Dynamic DMRS Configuration for V2X Doppler Adaptation
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Solution Overview
Problem
The Doppler effect significantly impacts vehicle-to-X (V2X) communication due to high relative speeds between vehicles, leading to inefficiencies in demodulation reference signal (DMRS) insertion frequencies, which are either excessive for low-speed scenarios or insufficient for high-speed conditions, resulting in suboptimal resource utilization and communication reliability.
Innovation Solution
A communication method and device that dynamically set DMRS arrangement formats based on the vehicle's position, speed, and application conditions, using a storage unit to store candidate formats correlated with allocation types, application conditions, and frequencies, allowing the controller to select the most appropriate format to manage DMRS insertion efficiently, thereby adapting to varying speed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DMRS insertion frequency is increased to handle high-speed vehicle communication, then communication reliability under Doppler effect is improved, but resource overhead increases
Solution Approach 1:
The patent implements dynamic DMRS insertion by allowing the network to configure different DMRS insertion frequencies based on vehicle speed conditions. The system transitions from static to dynamic configuration, where the DMRS insertion frequency is adjusted according to the actual Doppler effect magnitude caused by vehicle speed, thereby optimizing the balance between communication reliability and resource overhead
Solution Approach 2:
The patent changes the parameter of DMRS insertion frequency from a fixed value to a configurable parameter that can be adjusted based on vehicle speed. By introducing speed-based parameter adjustment, the system adapts the DMRS insertion frequency to match the actual channel conditions, reducing unnecessary overhead in low-speed scenarios while maintaining reliability in high-speed scenarios
2Productivity
If DMRS insertion frequency is decreased to reduce resource overhead, then resource utilization is improved, but communication reliability deteriorates under high-speed conditions
Solution Approach 1:
The system dynamically adjusts DMRS insertion frequency based on vehicle speed conditions. In high-speed scenarios where Doppler effect is significant, the system increases DMRS insertion frequency to maintain communication reliability, while in low-speed scenarios it reduces insertion frequency to improve resource utilization
Solution Approach 2:
The patent introduces speed-based parameter adjustment where the DMRS insertion frequency is changed according to vehicle speed thresholds. This allows the system to optimize resource utilization by using lower insertion frequencies when Doppler effect is minimal, while maintaining reliability by increasing insertion frequency when vehicle speed exceeds thresholds
3Device complexity
If fixed DMRS insertion format is used for all scenarios, then system complexity is reduced, but adaptability to varying speed conditions deteriorates
Solution Approach 1:
The patent transforms the static DMRS insertion format into a dynamic one that adapts to vehicle speed conditions. The network configures different DMRS insertion frequencies based on reported vehicle speed, enabling the system to adapt to varying Doppler effects without requiring complex terminal-side decision-making algorithms
Solution Approach 2:
The patent introduces vehicle speed as an intermediary parameter that mediates between the terminal and the network for DMRS configuration. The terminal reports speed information to the network, which then determines the appropriate DMRS insertion frequency, simplifying the overall system architecture while achieving adaptability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively mitigates the Doppler effect in V2X communication by optimizing DMRS insertion frequencies, enhancing communication reliability and resource utilization across different speed scenarios while minimizing overhead, thus ensuring consistent performance in varying vehicular environments.
Implementation Method 1
communication between a communication device onboard a moving object and various other communication devices is called vehicle-to-X (V2X) communication
Implementation Method 2
vehicles are considered to travel at speeds of approximately 100 km/h. Accordingly, the influence of the Doppler effect on communication is a concern in V2X communication
Data Source
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AI summary
There is provided an electronic device including circuitry configured to control vehicle-to-X (V2X) communication based on an arrangement format of reference signals for channel estimation used for the V2X communication, and dynamically set the arrangement format for the reference signals.