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Coexisting heterogeneous wireless access networks are nowadays common in many places, and growing fast. This, together with the increasing service demand from nomad end-users, indicates that a re-assessment of current mobile terminals' management mechanisms, namely concerning QoS, energy efficiency, etc., is necessary, as well as more suitable access selection polices. The IEEE 802.21 standard provides...
Location information is an important enabler for context aware applications required by next generation networks to provide personalized services. On the other side location knowledge is essential for some of the network main functions such as geographical routing, coverage management and power saving. Mobile devices containing a number of communication standards are able to exploit a heterogeneous...
Advanced simulation tools have taken a lot of attention for development and analysis of new and existing protocols and technologies in wireless communications. The huge amount of information, protocols and techniques to be analysed make however their implementation difficult in one simulator. It is thus of paramount importance to define a common interface between the different layers in order to simplify...
Energy is a critical resource in the design of wireless networks since wireless devices are usually powered by batteries. Without any new approaches for energy saving, 4G mobile users will relentlessly be searching for power outlets rather than network access, and becoming once again bound to a single location. To avoid the so called 4G “energy trap” and to help wireless devices become more environment...
Ad hoc networks are temporary networks with a dynamic topology without any established infrastructure or centralized administration. Each mobile node operates not only as a transceiver, but also as a router and forwards packets for other mobile nodes in the network that may not be within direct transmission range of each other. Jitter is a particularly important quantifier for time sensitive data...
A new Dynamic Resource Allocator (DRA) architecture, based on a cross-layer framework, by using the control and signal channels implemented in the IEEE802.16e standard, is proposed. Commonly and a new designed packet schedulers are used in the performance evaluation of the DRA, by means of system level simulations under a realistic network layout, conducted on a proprietary C++ platform, fully compatible...
This article presents an abstract structure capturing the essence of a mobile shared workspace (MSW), and how a particular MSW can be obtained by instantiating such structure. It is intended to assist designers of mobile groupware tools to conceive new products reusing other designers' knowledge. This approach facilitates the design of a particular MSW in an easy and fast way. We illustrate how the...
This article presents a middleware architecture to support multimedia services across intertechnology radio access networks in a secure and seamless manner. The proposed architecture uses the media-independent handover framework, where the handover decision function is based on triggering/collecting statistics from the physical, network, and application layers so that an ongoing multimedia session...
In this paper an architecture useful to build systems that monitor data streams generated by biological sensors attached to mobile users is presented. In order to illustrate the suitability and applicability of our proposal, we introduce two particular real systems: an anywhere and at any time monitoring system of heart arrhythmias and a portable and light system that monitor sleep apneas. We also...
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