Terminal Beam Indication via Unified MAC CE for PDSCH and PUSCH
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Solution Overview
Problem
In future radio communication systems, latency and overhead in beam indication for downlink and uplink can deteriorate communication quality and throughput.
Innovation Solution
A terminal that includes a receiving section to handle MAC CEs for activating TCI states for PDSCH and PUSCH, and a control section to apply these states, facilitating appropriate beam notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate MAC CEs are used for indicating TCI states for PDSCH and PUSCH, then beam indication accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent combines separate MAC CEs for PDSCH and PUSCH TCI state indication into a single unified MAC CE structure. This unified MAC CE can indicate TCI states for both downlink and uplink channels simultaneously, reducing the total number of MAC CE messages while maintaining the ability to provide accurate beam indication for both directions.
Solution Approach 2:
The unified MAC CE is designed to serve multiple functions: it can indicate TCI states for PDSCH, PUSCH, or both channels in a single message. This multi-functional design allows the system to adapt to different indication needs without requiring separate specialized MAC CEs for each channel type.
2Measurement precision
If separate MAC CEs are used for indicating TCI states for PDSCH and PUSCH, then beam indication specificity is improved, but processing latency increases
Solution Approach 1:
By merging the indication of TCI states for PDSCH and PUSCH into a single MAC CE message, the patent reduces the number of separate processing steps required. The terminal can receive and process one unified message instead of handling multiple separate messages sequentially, thereby reducing processing latency while maintaining specific beam indication for each channel.
3Quantity of substance
If unified MAC CE is used for indicating TCI states for PDSCH and PUSCH, then signaling overhead is reduced, but beam indication flexibility decreases
Solution Approach 1:
The unified MAC CE incorporates dynamic indication mechanisms that allow the system to flexibly adapt to different beam indication scenarios. The MAC CE structure can dynamically adjust which TCI states are indicated for which channels based on current communication needs, maintaining flexibility while using a single unified message format.
4Loss of time
If unified MAC CE is used for indicating TCI states for PDSCH and PUSCH, then processing latency is reduced, but indication detail level may be compromised
Solution Approach 1:
The unified MAC CE uses segmentation to organize TCI state indications for different channels within a single message structure. Each channel's TCI states are segmented into distinct fields or sections within the MAC CE, allowing the terminal to efficiently parse and process the information for each channel separately while receiving everything in one unified message, thus reducing latency without losing detail.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes a receiving section that receives a first media access control-control element (MAC CE) indicating one or more first transmission configuration indication (TCI) states activated for a physical downlink shared channel (PDSCH) and receives a second MAC CE indicating one or more second TCI states activated for a physical uplink shared channel (PUSCH), and a control section that applies the one or more second TCI states indicated by the second MAC CE to the PUSCH. According to an aspect of the present disclosure, beams can be appropriately notified.