Autonomous SL-PRS Transmission via Parameter Range Checks
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Solution Overview
Problem
Existing vehicular communication systems face challenges in efficient sidelink resource management, particularly in out-of-coverage scenarios where centralized entities may not be desirable, and dynamic sidelink positioning is necessary due to high-speed vehicle movements.
Innovation Solution
The proposed solution involves a wireless transmit/receive unit (WTRU) that can autonomously perform sidelink positioning and resource allocation, including determining the cast type associated with sidelink positioning, configuring sidelink positioning reference signals (SL-PRS), and dynamically controlling SL-PRS transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centralized entities are used for sidelink resource management, then resource allocation can be coordinated, but system complexity and latency increase in out-of-coverage scenarios
Solution Approach 1:
The patent enables WTRUs to autonomously perform sensing, resource selection, and SL-PRS transmission without centralized entity coordination. Each WTRU independently monitors resource pools, decodes SCI from other WTRUs, and selects resources based on local measurements, eliminating the need for centralized resource management in out-of-coverage scenarios.
Solution Approach 2:
The patent divides the sidelink communication system into autonomous WTRU entities that independently perform resource management functions. Each WTRU operates as an independent decision-making unit, segmenting the centralized control function into distributed autonomous units that can operate without central coordination.
2Measurement precision
If SL-PRS transmission is performed frequently, then positioning accuracy improves, but resource consumption and interference increase
Solution Approach 1:
The patent implements periodic SL-PRS transmission where WTRUs transmit positioning reference signals at configured intervals rather than continuously. The periodicity and timing of SL-PRS transmissions are determined based on positioning accuracy requirements, allowing the system to achieve necessary measurement precision while minimizing resource consumption through scheduled periodic transmissions.
Solution Approach 2:
The patent enables dynamic adjustment of SL-PRS transmission parameters including periodicity, power, and resource selection based on current positioning requirements and channel conditions. WTRUs can adaptively modify transmission frequency and resources to match actual positioning needs, optimizing the balance between accuracy and resource usage.
3Loss of time
If WTRUs perform autonomous sensing and resource selection, then latency is reduced, but positioning accuracy may deteriorate due to lack of centralized coordination
Solution Approach 1:
The patent implements feedback mechanisms where WTRUs exchange positioning measurements and resource selection information through SCI messages. Each WTRU provides feedback about its perceived resources and positioning measurements to other WTRUs, enabling distributed coordination that maintains positioning accuracy while preserving the low-latency benefits of autonomous operation.
Data Source
AI summary
A wireless transmit/receive unit, WTRU, receives a positioning request message from another WTRU (1402). The positioning request message indicates a request associated with one or more of a sidelink positioning reference signals, SL-PRS, transmission or a SL-PRS reception and indicates a range of one or more parameters associated with the SL-PRS transmission or reception; these parameters comprise one or more of SL-RSRP, angle of departure AoD, angle of arrival AoA, and a line of sight LOS/NLOS metric. The WTRU measures the one or more parameters indicated in the positioning request message (1404) and performs the SL-PRS transmission (1410) or the SL-PRS reception (1410) on the condition that the measured parameters are within the range indicated in the positioning request message (1408).