System and method for performing cooperative transmission to a receiving node by selecting cooperative nodes moving in 3D space

Physical Layer Security Cooperative Transmission System Suppressing Eavesdropping via Cooperative Node Count Optimization

This technology is a cooperative transmission system that collects location data of cooperative nodes moving in 3D space, calculates encryption rates based on the number of nodes selected by proximity, and determines the maximum value as the transmission encryption rate to enable joint data transmission.

While relay communication is expanding to eliminate signal blind spots, the open nature of wireless signals makes them vulnerable to eavesdropping. Existing physical layer security methods have limitations in real-world mobile environments, as they often require relays to send intentional jamming signals or necessitate prior knowledge of the eavesdropper's channel information.

This technology finds the optimal number of cooperative nodes with minimal computation by dividing the range of primary cooperative nodes into four segments and searching only those where the encryption rate increases. It lowers eavesdropping risks by transmitting at an encryption rate that accounts for maximum cooperative distance and node count without needing jamming signals. Applicable to drone/UAV relay networks, mobile repeaters, and tactical/disaster wireless networks, it ensures confidential data delivery while reducing the burden of base station expansion.

‍

‍

Key Features:

• A cooperative node communication unit that transmits location information of the cooperative transmission system and receives location information of first cooperative nodes located within a first distance
• A receiving node communication unit that sends a data transmission request to a receiving node and receives the receiving node's location information
• An encryption rate determination unit that selects the maximum value among encryption rates based on the maximum cooperative distance and the number of second cooperative nodes selected by proximity as the transmission encryption rate
• A configuration that divides four segments using one-fourth, one-half, and their sum of the first cooperative node count as boundaries to search for the maximum encryption rate in the selected segment

‍

This invention was developed with support from the Ministry of Education's research on energy hotspots based on 3D beamforming technology for wireless power transmission.

‍