Sidelink PRS Signaling Structure for Adaptive UE Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing sidelink positioning reference signals (PRS) for accurate positioning in 5G/NR mobile communications, particularly in scenarios involving device-to-device (D2D) communication and varying network coverage.
Innovation Solution
A user equipment (UE) is equipped with a transceiver to transmit and receive sidelink SL PRS and SL control information, enabling the determination of resources for receiving the SL PRS based on received control information, thereby optimizing the signaling structure for improved positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If UEs use fixed resource allocation for SL PRS transmission and reception, then the system complexity is reduced, but positioning accuracy and adaptability to varying network conditions deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation for SL PRS where UEs can adjust time-frequency resources based on received SL control information from other UEs. This allows the system to adapt to varying network conditions and improve positioning accuracy while maintaining manageable complexity through standardized adjustment procedures.
Solution Approach 2:
The patent enables UEs to change resource allocation parameters (time resources, frequency resources) for SL PRS transmission and reception based on received control information. This parameter adaptation allows optimization of positioning measurements under different network conditions without requiring complex centralized resource management.
2Measurement precision
If UEs dynamically adjust SL PRS resources based on received control information, then positioning accuracy improves, but device complexity and processing requirements increase
Solution Approach 1:
The patent implements a feedback mechanism where UEs transmit SL control information containing resource allocation indicators to other UEs. Receiving UEs use this feedback information to determine appropriate resources for SL PRS reception, enabling adaptive positioning while distributing processing complexity across multiple UEs rather than concentrating it in a single device.
Solution Approach 2:
Each UE independently determines its own SL PRS transmission and reception resources based on received control information from other UEs. This self-service approach allows UEs to autonomously adapt their resource allocation without requiring complex centralized scheduling, reducing overall system complexity while maintaining positioning accuracy.
3Measurement precision
If SL PRS signaling uses detailed resource allocation information, then positioning precision improves, but loss of information and signaling overhead increase
Solution Approach 1:
The patent extracts only the essential resource allocation information needed for SL PRS operation into dedicated SL control information fields. By separating critical positioning-related resource indicators from other control data, the system achieves precise positioning with minimized signaling overhead, transmitting only the necessary information for resource determination.
Data Source
AI summary
Methods and apparatuses for a sidelink (SL) positioning reference signal (PRS) signaling structure in a wireless communication system. A method of operating a user equipment (UE) includes transmitting, to another UE, a first SL PRS and a first SL control information associated with the first SL PRS and receiving, from the other UE, a second SL control information associated with a second SL PRS. The method further includes determining, based on the second SL control information, resources for the second SL PRS and receiving the second SL PRS on the determined resources.