Terminal Device PUCCH Resource Determination for Multi-TRP Feedback
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Solution Overview
Problem
In multi-TRP communications systems, terminal devices face challenges in determining PUCCH resources for feedback information transmission due to overlapping resources and lack of spatial relation information, leading to difficulties in simultaneous transmission.
Innovation Solution
A method where the terminal device determines a target PUCCH resource by sorting DCI based on PDCCH monitoring occasions, serving cell indexes, and TRP identifiers, and then sends feedback information through this resource, allowing for effective feedback transmission even in scenarios with overlapping PUCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PUCCH resources are allocated for multi-TRP feedback, then feedback reliability is improved, but resource overlap and spatial relation conflicts prevent simultaneous transmission
Solution Approach 1:
The patent segments PUCCH resources by associating each TRP with dedicated spatial relation information and separate PUCCH resource pools. This segmentation prevents resource overlap conflicts by ensuring that feedback for different TRPs is transmitted on spatially distinct resources, resolving the contradiction between improving feedback reliability through multiple PUCCH resources and avoiding configuration conflicts.
Solution Approach 2:
The patent introduces spatial relation information as an additional dimension for PUCCH resource differentiation. By adding the spatial domain as a distinguishing dimension beyond just time and frequency resources, the system can allocate multiple PUCCH resources without conflicts, enabling simultaneous feedback transmission for multiple TRPs while maintaining proper resource management.
2Productivity
If PUCCH resources overlap in time domain, then resource utilization is improved, but terminal cannot send multiple PUCCHs simultaneously due to MIMO capability limitations
Solution Approach 1:
The patent applies local quality by assigning different spatial relation information to different PUCCH resources, even when they overlap in time domain. This allows the terminal to differentiate and transmit on overlapping resources by using distinct spatial directions or beams, effectively increasing resource utilization while maintaining transmission capability through spatial diversity.
3Adaptability or versatility
If spatial relation information is not available for PUCCH resources, then configuration flexibility is improved, but terminal cannot determine proper transmission spatial parameters
Solution Approach 1:
The patent implements preliminary action by pre-configuring spatial relation information for each TRP-associated PUCCH resource before feedback transmission. This advance configuration ensures that when feedback needs to be transmitted, the terminal already has the necessary spatial parameters ready, maintaining both configuration flexibility and spatial transmission accuracy without real-time determination delays.
Data Source
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AI summary
The embodiments of the present invention provide a feedback information transmission method and a terminal device, which relate to the field of communications technologies and are used to resolve the problem of how a terminal device sends feedback information in a multi-TRP communications system. The method is applied to a terminal device and includes: in the case of receiving at least two PDCCHs sent by at least two TRPs or different antenna panels of one TRP, determining a target PUCCH resource, and sending target feedback information through the target PUCCH resource, where the target feedback information is feedback information of each PDSCH scheduled by the at least two PDCCHs. The embodiments of the present invention are used for the transmission of feedback information.