Ranging Signal Resource Region Division for V2X Position Accuracy
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Solution Overview
Problem
In wireless communication systems, especially in device-to-device (D2D) communication, there is a challenge in accurately calculating ranging information and position estimation for user equipment (UE) moving at fast speeds, particularly when interference between ranging signals and the complexity of vehicle-to-everything (V2X) communication increases position estimation errors.
Innovation Solution
A method where the UE determines a resource region based on geographical information and transmits ranging signals to a roadside unit (RSU), receiving a response signal to calculate ranging information, which includes distance and phase difference information, thereby minimizing interference and improving position estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ranging signals are transmitted without geographical resource region division, then transmission simplicity is maintained, but interference between ranging signals increases and position estimation accuracy deteriorates
Solution Approach 1:
The patent divides the available resource regions into multiple geographical resource regions based on geographical information (such as GPS coordinates). Each UE determines which geographical resource region it belongs to and transmits ranging signals only in that specific region. This segmentation of resources by geographical location reduces interference between ranging signals from different UEs while maintaining relatively simple determination procedures based on pre-configured geographical boundaries.
2Reliability
If ranging signals are transmitted using fixed resource regions, then interference cancellation is achieved, but adaptability to fast-moving UEs deteriorates
Solution Approach 1:
The patent enables UEs to dynamically determine their geographical resource region based on their current geographical information, which changes as they move. For fast-moving UEs, the system allows frequent updates of geographical location and corresponding resource region selections. This dynamic adaptation ensures that even rapidly moving UEs can maintain reliable interference cancellation by continuously aligning their transmissions with their current geographical position rather than using fixed resource regions.
3Measurement precision
If position information is calculated using signal exchange with RSU, then ranging information accuracy improves, but communication time increases
Solution Approach 1:
The patent performs preliminary actions by pre-configuring geographical resource regions and having UEs continuously monitor their geographical position (e.g., via GPS). When a UE needs to transmit ranging signals, it has already determined its current geographical resource region based on real-time location information, eliminating the need for lengthy negotiation or calculation procedures. The RSU also maintains pre-established knowledge of which resource regions correspond to which geographical areas, enabling rapid response and position calculation without extensive back-and-forth communication.
Data Source
AI summary
Various embodiments provide a method and an apparatus for calculating ranging information by a terminal in a wireless communication system. Specifically, disclosed are a method and an apparatus for calculating ranging information by a terminal, the method comprising the steps of: determining a resource region corresponding to geographic information of the terminal, on the basis of ranging resource information of a resource region set for each piece of geographic information, and transmitting a ranging signal for calculating ranging information in the determined resource region; receiving, from a road side unit (RSU) which has received the ranging signal, a response signal including information that is used as a basis for calculation of the ranging information; and calculating ranging information that is information on a distance to the RSU, on the basis of the response signal.