Sidelink Power Control Commands With Interference Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately controlling sidelink transmit power, leading to interference and reduced battery life due to static or inaccurately adjusted power settings, particularly in LTE D2D and NR V2X communications.
Innovation Solution
Implementing closed-loop transmit power control methods where UEs adjust their power based on interference measurements and receive power control commands, enhancing accuracy and reducing interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If static transmit power settings are used in sidelink communications, then device complexity is reduced, but interference increases and communication quality deteriorates
Solution Approach 1:
The patent implements closed-loop power control where the receiving UE measures interference from sidelink transmissions and sends power control commands back to the transmitting UE. This feedback mechanism enables dynamic power adjustment based on actual interference conditions, resolving the contradiction between reducing interference and maintaining simple device operation.
Solution Approach 2:
The system transitions from static power settings to dynamic power control where transmit power is continuously adjusted based on real-time interference measurements. The power control commands enable the transmitting UE to adapt its power level dynamically, achieving better interference management without requiring overly complex device architecture.
2Reliability
If transmit power is increased to maintain communication quality, then communication reliability is improved, but battery consumption increases
Solution Approach 1:
The patent implements dynamic power control where transmit power is adjusted in real-time based on interference measurements and power control commands. This allows the system to use high power only when necessary for maintaining communication reliability, while reducing power consumption during conditions that allow lower power operation, thus optimizing the trade-off between reliability and battery life.
Solution Approach 2:
The system changes the transmit power parameter dynamically based on measured interference conditions and received power control commands. By adjusting this key parameter according to actual channel conditions rather than using fixed high power settings, the system maintains communication reliability while minimizing unnecessary battery consumption.
3Use of energy by moving object
If transmit power is decreased to save battery life, then energy efficiency is improved, but interference measurement accuracy deteriorates
Solution Approach 1:
The receiving UE performs interference measurements and sends power control commands to the transmitting UE based on these measurements. This feedback loop ensures that even when transmit power is reduced for energy efficiency, the system maintains accurate awareness of interference conditions through the measurement and command exchange mechanism, resolving the contradiction between energy savings and measurement accuracy.
4Measurement precision
If closed-loop power control is implemented, then power control accuracy is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent implements closed-loop power control where the receiving UE measures interference and sends power control commands to the transmitting UE. This feedback mechanism achieves accurate power control by using actual measurements to guide power adjustments, while the implementation leverages existing communication protocols to minimize the increase in device complexity and signaling overhead.
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a source user equipment (UE) may transmit a first sidelink communication to a target UE. The source UE may receive, based at least in part on transmitting the first sidelink communication to the target UE, a transmit power control command for a second sidelink communication. The source UE may transmit the second sidelink communication using a transmit power determined based at least in part on the transmit power control command. Numerous other aspects are provided.