Scheduling Assignment Segmentation for V2X Latency
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Solution Overview
Problem
Current Vehicle-to-Everything (V2X) technologies in LTE Rel-14 face limitations in data transmission performance, particularly in delay and reliability, due to the legacy sub-frame structure and resource allocation methods in Vehicle-to-Vehicle (V2V) communications.
Innovation Solution
A new data transmitting method is introduced, where SA information is transmitted in a reduced time length using a first category of SA information, allowing for flexible time-frequency resource allocation and multi-antenna transmission modes, while maintaining compatibility with legacy systems through a second category of SA information, enabling improved resource utilization and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy LTE sub-frame structure is used for V2V transmission, then system compatibility is maintained, but transmission delay increases and reliability deteriorates
Solution Approach 1:
The patent segments SA information into two categories: first category SA information for scheduling data in the same sub-frame, and second category SA information for scheduling data in future sub-frames. This segmentation enables shorter transmission time for immediate data while maintaining legacy compatibility for other cases, thereby reducing transmission delay without compromising reliability.
Solution Approach 2:
The patent introduces dynamic resource allocation where the terminal can flexibly select between first category and second category SA information based on transmission requirements. This dynamic approach allows the system to adapt to varying delay and reliability needs, improving overall transmission performance while maintaining compatibility with legacy systems.
2Loss of time
If reduced time length SA information is used, then transmission delay is reduced, but system compatibility with legacy terminals deteriorates
Solution Approach 1:
The patent designs the SA information structure to serve multiple functions: first category SA information enables low-latency transmission for supporting terminals, while second category SA information ensures compatibility with legacy terminals. This multi-functionality allows the same system to accommodate both new and legacy requirements simultaneously.
Solution Approach 2:
The patent applies different SA information formats to different transmission scenarios: first category SA information is used when low delay is required and both terminals support it, while second category SA information is used for legacy compatibility. This localized application of different qualities ensures optimal performance for each scenario while maintaining overall system compatibility.
3Productivity
If flexible resource allocation is implemented, then transmission performance improves, but resource management complexity increases
Solution Approach 1:
The patent segments resource allocation into two distinct modes corresponding to the two SA information categories. This segmentation simplifies the management of flexible resource allocation by providing clear, separate procedures for different transmission scenarios, thereby improving transmission performance without excessively increasing management complexity.
Data Source
Figure 1A~1B
Figure 2A~2B
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AI summary
Disclosed in the present application are a data transmission method and terminal, the data transmission method comprising: a first terminal selects from a time frequency resource set of scheduling allocation SA information the time frequency resources of a first type of SA information; the first terminal sends the first type of SA information on the time frequency resources of the first type of SA information according to a first physical layer format and, on the basis of an indication of the first type of SA information, sends data associated with the first type of SA information according to a second physical layer format; the first SA information comprises time frequency resource indication information of the data associated with the first type of SA information.