Security- and Reliability-Guaranteed Transmission Control of Time-Sensitive Physical Layer Security Systems

Area of Science:

• Information Theory
• Wireless Communications
• Network Security

Background:

• Physical layer security is crucial for secure information transmission.
• Imperfect channel estimations pose challenges in wireless systems.
• Balancing security and reliability requires advanced transmission strategies.

Purpose of the Study:

• To propose an SNR-gated transmission control scheme for a three-node physical layer security system.
• To reduce outage and interception probabilities by controlling transmissions based on channel conditions.
• To analyze the trade-off between security metrics and network timeliness (Peak Age of Information).

Main Methods:

• Developed an SNR-gated transmission control scheme based on imperfect main and eavesdropping channel estimations.
• Defined transmission rules: halt if main channel gain is too low (avoid outage) or too high (avoid interception).
• Derived explicit expressions for outage probability, interception probability, and Peak Age of Information (PAoI) violation probability.

Main Results:

• The proposed SNR-gated scheme effectively reduces both outage and interception probabilities.
• Numerical and Monte Carlo simulations validate the performance improvements.
• Demonstrated a method to investigate the trade-off among security and timeliness probabilities.

Conclusions:

• The SNR-gated transmission control is an effective strategy for enhancing physical layer security.
• The scheme provides a practical approach to mitigate security risks in wireless networks.
• Further analysis can optimize the trade-offs for specific network requirements.