On the Impact of Routers' Controlled Mobility in Self-Deployable Networks

International audienceA substitution network is a temporary network that self-deploys to dynamically replace a portion of a damaged infrastructure by means of a fleet of mobile routers. In this paper, we evaluate the performance of a previous self-deployment scheme, adaptive positioning algorithm (APOLO), for substitution networks and we show the benefit of the controlled mobility in such a network. To that end, we evaluate APOLO in terms of throughput under several scenarios and different metrics. These results constitute a comprehensive evaluation of APOLO and enable to envision new ways of optimization and future paths of research. We prove that APOLO is an efficient deployment and redeployment algorithm for mobile relay networks

Fast and reliable robot deployment for substitution networks

International audienceIn this paper, we propose an algorithm to efficiently (re)-deploy the wireless mobile routers of a substitution network by considering the energy consumption, a fast deployment scheme and a mix of the network metric. We consider a scenario where we have two routers in a fixed network and where connectivity must be restored between those two routers with a wireless mobile router. The main objective of the wireless mobile router is to increase the communication performance such as the throughput by acting as relay node between the two routers of the fixed network. We present a fast, adaptive and localized approach which takes into account different network metrics such as Received Signal Strength (RSS), Round-Trip Time (RTT) and the Transmission Rate, between the wireless mobile router and the two routers of the fixed network. Our method ameliorates the performance of our previous approach from the literature by shortening the deployment time, increasing the throughput, and consuming less energy in some specific cases

A Survey on Rapidly Deployable Solutions for Post-disaster Networks

International audienceIn post-disaster scenarios, for example, after earthquakes or floods, the traditional communication infrastructure may be unavailable or seriously disrupted and overloaded. Therefore, rapidly deployable network solutions are needed to restore connectivity and provide assistance to users and first responders in the incident area. This work surveys the solutions proposed to address the deployment of a network without any a priori knowledge about the communication environment for critical communications. The design of such a network should also allow for quick, flexible, scalable, and resilient deployment with minimal human intervention

Wireless Network Intrinsic Secrecy

Wireless secrecy is essential for communication confidentiality, health privacy, public safety, information superiority, and economic advantage in the modern information society. Contemporary security systems are based on cryptographic primitives and can be complemented by techniques that exploit the intrinsic properties of a wireless environment. This paper develops a foundation for design and analysis of wireless networks with secrecy provided by intrinsic properties such as node spatial distribution, wireless propagation medium, and aggregate network interference. We further propose strategies that mitigate eavesdropping capabilities, and we quantify their benefits in terms of network secrecy metrics. This research provides insights into the essence of wireless network intrinsic secrecy and offers a new perspective on the role of network interference in communication confidentiality.Marie Curie International Fellowship (Grant 2010-272923)Seventh Framework Programme (European Commission) (Project CONCERTO Grant 288502)Copernicus FellowshipNational Science Foundation (U.S.) (Grant CCF-1116501)United States. Office of Naval Research (Grant N00014-11-1-0397)Massachusetts Institute of Technology. Institute for Soldier Nanotechnologie

Service-oriented Wifi connectivity maintenance with a mobile AP

We consider the problem of providing continuous wireless connectivity to mobile Wi-Fi users via a mobile access point (MAP). In traditional infrastructure Wi-Fi networks, mobile users may experience poor or no connectivity when they are away from an access point (AP) and/or there is an interfering obstacle in between. The connectivity is affected by the factors such as type of data traffic (like interactive, responsive, timely, and non-critical) or ambient conditions e.g., interference and distraction/refraction due to obstacles. In proposed approach, the quality of the connection is measured by the value of received signal strength (RSSI). If RSSI at a client is lower than a pre-specified threshold, a MAP acts as a relay node, and forwards the traffic from the AP to mobile clients instead of direct communication. MAP dynamically relocates in order to satisfy a service oriented level of connection quality. In our approach, the routing is performed at the MAC layer, so the network layer is unaware of the change in routing path. Simulation results demonstrate that the proposed approach provides continuous connectivity to the clients at the cost of a low end-to-end average delay