Sidelink Transmission Time Determination Using Control Information
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In Vehicle to Everything (V2X) systems, determining the transmission time of sidelink data is challenging due to inconsistencies in time unit sizes between downlink and sidelink, especially when both LTE and NR systems coexist, leading to difficulties in scheduling and data transmission.
Innovation Solution
A method where a terminal device receives first control information from a network device to determine the transmission time of sidelink data, using index values or offset values relative to specific boundaries, allowing it to synchronize data transmission across different communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE-V2X and NR-V2X systems coexist on sidelink with different time unit sizes, then multi-system compatibility is improved, but transmission time determination becomes complex and error-prone
Solution Approach 1:
The patent introduces a network device as an intermediary that sends first control information to the terminal device. This control information serves as a mediator that carries timing indication data, allowing the terminal to determine sidelink transmission time without directly handling the complexity of time unit size conversions between LTE and NR systems. The network device processes and standardizes the timing information before transmitting it to the terminal.
Solution Approach 2:
The patent changes the parameter representation by using index values or offset values relative to specific boundaries (such as downlink slot boundaries or radio frame boundaries) instead of absolute time unit measurements. This parameter transformation allows consistent timing indication across different time unit sizes, as the index/offset can be universally applied regardless of whether the underlying system uses LTE or NR time unit definitions.
2Adaptability or versatility
If downlink and sidelink use different time unit sizes, then flexibility in system configuration is improved, but synchronization accuracy deteriorates
Solution Approach 1:
The patent transitions from a one-dimensional absolute time measurement approach to a two-dimensional relative timing approach. Instead of specifying absolute transmission times that require conversion between different time unit sizes, the system uses relative indexing (index values) and relative positioning (offset values from boundaries). This dimensional change allows the same indication mechanism to work accurately across different time unit sizes, maintaining synchronization precision while preserving configuration flexibility.
3Adaptability or versatility
If multiple subcarrier spacings are supported on sidelink for NR-V2X, then adaptability to different service requirements is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal timing indication mechanism that can handle multiple subcarrier spacings through a single unified approach. The first control information format and the method of using index/offset values relative to boundaries are designed to be multi-functional, working equally well whether the sidelink uses 15 kHz, 30 kHz, or other subcarrier spacings. This eliminates the need for separate timing determination procedures for each subcarrier spacing configuration.
Data Source
AI summary
A data transmission method and a terminal device are disclosed, which may solve the data transmission problems of a sidelink when the size of a time unit of a downlink and the size of a time unit of the sidelink are not the same. The method includes that a terminal device receives first control information sent by a network device, and determines a sending time for sidelink data according to the first control information.