mapped to the second PDCCH, wherein an SFN scheme is configured to be applied for the second PDCCH, search space linking is configured to be applied for the second PDCCH, the first DCI indicates a first TCI state and a second TCI state, in a case that one of the first TCI state and the second TCI state is applied to the one CORESET, the search space linking is applied and the SFN scheme is not applied, and in a case that both of the first TCI state and the second TCI state are applied to the one CORESET, the SFN scheme is applied and the search space linking is not applied.