Full-Duplex UE Self-Interference Energy Harvesting
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) operating in full-duplex mode faces challenges in utilizing self-interference for energy harvesting due to the need for interference cancellation during simultaneous transmission and reception, which can disrupt reception and is unnecessary during uplink transmissions without downlink reception.
Innovation Solution
The UE refrains from applying interference cancellation and uses self-interference from uplink signals for energy harvesting by operating separate antenna panels for transmission and reception, performing beam sweeping to select directional beams that maximize received energy for harvesting, and reporting energy measurements to the base station for optimal beam configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interference cancellation is applied during full-duplex operation, then reception quality is improved, but energy harvesting capability deteriorates
Solution Approach 1:
The system dynamically switches between interference cancellation mode and energy harvesting mode based on operational conditions. When downlink reception is active, interference cancellation is applied to ensure reception quality. When downlink reception is inactive, the system transitions to energy harvesting mode to capture energy from self-interference, thus adaptively resolving the contradiction between reception quality and energy harvesting capability.
Solution Approach 2:
The system changes the processing parameter of the received signal based on operational state. In normal reception mode, the parameter is set to interference cancellation processing. In energy harvesting mode, the parameter is changed to energy extraction processing, allowing the system to optimize between reception quality and energy harvesting by adjusting the processing parameter according to current operational needs.
2Use of energy by moving object
If separate antenna panels are used for transmission and reception, then self-interference energy harvesting is enabled, but device complexity increases
Solution Approach 1:
The antenna system is segmented into separate transmit antenna panels and receive antenna panels. This segmentation enables the transmit panels to generate self-interference that can be harvested by the receive panels without interfering with normal reception operations. The segmentation allows independent optimization of each panel's function while enabling energy harvesting capability.
Solution Approach 2:
The separate antenna panels serve multiple functions: primary transmission function, primary reception function, and energy harvesting function. The receive antenna panels not only perform their primary reception function but also serve as energy harvesting antennas when operating in full-duplex mode without downlink reception, thus providing multi-functionality that justifies the increased device complexity.
3Use of energy by moving object
If beam sweeping is performed to maximize energy harvesting, then energy harvesting efficiency is improved, but communication time is consumed
Solution Approach 1:
Beam sweeping for energy harvesting optimization is performed in advance during periods when downlink reception is not occurring. By conducting the beam sweeping action preliminarily, the system identifies optimal beam configurations for energy harvesting before actual communication occurs, thus maximizing energy harvesting efficiency without consuming communication time during active data transmission periods.
Solution Approach 2:
The system performs beam sweeping periodically during idle periods or guard periods when downlink reception is not active. This periodic action allows the system to update energy harvesting beam configurations at appropriate intervals without continuously interrupting communication, thus balancing energy harvesting efficiency with communication time utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows the UE to power components and perform tasks using self-interference energy, extending battery life and reducing power consumption, while maintaining communication reliability and throughput by leveraging self-interference for energy harvesting during uplink transmissions without simultaneous downlink reception.
Implementation Method 1
the UE may use self-interference from the uplink signal at the second one or more antenna panels for energy harvesting
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. In some systems, a user equipment (UE) may operate in accordance with a full-duplex communication mode and may be scheduled for an uplink transmission without a simultaneous downlink reception. For example, the UE may actively operate both a first one or more antenna panels for transmission and a second one or more antenna panels for reception and, in scenarios in which the UE is performing an uplink transmission without simultaneously receiving a downlink transmission, the UE may use self-interference from the uplink transmission at the second one or more antenna panels for energy harvesting. For example, the UE may receive the self-interference associated with the uplink transmission at the second one or more antenna panels, may refrain from applying interference cancellation, and may instead use a received energy from the self-interference to power one or more components of the UE.