Network optimization strategies are core ingredients of radio access network planning for second and third generation mobile systems like GSM and UMTS. We present a combined approach for network topology optimization of the UMTS terrestrial radio access network (UTRAN) which considers the logical network structure as well as transport network aspects. We focus on including Point-to-Multipoint (...

The European Union funded DRiVE project (Dynamic Radio for IP Services in Vehicular Environments) aims at enabling spectrum-efficient high-quality wireless IP communication in a heterogeneous multi-radio environment to deliver in-vehicle multimedia services. Key issues are spectrum efficiency and dynamic spectrum allocation within different radio networks, the IPv6 based network infrastructure ...

Multiple hop routing in mobile ad hoc networks can minimize energy consumption and increase data throughput. Yet, the problem of radio interferences remains. However if the routes are restricted to a basic network based on local neighborhoods, these interferences can be reduced such that standard routing algorithms can be applied. We compare different network topologies for these basic networks...

Reference to the latest developments the spectrum shortage problems are because of the wireless communication. For the future networks the most practical, scientific and systematic challenges is the use of licensed or unlicensed wireless networks with opportunistic use of the spectrum with, without and limited rules. Since different wireless networks are using different frequency bands. So ther...

Dynamic radio network level simulations for network optimization and design become more and more important in the wireless industry, because these systems become more exible, dynamic, and adaptive than they ever were before. Many proprietary discrete{event radio network simulators exist in industry and universities. These simulators are either sequential and slow or parallel, but very complex a...

Large parts of the assigned spectrum is underutilized while the increasing number of wireless multimedia applications leads to spectrum scarcity. Cognitive Radio is an option to utilize non-used parts of the spectrum that actually are assigned to primary services. The benefits of Cognitive Radio are clear when used in emergency situations. Current emergency services rely much on the public netw...