L. Atzori

Publications (2)6.31 Total impact

• Source

  Available from: 202.194.20.8

  Conference Proceeding: Evaluating Peer Churn Effects on P2P-Based Video-on-Demand Services

  G. Branca, T. Schierl, L. Atzori
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  ABSTRACT: This paper investigates the effects of peer churns in peer-to-peer networks when used to provide video-on-demand services. To evaluate the impact of user behavior in terms of server load and peer satisfaction, three system models have been developed, which are based on: the Gilbert-Elliot chain, the fluidic representation of the user behavior and a queuing analysis of the system. The models are compared evaluating the additional resources that can increase the reliability of P2P network. Simulations show important relationships between playback buffer length, peer request rate, peer average lifetime, and server upload rate.
  Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE; 01/2010
• Article: A Survey of SOA Technologies in NGN Network Architectures

  G. Branca, L. Atzori
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  ABSTRACT: The SOA (Service Oriented Architecture) paradigm has been driving the definition of important technologies in the telecommunication field for the last decade, as it fosters the deployment of reusable components to support efficient seamless services across different networks. Most of these technologies have focused on the definition of high-level network service interfaces and functionalities, such as Parlay-X and IMS, guaranteeing the success of the SOA model in the telco market after that of web applications. Some works proposing the adoption of this model in the lower network layers have also been proposed, but they have not proved to have the same impact yet. This paper intends to provide the reader with a survey of the works that have been proposed in this field by following the NGN (Next Generation Network) functional architecture as defined by the ITU-T. Specifically, we focus on the service and transport strata of the NGN model and, within each of these, we highlight the main logic functions that have been the subject of investigation according to a service-oriented approach. From the literature review, it can be seen that most of the works fall in service stratum, mostly because of the need for an easy integration of distributed service components at this layer. Only a few papers focus on the transport functionalities, where the benefits of applying the SOA paradigm still need to be investigated.
  IEEE Communications Surveys &amp Tutorials · 6.31 Impact Factor