Repetitive PUCCH Transmission Using Multiple Spatial Relations
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Solution Overview
Problem
Existing NR specifications fail to effectively apply different spatial relation information (SRI) in repetitive Physical Uplink Control Channel (PUCCH) transmissions, leading to inadequate spatial diversity gain, high rank transmission, and suppressed communication throughput when multiple transmission/reception points are used.
Innovation Solution
A terminal and radio communication method that applies a plurality of spatial relation information for PUCCH resources, enabling repetitive PUCCH transmission using different spatial domain filters based on configured SRI sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one PUCCH SRI is active for one PUCCH resource according to Rel-15 NR specifications, then the system maintains simple control structure, but spatial diversity gain and reception quality cannot be effectively improved in repetitive PUCCH transmission
Solution Approach 1:
The patent segments the single SRI control into multiple SRIs (first SRI and second SRI) that can be independently applied to different PUCCH transmission occasions. This segmentation allows each transmission to use different spatial relation information, enabling spatial diversity gain while maintaining manageable control complexity through structured configuration.
Solution Approach 2:
The patent introduces dynamic selection of spatial relation information where the terminal can switch between first SRI and second SRI based on the transmission occasion index. This dynamic approach enables adaptive spatial diversity in repetitive transmissions while the control structure remains organized through predefined configuration rules.
2Productivity
If repetitive PUCCH transmission is performed without applying different SRI, then the control structure remains simple, but spatial diversity gain and communication throughput are suppressed
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SRIs (first SRI and second SRI) before repetitive PUCCH transmission begins. The terminal uses the pre-configured spatial relation information according to a determined rule (e.g., alternating based on transmission occasion index), enabling high throughput repetitive transmissions without real-time complex control decisions.
Solution Approach 2:
The patent changes the spatial relation information parameter across different PUCCH transmission occasions by selecting from multiple configured SRIs. This parameter variation enables spatial diversity gain and improved communication throughput while the configuration complexity is managed through structured pre-configuration rather than ad-hoc adjustments.
3Reliability
If multiple transmission/reception points are used without different SRI application, then the system structure remains simple, but high rank transmission and spatial diversity gain cannot be achieved
Solution Approach 1:
The patent applies local quality by assigning different spatial relation information (first SRI and second SRI) to different local transmission occasions. This allows each transmission occasion to have optimized spatial characteristics appropriate for its specific context, achieving spatial diversity gain while the overall configuration remains structured and manageable.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a control section that applies, for one Physical Uplink Control Channel (PUCCH) resource, a plurality of spatial relation information (SRI), and a transmitting section that performs transmission of a plurality of PUCCH transmission occasions in the PUCCH resource by using respective spatial domain transmission filters based on the plurality of spatial relation information. According to one aspect of the present disclosure, it is possible to achieve preferable repetitive PUCCH transmission.