Isabelle Augé-Blum

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IETF ROLL has recently proposed gradient routing as a fundamental building block for data collection in Wireless Sensor Networks. This paper seconds this choice by presenting an implementation of gradient routing on current hardware, and by showing experimentally that gradient routing is robust against topological changes. To stress its self-healing(More)
For energy constrained wireless sensor networks, lifetime is a critical issue. Several medium access control protocols have been proposed to address this issue, often at the cost of poor network capacity. To address both capacity and energy issues, we propose a novel medium sharing protocol for Wireless Sensor Networks named Cascading Tournament (CT-MAC).(More)
Geographic routing has received an increasing attention in the context of Wireless Sensor Networks since it frees the network from the energy-demanding task of building and maintaining a structure. It requires however each node to know its position, which may be a prohibitive assumption for many applications. To this end, some prior work has focused on(More)
Many wireless sensor network applications are emerging nowadays. For critical, safety related applications, the network needs to provide bounded transmission delays. Hard real-time guarantees need therefore to be given by wireless sensor network communication protocols. In this paper, we propose a new hard real-time MAC protocol, and we give the time(More)
In the field, Wireless Sensor Networks face the harsh reality of radio physics, including asymmetric and long-range transient links. Classic routing schemes are hindered by these links, and therefore prune them from the network topology. In this paper, we investigate how to put these opportunistic wireless links to good use and actually provide higher(More)
Routing in a multi-hop wireless network with lowcost nodes is still a challenging task, and specific ultra-low power solutions need to be investigated for WSNs. Geographic routing protocols have been designed, analyzed and simulated. Yet, early experimental trials show that they fail dramatically when faced with real-world constraints such as lossy links.(More)
Several wireless sensor network applications are currently appearing in various domains. Their goal is often to monitor a geographical area. When a sensor detects a monitored event, it informs a sink node using alarm messages. The area surveillance application needs to react to such an event with a finite, bounded and known delay: these are real-time(More)