Assessment of access selection and transmit diversity in (non) cosited multi-access networks

Multi-access networks integrate a number of radio accesses (RAS) over which a data flow may be transmitted. Considering the possibility of multi-radio transmit diversity (MRTD), where a given flow may be assigned multiple RAS either in parallel or in a switched mode, we investigate mechanisms for joint RA selection and scheduling of data flows...

Proxying UPnP service discovery and access to a non-IP Bluetooth network on a mobile phone

The current service- and device discovery protocols are not platform- and network independent. Therefore, proxy servers will be needed to extend the range of IP-based discovery protocols to non-IP domains. We developed an architecture of a proxy that enables Universal Plug and Play (UPnP) devices and services to be discovered and accessed on the...

Radio access selection in multi-radio access systems

Future wireless access systems will be characterized by their heterogeneity from technological point of view. It is envisaged that in certain areas end-users will have a choice between various radio accesses (RAs) such as e.g. classical cellular networks (GSM, UMTS, WiMAX, etc), WLAN hot-spots, or over multiple hops via wireless ad-hoc networks....

Robustness of networks against viruses: The role of the spectral radius

In this paper we study the spectral radius of a number of real-life networks. This study is motivated by the fact that the smaller the spectral radius, the higher the robustness of a network against the spread of viruses. First we study how wellknown upper bounds for the spectral radius of graphs match to the spectral radii of the social network...