Showing papers on "Mobile technology published in 1994"

Maintaining seamless communication between mobile users: An Architecture and Communication Protocol for picocellular networks

Abstract: munication and wireless LAN technology will make it possible, in the near future, for mobile users to transparently access communication networks from anywhere at any time. The mobile user will typically use powerful palmtop or laptop computers that are equipped with wireless communication capability to connect towired networks. This type of computing environment is referred to as mobile computing. The mobility of the nodes and the small size (in terms of storage space) of the hand-held devices make traditional solutions to network problems such as

Revising transaction concepts for mobile computing

Abstract: It is expected that in the near future millions of users will have access to on-line distributed databases through mobile computers. The restrictions imposed by the nature of the wireless medium and the resulting mobility of data consumers and data producers make traditional transaction models inadequate. In this paper, we investigate means for providing transaction support appropriate for mobile environments. Specifically, we define a model that ensures a weaker notion of consistency, accounts for mobility, and provides for recovery.

Network planning for third-generation mobile radio systems

Abstract: The success of UMTS relies not only on the development of a flexible air interface, efficient coding techniques, and handset technology; it is equally important to design a system that can support the underlying technology and to interface with other networks. >

UMTS integrated with B-ISDN

Abstract: Since, by the turn of the century, a mobile terminal will be involved in 50 percent of all calls, it is critical that the integration of the fixed and mobile telecommunication systems succeeds. This will require that B-ISDN support some features necessary to provide mobility services to the users. In the scenario discussed in the present article, the UMTS base stations are connected to a B-ISDN local exchange using the same user-network-interface (UNI) as B-ISDN fixed network terminals. Therefore, many of the aspects discussed in the article are related to the UNI. >

Revising Transaction Conceptsf or Mobile Computing

Abstract: It is expected that in the near future millions of users will have access to on-line distributed databases through mobile computers. The restrictions imposed by the nature of the wireless medium and the resulting mobility of data consumers and data producers make traditional transaction models inadequate. In this paper, we investigate means for providing transaction support appropriate for mobile environments. Specifically, we define a model that ensures a weaker notion of consistency, accounts for mobility, and provides for recovery.

Mobility: A Medium for Computation, Communication, and Control

Abstract: The advent of ubiquitous mobile computing has widely been regarded as the convergence of pager-like communications technology and laptop-like computational power enabling applications that span both realms of functionality. However ubiquitous mobile computing, coupled with the proliferation of microprocessor-controlled appliance s and networking, creates another important new application arena: that in which mobile computers act as controllers for and interfaces to, appliances and services in the surrounding environment. This position paper explores the convergence of computation with communications and control applications, and the models of mobile computing that consequently arise. Established applications and models are positioned relative to this framework, and hither to unexplored control-based models of mobile computation are described.

A mobile audio-visual terminal for the DECT system

Abstract: The recent explosion in the number of mobile terminals awoke the scientific community to the need of providing in a short time audio-visual services in mobile environments. Due to the low bandwidth available and the critical characteristics of mobile channels, audio and video source coding as well as channel coding became more complex and thus new solutions must be provided. This paper describes the technical solutions designed for the first prototype of an audio-visual mobile terminal with special emphasis in the video coding options. >

A system-platform for mobile computing applications

Abstract: Systems with both mobile and stationary computers are of increasing importance. Mobile users can access information anywhere and anytime. Basic components needed for mobile computing are smart portable computers and wireless communication networks. Major problems due to mobility and the specific characteristics of portable computers and wireless communications are dynamic configuration, moving resources, reachability, data and function consistency. A complete system architecture to enable mobile computing, called MOBI-DICK, is presented. This system can be used as a programming platform to hide the specifics of mobile computing from the application programmer.

Mobile communications

Abstract: The principal problem faced by networks with mobile users is how to ensure that the service provider functions keep pace with the continually changing network state resulting from user mobility, without consuming large amounts of network resources in the process. Regardless of whether the users are mobile or stationary, all telecommunications networks must perform basic service provider functions such as controlling access to services, locating users, routing traffic, and accounting and billing for service use. However, in the presence of mobile users, all of these functions must be performed much more often and much more rapidly. Developing low-overhead high-performance service provider solutions has been and will continue to be a key area of research in mobile communications. This special issue on mobile communications comprises five articles, each of which covers a different aspect of mobile communications. >

Replication Strategies for Mobile E-Mail

Abstract: Mobile computer users may have multiple computers and various communication methods available to them. Thus, effective electronic mail services in diverse mobile environments, including both wireless and wireline scenarios, can be significantly enhanced using replication services. In this paper, we discuss our adaptations of R.A. Golding's (1992) weak-consistency group communication and membership protocols for robustness in mobile environments.