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Projecte llegit

Títol: Analysis of OSPFv3 in LEO Satellite Networks

Estudiants que han llegit aquest projecte:

Director/a: MACHADO SANCHEZ, SERGIO

Departament: ENTEL

Títol: Analysis of OSPFv3 in LEO Satellite Networks

Data inici oferta: 13-07-2022     Data finalització oferta: 13-03-2023


Estudis d'assignació del projecte:
    DG ENG AERO/SIS TEL
    DG ENG AERO/TELEMÀT
    DG ENG SISTE/TELEMÀT
Tipus: Individual
 
Lloc de realització: EETAC
 
Segon director/a (UPC): MATA DIAZ, JORGE
 
Paraules clau:
Satellite networks, routing protocols, Linux containers, Iridium constellation, network emulation
 
Descripció del contingut i pla d'activitats:
Dense Low Earth Orbital (LEO) satellite constellations have
gained popularity in the recent years for their ability
to offer worldwide and low-latency services. These networks can
provide aircraft position monitoring services (ADS-B) and radio
communication system between the controller and the pilot.

In an LEO satellite network, N×M satellites are deployed in N
orbital planes, each of which has M satellites that are uniformly
distributed. The satellite network consists of two types of full
duplex links. Communication in the same plane is realized through
Inter-Satellite Links (ISLs), while different layers of the
satellites communicate through Inter-Orbit Links (IOLs). The
ground gateway, which is covered by a LEO satellite, is connected
to the LEO satellite via a User Data Link (UDL).

One of the main research goal for these networks is to develop
and design efficient routing algorithms and protocols for satellite
network topology, providing a reliable data transmission path for
satellite network users. Satellite networks have the following
properties: predictable high mobility, presence of one or more
central processing units and occurrences of unpredictable
changes. The networks are usually modelled by a set of graphs
that model network topology during time slots where the topology
is, with high probability, stable.

The objective of this thesis is the study of some classical
routing protocols using ipmininet. The tasks include the
devolopment of a modular tool that given an input of satellite
network topology graphs generates a emulated network topology in
ipmininet. Moreover, a scheduler tool will modify network
parameters, such latency an broken links, in the current
emulation. With this tool running, the performance analyisis of
the routing protocols will be done.
 
Overview (resum en anglès):
Communication via satellite networks is under continuous research and development as it offers many advances over traditional terrestrial networks such as global coverage, but has a major drawback to be solved, the problem of point-to-point routing.

In this work we have developed a satellite network emulator using Linux containers, which has allowed us to analyze the behavior of the IP routing protocol OSPFv3 in this type of networks. Specifically, its behavior has been analyzed in the Iridium constellation, which is widely known and used in this type of studies. For this purpose, we have used files of the topology of these networks over time generated with the HypatiaSeam orbital propagator, a modification of Hypatia made by the SeamSAT research group of the UPC.

This project is part of a more global project whose objective is to be able to use a network of LEO satellites for communication between aircraft and airspace control centers. This would make it possible to centralize the different control centers, since it would not be necessary for aircraft to be in direct range to communicate with these centers, but thanks to the global coverage provided by these networks, they could communicate from anywhere in the world.

Specifically, in this project we have developed an emulation platform that has allowed us to analyze the behavior of the OSPFv3 protocol to find optimal routes, i.e., shortest distance in terms of the cost function of the protocol.

We will present the design and implementation of the emulation platform as well as the analysis of OSPFv3 performance in terms of protocol convergence time to topology changes, number of hops between a satellite and a ground station, delay and loss rate.


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