Uplink UCI Multiplexing for CG-PUSCH and HARQ-ACK Overlap
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Solution Overview
Problem
Existing communication systems face challenges in ensuring reliable and low-latency transmission of uplink control information (UCI) on unlicensed bands, particularly when there is a time-domain overlap between configure grant-physical uplink share channel (CG-PUSCH) and hybrid automatic repeat request acknowledgement (HARQ-ACK), as they lack effective multiplexing strategies to prioritize and transmit high-priority information.
Innovation Solution
A method and apparatus for multiplexing UCI that determines a multiplexing mode based on the priority of CG-PUSCH and HARQ-ACK, allowing for joint encoding or prioritized transmission of CG-UCI and HARQ-ACK on CG-PUSCH or PUCCH, guided by network device-indicated multiplexing parameters, to ensure timely and reliable transmission in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CG-PUSCH and PUCCH are transmitted simultaneously in time-domain overlap, then transmission capacity is improved, but transmission reliability deteriorates due to lack of priority-based multiplexing
Solution Approach 1:
The patent segments the uplink control information into different priority levels (first priority and second priority). When time-domain overlap occurs between CG-PUSCH and PUCCH, the terminal device selectively multiplexes only the high-priority UCI on CG-PUSCH, while low-priority UCI is transmitted separately on PUCCH. This segmentation by priority ensures that critical control information is reliably transmitted without being blocked by lower-priority transmissions.
Solution Approach 2:
The patent changes the transmission parameter (multiplexing behavior) based on the priority parameter of UCI. When priority is high, the system enables multiplexing on CG-PUSCH; when priority is low, it uses separate PUCCH transmission. This dynamic parameter adjustment based on priority ensures optimal transmission reliability for different types of control information while maintaining overall system capacity.
2Reliability
If priority-based multiplexing is implemented, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling the terminal device to autonomously determine priority levels of UCI and select appropriate multiplexing modes without requiring complex network-side scheduling decisions. The terminal uses pre-configured priority information and autonomously makes multiplexing decisions, which simplifies the overall system architecture while maintaining high transmission reliability through priority-based resource allocation.
3Loss of time
If CG-UCI and HARQ-ACK are multiplexed on CG-PUSCH, then latency is reduced, but transmission reliability may deteriorate without priority differentiation
Solution Approach 1:
The patent introduces dynamic multiplexing behavior that adapts to the priority characteristics of different UCI types. For high-priority UCI (such as HARQ-ACK), the system dynamically enables multiplexing on CG-PUSCH to reduce latency. For low-priority UCI (such as CG-UCI), the system dynamically selects separate PUCCH transmission to ensure reliability. This dynamic adaptation resolves the contradiction between latency reduction and reliability maintenance.
Data Source
AI summary
A method for multiplexing uplink control information (UCI) for unlicensed band transmission, is performed by a terminal device. The method includes: in response to a time-domain overlap between a configure grant-physical uplink share channel (CG-PUSCH) and a hybrid automatic repeat request acknowledgement (HARQ-ACK) carried on a physical uplink control channel (PUCCH), determining, based on a priority of the CG-PUSCH and a priority of the HARQ-ACK, a multiplexing mode for CG-UCI carried on the CG-PUSCH and the HARQ-ACK; and transmitting information to a network device based on the multiplexing mode, wherein the information transmitted includes at least one of the CG-UCI or the HARQ-ACK.