Sidelink Positioning Reference Signal Power Control via Transmitting UE Feedback
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Solution Overview
Problem
In sidelink communication, the near-far problem arises due to varying power levels of sidelink positioning reference signals (SL PRS) received by user equipment (UE), complicating location estimation and causing signal distortion, as there is no centralized entity to control transmit power and no agreed-upon introduction of multiple SL PRS resource sets.
Innovation Solution
The transmitting UE determines and communicates the transmission power differences between SL PRS resources to receiving UEs, allowing them to adjust configurations or ignore problematic resources, thereby maintaining accurate measurements and avoiding signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple SL PRS resources with different transmit powers are used, then positioning measurement capability is improved, but signal distortion and near-far problem worsen
Solution Approach 1:
The transmitting UE determines and communicates transmission power difference information to receiving UEs, creating a feedback mechanism that enables receivers to compensate for power variations and avoid signal distortion, thereby maintaining measurement accuracy across multiple PRS resources
Solution Approach 2:
The patent introduces transmission power difference information as a new parameter that is communicated between UEs, allowing receiving UEs to adjust their processing parameters to handle varying signal powers and prevent near-far problems
2Device complexity
If no centralized power control entity is used, then system complexity is reduced, but power level coordination worsens
Solution Approach 1:
Each UE autonomously determines and communicates its own transmission power difference information to receiving UEs, enabling distributed self-coordination without requiring a centralized control entity, thus maintaining measurement precision while reducing system complexity
Solution Approach 2:
The power control function is segmented from a centralized entity and distributed to individual UEs, where each transmitting UE independently determines and communicates its power characteristics, simplifying system architecture while maintaining coordination capability
3Measurement precision
If transmission power difference information is communicated, then measurement accuracy is improved, but information transmission overhead increases
Solution Approach 1:
The transmission power difference information is integrated into existing sidelink communication protocols and message structures, allowing the same communication infrastructure to serve both positioning and general data communication functions, thereby minimizing additional information overhead
Data Source
AI summary
A method including: determining at least one transmission power difference between at least two sidelink positioning reference signal resources; and, based upon the determining of the at least one transmission power difference, transmitting information regarding the determined at least one transmission power difference for use with a receiving user equipment.