PUCCH HARQ-ACK Multiplexing for Overlapping UCI Priorities
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Solution Overview
Problem
Challenges exist in efficiently multiplexing uplink control information (UCI) on physical uplink control channels (PUCCHs) due to overlapping channels of different priorities, leading to potential dropping of lower priority content and suboptimal resource utilization in wireless communication systems.
Innovation Solution
Mechanisms are introduced to define rules for multiplexing UCI of multiple single-slot PUCCHs onto a multi-slot PUCCH, allowing for flexible handling of overlapping PUCCHs with different priorities, thereby improving resource utilization and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple single-slot PUCCHs are multiplexed onto a multi-slot PUCCH, then resource utilization is improved and latency is reduced, but device complexity increases due to the need to handle overlapping channels of different priorities
Solution Approach 1:
The patent segments the multiplexing process into distinct priority levels (first priority and second priority UCI). The UE separately identifies and processes PUCCH resources for different priority levels, then combines them in a defined sequence. This segmentation simplifies the overall complexity by breaking down the multiplexing operation into manageable, priority-based stages rather than handling all UCI uniformly.
Solution Approach 2:
The patent applies preliminary action by determining the multiplexing of PUCCH content before actual transmission. The UE identifies overlapping PUCCH resources, determines which UCI to multiplex based on priority rules, and selects the target multi-slot PUCCH resource in advance. This preliminary determination prevents last-minute decision complexity and ensures systematic handling of priority-based multiplexing.
2Productivity
If flexible multiplexing rules are applied to handle overlapping PUCCHs of different priorities, then transmission efficiency is improved, but the difficulty of detecting and measuring UCI increases
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different UCI portions based on their importance. First priority UCI (e.g., URLLC-related) is handled with higher precedence in resource selection and multiplexing decisions, while second priority UCI (e.g., eMBB-related) is handled accordingly. This localized quality differentiation simplifies detection by providing clear priority-based rules rather than requiring complex analysis of all UCI components simultaneously.
Solution Approach 2:
The patent determines the priority classification and multiplexing configuration of PUCCH resources in advance, before actual UCI transmission and detection. The network configures the UE with specific multiplexing rules and priority assignments preliminarily, which reduces the complexity of real-time detection and measurement during actual operation.
3Loss of time
If PUCCH content is multiplexed based on priority rules, then latency is reduced by avoiding dropping of UCI, but the device complexity increases due to priority-based resource selection
Solution Approach 1:
The patent establishes priority-based multiplexing rules and resource configurations in advance through network signaling. The UE is pre-configured with rules for identifying first priority and second priority UCI, and pre-assigned PUCCH resources are configured with their respective priorities. This preliminary setup eliminates the need for complex real-time priority determination during transmission, reducing both latency and operational complexity.
Solution Approach 2:
The patent applies local quality by assigning specific priority levels to specific UCI portions and their corresponding PUCCH resources. This localized quality assignment creates clear, rule-based decision paths for the UE when selecting which UCI to transmit first, reducing latency by avoiding ambiguous decisions while keeping the complexity manageable through standardized priority levels.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communication by a user equipment (UE). According to certain aspects, a UE may be configured to determine that content of at least two first single-slot physical uplink control channel (PUCCHs) is to be multiplexed on to a second PUCCH, based on at least one rule, and process the second PUCCH, based on the at least one rule.