PUCCH Multiplexing for Beam Failure Recovery
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Solution Overview
Problem
In wireless communication systems, the overlap of beam failure recovery request (BFRQ)-PUCCH and HARQ-ACK PUCCH resources leads to the dropping of BFRQ-PUCCH, causing unnecessary energy waste and delay in beam failure recovery procedures.
Innovation Solution
A method where the user equipment (UE) transmits the PUCCH in a first resource related to a scheduling request (SR) based on a first PUCCH format, and when this resource overlaps with a second PUCCH resource using a second PUCCH format for HARQ-ACK information, the PUCCH is transmitted in the second resource through multiplexing based on the second PUCCH format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing UCI collision handling method is used where SR-PUCCH and HARQ-ACK PUCCH are overlapped, then the HARQ-ACK PUCCH is transmitted, but the BFRQ-PUCCH is dropped causing delay and energy waste
Solution Approach 1:
The patent changes the handling parameter of PUCCH resource overlap from simple dropping to multiplexing-based selection. When BFRQ-PUCCH and HARQ-ACK PUCCH resources overlap, the UE now multiplexes the BFRQ information with HARQ-ACK and transmits them together in the HARQ-ACK PUCCH resource, changing the transmission parameter from drop to multiplexed transmission, thereby ensuring BFRQ reliability while avoiding delay
Solution Approach 2:
The patent makes the HARQ-ACK PUCCH resource serve multiple functions: it not only transmits HARQ-ACK information but also can multiplex and transmit BFRQ information when resources overlap. This multi-functionality allows the same resource to handle both HARQ-ACK and beam failure recovery, eliminating the need for separate BFRQ resource allocation and reducing delay
2Device complexity
If BFRQ-PUCCH is dropped due to resource overlap with HARQ-ACK PUCCH, then resource conflict is resolved, but unnecessary energy waste occurs
Solution Approach 1:
The patent merges the BFRQ transmission with HARQ-ACK transmission by multiplexing them in the same PUCCH resource. Instead of treating them as separate transmissions that may conflict, the invention combines them into a single multiplexed transmission, eliminating resource conflicts and the associated energy waste from dropping BFRQ while maintaining efficient resource utilization
Data Source
AI summary
A method by which a terminal transmits a physical uplink control channel (PUCCH) in a wireless communication system according to one embodiment of the present specification comprises the steps of: receiving configuration information related to a PUCCH; and transmitting the PUCCH on the basis of the configuration information. The PUCCH is transmitted in a first PUCCH resource related to a scheduling request (SR), and the first PUCCH resource is based on a first PUCCH format. On the basis of the first PUCCH resource overlapping with a second PUCCH resource using a second PUCCH format for transmission of HARQ-ACK information, the PUCCH is transmitted in the second PUCCH resource through multiplexing based on the second PUCCH format.