Next-Generation Satellite Networks: Architectures and Implementations
نویسندگان
چکیده
0163-6804/99/$10.00 © 1999 IEEE e are in the midst of a global information revolution brought about by the evolution of digital technology. The enormous strides in digital technology and its applications have fundamentally changed the way in which information is generated, processed, stored, and transported. The resulting information infrastructure will produce profound changes in all aspects of life, such as health care, education, crisis management, environmental monitoring, and electronic commerce. Telecommunications networks, as the arteries of this infrastructure, are evolving rapidly in response to the complex and stringent requirements of the new environment. Satellite communications networks can be an integral part of the newly emerging national and global information infrastructures provided the issues of interoperability of satellite and terrestrial networks are resolved. The rapidly evolving information infrastructure will play a critical role in realizing the “global village” concept of the world. Satellite communications systems are essential in establishing the global information infrastructure (GII). There are two major developments in fixed telecommunication networks: Internet and asynchronous transfer mode (ATM). Satellite communications systems can play a multifaceted role in these evolving telecommunications networks and vastly strengthen the capabilities of the national information infrastructure (NII) and the GII in a number of ways: • Providing global connectivity anywhere and anytime. • Providing cost-effective broadcast/multipoint services. • Reaching remote, inaccessible areas. • Providing connectivity in areas where the terrestrial infrastructure has been damaged. Satellite communications networks, if designed properly, can be a seamlessly interoperable part of global telecommunications networks. Satellite communications systems have a global reach, with very flexible bandwidth-on-demand capabilities, from the agility of the spot beams to the accessibility of the satellite channel from any earth station in the coverage area. Because of these features, coupled with the inherent multipoint/broadcast nature of satellite links, satellite communications systems can serve an important role in the information superhighway. However, a new generation of satellite networks is needed to handle the Internet and multimedia traffic. The traditional circuit switched approach, based on the user or network signaling, is rather inadequate to efficiently carry dynamically varying packet traffic. This article describes a series of satellite based ATM network architectures and implementations. Subsequently, a multi-protocol satellite network architecture with bandwidth on demand is described.
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تاریخ انتشار 1999