# Secrecy Outage for Wireless Sensor Networks

## TL;DR

This paper investigates the impact of outdated channel information on the secrecy outage probability in wireless sensor networks, proposing sensor scheduling methods to improve physical layer security under Weibull fading.

## Contribution

It derives analytical expressions for secrecy outage probability considering outdated CSI and compares scheduling schemes, providing practical insights into security performance.

## Key findings

- Outdated CSI increases secrecy outage probability.
- Sensor scheduling can mitigate security degradation.
- Theoretical results are validated by simulations.

## Abstract

This paper addresses Physical Layer Security (PLS) for a wireless sensor network in which multiple sensor nodes communicate with a single sink in the presence of an eavesdropper. Under the assumption of sink using outdated channel state information (CSI) of the eavesdropper link, the outage probability of achievable secrecy rate under Weibull fading is investigated and its analytical expressions are derived. Specifically, we consider sensor scheduling to enhance PLS, thereby we quantify the degradation in outage probability due to outdated CSI under the best-node scheduling scheme and compare it with conventional round-robin scheduling. Finally, we analyze secrecy outage probability conditional on successful transmission and provide practical insights into the effect of outdated CSI of the eavesdropper. The derived theoretical results are validated through simulations.