Dynamic SL PRS Configuration via Initial Signal Feedback
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Solution Overview
Problem
In sidelink (SL) positioning for 5G New Radio (NR), there is a challenge in selecting the appropriate SL positioning reference signal (SL PRS) configuration when the SL PRS request is triggered by lower layer signaling, as the responding UE may not be aware of the desired configuration.
Innovation Solution
The proposed solution involves configuring the 'response' SL PRS by the responding UE to use the same or better configuration parameters as the 'initial' SL PRS transmission, indicated in the associated SCI transmission. This includes options such as mirroring or matching the initial configuration to ensure positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the responding UE uses default or pre-configured SL PRS configuration for dynamic triggering, then the device complexity is reduced, but the positioning accuracy deteriorates because the configuration may not match the initial transmission requirements
Solution Approach 1:
The SCI transmission includes configuration information about the initial SL PRS as feedback to the responding UE, enabling the responding UE to select an appropriate configuration for the response SL PRS based on the actual transmission parameters used
Solution Approach 2:
The system dynamically adjusts the SL PRS configuration parameters (bandwidth, comb size, number of symbols) based on the initial transmission characteristics, allowing the response configuration to match the actual deployment scenario rather than using fixed defaults
2Measurement precision
If multiple pre-configured SL PRS configurations are provided at the responding UE, then the positioning accuracy is improved, but the device complexity increases due to configuration selection burden
Solution Approach 1:
Instead of maintaining multiple different configurations, the system copies the configuration parameters from the initial SL PRS transmission (bandwidth, comb size, number of symbols) and uses them directly for the response, eliminating the need for multiple pre-configured options
Solution Approach 2:
The single configuration selection mechanism serves multiple purposes: it handles different initial transmission scenarios, adapts to varying positioning requirements, and simplifies the responding UE's configuration management while maintaining positioning accuracy
Data Source
AI summary
Embodiments of the invention provide for: receiving, from a user equipment, a request for a transmission of a response sidelink positioning reference signal; receiving, from the user equipment, an initial sidelink positioning reference signal; determining a configuration of the response sidelink positioning reference signal, at least partially based on a configuration of the initial sidelink positioning reference signal; and transmitting, to the user equipment, the response sidelink positioning reference signal.