Energy-State Feedback for IoT Wireless Power Transfer Scheduling
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Solution Overview
Problem
Wireless communications systems face inefficiencies due to the use of resources for energy harvesting signals, which reduces the availability of resources for information transfer, particularly in IoT devices.
Innovation Solution
Implementing energy-state feedback mechanisms that allow IoT devices to opportunistically harvest energy when their energy level is above a threshold and request resources for scheduled wireless power transfer (WPT) when below the threshold, using backscattered signals to indicate energy states and reduce explicit resource scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If resources are allocated for transmitting energy harvesting signals, then wireless power transfer can be achieved, but the number of resources available for information communication is reduced
Solution Approach 1:
The patent combines energy harvesting and information communication into a unified resource allocation framework. The base station jointly schedules resources for both WPT signals and information signals, allowing energy harvesting and data transmission to share the same time-frequency resources rather than occupying separate dedicated resources, thereby resolving the contradiction between energy harvesting capability and information communication efficiency
Solution Approach 2:
The patent enables wireless signals to serve dual purposes: the same WPT signals that transfer energy can also carry information, and information signals can simultaneously enable energy harvesting at the receiver. This multi-functionality allows a single resource allocation to achieve both energy transfer and information communication goals, eliminating the need for separate dedicated resources for each function
2Reliability
If explicit resource scheduling is used for wireless power transfer, then reliable energy delivery can be ensured, but the complexity of resource management increases
Solution Approach 1:
The patent implements feedback mechanisms where the base station monitors the energy states of IoT devices and adjusts resource allocation dynamically. The base station receives information about device energy levels and uses this feedback to optimize WPT resource scheduling, ensuring reliable energy delivery while adapting to changing conditions without requiring complex predetermined scheduling schemes
Solution Approach 2:
The patent enables IoT devices to autonomously determine their energy harvesting needs and communicate them to the base station, which then automatically allocates appropriate WPT resources. This self-service approach reduces the complexity of centralized resource management by allowing devices to participate actively in their own resource scheduling decisions
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 increases the efficiency of wireless communications by minimizing resource allocation for energy harvesting, thereby enhancing the overall data transfer rate.
Implementation Method 1
The first wireless device may monitor for a second, backscattered signal indicating the energy state of the second wireless device
Implementation Method 2
a third signal distinct from the first signal and associated with harvesting energy
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. For instance, a first wireless device may transmit, to a second wireless device, a first signal for probing an energy state of the second wireless device. The first wireless device may monitor for a second, backscattered signal indicating the energy state of the second wireless device and may transmit, to the second wireless device, an indication of resources for harvesting energy based on monitoring for the second, backscattered signal. The first wireless device may transmit, to the second wireless device and over the resources, a third signal distinct from the first signal and associated with harvesting energy.