PUCCH Uplink Beam Determination via Downlink Linkage
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Solution Overview
Problem
In the new wireless communication system, there is no explicit method or device to support Physical Uplink Control Channel (PUCCH) transmission using different beams for multiple Transmission and Reception Points (TRPs), which poses a technical challenge in ensuring correct PUCCH transmission.
Innovation Solution
A method and device that determine the uplink beam for PUCCH transmission based on the downlink beam used by the Physical Downlink Control Channel (PDCCH) and/or Physical Downlink Shared Channel (PDSCH), utilizing Beam Pair Linkage (BPL), Quasi-Co-Location (QCL) relationships, or beam indices to ensure correct PUCCH transmission without additional signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If PUCCH transmission is performed in a new wireless communication system with multiple TRPs using different beams, then the system can support diverse transmission scenarios, but there is no explicit solution for beam selection causing transmission reliability issues
Solution Approach 1:
The network pre-configures multiple downlink beams and their corresponding uplink beams for the terminal before PUCCH transmission. The terminal stores these beam mappings and uses them when needing to transmit PUCCH, eliminating the need for real-time beam negotiation and ensuring reliable transmission from the outset
Solution Approach 2:
The patent introduces downlink beam indices as an intermediary to indirectly indicate the uplink beam selection. Instead of directly specifying uplink beams, the network configures associations between downlink beam indices and uplink beams, and the terminal uses the received downlink beam index to determine the appropriate uplink beam, simplifying the signaling process
2Reliability
If additional signaling is introduced to explicitly indicate uplink beam selection, then transmission reliability improves, but signaling overhead increases
Solution Approach 1:
The downlink beam index serves multiple functions: it identifies the downlink beam for PDCCH/PDSCH reception and simultaneously indicates the corresponding uplink beam for PUCCH transmission. This multi-functionality eliminates the need for separate uplink beam indication signaling, reducing overhead while maintaining reliability
Solution Approach 2:
The patent uses the downlink beam configuration as a template or copy to define the uplink beam association. The same beam index structure and identification methods used for downlink beams are copied and applied to uplink beam indication, avoiding the need for separate signaling mechanisms
Data Source
AI summary
Provided are a physical uplink control channel (PUCCH) transmission method, user equipment and device, used to solve the technical problem that there is no clear method or device in existing technology which supports a PUCCH transmission scenario in a new wireless communication system. The PUCCH transmission method comprises: determining an uplink beam used during PUCCH transmission on the basis of a downlink beam used by a physical downlink control channel (PDCCH) and/or a physical downlink shared channel (PDSCH); and carrying out PUCCH transmission using the determined uplink beam.