Visual Event Detection over AI-Edge LEO Satellites with AoI Awareness

TL;DR

This paper introduces a deep joint source-channel coding scheme for AI-enabled LEO satellite networks, enhancing visual event detection by transmitting only meaningful features, which improves accuracy and timeliness over traditional methods.

Contribution

It proposes a novel DJSCC-based downlink scheme optimized for semantic visual inference in AI-native LEO satellite networks, addressing link constraints and improving performance.

Findings

DJSCC achieves higher inference accuracy than SSCC.

DJSCC results in lower average AoMI, indicating fresher information.

The scheme ensures greater threshold compliance for timeliness.

Abstract

Non terrestrial networks (NTNs), particularly low Earth orbit (LEO) satellite systems, play a vital role in supporting future mission critical applications such as disaster relief. Recent advances in artificial intelligence (AI)-native communications enable LEO satellites to act as intelligent edge nodes capable of on board learning and task oriented inference. However, the limited link budget, coupled with severe path loss and fading, significantly constrains reliable downlink transmission. This paper proposes a deep joint source-channel coding (DJSCC)-based downlink scheme for AI-native LEO networks, optimized for goal-oriented visual inference. In the DJSCC approach, only semantically meaningful features are extracted and transmitted, whereas conventional separate source-channel coding (SSCC) transmits the original image data. To evaluate information freshness and visual event detection performance, this work introduces the age of misclassified information (AoMI) metric and a threshold based AoI analysis that measures the proportion of users meeting application specific timeliness requirements. Simulation results show that the proposed DJSCC scheme provides higher inference accuracy, lower average AoMI, and greater threshold compliance than the conventional SSCC baseline, enabling semantic communication in AI native LEO satellite networks for 6G and beyond.