Publications

Online Energy Consumption Monitoring of Wireless Testbed Infrastructure through the NITOS EMF Framework

Authors: Stratos Keranidis, Giannis Kazdaridis, Virgilios Passas, Thanasis Korakis, Iordanis Koutsopoulos, Leandros Tassiulas

Conference: WiNTECH - MobiCom 2013, Miami, Florida, USA, September 2013

Development of energy-efficient protocols and algorithms requires in-depth understanding of the power consumption characteristics of real world devices. To this aim, energy efficiency analysis is performed by the research community, mainly focusing on the development of power consumption models. However, recent studies have highlighted the inability of existing models to accurately estimate energy consumption even in non-composite scenarios, where the operation of a single device is analyzed. The inability of such models is further highlighted under real life scenarios, where the impact induced by the simultaneous operation of several devices renders the application of traditional models completely inappropriate. As a result, energy efficiency evaluation under complex configurations and topologies, needs to be experimentally investigated through the application of online monitoring solutions. In this work, we propose the innovative NITOS Energy consumption Monitoring Framework (EMF) able to support online monitoring of energy expenditure, along with the experiment execution. The developed framework is built on a distributed network of low-cost, but highly accurate devices and is fully integrated with the large-scale wireless NITOS testbed. Framework evaluation is performed under both low-level experiments that demonstrate the platform’s high-level accuracy, as well as through high-level experiments that showcase how online and distributed monitoring can facilitate energy performance assessment of realistic testbed experiments.

Download paper: Keranidis_NITOS_EMF_WinTECH_2013_paper.pdf

Enabling Mobile Sensing through a DTN Framework

Authors: Vasilis Maglogiannis, Giannis Kazdaridis, Donatos Stavropoulos, Thanasis Korakis and Leandros Tassiulas

Conference: WinTech 2013, Miami, 30 September 2013

Participatory Sensing is the concept of distributed data collection by self-selected participants. By exploiting latest technology's smart devices, a large number of valuable information can be collected through embedded sensors and also be uploaded using provided services. Environmental measurements such as temperature or pollution, while also real-time data considering products information (i.e. prices, availability, o ers), can be provided through such a framework. In this paper we present the NITOS mobile framework for data collection, that exploits vehicles moving around in a city. The proposed framework consists of low-sized wireless devices mounted on volunteers vehicles, as well as of static deployed Road Side Units (RSUs) providing the backbone connection for data acquisition. The extracted measurements concern air temperature and humidity plus the available WiFi networks operating in each area.

Download paper: wintech23d-maglogiannis.pdf

Implementation of a Protocol for Cooperative Packet Recovery Over Hybrid Networks

Authors: Fraida Fund, Thanasis Korakis and Shivendra S. Panwar

Conference: WinTech 2013, Miami, 30 September 2013

In this work, we consider the challenge of delivering high-quality multimedia content to users concentrated in a small physical location, e.g., a sports stadium in which fans may view extra video content on their mobile devices. Because each user experiences a different wireless channel condition, it is difficult to deliver this content efficiently to all users. A hybrid network architecture has been proposed that uses a peer to peer exchange of packets over an assistant network to supplement the primary infrastructure network in this scenario. We describe an implementation of this popular technique which may be used in a variety of network environments and applications. In trials on a wireless networking testbed, using WiMAX as the primary network and WiFi as an assistant network, we find that our implementation can recover up to 92% of packets lost over the primary network.

Download paper: wintech08-fund.pdf

Exploiting OpenFlow Resources towards a CCLAN

Authors: Kostas Choumas, Nikos Makris, Thanasis Korakis, Leandros Tassiulas and Max Ott

Conference:  EWSDN 2013, Berlin, October 10-11 2013

Abstract: The efficient utilization of emerging new technologies for the sake of implementing attracting and novel network architectures is a major research challenge. As traditional addressing schemes seem to be rather inefficient to cope with emerging Internet technologies, research concerning Content Centric Networks (CCNs) has received a lot of attention by the research community. CCNs are designed to treat content as a primitive and therefore overcome the obstacles posed by traditional addressing schemes. Utilizing Software Defined Networking (SDN) approaches can lead to a realistic implementation of CCN scenarios. In this paper, we exploit the OpenFlow (OF) technology, an SDN enabler, in order to efficiently create and manage CCNs which are backward compatible with already existing networking infrastructure. We evaluate our scheme by using different load balancing policies, based on the actual network state at every observation interval. The process is completely transparent to the end user, making our approach an easy to integrate solution for all existing networking topologies. Our solution is implemented and evaluated under a real life scenario, utilizing distributed testbed resources, consisting of the NITOS wireless testbed and PlanetLab-Europe (PLE).

Keywords: Information Centric Networking, Software Defined Networking, OpenFlow, testbed, load balancing

Download paper: kohoumas_ewsdn_2013_cclan.pdf