Dynamic PUCCH Codebook Mapping for Flexible Multi-Slot Feedback
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Solution Overview
Problem
Existing wireless communication systems face limitations in flexible PUCCH repetition due to restrictions that ensure the same payload and coded bits are transmitted across different PUCCH repetitions, leading to inflexible feedback mechanisms.
Innovation Solution
A dynamic codebook approach is introduced, allowing feedback information to be transmitted across multiple PUCCH slots with varying payloads, using Downlink Assignment Indicator (DAI) values to determine feedback bit locations and ordering, enabling flexible feedback reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same payload and coded bits are transmitted across different PUCCH repetitions to ensure reliability, then the reliability of feedback transmission is improved, but the adaptability and flexibility of the feedback mechanism deteriorates
Solution Approach 1:
The patent implements dynamic PUCCH repetition where the payload can vary across repetitions. The first PUCCH repetition contains a first payload with feedback information, while the second PUCCH repetition contains a second payload that may differ from the first. This dynamic approach allows the system to adapt feedback content to different transmission conditions while maintaining reliability through repeated transmissions.
Solution Approach 2:
The system changes the payload parameter across PUCCH repetitions. Instead of maintaining identical payloads, the patent allows the feedback information content to vary between repetitions based on downlink assignments and DAI values. This parameter change enables flexible adaptation while preserving the reliability benefit of repetition.
2Device complexity
If feedback information is transmitted with fixed payload structure across multiple PUCCH slots, then the device complexity is reduced, but the productivity and communication efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic payload construction for PUCCH repetitions based on DAI values and downlink assignments. The feedback information is organized into codebooks that can vary in content and structure across repetitions, enabling more efficient use of uplink resources while maintaining manageable device complexity through standardized procedures.
Solution Approach 2:
The patent uses DAI (Downlink Assignment Indicator) values as intermediaries to manage feedback information across multiple PUCCH repetitions. The DAI values enable the UE to determine which feedback information to include in each repetition without requiring complex autonomous decisions, thus improving communication efficiency while keeping device complexity reasonable.
3Adaptability or versatility
If varying payloads are transmitted across multiple PUCCH repetitions to improve flexibility, then the adaptability of feedback reporting is improved, but the device complexity increases
Solution Approach 1:
The patent segments feedback information into distinct codebooks (first codebook, second codebook, third codebook) that can be selectively transmitted across PUCCH repetitions. Each codebook contains specific feedback information associated with different downlink assignments, allowing flexible adaptation while managing complexity through structured organization of feedback elements.
Solution Approach 2:
The DAI values serve as intermediaries that simplify the management of varying payloads across PUCCH repetitions. By using DAI values to indicate which feedback information should be included in each repetition, the patent reduces the complexity of payload management while maintaining high adaptability in feedback reporting.
4Loss of time
If feedback information is mapped to multiple PUCCH slots with different payloads, then the loss of time for feedback transmission is reduced, but the difficulty of detecting and measuring feedback information increases
Solution Approach 1:
The patent segments feedback information across multiple PUCCH slots with different payloads, allowing parallel or sequential transmission of different feedback elements. This segmentation reduces the time required to convey comprehensive feedback information while using standardized codebook structures and DAI indicators to maintain manageable detection complexity at the gNB side.
Solution Approach 2:
The DAI values act as intermediaries that facilitate the detection and measurement of feedback information across multiple PUCCH slots. By providing clear indicators of which feedback information is present in each repetition, the DAI mechanism reduces the complexity of detecting and interpreting varying payloads while enabling timely feedback transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A wireless communications system may support transmission of feedback information for downlink data information in multiple feedback payloads across multiple uplink channel slots. A user equipment (UE) may transmit an acknowledgement for a downlink shared channel message in multiple feedback payloads across multiple different uplink control channel transmission occasions, the payloads being different. For a given downlink shared channel message, a UE may report associated feedback in two or more uplink control channel transmission occasions. The payloads reported in the two or more uplink control channel transmission occasions may be overlapping (e.g., have at least one feedback bit in common) but not the same. The UE may generate the feedback payloads based on downlink assignment indicator (DAI) values indicated by downlink control information (DCI) that schedules a downlink channel transmission.