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arXiv · 2310.03969

Analysis of Age of Information in Non-terrestrial Networks

Yanwu Lu·Howard Yang·Nikolaos Pappas·Giovanni Geraci·Chuan Ma·Tony Q. S. Quek
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Abstract

Non-terrestrial networks (NTN), particularly low Earth orbit (LEO) satellite networks, have emerged as a promising solution to overcome the limitations of traditional terrestrial networks in the context of next-generation (6G) wireless systems. In this paper, we focus on analyzing the timeliness of information delivery in NTN through the concept of Age of Information (AoI). We propose an on-off process to approximate the service process between LEO satellites and a source node located on the Earth's surface. By utilizing stochastic geometry, we derive a closed-form expression for the time-average AoI in an NTN. This expression also applies to on-off processes with one component following an exponential distribution while the other has its probability density function supported on a bounded interval. Numerical results validate the accuracy of our analysis and demonstrate the impact of source status update rate and satellite constellation density on the time-average AoI. Our work fills a gap in the literature by providing a comprehensive analysis of AoI in NTN and offers new insights into the performance of LEO satellite networks.

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Yanwu Lu, Howard Yang, Nikolaos Pappas, Giovanni Geraci, Chuan Ma, Tony Q. S. Quek. 2023-10-06. Analysis of Age of Information in Non-terrestrial Networks. https://arxiv.org/abs/2310.03969

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