Alessandro Raschellà

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In this work we are interested in investigating how the High Altitude Platform (HAP) can efficiently support Multimedia Broadcast/Multicast Service (MBMS) in a scenarios wherein the terrestrial network is not available. To this aim, we propose to implement an efficient policy of Radio Resources Management (RRM) into the HAP Radio Network Controller (H-RNC).(More)
Multimedia Broadcast Multicast Services (MBMS), introduced by Third Generation Partnership Project (3GPP) in Universal Mobile Telecommunications System (UMTS) Release 6 specification, have the aim to support downlink streaming and game services to groups of users. MBMS can supply users with resources in two different modalities: point-to-point (PtP) and(More)
The popularity of Wi-Fi-enabled devices alongside the growing demand for non-licensed spectrum, has made the Wi-Fi networks exceedingly congested. This endangers the efficiency of Wi-Fi and negatively affect the users' experience. The problem is especially pressing in dense areas (e.g. shopping centers) where Wi-Fi channel assignment is more likely to be(More)
Dynamic Spectrum Access is a key capability of Cognitive Radio (CR) networks to increase the efficiency in the use of the available spectrum resources. In this respect, this paper focuses on the spectrum selection problem when a number of radio links has to be established in a CR network to support applications with different bit rate requirements. A novel(More)
Multimedia Broadcast/Multicast Services (MBMS), introduced in Universal Mobile Telecommunication System (UMTS), have the aim to allow transmissions from a single source entity to multiple destinations. From the radio perspective, MBMS foresees both pointto-point (PtP) and point-to-multipoint (PtM) transmission mode, supported by Dedicated, Common, and(More)
In Wi-Fi networks, Device-to-Device (D2D) communications aim to improve the efficiency of the network by supporting direct communication between users in close proximity. However, in a congested Wi-Fi network, establishing D2D connections through a locally managed self-organising approach will intensify the congestion and reduce the scalability of the(More)
This paper presents a testbed platform to demonstrate and validate spectrum opportunity identification and spectrum selection functionalities in Opportunistic Networks (ONs). The hardware component of the testbed is based on reconfigurable devices able to transmit and receive data at different operating frequencies, which are dynamically configured. The(More)