Sidelink PRS Resource Pool Selection Using CBR Measurements
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Solution Overview
Problem
The increasing demand for mobile broadband communication and the need for enhanced reliability and low latency in wireless communication systems, particularly in sidelink (SL) communication, has led to challenges in managing resource pools effectively, especially in scenarios like vehicle-to-everything (V2X) communication, where direct links between UEs are established without base station intervention.
Innovation Solution
A method and device for performing wireless communication that involves obtaining configuration information for dedicated and common resource pools, measuring SL received signal strength indicator (RSSI) and channel busy ratio (CBR), selecting the common resource pool based on CBR measurements, and transmitting SL positioning reference signals (PRS) within this pool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SL PRS transmission is performed in dedicated resource pool, then positioning accuracy is improved, but resource utilization efficiency deteriorates due to separate resource pool management
Solution Approach 1:
The patent combines dedicated resource pool for SL PRS transmission and common resource pool for SL communication into a single unified resource pool. This merging eliminates the need for separate resource pool management while maintaining positioning accuracy by ensuring that SL PRS transmissions occur within the unified resource pool structure, thereby improving resource utilization efficiency without sacrificing positioning performance
2Productivity
If SL PRS transmission is performed in common resource pool, then resource utilization efficiency is improved, but positioning accuracy deteriorates due to interference from SL communication signals
Solution Approach 1:
The patent performs CBR measurement before selecting resources for SL PRS transmission within the unified resource pool. By preliminarily assessing the channel conditions and interference levels through CBR measurement, the system can proactively select appropriate time-frequency resources that minimize interference from SL communication signals, thereby maintaining positioning accuracy while utilizing the common resource pool for improved resource efficiency
Solution Approach 2:
The patent implements a feedback mechanism where CBR measurement results are used to dynamically adjust resource selection for SL PRS transmission. The system continuously monitors the channel busy ratio and uses this feedback information to adaptively choose transmission resources, ensuring that positioning signals are transmitted in less congested resource blocks, thus maintaining positioning accuracy while achieving efficient resource utilization
3Reliability
If CBR measurement is performed over dedicated resource pool, then positioning resource quality is improved, but measurement accuracy deteriorates due to limited resource pool size
Solution Approach 1:
The patent makes the unified resource pool serve multiple functions: it acts as both the dedicated resource pool for SL PRS transmission and the common resource pool for SL communication. This multi-functionality allows CBR measurement to be performed over the entire unified resource pool, providing a more comprehensive and accurate view of channel conditions while ensuring that positioning resources are of high quality, as the same pool is optimized for both positioning and communication purposes
Data Source
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AI summary
Provided are a method by which a first device performs wireless communication, and a device for supporting same. The method may comprise the steps of: acquiring configuration information related to a dedicated resource pool; acquiring configuration information related to a shared resource pool; measuring a sidelink (SL) received signal strength indicator (RSSI) for the dedicated resource pool or the shared resource pool across a channel busy ratio (CBR) measurement window; acquiring an SL CBR on the basis of the measurement; selecting the shared resource pool on the basis of the SL CBR; and performing SL positioning reference signal (PRS) transmission within the shared resource pool.