Terminal Device Speed Adaptation for LTE Doppler Mitigation
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Solution Overview
Problem
Conventional LTE systems face communication challenges due to the Doppler Effect when dealing with high-speed terminals, particularly in vehicle-to-everything (V2X) environments, where existing D2D communication techniques are not designed to handle fast-moving vehicles, leading to communication failures beyond a certain speed threshold.
Innovation Solution
The implementation of a speed announcement function using physical resource blocks (PRBs) to transmit speed information, allowing terminal devices to select appropriate transmission formats based on detected speeds, thereby compensating for Doppler shifts and ensuring reliable communication in high-speed scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LTE D2D communication techniques are used, then communication is reliable for stationary or low-speed terminals, but communication fails for high-speed terminals beyond a certain speed threshold due to the Doppler Effect
Solution Approach 1:
The patent applies dynamics by making the transmission format selectable and adaptable based on terminal speed. Instead of using a fixed transmission format, the system dynamically selects from multiple formats (first format for high speed, second format for low speed) according to the detected terminal speed, allowing the communication system to adapt to varying speed conditions and maintain reliability across different velocity ranges
Solution Approach 2:
The patent changes transmission parameters (format selection) based on the terminal speed parameter. By detecting the terminal's speed and selecting appropriate transmission formats with different robustness characteristics, the system adjusts communication parameters to compensate for Doppler effects at different speed levels, thereby extending reliable communication to high-speed terminals
2Reliability
If transmission format is selected based on terminal speed, then communication reliability is maintained for high-speed terminals, but device complexity increases due to speed detection and format selection mechanisms
Solution Approach 1:
The patent implements self-service by enabling the terminal device to autonomously detect its own speed and select the appropriate transmission format without requiring complex network coordination or external assistance. The terminal independently performs speed detection, format selection, and transmission, simplifying the overall system architecture while maintaining communication reliability
Solution Approach 2:
The patent segments the transmission formats into distinct types (first format with higher robustness for high speeds, second format for low speeds), allowing the terminal to select the appropriate segment based on its speed. This segmentation simplifies the decision-making process compared to continuously adjustable parameters, reducing device complexity while maintaining adaptability
3Adaptability or versatility
If multiple transmission formats with different robustness are used, then communication adapts to various speed conditions, but system complexity increases due to format management and selection protocols
Solution Approach 1:
The patent applies dynamics by implementing a speed-threshold-based format selection mechanism. The terminal detects its speed and dynamically switches between transmission formats based on whether the speed exceeds a predetermined threshold, providing adaptability to different speed conditions while using a relatively simple binary decision process rather than complex multi-parameter optimization
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 enables reliable wireless communication in high-speed environments by allowing terminal devices to adapt transmission formats according to detected speeds, effectively mitigating the impact of the Doppler Effect and ensuring continuous communication beyond conventional LTE system limitations.
Implementation Method 1
a transceiver operable to perform wireless communication
Implementation Method 2
Conventional LTE systems face communication challenges due to the Doppler Effect when dealing with high-speed terminals
Data Source
AI summary
A terminal device for use in a wireless telecommunications system includes: a transceiver operable to perform wireless communication with one or more other terminal devices according to the wireless communications system and to receive speed information from the one or more other terminal devices indicative of a physical speed of the one or more other terminal devices; and a controller configured to select a transmission format, for use in wireless communication by the transceiver, in dependence upon the speed information received from the one or more other terminal devices.