Publications

A Cloud-based Content Replication Framework Over Multi-Domain Environments

Authors: Kostas Katsalis, Vasilsi Sourlas, Thanasis Korakis, Leandros Tassiulas

Conference:  IEEE ICC, Sydney Australia, June, 2014

Abstract: Cloud service provisioning on top of virtual infrastructures is of major importance in modern ICT, since it is directly correlated to the way business models are designed and revenue is generated from the cloud service providers. In this work we examine an end-to-end content replication problem over cloud-based multi-technology infrastructures. We extend the classical model where every network node is a potential replica carrier and the link weights represent hops/delay and we examine replication schemes for content that a) is requested by customers belonging in different virtual networks and b) depending on the requester there is different impact on the system operational cost. We examine both centralized and distributed content replication management policies and we evaluate their performance through extended simulations, by means of total cost, the number of object replacements and the number of iterations required.

Download paper: Katsalis_CONTENT_ICC_2014.pdf

 

NITOS Testbed: A Cloud based Wireless Experimentation Facility

Authors: Katerina Pechlivanidou, Kostas Katsalis, Ioannis Igoumenos, Dimitrios Katsaros, Thanasis Korakis, Leandros Tassiulas

Conference:  FIDC, 26th International Teletraffic Congress (ITC 26): September 9th-11th, 2014, Karlskrona, Sweden

Abstract: The NITOS wireless testbed, is one of the main building blocks in the wireless testbed experimentation, offered by the FIRE community, and a core Fed4Fire partner. Its main focus is on wireless accessed technologies and on all layers of the protocol stack. In the rapidly changing technological environment, a unique opportunity is provided to enhance the NITOS testbed with cloud computing experimentation capabilities and increase the heterogeneity and diversity of possible services that can be offered to experimenters/ developers. In this paper we describe the NITOS approach on adopting cloud technologies and SDN capabilities and how we upgrade the meaning of ”delivered service” in testbed experimentation using SOA extensions.

Download paper: Pechlivanidou_CONTENT_FIDC_2014.pdf

The EXPRESS SDN Experiment in the OpenLab Large Scale Shared Experimental Facility

Authors: Serge Fdida, Thanasis Korakis, Harris Niavis, Stefano Salsano, Giuseppe Siracusano

Conference:  SDN & NFV – The Next Generation of Computational Infrastructure, Lomonosov Moscow State University, 27-29 October 2014

Abstract: In this paper we describe the design and implementation of an experiments dealing with SDN for Wireless Mesh Networks over the OpenLab Facility. The experiment is called EXPRESS: “EXPerimenting and Researching Evolutions of Software-defined networking over federated test-bedS”. EXPRESS aims at designing and evaluating a resilient SDN system able to operate in fragmented and intermittently connected networks as needed in a Wireless Mesh Networking environment. The experimental dimension of EXPRESS is to deploy the designed SDN infrastructure over a federation of three testbeds (PlanetLab, NITOS and w-iLab.t) from the OpenLab federation. The experiments consist in the evaluation of a designed solution for the selection of the SDN controller by the Wireless Mesh Routers in intermittently connected networks. The experiment is executed through the OMF framework (cOntrol and Management Framework). OMF provides the ability to describe the distributed experiment spanning over different physical testbeds. Following the experiment description, the OMF framework realizes the configuration of the resources (in our case the Wireless Mesh Routers) and their interconnection, runs the experiment and collects the results.

Download paper: istc-openlab-express-final.pdf

C2M: Mobile Data Offloading to Mesh Networks

Authors: Apostolos Apostolaras, George Iosifiids, Kostas Chounos, Thanasis Korakis and Leandros Tassiulas

Conference:  IEEE Globecom 2014, Austin, Texas, USA, 8-12 December 2014.

Abstract: As the unprecedented growth of mobile data traffic places significant strain on cellular networks, alternative plans for exploiting already existing and under-utilized wireless infrastructure, become quite attractive. In this paper, we study cellular-to-mesh (C2M) data offloading for LTE-A cellular mobile users to WiFi mesh networks, which are built and managed collaboratively by users. Such networks are developed in the context of community networks or, recently, as commercial services among residential users. Mobile network operators can lease these mesh networks to offload their traffic and reduce their servicing cost. In this context, we introduce an analytical framework that determines which mobile users should be offloaded, based on the energy cost incurred to the cellular base stations (eNB) for serving their demands. Accordingly, we design a routing policy that the mesh network can employ so as to serve the offloaded traffic with the minimum possible cost. Moreover, the reimbursement offered by the operator should be dispensed to the different mesh users, according to their contribution and added-value significance. We address this issue by employing the Shapley value profit sharing rule, which ensures the participation of the mesh nodes in this joint task. We evaluate our work by simulating the operation of the LTE-A network, and conducting testbed experimentation for the mesh network. The results reveal significant savings for eNBs power consumption and compensation profits for mesh users.

Download paper: Apostolaras-Globecom-2014.pdf

More Articles ...

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  2. Enabling AGILE Spectrum Adaptation in Commercial 802.11 WLAN Deployments
  3. Online Assessment of Sensing Performance in Experimental Spectrum Sensing Platforms
  4. NITOS BikesNet: Enabling Mobile Sensing Experiments through the OMF Framework in a city-wide environment