This article reports on design, implementation, and preliminary experimentation of a network architecture that supports quality of service for Internet applications. It gives an overview of the various approaches toward communication net wo rks t hat s upport applicatio n-sp ecif ic degrees of QoS. Special emphasis is put on the in tegr ate d and diff erent iate d ser vic es approaches and on combinations of them. A new architecture is described which aims to bring these concepts closer to practical realization in wide-area networks. The new architectur e sup por ts th e int egra ted a s w ell a s differentiated services approaches in a smoothly integrated way, and uses the capabilities of an underlying ATM network to realize QoS. Th e enhancements to the existing n etw ork infrastructure are deliberately limited to the integration of a single new type of network element called an edge device. The potential benefi ts o f such an ar chit ectur e for va riou s stakeholders are explained, and how the new architecture could be introduced smoothly in existing networks by small migration steps, also covering networks based on technologies other than ATM. It is shown that the approach can be scaled up to a very large QoS-aware overlay network for the Internet.
People on the move have a grown need for real-time information and services anytime and anywhere. In many situations, travelers do not feel at ease and well informed when using public transport. Context information on mobile phones e.g., location and calendar data, can significantly improve the user experience in the current situation.The paper addresses an approach of service offering and usage on mobile phones. It focuses on a typical scenario in public transport that covers trip planning, mobile ticketing and service offering on the way. A general framework, classifying, supporting and analyzing user context information, including practical experiences from a mobile ticketing solution, will be introduced.
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