Wireless UE Feedback Codebook Segmentation for DAI Scheduling
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Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in feedback mechanisms when scheduling multiple downlink data resources, leading to misalignment and wasted feedback bits due to the introduction of Downlink Assignment Index (DAI) fields, which increase DCI overhead and misalign feedback codebook sizes between user equipment and base stations.
Innovation Solution
The proposed solution involves generating sub-codebooks for different types of scheduling indicators, combining them to form a comprehensive codebook that accurately reflects the reception status of multiple downlink transmissions, thereby optimizing feedback efficiency and reducing DCI overhead by independently counting and cascading feedback bits for Type 1 and Type 2 DCIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If DAI fields are introduced to schedule multiple downlink data resources, then scheduling capability is improved, but DCI overhead increases and feedback codebook misalignment occurs
Solution Approach 1:
The feedback codebook is segmented into multiple sub-codebooks, where each sub-codebook corresponds to a specific DAI value or range of DAI values. This segmentation allows the system to handle multiple downlink data resources scheduled by different DAI values without requiring a single large codebook, thereby reducing feedback overhead and avoiding misalignment issues while maintaining the ability to schedule multiple resources efficiently
2Adaptability or versatility
If DAI fields are introduced to schedule multiple downlink data resources, then scheduling capability is improved, but feedback codebook misalignment occurs
Solution Approach 1:
The system performs preliminary actions by pre-defining the structure and size of each sub-codebook before feedback transmission. The base station and user equipment both know the mapping between DAI values and specific sub-codebooks in advance, which ensures that feedback information is correctly generated and interpreted without misalignment, thereby maintaining feedback consistency and reliability while enabling multiple resource scheduling
3Loss of information
If feedback codebook size is increased to accommodate multiple transmissions, then feedback completeness is improved, but feedback overhead increases
Solution Approach 1:
Instead of using a single large feedback codebook to accommodate all transmissions, the system segments the feedback into multiple smaller sub-codebooks, each associated with specific DAI values. This segmentation maintains feedback completeness by ensuring all necessary acknowledgments are transmitted while reducing overall overhead through efficient resource allocation and avoidance of redundant feedback bits
Solution Approach 2:
The system transmits only the necessary sub-codebooks containing feedback information for actually scheduled transmissions, rather than transmitting a complete large codebook for all possible transmissions. This partial action approach maintains feedback completeness for scheduled resources while reducing overhead by excluding unnecessary feedback bits for unscheduled resources
Data Source
AI summary
In various arrangements, a User Equipment (UE) receives at least one of first scheduling indicators and second scheduling indicators. Each of the first scheduling indicators schedules a transmission. The transmission scheduled by each of the first scheduling indicators is a first transmission type or a second transmission type. Each of the second scheduling indicators schedules two or more of the transmissions. Each transmission scheduled by a second scheduling indicator is the first transmission type or the second transmission type. The UE generates one or more sub-codebooks according to one or more of the first scheduling indicators, the second scheduling indicators, the first transmission type, and the second transmission type. The UE generates a codebook by combining the generated one or more sub-codebooks.