Analysis and Optimization of Age of Information and Age of Leaked Information for IoT Networks

Motivated by age of information (AoI), we introduce the age of leaked information (AoLI) to characterize the freshness of information eavesdropped by an unintended receiver (UR). To ensure that the intended receiver acquires the fresh information while preventing UR from overhearing, a multi-objective optimization problem is formulated to jointly minimize the time-averaged AoI and maximize the time-averaged AoLI. By modeling their evolution as Markov chains, the theoretical AoI and AoLI are analyzed to derive the closed-form optimal transmit and jamming power. Simulation results unveil the inherent tradeoff between the AoI and AoLI.