Sidelink Control Information Resource Mapping for V2X
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Solution Overview
Problem
Current LTE and NR sidelink technologies face challenges in supporting advanced V2X services due to limitations in sidelink control information (SCI) design, particularly in broadcast mode, which affects performance and complexity in detecting SCI of different sizes, and lack of specific design for sidelink feedback control information (SFCI) transmission.
Innovation Solution
The method involves transmitting sidelink control information (SCI) and target control information according to a resource mapping pattern that indicates transmission resources for the physical sidelink shared channel (PSSCH), allowing for efficient scheduling and improved performance by using a resource mapping pattern that considers various parameters such as DMRS location, transmission configuration, and service type.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SCI for broadcast is padded with 0 or 1 to reach the size of SCI for unicast/groupcast, then the size of SCI is unified, but performance of the SCI for broadcast is reduced
Solution Approach 1:
The patent applies dynamic SCI size adjustment based on transmission mode. For broadcast mode, SCI uses a smaller size without padding, while for unicast and groupcast modes, SCI uses a larger size. The receiving terminal dynamically adapts to different SCI sizes based on the detected transmission mode, avoiding performance degradation from unnecessary padding while maintaining size uniformity when needed.
2Reliability
If SCI for broadcast is not padded, then SCI performance is maintained, but complexity in detecting SCI of different sizes by a receiving end is increased
Solution Approach 1:
The patent introduces transmission mode as an intermediary that guides the detection process. The receiving terminal first identifies the transmission mode (broadcast, unicast, or groupcast) before detecting SCI. This intermediary step allows the terminal to adapt its detection strategy to the appropriate SCI size, reducing detection complexity while maintaining SCI performance.
3Reliability
If HARQ feedback mechanism is supported in unicast and groupcast, then communication reliability is improved, but SCI size becomes much greater than SCI for broadcast transmission
Solution Approach 1:
The patent applies local quality by configuring different SCI sizes and features for different transmission modes. Unicast and groupcast modes, which require high reliability, are configured with larger SCI that includes HARQ feedback mechanisms. Broadcast mode, which has different requirements, uses smaller SCI without HARQ feedback. This localized optimization ensures each transmission mode has appropriately sized SCI tailored to its specific needs.
Data Source
AI summary
An information transmission method and a terminal are provided. The method includes: transmitting sidelink control information SCI and target control information according to a resource mapping pattern; where the resource mapping pattern is used to indicate transmission resources for a physical sidelink shared channel PSSCH scheduled by the SCI and for the target control information, and the target control information is next-stage SCI or sidelink feedback control information SFCI.