A HMM-based content forwarding strategy in LEO satellite system

Abstract

Using the low earth orbit (LEO) satellite technology to provide high capacity and high speed data service for the users, has been one of the most popular research hotspots in LEO satellite communication system. Whereas, the traditional researches in the field of satellite communication mainly focus on the optimization of channel resource allocation, which is based on the improvement of data transmission rate and reliability. Different from the traditional research, this paper considers the popularity of content in different earth station (ES) from the user's perspective. Then we optimize the channel resources allocation between LEO satellite and ESs, and among ESs simultaneously, under the premise of maximizing the content forwarding capacity of the LEO satellite. In particular, the content forwarding of LEO satellite is modeled as hidden Markov model (HMM), and an optimal content forwarding algorithm based on Viterbi is proposed. At the same time, a multi-domain channel resource allocation algorithm based on HMM (MCR-H) is proposed to optimize the LEO satellite communication system. Numerical results demonstrate the performance and advantage of our new scheme.