Virtual cell in mobile computer communications
Computer Communications
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TCP/IP based networks were among the earliest and most successful applications of Local Area Network technologies, and TCP/IP-based internets continue to be a testing ground for emerging high performance transmission technologies as well as the distributed processing applications they support. As distributed processing applications become increasingly available in the next decade, consumer demand for high performance transmission services will extend beyond the distance serviceable by LANs; users will want the same service from their long distance data networks as they get from local networks.Switched Multi-megabit Data Service (SMDS) is a public network service concept designed to satisfy these service requirements. Networks which support SMDS will provide a service analogous to Local Area Networks across metropolitan and eventually wide area distances. The features of SMDS reflect many of the characteristics that make communication via LANs attractive for existing and future distributed processing applications: large packet sizes, high bandwidth, low delay, and multi-cast addressing.This paper identifies the technological and economical factors which contributed first to the emergence of LAN and now MAN technologies, and in particular focuses on how SMDS might be used in TCP/IP environments. A brief description of SMDS is provided, followed by a study of the relationship between SMDS and the DOD Internet Model and a description of the ways in which the service could play a role in existing and future TCP/IP-based internets.