User Terminal Cross-Carrier Scheduling QCL Determination
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Solution Overview
Problem
In future radio communication systems, determining quasi-co-location (QCL) information is challenging when cross-carrier scheduling is configured, leading to potential degradation of system performance and frequency utilization efficiency.
Innovation Solution
A user terminal is equipped with a reception section to monitor a first downlink control channel for cross-carrier scheduling and a control section that assumes the presence of a transmission configuration indication (TCI) field in downlink control information, enabling appropriate determination of QCL even when the scheduled cell differs from the scheduling cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cross-carrier scheduling is configured, then scheduling flexibility and resource utilization are improved, but determination of QCL information becomes unclear and system performance degrades
Solution Approach 1:
The patent introduces TCI field information as an intermediary element in the DCI to bridge the scheduling cell and scheduled cell. This intermediary carries QCL information that enables the UE to determine the appropriate QCL relationship even when cross-carrier scheduling is configured, thus resolving the uncertainty in QCL determination while preserving scheduling flexibility
Solution Approach 2:
The patent applies preliminary action by pre-configuring TCI field information in the DCI structure before scheduling decisions are made. The TCI field is prepared in advance with appropriate QCL information based on the cross-carrier scheduling configuration, allowing the UE to directly use this pre-prepared information without additional determination steps
2Productivity
If cross-carrier scheduling is configured, then frequency utilization efficiency is improved, but system performance degrades due to unclear QCL determination
Solution Approach 1:
The TCI field information acts as a mediator that carries QCL information from the network to the UE in a structured manner. This intermediary ensures that even when operating in cross-carrier scheduling mode with improved frequency utilization, the UE can reliably determine QCL information to maintain system performance
Solution Approach 2:
The patent changes the parameter structure of DCI by incorporating TCI field information with specific parameters indicating QCL relationships. This parameter enhancement allows the system to maintain both high frequency utilization efficiency through cross-carrier scheduling and reliable system performance through explicit QCL parameter provision
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes: a reception section which monitors a first downlink control channel for cross-carrier scheduling in a first cell; and a control section which assumes that transmission configuration indication (TCI) field information indicating whether a TCI field exists in downlink control information is set to be enabled when a downlink shared channel of a second cell is scheduled by the downlink control information in the first downlink control channel and the second cell is different from the first cell. According to one aspect of the present disclosure, the information about the QCL can be appropriately determined when the user terminal configures the cross-carrier scheduling.