Jens Kammann

A new mobility model based on maps

In this paper we present a mobility model for simulations of wireless access scenarios. This new model has been developed to reduce the shortcomings of previous models in capturing higher-order statistical dependencies in user behavior. The proposed model strikes a balance between the abstraction level of some purely stochastic path generation models that lack certain important properties of the real world and completely deterministic models that fail to produce answers to inherently stochastic problems such as call admission control, hand-off/handover or prefetching of data. The proposed model uses freely definable building maps and radio cell coverage information and generates sensible paths between randomly selected way-points. The paths are generated by a combined diffusion/steepest gradient algorithm. Various models for user speeds can be incorporated. The resulting patterns of user mobility and temporal radio coverage are well applicable in driving simulations with the purpose of addressing key questions in mobile wireless scenarios.

The UV service of the ESA-GSE Project PROMOTE

In Europe (EU25) about half a million skin cancer cases are occurring per year and this is strongly associated with personal habits in relation to sun exposure and its UV component. Within the frame of the European GMES-Program (GMES=Global Monitoring for Environment and Security) the ESA-GSE Project PROMOTE addresses this problem by developing and implementing a UV information service that aims to reach as many as possible citizens of Europe (EU25). The overall PROMOTE UV service contains forecast and monitoring products. The underlying methods, the use of satellite data, the various UV products including related user interfaces, as well as accuracy aspects are described. One central ambition of the PROMOTE project is the close interaction between providers and users. Experiences that have been made and will be made during the different stages of the PROMOTE project contribute significantly to the further up-grading of the services.