Dimitrios Tsilimantos

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The issue of energy efficiency (EE) in Orthogonal Frequency-Division Multiple Access (OFDMA) wireless networks is discussed in this paper. Our interest is focused on the promising concept of base station (BS) sleep mode, introduced recently as a key feature in order to dramatically reduce network energy consumption. The proposed technical approach fully(More)
The design of next generation wireless networks is strongly motivated by the need to improve network energy efficiency (EE), while ensuring that the provided performance, often expressed in terms of spectral efficiency (SE), satisfies the vastly increasing user demands. In this context, this paper discusses about the SE-EE trade-off in Orthogonal(More)
The issue of UMTS WCDMA radio network planning is studied in this paper. The impact that smart antennas can have on essential WCDMA network parameters is demonstrated with the help of a radio network planning tool, by means of Monte Carlo simulations. The scope of this paper is to demonstrate with simulations from a typical urban operational scenario how(More)
In anticipatory networking, channel prediction is used to improve communication performance. This paper describes a new approach for allocating resources to video streaming traffic while accounting for quality of service. The proposed method is based on integrating a model of the user’s local play-out buffer into the radio access network. The linearity of(More)
HTTP Adaptive Streaming (HAS) techniques are now the dominant solution for video delivery in mobile networks. Over the past few years, several HAS algorithms have been introduced in order to improve user quality-of-experience (QoE) by bit-rate adaptation. Their difference is mainly the required input information, ranging from network characteristics to(More)
This paper describes a novel system that provides key parameters of HTTP Adaptive Streaming (HAS) sessions to the lower layers of the protocol stack. A non-intrusive traffic profiling solution is proposed that observes packet flows at the transmit queue of base stations, edge-routers, or gateways. By analyzing IP flows in real time, the presented scheme(More)
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