Recent developments in mobile communication and personal computer technology have laid a new foundation for mobile computing. Performance of the data communication system as seen by an application program is a fundamental factor when communication infrastructure at the application layer is designed. This paper provides results of performance measurements of data transmission over two different cellular telephone networks, a digital GSM-network and an analogue NMT-network. Since our emphasis is on performance as seen by application programs, we use the standard TCP/IP protocols in the measurements. The performance is measured using three basic operations: establishment of a wireless dial-up connection, exchange of request-reply messages, and bulk data transfer. The external conditions under which the measurements were carried out present a normal office environment when the field strength of the cellular link is good or fairly good.
This paper describes the architecture of the network layer used in terminals and the access network of the BRAIN project. It describes the design principles that have been applied, the basic access network structure that results, and the way in which this structure fits with other components of the complete mobile system.
Nomadicity is a new challenge for computing and communication technologies. Modern cellular telephone systems extend the usability of portable personal computers enormously. A nomadic user can be given ubiquitous access to remote information stores and computing services. However, the behaviour of wireless links creates severe inconveniences within the traditional data communication paradigm. In this paper we give an overview of the problems related to wireless mobility. We also present a new software architecture for mastering the problems and discuss a new paradigm for designing mobile distributed applications. The key idea in the architecture is to place a mediator, a distributed intelligent agent, between the mobile node and the wireline network.
Modern cellular telephone systems extend the usability of portable personal computers enormously. A nomadic user can be given ubiquitous access to remote information stores and computing services. However, the behavior of wireless links creates severe inconveniences within the traditional data communication paradigm. We give an overview of the problems related to wireless mobility. We also present a new software architecture for mastering the problems and discuss a new paradigm for designing mobile distributed applications. The key idea in the architecture is to place a mediator, a distributed intelligent agent, between the mobile node and the wireline network.
Modern portable computers and wireless connections over cellular telephone networks have created a new platform for distributed information processing. We have designed a communication architecture that makes it possible to exploit the existing TCP/IP communication protocols but that also takes into account specific features of cellular links. Our communication architecture is based on the concept of indirect interaction. The mediating interceptor is the bridge between the worlds of wireless and wireline communication. It also provides enhanced functionality that improves fault-tolerance and performance. In this paper we demonstrate how the architecture is used to improve the performance of the WWW information browsing. Similar solution methods can be applied to other existing applications and protocols.< >
Today the World-Wide Web is the most widely used distributed application. By utilising the data services of cellular telephone systems such as the digital GSM, WWW can be brought to nomadic users. However, the characteristics of cellular telephone links differ greatly from wire-line links. The narrow bandwidth, highly variable transmission delays, and sudden disconnections create problems for many Internet applications. WWW uses the HTTP and TCP/IP protocols, which exhibit a number of usability and performance problems in wide-area mobile networks. Mowgli WWW, a WWW middleware implementation, exploits several new techniques to solve these problems. Although Mowgli WWW was initially designed for a wireless WAN environment, the techniques are also profitable in fixed networks when slow or high-latency communication links are involved.
Article Free Access Share on Introducing quality-of-service and traffic classes into wireless mobile networks Authors: Jarkko Sevanto Nokia Research Center, P.O. Box 407 (Heikkiläntie 7) FIN-00045 NOKIA GROUP, Finland Nokia Research Center, P.O. Box 407 (Heikkiläntie 7) FIN-00045 NOKIA GROUP, FinlandView Profile , Mika Liljeberg University of Helsinki, Department of Computer Science, P.O. Box 26 (Teollisuuskatu 23), FIN-00014 University of Helsinki, Finland University of Helsinki, Department of Computer Science, P.O. Box 26 (Teollisuuskatu 23), FIN-00014 University of Helsinki, FinlandView Profile , Kimmo Raatikainen University of Helsinki, Department of Computer Science, P.O. Box 26 (Teollisuuskatu 23), FIN-00014 University of Helsinki, Finland University of Helsinki, Department of Computer Science, P.O. Box 26 (Teollisuuskatu 23), FIN-00014 University of Helsinki, FinlandView Profile Authors Info & Claims WOWMOM '98: Proceedings of the 1st ACM international workshop on Wireless mobile multimediaOctober 1998 Pages 21–29https://doi.org/10.1145/288338.288358Published:01 October 1998Publication History 3citation507DownloadsMetricsTotal Citations3Total Downloads507Last 12 Months16Last 6 weeks8 Get Citation AlertsNew Citation Alert added!This alert has been successfully added and will be sent to:You will be notified whenever a record that you have chosen has been cited.To manage your alert preferences, click on the button below.Manage my AlertsNew Citation Alert!Please log in to your account Save to BinderSave to BinderCreate a New BinderNameCancelCreateExport CitationPublisher SiteeReaderPDF
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