- Researcher in mobile communication technologies (4G, 5G), involved in 3GPP standardization.edit
Abstract A" fourth generation" of wireless systems, likely to appear after the successful deployment of the current third-generation systems, is frequently debated... more
Abstract A" fourth generation" of wireless systems, likely to appear after the successful deployment of the current third-generation systems, is frequently debated these days. This article presents some of the results of the Fourth Generation Wireless project (4GW) of the ...
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AbstractIn this paper we analyze how femtocell base stations (FBS) cause interference in the receivers of user terminals connected to macro base stations. A coverage hole around a FBS appears when closed access strategies are used, ie... more
AbstractIn this paper we analyze how femtocell base stations (FBS) cause interference in the receivers of user terminals connected to macro base stations. A coverage hole around a FBS appears when closed access strategies are used, ie when only authorized users can ...
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High demand for mobile Internet services and interactive services are expected to characterize the user of the future wireless systems. For a large number of applications the user terminal will have to receive massive amount of... more
High demand for mobile Internet services and interactive services are expected to characterize the user of the future wireless systems. For a large number of applications the user terminal will have to receive massive amount of information while sending only a few data. Exploiting this fact in the infrastructure design may have significant implications on the deployment cost of the infrastructure since higher powers can be used at the transmitting sites. Emerging examples include the integration of digital broadcasting systems with personal communication systems. Being capable of taking advantage of future digital broadcasting infrastructure (DAB/DVB-T) and the spectrum allocated for radio and TV broadcasting in VHF/UHF band, the new hybrid systems show promising performance and especially good business opportunities when deployed in wide areas with fairly low user densities. The objective of the paper is to evaluate the potential of digital broadcasting systems (mainly DVB-T) when ...
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One of the ways towards provision of low-cost mobile multimedia entertainment is to make possible the sharing of the wireless resources among multiple operators of dif-ferent radio access technologies. Here we discuss oppor-tunities for... more
One of the ways towards provision of low-cost mobile multimedia entertainment is to make possible the sharing of the wireless resources among multiple operators of dif-ferent radio access technologies. Here we discuss oppor-tunities for new system architectures enabled by sharing the resources belonging to the cellular and broadcasting systems, namely the spectrum and the infrastructure. The goal of this paper is to identify the bottlenecks of such ar-chitectures and the challenges that have to be addressed on their path towards a functional system able to deliver low-cost mobile multimedia services.
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AbstractIn this paper we analyze how femtocell base stations (FBS) cause interference in the receivers of user terminals connected to macro base stations. A coverage hole around a FBS appears when closed access strategies are used, ie... more
AbstractIn this paper we analyze how femtocell base stations (FBS) cause interference in the receivers of user terminals connected to macro base stations. A coverage hole around a FBS appears when closed access strategies are used, ie when only authorized users can ...
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ABSTRACT This paper discusses hybrid cellular-broadcasting systems as an alternative for future delivery of wireless mul- timedia multicast services. A resource management framework is proposed, with the objective of minimizing the cost... more
ABSTRACT This paper discusses hybrid cellular-broadcasting systems as an alternative for future delivery of wireless mul- timedia multicast services. A resource management framework is proposed, with the objective of minimizing the cost of multi- casting transmissions. A comparison with traditional cellular and broadcasting systems is performed, showing the advantages of the hybrid solution under specific settings. Several implementation issues are investigated, as the number of broadcasting modulation and coding rates (MCR) and the importance of radio link monitoring. Dynamic control of the coverage of the broadcasting system by choosing from a pre-defined set of MCRs is shown to be the most important requirement for minimizing transmission cost. As the existing digital broadcasting technologies do not offer the possibility to dynamically change the MCR, several possibilities to overcome this are identified. I. INTRODUCTION Dynamic coordination and integration of the existing wire- less networks is part of the vision adopted in Ambient Net- works project (1). Networks target forthcoming dynamic com- munication environments where a multitude of different wire- less devices, radio access technologies and network operators can cooperate, as well as compete, by means of instantaneous network agreements. In order to facilitate dynamic composi- tion of networks, a multi-radio access architecture has been devised, consisting of multi-radio resource management and generic link layer. One of the key objectives of this architecture is the efficient utilization of the existing radio resources by means of effective radio access selection mechanisms (2).
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ABSTRACT This paper describes and evaluates a novel resource management technique for minimizing the file transmission cost in a hybrid cellular-broadcasting system. While DVB-H technology is utilized for wide area broadcasting, the... more
ABSTRACT This paper describes and evaluates a novel resource management technique for minimizing the file transmission cost in a hybrid cellular-broadcasting system. While DVB-H technology is utilized for wide area broadcasting, the 3G-HSDPA system takes the role of providing not only feedback about reception conditions, but also on-demand repair information to the users that have missed part of the DVB-H transmissions. The application layer - forward error correction with Raptor coding is used to generate parity data that is sent to the users through both cellular and broadcasting system. Our results show significant potential for cost reduction under certain settings and scenarios. Overall, we think that the outcomes of this study should encourage the interworking of cellular 3G and DVB-H broadcasting systems, in an effort to achieve cost efficient delivery of multimedia content to mobile users.
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The multi-radio access architecture within the ambient network concept opens up opportunities for new business roles within the mobile and wireless domain. The new business roles take advantage of the control plane functionality that... more
The multi-radio access architecture within the ambient network concept opens up opportunities for new business roles within the mobile and wireless domain. The new business roles take advantage of the control plane functionality that enables cost efficient connectivity over heterogeneous radio access technologies.