Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.607o&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
multicasting are currently being sought. Satellite networks can efficiently handle various types of connections because each earth station can directly access all of the satellite network traffic. A multipoint to multipoint (M to N) connection is one such example. Satellite networks consume only M+N network resources, while terrestrial networks basically consume MxN network resources. In the past, there has been little demand for the M-to-N connection type; however, Internet technology is changing this situation. Take for example the case of a network for contents distribution network (CDN) service operators. CDN service operators distribute contents from content providers to caching servers deployed on major Internet service provider (ISP) backbone networks throughout the Internet. Here, a satellite network is the most suitable means of CDN, because both multicasting and M-to-N connection functions are required. However, few satellite systems can handle this type of connection properly. are well accepted as de facto systems for providing high speed Internet access, because they are advantageous in terms of both cost and user terminal size. A DVB VSAT system designed based on a broadcasting network is quite suitable for a network that has a server - client type centralized architecture, but in other cases is not suitable, such as when the network has a de-centralized architecture. In contrast, a network for M-to-N connection can be more efficiently constructed on a de-centralized architecture than on a centralized architecture. already operational. These are candidates for networks that provide efficient M-to-N connection, but their flexibility is a major issue. such as flexible connection, and by nature are suitable for de-centralized networks. In particular, FDMA meshed VSAT systems can be constructed simply, thus ensuring low cost. Also, recently developed technologies can compensate for some drawbacks of the system. The increasing TWTA power on satellites will provide enough power flux density to FDMA channels to make user terminals with small dishes viable. The state-of-the-art multi-rate group modem will give the system sufficient flexibility for bandwidth and connection settings to make full-mesh connections feasible, while maintaining low-cost and small-size equipment. study encompasses network throughput, flexibility, cost and feasibility, taking into account various types of architectures, access control schemes and up-to-date technologies.
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