Wireless Powered Network Time Allocation for Physical-Layer Security
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless powered communication networks lack effective methods for allocating transfer times to minimize information exposure between a hybrid access point and a user when a tapper is present, compromising physical-layer security.
Innovation Solution
A low-complexity method for allocating energy transfer and information transfer times using an energy harvesting jammer, which involves obtaining necessary channel state and distribution information to calculate optimal transfer times that minimize secrecy outage probability, ensuring physical-layer security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optimal time allocation technology is used to maximize information transfer, then information transfer efficiency is improved, but physical-layer security deteriorates due to lack of consideration for tapper presence
Solution Approach 1:
An energy harvesting jammer is introduced as an intermediary device to protect the communication between the user and H-AP. The jammer harvests energy from the H-AP's transmission and uses it to generate jamming signals that prevent tappers from eavesdropping, thus resolving the security issue without significantly impacting information transfer efficiency
Solution Approach 2:
The patent modifies the time allocation parameters by introducing a new parameter τ (eta) representing the fraction of time dedicated to energy transfer for jammer operation. By optimizing this parameter along with the information transfer time (1-τ), the system achieves both security and efficiency goals, transforming the security problem into a parameter optimization problem
2Reliability
If security measures are implemented to protect against tappers, then physical-layer security is improved, but system complexity increases
Solution Approach 1:
The jammer operates autonomously by harvesting energy directly from the H-AP's transmission signals and using this harvested energy to generate jamming signals. This self-service mechanism eliminates the need for external power sources or complex power management systems, keeping the overall system complexity low while providing effective security
Solution Approach 2:
The system recovers and reuses the energy transmitted by the H-AP. Instead of letting the energy go to waste or be used only for legitimate communication, the jammer harvests this energy and repurposes it for security functions, creating a resource-efficient security mechanism without adding significant complexity
3Productivity
If energy transfer time is increased to provide more energy for information transfer, then information transfer capability is improved, but secrecy outage probability increases due to extended exposure time
Solution Approach 1:
The patent implements a periodic time allocation scheme where the communication process alternates between energy transfer phases and information transfer phases. During energy transfer time τ, the jammer is charged; during information transfer time (1-τ), the jammer is activated. This periodic switching allows the system to achieve both goals by properly timing the jammer's operation to coincide with information transfer
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
The method provides efficient physical-layer security in wireless powered communication networks with low complexity, effectively minimizing secrecy outage probability and enhancing information security, as demonstrated by performance comparisons with other technologies.
Implementation Method 1
a hybrid access point (H-AP) may transmit an energy signal during a first energy transfer (ET) time, and the user may use the signal to perform energy harvesting (EH)
Implementation Method 2
transmitting, to a tapper, jamming signals based on the harvested energy during the information transfer operation
Data Source
AI summary
The present invention relates to a method for allocating transfer times of a low degree of complexity for improving physical-layer security in a wireless powered communication network. A method for allocating transfer times in a wireless powered communication network according to an embodiment of the invention can provide a low-complexity method of allocating transfer times that enables physical-layer security in a secure wireless powered communication network (WPCN) using an energy harvesting jammer, and this method can be utilized to establish an energy harvesting communication system that is efficient in terms of information security.