NR Terminal Uplink Beam Control Using PDSCH TCI Indication
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Solution Overview
Problem
The control of uplink beams in next-generation mobile communication systems, particularly in Rel. 16 NR, is not adequately addressed, which can suppress the increase in communication throughput.
Innovation Solution
A terminal that determines an uplink TCI state based on a Transmission Configuration Indication field in downlink control information (DCI) to facilitate appropriate uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UL beam control methods are not clarified for Rel. 16 NR, then system complexity is reduced, but communication throughput increases are suppressed
Solution Approach 1:
The patent applies universality by using the existing TCI field in DCI, originally designed for DL beam indication, to also indicate UL beams. This multi-functional use of the TCI field allows the system to achieve UL beam control without adding new signaling mechanisms, thereby increasing throughput while avoiding additional complexity in beam control procedures
Solution Approach 2:
The patent employs copying by replicating the DL TCI state indication mechanism for UL beam control. The UE determines UL TCI states based on the TCI field values used for DL PDSCH beam indication, effectively copying the successful DL beam management approach to the UL domain. This eliminates the need for separate UL beam control signaling, thus improving throughput without increasing system complexity
2Productivity
If multiple TRPs and panels are introduced for DL transmission, then communication capacity increases, but beam control complexity for UL transmission increases
Solution Approach 1:
The patent extends the universality principle by enabling the single TCI field in DCI to indicate UL beams for multiple TRPs and panels. Instead of creating separate control mechanisms for each TRP-panel combination, the system uses the existing TCI field to efficiently indicate the appropriate UL beam, thereby maintaining communication capacity while avoiding exponential growth in control complexity
Solution Approach 2:
The patent applies parameter changes by utilizing the TCI field value from DCI to dynamically determine UL TCI states. This parameter-based approach allows flexible adaptation to multiple TRPs and panels without requiring complex control procedures, as the UL beam selection is directly derived from the TCI field parameter already present in the scheduling DCI
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives downlink control information (DCI) to schedule a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), and a control section that determines an uplink TCI state on the basis of a Transmission Configuration Indication (TCI) field for the PDSCH included in the DCI. According to one aspect of the present disclosure, it is possible to perform appropriate UL transmission.