RSU-Assisted D2D Ranging for Fast-Moving V2X Positioning
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Solution Overview
Problem
In wireless communication systems, especially in device-to-device (D2D) communication, there is a challenge in accurately acquiring ranging information by user equipment (UE) from a road side unit (RSU) for precise positioning, particularly in vehicle-to-everything (V2X) scenarios, where traditional methods may fail due to fast movement and short time requirements for position measurement.
Innovation Solution
A method where the UE receives a ranging signal from the RSU, determines a feedback signal resource region based on geographical information, and transmits a feedback signal to the RSU, which responds with ranging information, including its own and other UEs' positioning data, allowing for precise UE positioning and peripheral status identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ranging methods are used in D2D communication, then the system is simpler to implement, but positioning accuracy deteriorates in fast-moving V2X scenarios
Solution Approach 1:
The patent segments the feedback signal transmission by dividing the system into multiple RSUs (Road Side Units) distributed along the road. Each RSU independently transmits ranging signals and receives feedback signals from UEs in its coverage area. This segmentation allows the system to handle fast-moving vehicles more accurately by having multiple measurement points along the trajectory, thereby improving positioning accuracy without requiring each individual RSU to be overly complex.
Solution Approach 2:
The patent introduces RSUs as intermediary nodes between UEs and the positioning system. These RSUs act as mediators that transmit ranging signals to UEs and collect feedback signals, enabling accurate positioning in V2X scenarios without requiring direct complex interactions between UEs. The RSUs serve as stable reference points that facilitate precise ranging measurements even when UEs are moving rapidly.
2Measurement precision
If feedback signals are transmitted without geographical information-based resource determination, then resource allocation is simpler, but positioning accuracy and peripheral status identification deteriorate
Solution Approach 1:
The patent applies local quality by determining feedback signal transmission resources based on the geographical information of each UE. Specifically, the resource selection depends on the UE's location relative to RSUs, with different resource patterns assigned to different geographical areas. This allows the system to optimize positioning accuracy for each local area while managing overall resource allocation through standardized rules, thereby improving measurement precision without excessive complexity.
Solution Approach 2:
The patent implements preliminary action by pre-defining resource patterns for feedback signal transmission based on geographical information. The UE determines its location and selects the appropriate pre-configured resource pattern in advance, rather than dynamically negotiating resources in real-time. This preliminary resource allocation based on geography improves positioning accuracy while reducing the complexity of on-the-fly resource management.
3Measurement precision
If ranging information is not acquired from response signals, then communication overhead is reduced, but positioning accuracy and peripheral status identification worsen
Solution Approach 1:
The patent merges multiple functions into the response signal: it carries both ranging information (for positioning accuracy) and information about other peripheral UEs (for status identification). By combining these information types into a single communication exchange, the system achieves high measurement precision and comprehensive status awareness without proportionally increasing communication overhead, as both information types are transmitted together in the same signal.
Solution Approach 2:
The response signal is designed with multi-functionality, serving both to provide ranging information for positioning accuracy and to convey peripheral UE status information. This universal approach allows a single communication mechanism to fulfill multiple objectives, improving positioning accuracy and environmental awareness without requiring separate dedicated communication channels for each function, thereby managing overhead efficiently.
Data Source
AI summary
Various embodiments provide a method and an apparatus for acquiring ranging information by a terminal in a wireless communication system supporting device to device (D2D) communication. Specifically, disclosed are a method and an apparatus for acquiring ranging information by a terminal, the method comprising the steps of: receiving, from a road side unit (RSV), a ranging signal including location information of the RSU; transmitting a feedback signal to the RSU, in a resource region determined on the basis of geographic information of the terminal; and receiving a response signal from the RSU, as a response to the feedback signal, and acquiring ranging information on the basis of the received response signal, wherein the response signal further includes ranging information of another terminal which has received the ranging signal and transmitted a feedback signal.