Evangelos Pallis

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Network Functions Virtualization (NFV) is a concept, which has attracted significant attention as a promising approach towards the virtualization/“softwarisation” of network infrastructures. With the aim of promoting NFV, this paper outlines an integrated architecture, designed and developed within the context of the EU FP7 T-NOVA project,(More)
This paper presents an assessment method for fast and quantified estimation of the Perceived Quality of Service (PQoS) for homogeneous MPEG-4 video content, enabling optimized utilization of the corresponding storage and bandwidth resources. Besides, the Mean Perceived Quality of Service (MPQoS) as a function of the video encoding rate is introduced and(More)
This paper proposes a routing protocol enriched with an assigning mechanism and a capacity-aware scheme, enabling for efficient data flow coordination and energy conservation, among networking nodes with heterogeneous radio spectrum availability in ad-hoc cognitive radio networks. The proposed assigning mechanism is able to effectively determine efficient(More)
This paper describes a prototype system that enables for Electronic News Gathering applications through a wireless broadband networking infrastructure. The network makes use of the TCP/IP protocol stack and operates in the frequency band of 2.4GHz by utilising Spread Spectrum (SS) modulation technique. The use of the TCP/IP enables for various additional(More)
This paper discusses the design and prototyping of a cognitive radio system architecture that enables for TVWS exploitation under the real time secondary spectrum market policy. It describes a centralized infrastructure-based network, where TVWS allocation among unlicensed systems is administrated by a spectrum broker, carrying out radio-resource management(More)
This paper elaborates on the design and implementation of a prototype system architecture enabling for TVWS exploitation by LTE Advanced systems, under the real time secondary spectrum market policy. It describes a centralised infrastructure-based cognitive radio network, where dynamic TVWS allocation among unlicensed systems is administrated by a spectrum(More)
This chapter proposes a novel concept towards the deployment of a networked ‘Media Ecosystem’. The proposed solution is based on a flexible cooperation between providers, operators, and end-users, finally enabling every user first to access the offered multimedia services in various contexts, and second to share and deliver his own audiovisual content(More)
Contemporary DTV technologies introduce the concept of interactivity to traditional TV broadcast services, provided that a data return channel exists. This paper proposes a wireless access network which is a result of the convergence of wireless data network technologies and digital broadcasting. The proposed network, which is being implemented in the frame(More)
Identifying and managing effectively the Technical Debt has become an issue of great importance over recent years. In cloud marketplaces, where the cloud services can be leased, the difficulty to promptly predict and manage the Technical Debt has a significant impact. In this paper, we examine the Technical Debt, which stems from budget constraints during(More)
The transition from analogue to digital terrestrial television (i.e. Digital Switchover — DSO) releases a significant amount of valuable spectrum (i.e. Digital Dividend), in UHF band. Digital Dividend will be available in the form of a “cleared spectrum” of contiguous channels, as well as in the form of “interleaved(More)