Roaming the landscape

The Wi-Fi Roaming Game

We propose an extensive-form game as a model for pricing roaming charges in 802.11 wireless data networks. We specify utility functions for the three agents involved in the game: the wireless user and the visited and home operators. With realistic assumptions, we use the model to find optimal roaming prices for delay insensitive users.

National Roaming

National roaming is a form of infrastructure sharing in mobile communication networks, where an operator opens his network for a competitor’s customers and is compensated by a usage based charge. Arguments in favour of national roaming include the reduction of network investments or faster network rollout. This paper examines the effects of national roaming on competition, network investments a...

Internet Roaming

In the near future of ubiquitous computing, an ever increasing number of computers and devices will have an Internet connection. But still most of the applications and services people use will be accessible from a limited number of machines only. Internet Roaming is our approach to provide controlled access to services from a wide range of machines in a secure fashion, while explicitly managing...

Sicheres übergangsloses Roaming

Situationist Roaming Online

Situationism has recently been equated with the online context, especially in form of information access as a kind of online ‘dérive’. This equation is not necessarily an obvious one and thus will be questioned in the paper by referring to the original concept(s) in Situationism. The concentration is on an outline of the concept of the dérive and its potential relationship to online information...