Dynamic adaptation of network connections in mobile environments

Abstract

S oftware engineers who want to migrate existing applications from fully connected environments to mobile environments face a significant problem in obtaining and maintaining network connectivity. In fully connected environments, connectivity is static and permanently established through wired networks. Applications simply "assume" that they are online continuously. This assumption is clearly invalid in mobile environments that use wireless connections. While decreases in computer size and cost have made it more practical to use a portable computer as a mobile workstation, and advances in wireless technologies have made it possible to access networks outside the reach of wired connections, the development of software for use in a mobile environment has lagged behind these technologies. In general, support for mobile computing is poorly integrated in operating systems and network software.In this article, we discuss some of these problems. We then describe a wireless design of a communication layer for mobile computing and a prototype based on that design. Our work was part of AMIGOS (Advanced Mobile Integration in General Operating Systems), a col-

Jini++: A Framework for Developing Pervasive and Wireless Distributed Applications

“…For example, the high rate of packet loss experienced in wireless networks is incorrectly diagnosed by TCP as network congestion, causing TCP to throttle back. Consequently, throughput deteriorates unnecessarily [10].…”

“…Such technologies typically assume a dedicated, stable and high bandwidth network. Wireless networks, however, do not exhibit these characteristics, hence conventional technology is less appropriate for developing wireless applications [10,19].…”

Towards seamless mobility with personal servers

“…Roaming between different types of networks and service providers is another factor. One could argue that, on the one hand, this is a technical matter with several existing solutions (Hansen et al, 1998;Perkins, 1997). On the other hand, it is a matter of more practical nature.…”

Humanoid robot based on the middleware CORBA

“…It is reliable and stable, and it is very easy to develop its components. Various architectures and integration schemes have been proposed [1][2]. With the development of components-based software engineering, a middleware such as CORBA (common Object Request Broker Architecture) is used to integrate components by virtue of its abstract network layer.…”