Pre-Configured PRS Transmission for Low-Delay Sidelink Positioning
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Solution Overview
Problem
Existing NR-V2X systems face challenges in efficiently transmitting positioning reference signals (PRS) for sidelink positioning, leading to transmission delays and suboptimal resource allocation, which affects positioning performance and reliability.
Innovation Solution
A method and apparatus for transmitting pre-configured PRSs through a sidelink channel, utilizing a physical sidelink feedback channel (PSFCH) for resource allocation, including request and response PRSs, with dynamic determination of V2X data resources and priority considerations to minimize transmission delay and improve positioning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If PRS transmission uses existing NR-V2X resource allocation methods, then resource allocation is possible, but transmission delay increases and positioning performance deteriorates
Solution Approach 1:
The patent pre-configures PRS transmission resources (time, frequency, and spatial parameters) before actual positioning operations. This allows UEs to have ready-to-use resource allocations, eliminating the need for dynamic resource request and allocation procedures during positioning, thereby reducing transmission delay while ensuring reliable positioning performance.
Solution Approach 2:
The patent introduces dynamic determination of V2X data resources based on positioning priorities. When positioning events occur, the system can dynamically select appropriate pre-configured resources or adjust resource allocations according to the urgency and priority of positioning tasks, optimizing the balance between response speed and positioning accuracy.
2Productivity
If PRS transmission uses dynamic resource allocation, then resource utilization improves, but transmission delay increases
Solution Approach 1:
The patent establishes pre-configured resource pools for PRS transmission before positioning operations begin. These pre-configured resources include multiple time-frequency-spatial configurations that can be quickly selected and activated based on positioning needs, avoiding the time-consuming dynamic allocation process while maintaining efficient resource utilization through selective activation of appropriate resources.
3Reliability
If multiple PRS resources are allocated for different positioning scenarios, then positioning performance improves, but device complexity increases
Solution Approach 1:
The patent segments PRS resources into distinct pre-configured sets, each optimized for specific positioning scenarios (e.g., different time-frequency-spatial configurations for different positioning accuracies or environments). This segmentation allows the system to select appropriate resource sets based on positioning requirements without managing all possible configurations simultaneously, reducing complexity while maintaining high positioning performance.
Solution Approach 2:
The patent employs parameter-based resource selection where pre-configured resource sets are defined by key parameters (time offsets, frequency shifts, spatial filters). By changing these parameters based on positioning scenarios rather than creating entirely new resource configurations, the system achieves adaptability across different positioning needs while maintaining manageable complexity through parameterized resource definitions.
Data Source
AI summary
The present invention relates to a pre-configured positioning reference signal (PRS) transmission method for sidelink positioning, and an apparatus therefor. A method for performing, by means of a positioning terminal, on-demand positioning in a new radio-vehicle to everything (NR-V2X) communication system, according to one aspect, comprises the steps of: transmitting a request PRS through a sidelink channel; receiving a response PRS corresponding to the request PRS from a neighboring terminal through the sidelink channel; receiving a measurement result corresponding to the request PRS from the neighboring terminal; and performing positioning on the basis of the response PRS and the measurement result, wherein the positioning terminal transmits, to the neighboring terminal, resource allocation information for transmission of the response PRS corresponding to the request PRS, and the measurement result may be received through a resource for V2X data transmission.