UE Positioning Power Control with Sidelink Pathloss Feedback
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Solution Overview
Problem
Wireless communication networks face increased interference and congestion due to the growing demand for mobile broadband access, especially in densely co-located devices, affecting the accuracy of positioning determination in UEs.
Innovation Solution
Implement power control mechanisms for UEs and base stations to optimize transmit power for Uu and sidelink communications, using pathloss values, feedback, and resource allocation to improve signal quality and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs are densely co-located to meet growing demand for mobile broadband access, then network capacity and coverage are improved, but interference and congestion increase, degrading positioning accuracy
Solution Approach 1:
The patent changes the transmit power parameter dynamically based on pathloss calculations. Each UE determines its transmit power for positioning signals by calculating pathloss from received reference signals and applying a pathloss compensation factor, ensuring signals remain detectable despite dense deployment conditions
2Measurement precision
If transmit power is increased to improve positioning signal quality, then received signal quality improves, but interference to other UEs and network congestion increase
Solution Approach 1:
The patent applies local quality by allowing each UE to independently determine its own transmit power based on its specific pathloss conditions to the gNB and other UEs. This localized power control ensures each UE transmits at the minimum necessary power for its specific positioning requirements, rather than using a uniform high power level across all UEs
Solution Approach 2:
The patent implements feedback mechanisms where UEs report pathloss measurements to the gNB, and the gNB provides power control adjustments. This closed-loop feedback enables dynamic optimization of transmit power to maintain positioning accuracy while minimizing interference
3Measurement precision
If pathloss compensation factor is increased to improve positioning estimate accuracy, then positioning accuracy improves, but UE power consumption increases
Solution Approach 1:
The patent applies dynamics by making the pathloss compensation factor adjustable and configurable rather than fixed. The factor can be modified based on deployment scenarios, traffic conditions, and positioning requirements, allowing optimization of the balance between positioning accuracy and power consumption for different operational contexts
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support power control for positioning. A transmit (Tx) power of a user equipment (UE) for Uu or SL communication may be controlled (e.g., jointly controlled) by the UE or a base station. In a first aspect, the UE determines Tx power based on an SL pathloss value or feedback from another UE. In a second aspect, the UE is configured to adjust Tx power and a resource allocation (e.g., a number of symbols per SL positioning instance). In a third aspect, a base station is configured to receive or determine SL or Uu channel measurements, and signal the SL Tx power for the UE. In a fourth aspect, the base station indicates a scheme to be used by the UE to determine an SL Tx power. Other aspects and features are also claimed and described.