Large, low Earth orbit, broadband satellite networks have recently become a growing area of research as a number of implementations are currently being constructed by commercial businesses. Unlike previous systems, these new constellations are comprised of 100’s to 1,000’s of interconnected satellites. This thesis project has resulted in a novel simulation toolthatenablesthestudyofinter-satellitelinkingmethodsinlargesatelliteconstellations: SImulator for Large LEO-Satellite Communication NetworkS (SILLEO-SCNS). Additionally, the thesis presents the analysis of several network designs and constellation structures, with regards to their routing performance. -- Abstract.

Modeling and Simulation Environment for Satellite and Terrestrial Communications Networks: Proceedings of the European COST Telecommunications Symposium will be of interest to network designers, developers, and operators. This book is a collection of papers given at the European Cost Telecommunications Symposium. The Symposium was broken down into four sessions: Modelling and Simulation. Teletraffic Modelling. Communications Networks Simulation. Problems in Simulation. Each session addressed a wide spectrum of subjects. The symposium covered nearly all of the important aspects of simulation modeling and tools for the design and performance evaluation of communication techniques and systems. Emerging techniques were emphasized. Modeling and Simulation Environment for Satellite and Terrestrial Communications Networks: Proceedings of the European COST Telecommunications Symposium is a useful reference work for practicing engineers and academic researchers.

Abstract: "Communication satellites today are playing an important role in satisfying the increasing demand for worldwide telecommunications. The new generation of proposed satellite systems like Teledesic and the Hughes Spaceway system, to name a few, promise to provide global, broadband connectivity. A number of the technologies to be used on these satellite systems have not been completely validated in a large user environment. As a forerunner to these proposed systems, NASA has an experimental satellite, ACTS, that uses some of the new technologies like on-board switching, hopping spot beams, and the Ka-band. NASA is very interested and is actively leading the effort in researching interoperability of high bandwidth Ka-band satellites like ACTS with terrestrial high bandwidth, low propagation networks. Industries that have a global presence have applications that need broadband standards-based global connectivity. One such industry is the earthmoving and mining equipment industry. Mining and construction equipment is used in some of the remotest locations in the world with no established communications infrastructure. No single wireless networking technology can meet their special needs. They are looking for solutions that can provide high speed, low propagation wireless local area network solutions at the remote site and also solutions that can provide broadband global connectivity to the site. The broadband solution needs to seamlessly integrate with other terrestrial networks. For these companies, the global coverage and the high bandwidth capabilities offered by the new generation satellite systems enable a whole set of new applications. This thesis is an attempt to address the issue of interoperability with terrestrial and cellular networks. It does this in three ways. First, developing a model for broadband geostationary satellites that can be used for conducting communication protocols research. Second, by looking at the issue of mobility and communication protocols that support mobility for broadband communications. Third, by analyzing some of the proposed versions of the TCP transport protocol for a TCP/IP-based broadband satellite network. The thesis analyzes the performance of different TCP versions, TCP Normal (Reno), TCP SACK, and TCP FACK over ACTS. The performance of Mobile IP and TCP when used together in the ACTS environment is enhanced. A method of buffering is proposed and implemented to improve the performance of Mobile IP. A simulation model of the ACTS satellite link is developed in a network simulation package called ns. The Two-State Markov model using a Pareto distribution is a probabilistic error model directly integrated with the simulator. The simulation model is verified with results from the experiments conducted over ACTS."

Routing and Quality-of-Service in Broadband LEO Satellite Networks describes mechanisms for supporting Quality-of-Service (QoS) strategies that consider properties of low earth orbit satellite networks and their effects on link handover. A graph model representing the dynamic topology of a satellite constellation is introduced based on a new parameter, lifetime. Novel routing and resource reservation algorithms as well as connection admission control strategies are proposed to minimize the handover blocking probability while maintaining QoS requirements. The author also discusses the roles of satellites in an all-IP mobile network architecture and the problems of mobility, QoS provisioning, and routing. This work will be of particular interest to researchers and professionals working on mobility networking in next generation networks.

In the rapidly changing environment of mobile communications, the importance of the mobile satellite (e,g,, low earth orbit satellites (LEOsats)) networks will increase due to their global visibility and connection. Multicasting is an effective communication method in terms of frequency spectrum usage for a LEO network. It is devised to provide lower network traffic (i,e,, one-to-many transmissions). This research examines the system performance of two dissimilar terrestrially-based multicasting protocols: the Distance Vector Multicast Routing Protocol (DVMRP) and the On Demand Multicast Routing Protocol (ODMRP). These two protocols are simulated in large group membership density and in the presence of satellite failures. Two different algorithms are developed and used to select critical satellites for degrading a LEO network constellation. The simulation results show that the ODMRP protocol successfully reconfigured routes in large group membership density areas and in satellite failure conditions. Results also show that the ODMRP provided reliable packet delivery. However, ODMRP showed an enormous end-to-end delay in severe satellite failure conditions. This result is attributable to the delayed route refreshing procedure of ODMRP. In contrast, the DVMRP suffered from broken routes and complexity in the large group membership density and in satellite failure conditions. It had a smaller packet delivery ratio than the ODMRP (approximately 85,5% versus 98,9% for the 80 user case). The DVMRP showed scalable and stable end-to-end delay under multiple failed satellite conditions. The large group membership density and the multiple satellite failure conditions provide a more complete assessment for these two protocols.

The emphasis of this text is on data networking, internetworking and distributed computing issues. The material surveys recent work in the area of satellite networks, introduces certain state-of-the-art technologies, and presents recent research results in these areas.

IEEE ICC is one of the two flagship IEEE conferences in the field of communications Montreal is to host this conference in 2021 Each annual IEEE ICC conference typically attracts approximately 1,500 2,000 attendees, and will present over 1,000 research works over its duration As well as being an opportunity to share pioneering research ideas and developments, the conference is also an excellent networking and publicity event, giving the opportunity for businesses and clients to link together, and presenting the scope for companies to publicize themselves and their products among the leaders of communications industries from all over the world