PSSCH Resource Element Determination for V2X Sidelink
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication, determining an optimal transport block size (TBS) for the physical sidelink shared channel (PSSCH) is challenging due to the need for accurate resource element (RE) allocation and overlapping transmission resources for control and data channels.
Innovation Solution
A method where a terminal device determines the number of REs for the PSSCH in a second resource by considering the first resource used for transmitting the physical sidelink control channel (PSCCH), and then calculates the TBS based on these REs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first resource for PSCCH transmission overlaps with the second resource for PSSCH transmission, then resource utilization is improved, but accurate determination of REs for PSSCH becomes difficult
Solution Approach 1:
The patent segments the overlapping resources by identifying and excluding REs occupied by PSCCH from the total REs in the second resource. This segmentation allows accurate determination of PSSCH REs by treating PSCCH and PSSCH resource allocation as separate, non-overlapping components within the same time-frequency resource pool.
Solution Approach 2:
The patent extracts and removes the REs occupied by PSCCH transmission from the total RE count of the second resource. By taking out the control channel resources from the data channel resource pool, the method ensures that TBS calculation for PSSCH is based solely on available data transmission REs, resolving the accuracy issue caused by resource overlap.
2Device complexity
If TBS is determined without considering overlapping resources, then calculation complexity is reduced, but transmission performance deteriorates
Solution Approach 1:
The patent performs preliminary identification of PSCCH REs before calculating TBS for PSSCH. By pre-determining which REs are occupied by control channel transmission, the method enables accurate TBS calculation that accounts for resource overlap, thereby improving transmission performance without adding significant computational complexity.
Solution Approach 2:
The patent applies local quality adjustment by modifying the TBS calculation specifically for regions where PSCCH and PSSCH resources overlap. Instead of uniformly simplifying the calculation across all resources, the method selectively adjusts RE counting in the overlapping portion to ensure accurate TBS determination while maintaining simplicity in non-overlapping regions.
Data Source
AI summary
A method for data transmission and a terminal device are provided. The method includes the following. A terminal device determines number of resource elements (REs) for a physical sidelink shared channel (PSSCH) in a second resource according to a first resource used for transmitting a physical sidelink control channel (PSCCH) and the second resource indicated by the PSCCH and used for transmitting the PSSCH, where the first resource at least partially overlaps with the second resource. The terminal device determines a TBS for the PSSCH according to the number of the REs for the PSSCH.