PDSCH HARQ-ACK Feedback Handling for URLLC Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, when a user equipment (UE) is configured with two HARQ codebooks of different priority classes, the current implementations face challenges in accurately identifying the correct PUCCH/PUSCH occasion for HARQ feedback due to non-numerical (NN) K1 values, which can affect the reliability of higher priority communications, such as ultra-reliable low latency communications (URLLC), by multiplexing feedback with lower priority traffic like enhanced mobile broadband (eMBB).
Innovation Solution
The system allows the UE to multiplex HARQ feedbacks with the same priority class on a PUCCH/PUSCH occasion by processing downlink control information (DCI) to identify a subsequent PDSCH with a numerical K1 value and matching priority class, ensuring that HARQ feedback is transmitted on the appropriate channel indicated by a subsequent DCI, thereby maintaining the reliability of higher priority communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ feedback is multiplexed on PUCCH/PUSCH occasion with non-numerical K1 values, then resource utilization is improved, but reliability of high priority communications deteriorates
Solution Approach 1:
The patent segments HARQ feedback into separate priority classes (first priority class and second priority class) with different K1 value handling. High priority feedback uses numerical K1 values for deterministic timing, while low priority feedback can use non-numerical K1 values for flexible resource utilization. This segmentation resolves the contradiction by allowing resource-efficient multiplexing for low priority traffic while preserving reliability for high priority communications.
Solution Approach 2:
The patent applies different quality requirements to different parts of the HARQ feedback system. Numerical K1 values are assigned to high priority communications requiring strict timing and reliability, while non-numerical K1 values are assigned to low priority communications where resource utilization is more important. This local differentiation of quality requirements allows the system to optimize each priority class according to its specific needs.
2Adaptability or versatility
If non-numerical K1 values are used for HARQ feedback timing, then flexibility in resource allocation is improved, but identification accuracy of correct PUCCH/PUSCH occasion deteriorates
Solution Approach 1:
The patent segments the K1 value system into numerical and non-numerical categories, each serving different purposes. Numerical K1 values provide precise timing identification for high priority feedback, while non-numerical K1 values provide flexibility for low priority feedback. The UE identifies the correct PUCCH/PUSCH occasion by selecting based on priority class matching, resolving the contradiction between flexibility and precision.
Solution Approach 2:
The patent introduces priority class as an intermediary parameter that mediates between the flexibility of non-numerical K1 values and the precision requirements for PUCCH/PUSCH occasion identification. By using priority class as the selection criterion, the system achieves both flexibility in resource allocation and accuracy in occasion identification through the priority-based matching mechanism.
Data Source
AI summary
A user equipment (UE) associated with a wireless communication system is disclosed. The UE comprises a processor configured to receive a first downlink control information (DCI) for scheduling a first physical downlink shared channel (PDSCH). The first DCI includes a non-numerical (NN) value of K1 for hybrid automatic repeat request (HARQ)-ACK feedback. The processor is further configured to determine a first priority class associated with the first PDSCH, and determine K1 value and priority class associated with one or more subsequent PDSCH received from the base station, until a selected PDSCH having a numerical K1 value and a same priority class as the first priority class is identified. Further, the processor is configured to provide HARQ feedback associated with the first PDSCH using a PUCCH/PUSCH occasion indicated by a second DCI scheduling the selected PDSCH.