Physical Layer Representation for Satellite Network Emulator (original) (raw)
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International Journal of Satellite Communications, 1995
The availability of good software tools is vital to simulation practitioners. The objective of the OSISIM project (Open System Integrated Simulator) is to set up an environment which integrates facilities and tools to build a communication system, and to study its performance. The environment is called AMS : Atelier for Modelling and Simulation. Using it, the network architect, i.e. the user of the atelier, can quickly construct, in a graphical environment, a concise system from models of several standard networks available in a specific library, and execute the system in an efficient manner. Starting with an outline of the components of the atelier, we describe the AMS prototype, and the internal structure of basic models to be included in it. Moreover, a concrete example of a communication system including a satellite backbone is provided to illustrate how AMS is used to simulate a such system.
Possibility of Using Network Simulator (NS-2) for Modeling Satellite Networks
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The concept of Fade Mitigation Technique (FMT) has been highlighted for the Fixed Satellite Service since the use of high frequency (Ka, Q/V or EHF-band) is foreseen in the near future. At low frequency bands (C to Ku), propagation through the troposphere is considered only through the implementation of a static margin into the system, which at Kuband is approximately the rain attenuation exceeded for the percentage of time corresponding to the availability requirement. At Ka and Q/V-bands, other propagation effects have to be taken into account (gas and cloud attenuation, scintillation), and as impairments are stronger, the typical service availability objectives can not be obtained anymore if the system is designed in the same way. Fade Mitigation Technique have to be considered and have to be introduced into the system through the design of a control loop, which aims at mitigating a propagation event in real time, by adapting some systems parameters : transmitted power, coding, modulation. The dynamics of the channel is therefore a key element to be taken into account directly into the definition of FMT control loop, for instance by numerical simulation using experimental time series of propagation impairments. However these experimental data are not always available to system designers, and in addition exist only for specific locations, frequencies and elevations. An alternative is to use time series synthesisers, where the inputs are characteristics of the link, and the outputs represent every kind of temporal and spectral characteristics of the channel (short term signal variations, long term primary and secondary statistics, …). The aim of this paper is to present recent developments in terms of propagation time series synthesisers. In the first part, the initial requirements related to propagation time series and to the dynamics of the propagation channel for system performance simulation are listed, focussing on the requested inputs and on the expected outputs of time series synthesisers. In the second part, a list of time series generators that have been presented so far in the literature is given with their basic principles. In the third part, two methodologies used to compare and validate the time series synthesisers are mentioned (long-term and event-based analyses). A large testing activity has been conducted using an experimental database collected during the ITALSAT and OLYMPUS campaign. The results of this analysis give very promising confidence for using some of these channel models for the simulation and design of future satellite systems.
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Simple Satellite Network Simulation using OMNET++ 5
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Network emulation focusing on QoS-Oriented satellite communication
The rapidly growing Internet architecture is causing most recent computer applications to integrate a more or less important part of distributed functionalitiessuch as transport layer services, transport protocols and other services-that need to meet user's necessities in terms of functionalities and Quality of Service (QoS) requirements. Emulation platforms are a classical way for protocol and applicative experiments to check if user and QoS requirements are met. They complement the simulation and real network experiments, since they enable to use real implementation of protocols or applications without having a real network deployed for the experiments. This chapter presents the emulation approach in the context of networking experimentation: First, the different possible utilisations of dynamic emulation in the context of networking and protocol engineering are presented. Then, requirements for a general network emulation framework are proposed. Furthermore, different network emulation platforms and tools implementing the general framework are exposed; we describe how to use them in the context of protocol engineering and discuss their advantages and disadvantages. Finally, the emulation of wireless systems is challenging, due to many parameters affecting the resulting behaviour of the channel. Satellite emulation, a subset of wireless emulation, has unique characteristics concerning the access to the resource that combines static and dynamic assignment. As an example, the emulation of a QoS-oriented satellite system is detailed in a final section.
Appendix B: Network Emulation Focusing on QoS-Oriented Satellite Communication
End-to-End Quality of Service Over Heterogeneous Networks, 2008
The rapidly growing Internet architecture is causing most recent computer applications to integrate a more or less important part of distributed functionalitiessuch as transport layer services, transport protocols and other services-that need to meet user's necessities in terms of functionalities and Quality of Service (QoS) requirements. Emulation platforms are a classical way for protocol and applicative experiments to check if user and QoS requirements are met. They complement the simulation and real network experiments, since they enable to use real implementation of protocols or applications without having a real network deployed for the experiments. This chapter presents the emulation approach in the context of networking experimentation: First, the different possible utilisations of dynamic emulation in the context of networking and protocol engineering are presented. Then, requirements for a general network emulation framework are proposed. Furthermore, different network emulation platforms and tools implementing the general framework are exposed; we describe how to use them in the context of protocol engineering and discuss their advantages and disadvantages. Finally, the emulation of wireless systems is challenging, due to many parameters affecting the resulting behaviour of the channel. Satellite emulation, a subset of wireless emulation, has unique characteristics concerning the access to the resource that combines static and dynamic assignment. As an example, the emulation of a QoS-oriented satellite system is detailed in a final section.