HARQ-ACK Feedback Grouping for Multi-Slot PDSCH Scheduling
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Solution Overview
Problem
The challenge of efficiently supporting various services with different requirements in a wireless communication system, including reducing latency and efficiently transmitting data packets, is addressed by implementing a method for multi-slot scheduling and HARQ-ACK feedback.
Innovation Solution
The method involves dividing N PDSCH receptions into X PDSCH groups and transmitting HARQ-ACK information for each group in a slot determined by applying K1 based on the last PDSCH reception, using a DCI format that includes a PRI field for PUCCH resource determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCH receptions are scheduled in multi-slot scheduling, then data throughput is improved, but latency and complexity of HARQ-ACK feedback increase
Solution Approach 1:
The patent segments the N PDSCH receptions into multiple groups (first group and second group) with different HARQ-ACK feedback timings. The first group uses a first K1 value for earlier feedback, while the second group uses a second K1 value for later feedback, allowing differentiated latency handling for different data priorities
Solution Approach 2:
The patent dynamically selects different K1 values based on the group to which each PDSCH reception belongs. The DCI format indicates whether a PDSCH reception belongs to the first or second group, enabling flexible and adaptive HARQ-ACK feedback timing adjustment to balance throughput and latency requirements
2Productivity
If multiple PDSCH receptions are scheduled in multi-slot scheduling, then data throughput is improved, but device complexity increases
Solution Approach 1:
The patent divides N PDSCH receptions into distinct groups (first group and second group) where each group has predetermined HARQ-ACK feedback timing characteristics. This segmentation simplifies the feedback mechanism by establishing clear rules for each group rather than requiring complex individual processing of each PDSCH reception
Solution Approach 2:
The patent changes the K1 parameter value based on the PDSCH reception group. The first group uses a first K1 value while the second group uses a second K1 value, allowing the system to manage complexity through parameter differentiation rather than structural complexity
Data Source
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AI summary
A UE may: receive a DCI format that schedules N PDSCH receptions, where N>1; determine HARQ-ACK information bits for the N PDSCH receptions on the basis of the DCI format; and transmit the HARQ-ACK information on the basis of the HARQ-ACK information bits. The N PDSCH receptions may be divided into X PDSCH groups, where X<N, and HARQ-ACK information for each PDSCH group may be transmitted from a slot determined by applying K1 on the basis of the last PDSCH reception within the corresponding PDSCH group.