Sidelink Positioning Reference Signal Location Information Handling
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Solution Overview
Problem
Sidelink positioning in communication systems faces challenges in accuracy and resource utilization due to the lack of anchor UE location information in SL PRS transmissions, which affects the positioning of session-less target UEs and inefficient resource use.
Innovation Solution
A method where terminal devices detect the absence of location information in SL PRS transmissions and transmit indication information to the network, allowing the network to trigger anchor UEs to send location information with subsequent PRS, enhancing the availability of location information for absolute positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If anchor UEs transmit SL PRS without location information to reduce signaling overhead, then resource utilization is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent implements dynamic transmission of location information by anchor UEs based on receiving a request from the target UE. The system transitions from a static state where location information is either always transmitted or never transmitted to a dynamic state where it is transmitted only when needed. This resolves the contradiction by making the signaling overhead adaptive - reducing it when positioning is not required while ensuring it is available when positioning accuracy is needed.
Solution Approach 2:
The target UE autonomously determines when it needs positioning services and actively requests location information from anchor UEs rather than relying on continuous broadcasting. This self-service approach allows the target UE to control the signaling overhead, requesting location information only when positioning is required, thus improving resource utilization while maintaining positioning accuracy when needed.
2Measurement precision
If anchor UEs continuously transmit location information with SL PRS to improve positioning accuracy, then positioning accuracy is improved, but resource utilization deteriorates
Solution Approach 1:
Instead of continuous transmission of location information, the system uses periodic transmission triggered by requests from target UEs. Anchor UEs transmit location information at specific intervals or when triggered, rather than continuously. This periodic action maintains positioning accuracy when needed while significantly improving resource utilization by avoiding unnecessary continuous transmissions.
Solution Approach 2:
The system transmits location information partially - only when and where it is actually needed by target UEs, rather than excessively transmitting it continuously to all UEs. This partial action approach ensures positioning accuracy is maintained for requesting UEs while avoiding the excessive resource consumption that would result from universal continuous transmission.
3Device complexity
If SL PRS is transmitted without location information to simplify the protocol, then device complexity is reduced, but positioning functionality deteriorates
Solution Approach 1:
The SL PRS transmission mechanism is designed to be universal, supporting both positioning and non-positioning scenarios through a single protocol framework. The same basic SL PRS transmission can serve positioning purposes when location information is included or positioning-less purposes when it is excluded, making the protocol versatile without requiring separate mechanisms for different scenarios.
Solution Approach 2:
The system prepares for positioning functionality by establishing the capability to include location information in SL PRS transmissions, even if not always used. This preliminary preparation ensures that when positioning is needed, the functionality is already in place and can be activated by a simple request, maintaining adaptability without permanently increasing protocol complexity.
Data Source
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AI summary
Example embodiments of the present disclosure relate to sidelink positioning. In an example method, a terminal device detects a positioning reference signal (PRS) from a second terminal device and location information transmission associated with the PRS in case the location information was transmitted. The terminal device determines that the PRS is transmitted without location information of the second terminal device. The terminal device transmits, to a network device, indication information for indicating the PRS transmitted without the location information of the second terminal device. Sidelink positioning performance can be improved.