Publications

Enabling Real World ITS Experimentation in NITOS Future Internet facility

Authors: Nikos Makris, Thanasis Korakis, Dimitrios Katsaros and Leandros Tassiulas

Conference:  IEEE/IFIP WONS 2014, Obergurgl, Austria April 2-4 2014

Abstract: Inter-Vehicle Communication is expected to be widely adopted during the next years by the car industry, enabling Vehicle-to-Vehicle and Vehicle-to-Infrastructure communication targeting at safer commuting. Therefore, the research community have been working towards providing a robust communication solution that will interoperate with existing network infrastructure and will provide an effective way of communicating using location information. One of the proposed solutions is the GeoNetworking protocol, standardized by ETSI, using location based addresses and an IPv6 adaptation sublayer for communicating with the Internet. Several implementations of the protocol exist currently, however most of them are integrated in simulation environments, thus ignoring several factors induced when experimenting under real conditions. In this paper we present our own implementation of an ETSI compliant GeoNetworking protocol and its integration in the NITOS Future Internet facility that enables open and remote access to experimenters on a 24/7 basis. This is the first real implementation in an open wireless testbed, which offers to the research community high diversity in the configuration parameters of their ITS experiments. We further explain our extensions that enable real world testing of our protocol implementation and we finally evaluate our solution in a real large scale wireless setup.

Keywords – ITS; testbed; GeoNetworking; routing;

Download paper: Makris_GeoNetworking_NITOS_WONS2014.pdf

A Demonstation of Multirate Multicast Over an 802.11 Mesh Network

Authors: Georgios S. Paschos, Chih-ping Li, Eytan Modiano, Kostas Choumas and Thanasis Korakis

Conference: INFOCOM, Toronto, Canada, 27 April - 2 May 2014

Abstract: This demo presents a novel multirate multicast scheme for video delivery to wireless users. We demonstrate an adaptive scheme that combines differential backlog scheduling and intelligent packet dropping, both based on local information. An important feature of this scheme is that it does not require centralized calculations. We focus on 802.11 mesh networks and we show that our solution copes efficiently with the volatile nature of the wireless medium. We demonstrate how a video multicast from a single point to multiple receivers could utilize layered multimedia coding techniques to adapt efficiently users’ perceived quality to their allowable data rates.

Download paper: kohoumas_infocom_2014_multirate_demo.pdf

Achieving Efficient Resource Allocation on Non-RF Isolated Wireless Testbed Deployments

Authors: Apostolos Apostolaras, Dimitris Syrivelis, Thanasis Korakis  and Leandros Tassiulas

Conference: Future Network & Mobile Summit, Florence, Italy, June 2010

The building of functional wireless networking system prototypes and the deployment of the respective large scale experiments have become a standard research practice. To that end, wireless testbed support has a significant role: to provide users with an efficient environment that will simplify development and evaluation of observed results. Contrary to wired network media testbeds, wireless deployments face very important challenges, that derive from the unpredicted behaviour of the wireless connectivity which can affect seriously experimental results. In this paper we describe our approach towards the dissemination of wireless bandwidth on our non-RF isolated testbed. Our system is composed of two basic subsystems: i) An existing OSI layer 2 protocol that assesses Topology and Link Quality and ii) A scheduling service that performs fine-grained distribution of wireless bandwidth and prevents user experiments from interfering with each other.

Download paper: ictmobilesummit-paper.pdf

A Demonstration of a Management Tool for Assessing Channel Quality Information in Wireless Testbeds

Authors: Apostolos Apostolaras, Vasileios Miliotis, Nikolaos Giallellis, Dimitris Syrivelis,  Thanasis Korakis  and Leandros Tassiulas

Conference: Tridentcom, Berlin, Germany, May 2010

The gradually growing need for testbed use so as networking algorithms to be validated in real environment, has given rise to optimal utilization of testbed resources. Towards this direction, we present a new management tool that is used for assessing channel quality information in wireless testbed deployments. NITOS Connectivity Tool retrieves data concerning link quality measurements, for providing testbed users with useful information about choosing nodes that occasionally satisfy the requirements (link quality, connectivity) needed, for their  experiments. NITOS connectivity tool is a full-fledged managerial tool that exploits testbed utilization by letting testbed users have a complete view about testbed’s nodes. This tool allows a more sophisticated way to optimally choose network resources of a testbed.

Download paper: cameraReadyDemoPaperTridentcom.pdf