Double-layered Satellite Network Research Articles

Swarm and Location-Based QoS Routing Algorithm in MEO/LEO Double-Layered Satellite Networks

In this paper, we mainly research on the QoS (Quality of Service) routing algorithms for MEO/LEO (medium Earth orbit/low Earth orbit) double-layered satellite networks. In this type of networks, the rapidly changing network topology due to relative motion of satellites is one of the main challenges when designing an efficient routing algorithm. Specifically, the issues of high rerouting overhead and traffic routing with diverse QoS requirements remain to be resolved. This paper proposed a M-BMDP (modified bandwidth constrained minimum delay path) routing algorithm based on swarm and location for MEO/LEO double-layered satellite networks. This algorithm forms a set of LEO groups according to the footprint of MEO satellites and chooses the relative MEO satellites as its group manager. For delay sensitive traffic, the algorithm can improve the QoS as the cost of packet loss based on hop limit. And for users located in reversed crevice zone, the traffic can route through one MEO satellite to reduce the time delay. The simulation results show that the M-BMDP algorithm performs better in rerouting delay, overhead and pack loss rate compared with existing solutions.

SLSA: A Link Stability Based Algorithm for the Topology Optimization of IGSO/MEO Double-Layered Satellite Network

With satellite networks playing an important role in many areas, how to design a satellite networktopology and interconnect with terrestrial networks has also attracted widespread attention. However,due to the high mobility of the satellite nodes and the limited number of connected antennas,it is challenging to effectively construct a fixed network topology with stable link quality during thesatellite operation period. In this paper, we propose a satellite link stability based algorithm (SLSA)for the topology optimization, which is based on link stability to generate Inclined GeosynchronousSatellite Orbit / Medium Earth Orbit (IGSO/MEO) double-layered satellite network (DLSN) topology.SLSA aims to build a stable topology with uninterrupted link connection and low transmissiondelay to reduce the extra transmission delay caused by frequent interruptions under the conditionof the limited number of satellite links. We compare SLSA with the shortest path based topologygeneration method, implement the simulation topology and conduct contrast experiments. The experimentalresults verify that SLSA has longer connection time and lower transmission delay thanthe traditional method.

Analysis on Connectivity of Inter-Orbit-Links in a MEO/LEO Double-Layer Satellite Network

As an important scheme of future global mobile satellite communication systems to provide multimedia service, a Double-Layer Satellite Network (DLSN) with MEO satellites and LEO satellites is proposed. The Inter-Orbit-Links (IOLs) between layers is an essential factor, which affects the performances of the DLSN systems. Considering certain constellation parameters, the geometric characteristics of IOLs are described and the connectivity of MEO satellites and LEO satellites in the DLSN is analyzed. By computer simulation, the results show that IOLs should be selectively established according to certain parameters rather than the simple in-sight principle.

Performance evaluation on a double-layered satellite network

How to evaluate the performance of satellite networks is a prerequisite to the construction of satellite networks, and is also one of challenges in the researches on satellite networks. In this paper, generalized stochastic Petri net (GSPN) models are presented to carry out the performance analysis of a double-layered satellite network. Firstly, the GSPN model of a double-layered satellite network is simplified by proper analysis. Then, two sets of experiments are conducted to analyse the performance of the satellite networks, and show that the double-layered satellite network outperforms single-layered ones on the heavy traffic load. Finally, the feasibility and effectiveness of the proposed approach is verified by simulation experiments. Copyright © 2005 John Wiley & Sons, Ltd.