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Wireless Sensor Networks are characterized by having specific requirements such as limited energy availability, low memory and reduced processing power. On the other hand, these networks have enormous potential applicability , e.g., habitat monitoring, medical care, military surveillance or traffic control. Many protocols have been developed for Wireless(More)
Network Simulators are important tools in network research. As the selected topology often influences the outcome of the simulation, realistic topologies are required to produce realistic simulation results. The topology generator presented in this document, GenSeN, was created based on the authors' knowledge from several experiences. GenSeN is a tool(More)
Multicast potentially optimises bandwidth consumption and node resources, when several users simultaneously participate in a communication session. Nevertheless, contrary to the expectations, IP multicast has not experienced widespread deployment, with the exception of IPTV. On the other hand, emerging Wireless Sensor Network (WSN) applications could(More)
The availability of tools to diagnose Wireless Sensor Network (WSN) failures is a key success factor for this type of networks as already demonstrated by several long-running deployments. By nature, WSNs are resource-constrained, fragile, complex to analyse, and failure-prone. Naturally, with the growing number of installations, it is becoming fundamental(More)
Mobility is one of the most important issues in next generation networks. As wireless sensor networks are becoming the next elements of the future Internet, it is crucial to study new models that also support mobility of these nodes. This paper presents and studies three paradigms to support mobility in sensor nodes. This study is supported by prototyping.(More)
This paper addresses the issue of IP in wireless sensor networks, comparing the use of IPv4 and IPv6. Although a considerable number of studies on wireless sensor networks exist, most of them are based on simulation only. This is not the case of the current paper. In order to validate and complement the simulation studies, this paper presents the(More)
Although, traditionally, mobility has not been supported in Wireless Sensor Networks, many applications in these environments need to interact with each other in highly dynamic scenarios, where configurations can vary from static to dynamic. Sensors phenomena, observers and even the network itself can present different levels of mobility. This mobility in(More)
This paper examines the QoS of an energy efficient cluster based routing protocol called Low-Loss Energy Aware Routing Protocol (LLEAP) in terms of network lifetime and aims some modifications on this protocol to increase its performance. Biological inspired algorithm helps to enhance the performance parameters of LLEAP. A survey on network protocols for(More)
This paper presents Hermes, a new modular platform that can be used in a variety of scenarios, including the role of body area network coordinator, enabling temperature, movement and heartbeat sensing, local and remote communication, and indoor and outdoor localization. Hermes is based on two main modules that can operate as a single system in a coordinated(More)