HARQ-ACK Feedback Scheduling for Repeated Downlink Transmissions
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Solution Overview
Problem
Existing communication systems lack efficient methods for reporting feedback information in repetitive downlink transmissions, leading to unnecessary overhead and ambiguity in HARQ-ACK codebooks due to redundant feedback indications for repeated PDCCH and PDSCH transmissions.
Innovation Solution
Implementing separate groups of candidate offsets for transmissions that require feedback and those that do not, allowing the terminal device to generate feedback information based on these groups, and selectively include or exclude feedback indications to optimize the HARQ-ACK codebook.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback indications are generated for all downlink transmissions including repetitions, then complete feedback coverage is achieved, but feedback overhead increases due to redundant feedback for repeated transmissions
Solution Approach 1:
The patent extracts and removes redundant feedback indications for repeated downlink transmissions from the HARQ-ACK codebook. By identifying which transmissions require feedback and which are repetitions, the system selectively includes only necessary feedback indications, thereby reducing overhead while maintaining reliable feedback coverage for essential transmissions.
Solution Approach 2:
The patent segments the downlink transmissions into two categories: transmissions that require feedback indications and repeated transmissions that do not. This segmentation allows the terminal device to process and report feedback selectively, generating HARQ-ACK codebooks that include feedback only for the segmented transmissions that necessitate it, thus reducing overall feedback overhead.
2Device complexity
If a single group of candidate offsets is used for all transmissions, then implementation simplicity is maintained, but ambiguity arises in HARQ-ACK codebooks due to redundant feedback indications
Solution Approach 1:
The patent divides the single group of candidate offsets into two separate groups: a first group for transmissions requiring feedback and a second group for repeated transmissions. This segmentation eliminates ambiguity in HARQ-ACK codebook generation by clearly distinguishing which transmissions should generate feedback indications and which should not, thereby resolving information loss while maintaining manageable implementation complexity.
Solution Approach 2:
The patent applies different offset groups to different types of transmissions based on their local characteristics. By assigning the first group of candidate offsets to transmissions that require feedback and the second group to repeated transmissions, the system ensures that each transmission type receives the appropriate feedback handling, eliminating ambiguity while keeping the implementation structured and manageable.
3Reliability
If feedback indications are included for repeated transmissions, then complete transmission acknowledgment is achieved, but communication efficiency decreases due to unnecessary feedback reporting
Solution Approach 1:
The patent extracts and removes feedback indications for repeated downlink transmissions from the HARQ-ACK codebook. By identifying repeated transmissions and excluding their feedback indications, the system maintains reliable acknowledgment for essential transmissions while eliminating unnecessary feedback reporting, thereby improving communication efficiency without sacrificing transmission reliability.
Solution Approach 2:
The patent applies partial action by generating feedback indications only for the subset of downlink transmissions that require them, rather than generating feedback for all transmissions including repetitions. This partial feedback approach maintains sufficient reliability for essential transmissions while avoiding the excessive feedback overhead that would result from complete feedback generation, thus improving overall communication efficiency.
Data Source
AI summary
Embodiments of the present disclosure provide a solution for improving feedback information for transmissions with repetition in a communication system. In a method for communication, a terminal device can obtain a first group of candidate offsets for transmissions of a first type and a second group of candidate offsets for transmissions of a second type. The terminal device may receive, from the network device, scheduling information for scheduling a transmission in a first slot, the scheduling information comprising a target offset selected from the first group of candidate offsets, the target offset indicating a second slot associated with a feedback indication for the transmission. The terminal device may determine a set of slots based on the second slot and the first group of candidate offsets. The terminal device may transmit, to the network device in the second slot, a set of feedback indications for the set of slots. Embodiments of the present disclosure can optimize and improve the reporting of feedback information by the terminal device to the network device in the communication system.