PUCCH Repetition Control Using Multiple Spatial Relations
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Solution Overview
Problem
Existing NR specifications fail to effectively improve the quality of Physical Uplink Control Channel (PUCCH) reception and communication throughput by suppressing spatial diversity gain and high rank transmission when multiple transmission/reception points are used, due to the inability to apply different Spatial Relation Information (SRI) in PUCCH repetition.
Innovation Solution
A terminal determines the number of PUCCH repetitions based on the number of spatial relations and transmission configuration indication (TCI) states, enabling repetitive PUCCH transmission using different SRIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one piece of PUCCH SRI is active for one PUCCH resource in Rel-15 NR, then control simplicity is maintained, but spatial diversity gain and high rank transmission cannot be achieved when multiple transmission/reception points are used
Solution Approach 1:
The patent introduces dynamic SRI activation and deactivation control, allowing the system to transition from a static single-SRI configuration to a dynamic multi-SRI configuration. The terminal receives SRI activation/deactivation indications from the base station and activates or deactivates corresponding SRIs based on these indications, enabling flexible adaptation to different transmission scenarios while maintaining manageable control complexity through standardized signaling procedures.
Solution Approach 2:
The patent segments the SRI configuration into multiple independently controllable SRI entries (first SRI, second SRI, etc.), each associated with different transmission/reception points. This segmentation allows different SRIs to be activated simultaneously for different PUCCH resources, enabling spatial diversity gain and high rank transmission while keeping each individual SRI configuration simple and manageable.
2Reliability
If repetitive PUCCH transmission is performed without applying different SRIs, then transmission reliability is improved through repetition, but effective improvement in reception quality and communication throughput is suppressed
Solution Approach 1:
The patent applies different spatial relations (different SRIs) to different PUCCH repetitions, where each SRI is optimized for specific transmission/reception point characteristics. This local optimization of spatial quality for each repetition enables the system to achieve both improved reception quality through spatial diversity and maintained throughput by ensuring reliable delivery of control information across multiple transmission points.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a control section that determines the number of repetitions of a Physical Uplink Control Channel (PUCCH) on the basis of at least one of the number of spatial relations and the number of transmission configuration indication (TCI) states, and a transmitting section that repetitively transmits the PUCCH in accordance with the number of the repetitions. According to one aspect of the present disclosure, it is possible to achieve preferable repetitive PUCCH transmission.