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In recent years, Vehicular Ad hoc Networks (VANETs) has been emerged an enabling technology to provide a wide range of applications for safety and convenience of drivers. However, traditional architecture of VANETs lack of flexibility, scalability, and easy deployment of services. In this context, Software-defined networking (SDN) has emerged as a rapid innovation in the area of networking for both...
This work analyzes a mmWave single-cell network, which comprises a macro base station (BS) and an overlaid tier of small-cell BSs using a wireless backhaul for data traffic. We look for the optimal number of antennas at both BS and small-cell BSs that maximize the energy efficiency (EE) of the system when a hybrid transceiver architecture is employed. Closed-form expressions for the EE-optimal values...
This paper presents the high-level architecture (HLA) of the research project DEWI (dependable embedded wireless infrastructure). The objective of this HLA is to serve as a reference for the development of industrial wireless sensor and actuator networks (WSANs) based on the concept of the DEWI Bubble. The DEWI Bubble is defined here as a high-level abstraction of an industrial WSAN with enhanced...
In this paper, we propose a hierarchical architecture based on software defined networking (SDN) to manage the physical resources in vehicular ad-hoc networks (VANETs), namely sdnMAC. First of all, a novel roadside unit (denoted by ROFS) is designed, which is an OpenFlow switch equipped with a wireless interface. Then, a hierarchical architecture is proposed for sdnMAC, consisting of two tiers, one...
In this paper we describe how a novel backoff mechanism called Moderated Backoff (MB), recently proposed as a standard extension for 802.11 networks, has been prototyped and experimentally validated on a commercial 802.11 card before being ratified. Indeed, for performance reasons, the time critical operations of MAC protocols, such as the backoff mechanism, are implemented into the card hardware/firmware...
A cloud-based Data Management Platform (DMP) for use in a Ubiquitous Consumer Wireless World (UCWW) environment is presented. By mining the collected raw data, the DMP's goal is to turn ‘big data’ logs of consumers' wireless services access activities into actionable analytic datasets for use in the UCWW consumers supporting in their drive to obtain enhanced Always Best Connected and best Served (ABC&S)...
Challenged networking applications such as rural internet, battlefield communication, post-disaster communication etc. cannot rely on mere DTN for its unpredictable delay and unreliable delivery probability. To meet application specific QoS constraints, in addition to DTN-enabled mobile nodes (smart phones/tablets), an ad hoc backbone infrastructure is essential. Such backbone components include the...
A fundamental but challenging problem in cooperation and control of multiple unmanned aerial vehicles (UAVs) is efficient networking of the UAVs over the wireless medium in rapidly changing environments. In this paper, we introduce four communication architectures for networking UAVs and review some military communication standards applicable to UAV communications. After discussions of pros and cons...
Autonomous wireless networks play an increasingly crucial role in today's society. Harsh environmental conditions, challenging deployment topologies, unreliable (or non-existing) power grids, as well as misguided control procedures of communications infrastructures by governmental authorities have made autonomous communication infrastructures a valuable asset for long-term development and wealth of...
Wireless Sensor Networks (WSNs) are used in many application areas including health, agriculture and gaming. New advances in sensor technology make it pertinent to consider sharing a deployed WSN infrastructure by multiple applications, including applications which are designed after the WSN deployment. For my PhD research I propose a novel WSN virtualization framework that allows multiple users to...
Cloud-based machine-to-machine communications emerge to facilitate services through linkage between cyber and physical worlds. In addition to great challenges in a large network of machine/sensor swarm, effective network architecture involving interconnection of wireless infrastructure and multi-hop ad hoc networking in the machine swarm remains open. Inspired by the small-world phenomenon in social...
During the great east Japan earthquake on March 11, 2011, a lot of ICT resources — telecom switching offices, optical fiber links, and so forth — were completely or partially damaged due to the tremor and the resultant tsunami. As a consequence, the demand for ICT services explosively increased, mainly because the people of the affected areas were trying desperately to communicate with the outside...
In conventional Wireless Mesh Networks (WMNs), multihop relays are performed in the backbone comprising of interconnected Mesh Routers (MRs) and this causes capacity degradation. This paper proposes a hybrid WMN architecture that the backbone is able to utilize random connections to Access Points (APs) of Wireless Local Area Network (WLAN). In such a proposed hierarchal architecture, capacity enhancement...
A cross-layered communication paradigm for integrating search and surveillance applications of Unmanned Aeronautical Ad-Hoc Networks (UAANETs) is proposed. The idea is to accomplish two conflicting applications of UAANETs simultaneously via a single ad-hoc communication architecture. The proposal supports both searching and tracking missions of UAANETs via a unified cross-layer architecture. In order...
When a catastrophic natural disaster occurs, the efficiency of disaster response operation is crucial to life saving. However, communication systems, such as cellular networks, were usually crashed due to various causes that made coordination difficult for many disorganized disaster response workers extremely. Unfortunately, rapid deployment of many existing emergency communication systems relies...
Research in the area of Wireless Sensor Networks (WSNs) has become more and more driven by real-world experimental evaluations rather than network simulation. Numerous testbeds of WSNs have been set up in the past decade, often with very much differing architectural design and hardware. The Testbed Management Architecture for Wireless Sensor Networks (TARWIS) presented in this paper provides the most...
The cloud represents a computing paradigm where scalable virtualized resources are provided ``as a service'' over the Internet. Mobile/wireless clouds of seamlessly integrated wireless networks is the latest technology trend. Moving the ``Test bed as a Service'' notion to the wireless cloud, enables ordering of user slices for experimentation on wireless test beds, scattered across multiple, federated,...
The advanced heterogeneous vehicular network (AHVN) is a new paradigm for future vehicular networks. AHVN is an integrated architecture between the VANET and the existing cellular wireless networks. This paper introduces a vehicular communications framework for efficient Multihop connectivity in AHVN. The vehicular communication in VANET is based on the failure probability of vehicular connectivity...
With the rapid proliferation of wireless services into automotive domain, it is of paramount importance to understand how reliably data can be sent through a custom wireless local area network (WLAN). Thanks to a large body of research, WLAN throughput under saturated and non-saturated traffic condition has been well understood. In this paper, we preset the performance model for ad hoc multimedia...
This paper presents some of the activities currently performed within the EU FP7 E-SPONDER project "A holistic approach towards the development of the first responder of the future". E-SPONDER is a suite of real-time data-centric technologies that will provide enhanced information and communication support to first responders that act during normal and abnormal events. The paper demonstrates...
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