PUCCH Overlap Handling for Reliable URLLC UCI Transmission
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Rel-16 of 5G NR, the overlap of uplink control information (UCI) transmissions for different service types, such as URLLC and eMBB, affects transmission delay and reliability due to conventional multiplexing rules.
Innovation Solution
A method where, when PUCCHs carrying different UCIs overlap, the UCI with lower priority is dropped if the PUCCH formats are different, ensuring the UCI with higher priority is transmitted without format change, specifically for URLLC services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional multiplexing transmission rules are applied to overlapping UCI transmissions of different service types, then resource utilization is improved, but transmission delay and reliability of high-priority UCI (URLLC) deteriorate
Solution Approach 1:
The patent segments UCI transmissions by service type priority, separating high-priority URLLC UCI from low-priority eMBB UCI. When PUCCH formats differ, the method segments the transmission by dropping low-priority UCI and transmitting only high-priority UCI, thereby ensuring URLLC reliability while still allowing multiplexing when formats match.
Solution Approach 2:
The patent changes the transmission parameter (PUCCH format) as a decision criterion. By comparing whether the PUCCH formats for overlapping UCIs are the same or different, the system dynamically adjusts transmission behavior: multiplex when formats match, drop low-priority UCI when formats differ, thereby optimizing both reliability and resource utilization.
2Adaptability or versatility
If PUCCH format change is allowed during simultaneous transmission of overlapping UCIs, then transmission flexibility is improved, but transmission delay of high-priority UCI deteriorates
Solution Approach 1:
The patent performs preliminary determination of PUCCH format compatibility before transmission. By checking in advance whether the PUCCH formats for overlapping UCIs are the same, the system avoids format changes during transmission that would cause delays, ensuring timely URLLC UCI transmission while maintaining flexibility when formats match.
3Productivity
If multiplexing transmission is performed for overlapping UCIs with different PUCCH formats, then resource efficiency is improved, but transmission reliability of high-priority UCI deteriorates
Solution Approach 1:
The patent applies different transmission qualities to different UCI types based on their service requirements. For high-priority URLLC UCI, the method ensures reliable transmission by dropping low-priority UCI when formats differ. For low-priority eMBB UCI, the method accepts potential dropping. This local quality differentiation ensures overall system resource efficiency while protecting high-priority transmission reliability.
Data Source
AI summary
The present disclosure provides an uplink control information (UCI) transmission method and device, a terminal and a base station, the method includes: when a physical uplink control channel (PUCCH) carrying a first UCI and a PUCCH carrying a second UCI overlap in a time domain, dropping the second UCI and transmitting the first UCI, if a PUCCH format used for simultaneous transmission of the first UCI and the second UCI is different from a PUCCH format used for a PUCCH carrying the first UCI.