Sidelink HARQ-ACK Codebook Selection for Multi-Slot Reporting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The determination of a HARQ-ACK codebook corresponding to HARQ-ACK information in 5G V2X resource allocation mode 1 is not adequately addressed, particularly in scenarios where UE reports HARQ-ACK information for PSFCH reception in slots other than the designated slot n+k.
Innovation Solution
A method for user equipment to determine and report HARQ-ACK information based on configuration information, which can be provided by a base station or predefined, ensuring accurate reporting in accordance with configured HARQ-ACK codebooks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE reports HARQ-ACK information for PSFCH reception only in the designated slot n+k, then the HARQ-ACK reporting follows the specified timing rule, but the flexibility in reporting timing is limited and slots other than n+k cannot be utilized for reporting
Solution Approach 1:
The patent applies dynamics by allowing the UE to dynamically select between two reporting modes: reporting only in the designated slot n+k (following the timing rule) or reporting in multiple slots including slots other than n+k (utilizing all configured slots). This dynamic selection based on configuration enables flexibility in reporting timing while adapting to different operational scenarios.
Solution Approach 2:
The patent changes the parameter of reporting slot selection from a fixed rule-based approach to a configurable approach. By introducing configuration information that can indicate different reporting modes, the system transforms the static timing rule into a flexible parameter that can be adjusted based on network requirements and UE capabilities.
2Measurement precision
If the UE sets HARQ-ACK information bits to NACK for slots other than n+k, then the reporting follows the timing specification, but the accuracy and completeness of HARQ-ACK information is reduced when reporting in slots other than n+k
Solution Approach 1:
The patent changes the parameter of HARQ-ACK bit value from a fixed NACK assignment to a dynamic value selection. When the UE is configured to report in slots other than n+k, it can set the HARQ-ACK information bits to reflect the actual reception status (ACK or NACK) rather than defaulting to NACK, thereby maintaining accuracy while enabling multi-slot reporting capability.
3Productivity
If the UE utilizes all configured slots for HARQ-ACK reporting, then the reporting efficiency is improved, but the complexity of determining which slots to report in increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine which slots to use for HARQ-ACK reporting based on configuration information received from the network. The UE independently evaluates the configured slots and selects appropriate reporting opportunities without requiring complex network coordination for each reporting instance, thereby improving efficiency while managing complexity at the UE side.
Data Source
Figure 1~2
AI summary
According to the present invention, provided are a method performed by user equipment and user equipment. The method includes: acquiring configuration information related to a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook, the configuration information including a first HARQ-ACK codebook parameter, a second HARQ-ACK codebook parameter, and a third HARQ-ACK codebook parameter; and determining, according to the configuration information related to the HARQ-ACK codebook, a HARQ-ACK codebook type related to sidelink (SL) transmission, wherein if the second HARQ-ACK codebook parameter has been configured, the first HARQ-ACK codebook parameter is applied and the second HARQ-ACK codebook parameter is ignored, and if the third HARQ-ACK codebook parameter has been configured, the first HARQ-ACK codebook parameter is applied and the third HARQ-ACK codebook parameter is ignored.