Sidelink PRS Transmit Power Control with Pathloss and RSRP
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Solution Overview
Problem
Existing wireless communication systems, particularly in 5G NR, face challenges in efficiently managing power control for sidelink positioning reference symbols, which affect device-to-device communication and positioning accuracy.
Innovation Solution
A UE is configured to determine sidelink transmit power using sidelink open-loop power control based on downlink or sidelink pathloss, and estimates a referenced signal received power (RSRP) to calculate the sidelink transmit power for sidelink PRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sidelink open-loop power control is used for sidelink PRS transmission, then positioning accuracy is improved, but device complexity increases due to additional RSRP estimation and pathloss calculation requirements
Solution Approach 1:
The UE autonomously estimates RSRP and calculates pathloss using its own measurements and configurations without requiring additional network coordination or complex closed-loop control mechanisms. The UE self-determines transmit power based on open-loop parameters and measured channel conditions, reducing signaling overhead and system complexity while maintaining positioning accuracy
Solution Approach 2:
The network pre-configures power control parameters (P0, alpha, pathloss reference signals) for sidelink PRS transmission before the actual positioning process. This preliminary configuration allows the UE to perform straightforward RSRP estimation and pathloss calculation without real-time complex computations, reducing device complexity during active positioning operations
2Measurement precision
If sidelink transmit power is optimized for positioning reference symbols, then positioning accuracy is improved, but energy consumption increases due to additional power control computations
Solution Approach 1:
The power control mechanism applies computations only when sidelink PRS transmission is required for positioning operations, rather than continuously. The UE performs RSRP estimation and pathloss calculation selectively based on positioning needs, reducing unnecessary energy consumption while maintaining positioning accuracy when required
Solution Approach 2:
The UE uses its existing measurement capabilities and stored configuration parameters to autonomously determine transmit power without requiring additional network-assisted computations or real-time signaling exchanges. This self-service approach minimizes energy consumption by leveraging already-available data and simple local calculations
Data Source
AI summary
Apparatuses, systems, and methods for power control for sidelink positioning reference symbols, e.g., in 5G NR systems and beyond. A UE may determine a sidelink transmit power when transmitting a sidelink PRS. Additionally, the UE may determine that a sidelink open-loop power control is configured to use at least one of a downlink pathloss or a sidelink pathloss. Further, the UE may estimate a referenced signal received power (RSRP) and a pathloss and estimate a sidelink transmit power for the sidelink PRS based, at least in part on the sidelink open-loop power control, the pathloss, and the RSRP.