Multiple-PDSCH DCI Format for CBG-Based HARQ-ACK Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting codebook group (CBG)-based operation with multiple-physical downlink shared channel (PDSCH) scheduling, particularly in frequency regimes above 52.6 GHz, where current protocols are not optimized.
Innovation Solution
A method for user equipment (UE) and base station to acquire and configure downlink control information (DCI) for multiple-PDSCH scheduling, determining CBG-based operation, and generating HARQ-ACK information bits based on sub-codebook association, minimizing downlink signaling overhead through conditional repurposing of DCI fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CBG-based operation is enabled with multiple-PDSCH scheduling, then spectral efficiency and reliability are improved, but downlink signaling overhead increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple sub-codebooks, where each sub-codebook corresponds to a specific PDSCH. This segmentation allows the UE to generate HARQ-ACK feedback more efficiently by associating each sub-codebook with its corresponding PDSCH, thereby reducing the overall signaling overhead while maintaining the benefits of CBG-based operation across multiple PDSCHs
Solution Approach 2:
The patent establishes preliminary associations between PDSCHs and their corresponding HARQ-ACK sub-codebooks through DCI configuration. By pre-defining these relationships, the system avoids the need for extensive dynamic signaling during actual data transmission, thus reducing downlink signaling overhead while enabling efficient CBG-based operation
2Adaptability or versatility
If multiple-PDSCH scheduling is implemented, then resource allocation flexibility is improved, but protocol complexity increases
Solution Approach 1:
The patent introduces dynamic indicators in the DCI format that allow the network to flexibly configure and switch between different HARQ-ACK sub-codebook association schemes. This dynamic capability enables the system to adapt to varying resource allocation requirements while keeping the protocol implementation manageable through standardized dynamic signaling mechanisms
Solution Approach 2:
The patent uses DCI fields as intermediaries to convey HARQ-ACK sub-codebook association information. These intermediary fields act as a bridge between the network's resource allocation decisions and the UE's HARQ-ACK feedback generation, simplifying the protocol complexity by providing a standardized interface for configuring multiple-PDSCH scheduling behaviors
3Productivity
If DCI format is optimized for CBG-based operation, then feedback efficiency is improved, but compatibility with existing protocols decreases
Solution Approach 1:
The patent designs the DCI format with multi-functional fields that can serve both traditional scheduling purposes and the new CBG-based HARQ-ACK sub-codebook association functions. By making these fields universal, the system achieves improved feedback efficiency through optimized DCI structure while maintaining compatibility with existing protocols through familiar field names and locations
Data Source
AI summary
Provided is a method for a user equipment (UE). The method comprises acquiring a downlink control information (DCI) configured for multiple-physical downlink shared channel (PDSCH) scheduling; determining, based on the number of PDSCHs scheduled by the DCI, whether a codebook group (CBG)-based operation is enabled for the scheduled PDSCHs; and determining, based on the number of PDSCHs scheduled by the DCI, a format of the DCI.