Cross-Carrier Scheduling CORESET Mapping for Beam Indication
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in effectively managing beam indication and quasi-co-location (QCL) information for downlink control channels and data channels across different serving cells, especially in cross-carrier scheduling scenarios where traditional methods fail to provide accurate antenna port quasi-co-location for PDSCH reception.
Innovation Solution
The proposed solution involves configuring a first serving cell and a second serving cell for a UE, where the first PDCCH schedules a first PDSCH on the first serving cell, and a second PDCCH schedules a second PDSCH on the second serving cell, with the network indicating the UE to monitor the first PDCCH based on the CORESET configuration of the second serving cell, and using TCI states or default TCI states for determining PDSCH antenna port quasi-co-location, especially when the TCI field is not present in the DL DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cross-carrier scheduling is implemented to improve resource utilization and flexibility, then scheduling efficiency is improved, but beam indication accuracy for PDSCH reception deteriorates
Solution Approach 1:
The patent introduces a mapping relationship between CORESETs of different serving cells as an intermediary mechanism. When a first PDCCH on a first serving cell schedules a PDSCH on a second serving cell, the UE determines the TCI state for the scheduled PDSCH by mapping the CORESET ID of the scheduling PDCCH to a corresponding CORESET on the scheduled serving cell. This mapping resolves the beam indication ambiguity in cross-carrier scheduling by providing a systematic way to transfer QCL information across carriers.
Solution Approach 2:
The patent establishes preliminary configuration of CORESET mappings before cross-carrier scheduling operations. The network configures the UE with mapping relationships between CORESETs of different serving cells in advance, so that when cross-carrier scheduling occurs, the UE can immediately determine the appropriate TCI state without additional signaling delay. This preliminary setup enables efficient beam indication while maintaining scheduling flexibility.
2Device complexity
If traditional beam indication methods are used to maintain simplicity, then system complexity is reduced, but reliability of PDSCH reception in cross-carrier scheduling deteriorates
Solution Approach 1:
The patent creates a universal CORESET mapping mechanism that works for both intra-carrier and cross-carrier scheduling scenarios. The same mapping framework applies regardless of whether the scheduling and scheduled cells are the same or different, providing a unified approach that maintains simplicity while improving reliability. The UE uses the same TCI state determination procedure for all PDCCH-to-PDSCH scheduling cases.
3Measurement precision
If CORESET configuration is configured for each serving cell to ensure proper beam management, then beam management accuracy is improved, but configuration complexity and signaling overhead increase
Solution Approach 1:
The patent merges the beam management configurations across serving cells by establishing mapping relationships between their CORESETs. Instead of treating each serving cell's CORESET configuration independently, the mapping mechanism combines them into a coordinated system where the TCI state of a CORESET on one serving cell can be referenced by another serving cell. This reduces redundancy in configuration while maintaining beam management accuracy.
Data Source
AI summary
A method and apparatus are disclosed from the perspective of a network. In one embodiment, the method includes the network configuring a first serving cell and a second serving cell to a UE, wherein a first PDCCH scheduling a first PDSCH on the first serving cell and a second PDCCH scheduling a second PDSCH on the second serving cell are transmitted via a CORESET of the second serving cell. The method further includes the network not configuring a CORESET configuration for the first serving cell. Furthermore, the method includes the network indicating the UE to receive and/or monitor the first PDCCH based on CORESET configuration of the second serving cell.