Sidelink PRS Triggering via SCI for Low-Latency V2X Positioning
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Solution Overview
Problem
The increasing demand for mobile broadband communication with enhanced reliability and lower latency, particularly in vehicle-to-everything (V2X) scenarios, poses challenges for existing radio access technologies, necessitating improved methods for sidelink communication and positioning reference signal (PRS) management.
Innovation Solution
A method and device for performing wireless communication that involve obtaining and triggering sidelink positioning reference signal (PRS) configurations, including receiving and transmitting sidelink control information (SCI) to facilitate efficient SL PRS transmission, utilizing devices with transceivers, processors, and memory to execute these operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink positioning reference signal (PRS) transmission is implemented to enhance positioning accuracy in V2X scenarios, then positioning reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring PRS resources, sequences, and parameters before actual positioning operations. The first device obtains PRS configuration information in advance, including PRS resource IDs, sequence IDs, time domain parameters, and frequency domain parameters, which are stored and ready for triggered transmission. This preparation reduces real-time processing complexity while maintaining positioning reliability.
Solution Approach 2:
The patent uses SCI (Sidelink Control Information) as an intermediary to manage PRS transmission. Instead of direct complex device-to-device coordination, the SCI message carries request information that triggers pre-configured PRS transmissions. This intermediary layer simplifies the interaction between devices by using standardized control channels to convey positioning requests and configuration updates.
2Measurement precision
If detailed PRS configuration information is transmitted to ensure accurate positioning, then measurement precision is improved, but information overhead increases
Solution Approach 1:
The patent segments positioning information into two parts: (1) PRS configuration information that is obtained and stored in advance, including resource IDs, sequence IDs, time domain parameters, and frequency domain parameters; and (2) Triggering request information that is transmitted via SCI when positioning is needed. This segmentation reduces immediate information overhead while ensuring measurement precision through pre-configured detailed parameters.
Solution Approach 2:
The first device obtains comprehensive PRS configuration information in advance, including all necessary parameters for accurate positioning measurements. This preliminary acquisition of detailed configuration data ensures that when positioning measurements are performed, the full precision information is available without requiring continuous transmission of all parameters, thus reducing ongoing information overhead.
3Use of energy by moving object
If SL PRS transmission is triggered on-demand to reduce unnecessary signaling, then energy efficiency is improved, but response time may increase
Solution Approach 1:
The patent applies preliminary action by pre-obtaining and storing PRS configuration information including resource allocations, sequence parameters, and transmission settings before they are needed. When a positioning request is received via SCI, the first device can immediately trigger PRS transmission using the pre-prepared configuration, minimizing the time delay while avoiding continuous transmission that would waste energy.
Solution Approach 2:
The patent implements on-demand PRS transmission triggered by received request information rather than continuous periodic transmission. This approach allows the device to transmit PRS signals only when positioning is actually required, improving energy efficiency while maintaining the ability to respond to positioning needs through the triggered mechanism.
Data Source
AI summary
Proposed are a method by which a first device performs wireless communication and a device supporting same. For example, the first device may obtain information related to PRS configuration. For example, the information related to the PRS configuration may include at least one of information about the ID of a PRS resource, information about the ID of a PRS sequence, information about the start slot of the PRS resource, or information about the start symbol of the PRS resource. For example, the first device may receive SCI containing request information about SL PRS transmission. For example, the first device may trigger the SL PRS transmission on the basis of the request information about the SL PRS transmission.