95 research outputs found
Satellite ATM Network Architectural Considerations and TCP/IP Performance
In this paper, we have provided a summary of the design options in
Satellite-ATM technology. A satellite ATM network consists of a space segment
of satellites connected by inter-satellite crosslinks, and a ground segment of
the various ATM networks. A satellite-ATM interface module connects the
satellite network to the ATM networks and performs various call and control
functions. A network control center performs various network management and
resource allocation functions. Several issues such as the ATM service model,
media access protocols, and traffic management issues must be considered when
designing a satellite ATM network to effectively transport Internet traffic. We
have presented the buffer requirements for TCP/IP traffic over ATM-UBR for
satellite latencies. Our results are based on TCP with selective
acknowledgments and a per-VC buffer management policy at the switches. A buffer
size of about 0.5 * RTT to 1 * RTT is sufficient to provide over 98% throughput
to infinite TCP traffic for long latency networks and a large number of
sources. This buffer requirement is independent of the number of sources. The
fairness is high for a large numbers of sources because of the per-VC buffer
management performed at the switches and the nature of TCP traffic.Comment: Proceedings of the 3rd Ka Band Utilization Converence, Italy, 1997,
pp481-48
Satellite Networks: Architectures, Applications, and Technologies
Since global satellite networks are moving to the forefront in enhancing the national and global information infrastructures due to communication satellites' unique networking characteristics, a workshop was organized to assess the progress made to date and chart the future. This workshop provided the forum to assess the current state-of-the-art, identify key issues, and highlight the emerging trends in the next-generation architectures, data protocol development, communication interoperability, and applications. Presentations on overview, state-of-the-art in research, development, deployment and applications and future trends on satellite networks are assembled
Avaliação de desempenho de comutadores ATM /
Dissertação (Mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico
Energy-efficient wireless communication
In this chapter we present an energy-efficient highly adaptive network interface architecture and a novel data link layer protocol for wireless networks that provides Quality of Service (QoS) support for diverse traffic types. Due to the dynamic nature of wireless networks, adaptations in bandwidth scheduling and error control are necessary to achieve energy efficiency and an acceptable quality of service. In our approach we apply adaptability through all layers of the protocol stack, and provide feedback to the applications. In this way the applications can adapt the data streams, and the network protocols can adapt the communication parameters
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