Mobile crowd sensing architectural frameworks: A comprehensive survey

Mobile Crowd Sensing has emerged as a new sensing paradigm, efficiently exploiting human intelligence and mobility in conjunction with advanced capabilities and proliferation of mobile devices. In order for MCS applications to reach their full potentials, a number of research challenges should be sufficiently addressed. The aim of this paper is to survey representative mobile crowd sensing applications and frameworks proposed in related research literature, analyze their distinct features and discuss on their relative merits and weaknesses, highlighting also potential solutions, in order to take a step closer to the definition of a unified MCS architectural framework

Joint packet retransmission and spectrum sensing for cognitive radio networks

We model and simulate a joint design of packet retransmission through a hybrid automatic repeat request (HARQ) protocol at the data link layer and spectrum sensing (SpSe) at the physical layer for cognitive radio networks (CRNs). We assume an adaptive modulation scheme at the physical layer that is incorporated with the SpSe and we focus on the maximization of the average spectral efficiency that is affected by both the number of retransmissions of the HARQ protocol and the probability of detection of the SpSe mechanism. The optimal results demonstrate the tradeoff between these two key parameters. We depict the optimal operational points, where the performance is maximized, using convex hull methodology. © 2014 FESB, University of Split

An Information Brokerage Service Architecture for Electronic Commerce

The number of on-line structured information sources especially over the Internet is rapidly increasing. These sources include mainly commercial databases on product information which are exploited from various enterprises to form the so-called "electronic stores" or "virtual shopping malls". However it is still often a burden for the users to locate the "right" information sources and even harder and very time consuming if they want to compare the characteristics of similar or identical items. On the other hand, service providers often encounter practical difficulties in advertising their offers efficiently. The ABS (Architecture for Information Brokerage Services) project is dealing with the definition and implementation of a generic brokerage architecture aiming in providing unified access to distributed, heterogeneous information sources in the context of the emerging "global market" by efficiently supporting it's potential actors (users and content providers). In this paper we des..

Management and performance of virtual and execution environments in FAIN

Next generation network nodes are required to function within heterogeneous network environments, where new services and protocols are rapidly deployed on demand. In such emerging environments, traditional node architectures that offer a predetermined and preloaded set of services, are increasingly incapable of coping with these new requirements. Accordingly, there is a need for new node architectures that offer higher degrees of flexibility measured by their capability to extend the functionality of the node and change its behaviour on demand. This paper makes use of programmable and active network technologies as developed during the FAIN project', to present a novel secure active node architecture, called the FAIN node architecture, capable of supporting virtual environments (VEs) for the allocation of the required amount of resources in which new services are dynamically deployed together with their entire execution environments (EEs). To this end, multiple VEs and services run simultaneously and interact securely with the node resources and mechanisms through open interfaces and the FAIN node management framework. We also present the implementation of the FAIN node architecture and two case studies that demonstrate its extensibility aspects and novel features