Single-DCI Multi-Slot PDSCH Scheduling for HARQ-ACK Codebooks
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Solution Overview
Problem
In wireless communication systems with high subcarrier spacing, the existing scheduling frameworks lead to inefficient resource utilization and increased overhead due to the need for frequent PDCCH monitoring, which results in wasted slots and increased UE power consumption, especially when multi-PUSCH or multi-PDSCH scheduling is employed.
Innovation Solution
Implement a single DCI format to schedule multiple slots or PDSCHs, using an indicator to determine the HARQ-ACK codebook by indicating the accumulative number of dynamically scheduled PDSCH transmissions and PDCCH monitoring occasions, allowing for flexible scheduling and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If frequent PDCCH monitoring is performed to support high subcarrier spacing, then scheduling responsiveness is improved, but resource utilization deteriorates and overhead increases
Solution Approach 1:
The patent segments the scheduling function by allowing a single DCI format to schedule multiple PDSCH transmissions across multiple slots, rather than requiring separate PDCCH monitoring for each slot. This segmentation approach reduces the frequency of PDCCH monitoring while maintaining scheduling responsiveness.
Solution Approach 2:
The DCI format is enhanced with multi-functionality to schedule multiple PDSCH transmissions across different slots using a single DCI message. This universal scheduling approach eliminates the need for frequent separate PDCCH monitoring, thereby improving resource utilization while maintaining scheduling speed.
2Speed
If frequent PDCCH monitoring is performed to support high subcarrier spacing, then scheduling responsiveness is improved, but UE power consumption increases
Solution Approach 1:
The scheduling function is segmented to allow one DCI format to cover multiple slots, reducing the frequency of PDCCH monitoring events. This segmentation directly reduces UE power consumption by minimizing the number of times the UE must wake up and monitor PDCCH while preserving scheduling responsiveness.
Solution Approach 2:
The single DCI format enables continuous scheduling across multiple slots without requiring repeated PDCCH monitoring. This continuity allows the UE to remain in a lower power state between scheduled transmissions while maintaining scheduling responsiveness through the extended validity of the single DCI format.
3Productivity
If multi-PDSCH scheduling is employed to improve resource utilization, then productivity is improved, but HARQ-ACK feedback determination complexity increases
Solution Approach 1:
The DCI format includes preliminary HARQ-ACK feedback indication information that pre-defines the HARQ-ACK codebook structure for multiple scheduled PDSCH transmissions. This preliminary action simplifies the UE's task by providing advance guidance on how to construct the HARQ-ACK codebook, reducing determination complexity while maintaining improved resource utilization from multi-PDSCH scheduling.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for determining a HARQ-ACK codebook for multi-slot PDSCH transmission. According to some embodiments of the disclosure, a method for wireless communications performed by a UE may include: receiving a first plurality of downlink control information (DCI) formats for scheduling a second plurality of physical downlink shared channel (PDSCH) transmissions on at least one serving cell of the UE; receiving the second plurality of PDSCH transmissions based on the first plurality of DCI formats; generating a HARQ-ACK codebook based on the indicators in the first plurality of DCI formats; and transmitting the HARQ-ACK codebook.