HARQ Codebook Feedback for Candidate PDSCH Time Resources
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Solution Overview
Problem
In the context of new radio (NR), the introduction of a new downlink control information (DCI) format 1_2 for time domain resource allocation causes issues with determining the receiving occasion of a candidate PDSCH, leading to incomplete HARQ response feedback and reduced data transmission reliability.
Innovation Solution
A communication method that determines a candidate time domain resource set, which includes multiple time domain resource sets, to ensure comprehensive feedback information for all possible time domain resource positions, improving data transmission reliability and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing semi-static codebook determination process is used, then the process is simple and established, but the terminal device cannot determine the bit position for receiving occasions of candidate PDSCHs scheduled by DCI format 1_2, leading to incomplete HARQ response feedback
Solution Approach 1:
The patent segments the time domain resource allocation into different lists: a first time domain resource list for DCI format 1_0/1_1 and a second time domain resource list for DCI format 1_2. This segmentation allows the terminal to separately manage and determine bit positions for different DCI formats, ensuring complete HARQ feedback for all candidate PDSCHs while maintaining clarity in the determination process.
Solution Approach 2:
The patent introduces a new dimension to the codebook determination by incorporating time domain resource information from the second time domain resource list (specifically, the time domain resource allocation list for DCI format 1_2) into the bit position determination. This additional dimension ensures that receiving occasions for candidate PDSCHs scheduled by DCI format 1_2 are properly accounted for in the semi-static codebook, completing the HARQ feedback mechanism.
2Loss of information
If the terminal device uses only the first time domain resource list for codebook determination, then the process is straightforward, but time domain resource information from DCI format 1_2 is not referenced, causing incomplete feedback
Solution Approach 1:
The patent merges the first time domain resource list and the second time domain resource list into a unified determination process for the semi-static codebook. By combining both lists, the terminal device ensures that time domain resource information from DCI format 1_2 is referenced and integrated into the codebook determination, thereby achieving complete HARQ response feedback for all candidate PDSCHs without loss of information.
3Reliability
If the existing codebook process is maintained, then backward compatibility is preserved, but data transmission reliability is affected due to inability to feedback for new DCI format 1_2 scheduling
Solution Approach 1:
The patent makes the codebook determination process dynamic by adapting it to support both legacy DCI formats (1_0, 1_1) and the new DCI format 1_2. The terminal device dynamically selects and references the appropriate time domain resource lists based on the DCI format being processed, enabling the system to maintain backward compatibility while gaining adaptability to new scheduling mechanisms through the integrated second time domain resource list.
Data Source
AI summary
This application provides a communication method and apparatus, and relates to the field of communication technologies, to improve data transmission reliability and resource utilization. The method includes: After the terminal device determines a candidate time domain resource set, the terminal device determines, based on the candidate time domain resource set, a codebook to be fed back to a network device. The codebook includes feedback information of one or more physical downlink shared channels PDSCHs, and the one or more PDSCHs are transmitted by using a time domain resource position indicated by the candidate time domain resource set.