Sidelink PRS Resource Configuration for Collision-Free Positioning
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Solution Overview
Problem
Existing sidelink (SL) positioning systems face issues due to overlapping SL positioning reference signal (PRS) resources among different UE groups, leading to unsuccessful SL positioning or wastage of resources, as configurations do not consider the characteristics of the positioning groups, such as the number of UEs and their distances.
Innovation Solution
A method and apparatus for configuring SL PRS resources based on information related to the SL positioning group, allowing efficient transmission and reception of SL PRS between UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SL PRS resources are configured without considering positioning group characteristics, then resource allocation is simple, but SL positioning fails due to resource collision or unnecessary resource waste
Solution Approach 1:
The patent applies local quality by configuring SL PRS resources differently for different positioning group characteristics. Specifically, the symbol length of SL PRS resources is adjusted according to the distance between UEs in the positioning group: longer symbol lengths for larger distances and shorter symbol lengths for smaller distances. This localized adaptation ensures reliable positioning for each group without unnecessary resource waste, resolving the contradiction between positioning success rate and resource efficiency.
Solution Approach 2:
The patent implements dynamics by making the SL PRS resource configuration adaptive rather than static. The base station dynamically determines resource parameters (such as symbol length) based on reported positioning group characteristics including UE distances and group sizes. This dynamic configuration allows the system to maintain high positioning reliability while optimizing resource usage according to actual conditions, preventing both collision and waste.
2Adaptability or versatility
If SL PRS resources are configured to cover large distances, then positioning works for distant UEs, but resources are wasted for nearby UEs
Solution Approach 1:
The patent applies local quality by tailoring the SL PRS resource configuration to the specific distance characteristics of each positioning group. Instead of using a uniform configuration that covers maximum distance, the system configures symbol lengths appropriate to each group's actual distance requirements. This ensures adequate coverage for distant UEs while avoiding unnecessary resource consumption for nearby UEs, thus resolving the contradiction between adaptability and resource efficiency.
3Productivity
If multiple positioning groups use the same SL PRS resources, then resource utilization is high, but resource collision occurs and positioning fails
Solution Approach 1:
The patent applies segmentation by dividing the positioning group into sub-groups based on distance characteristics, and allocating different SL PRS resources to different sub-groups. This segmentation prevents resource collision between groups with different distance requirements while maintaining efficient resource utilization. Each segment receives appropriately configured resources, ensuring both high productivity and positioning reliability.
Data Source
AI summary
A method for performing wireless communication by a first device, and an apparatus supporting same are provided. The method may comprise the steps of: transmitting, to a base station, information related to a sidelink (SL) positioning group; receiving, from the base station, information related to an SL positioning reference signal (PRS) resource; and transmitting or receiving an SL PRS on the basis of the SL PRS resource, wherein the SL PRS is a reference signal for positioning performed between multiple devices in the SL positioning group, and the SL PRS resource is configured on the basis of the information related to the SL positioning group.