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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)
Many issues still remain to be addressed in order to achieve acceptable security in Wireless Sensor Networks (WSNs). This necessity, together with the adoption of IPv6 on WSNs being defined at the 610wpan lvorking group of the IETF, motivates our investigation on the feasibility of the application of IPSec on sensor nodes. IPSec is already part of IPv6,(More)
Mobile Code is an emerging paradigm that is gaining momentum in several elds of application. Network Management i s a p o-tential area for the use of this technology, provided it will be able to interoperate with well established solutions for Network Management. This paper presents the integration a classic NM protocol, like SNMP, into a platform of Mobile(More)
In this paper we analyse the provision of enhanced communications between vehicles. It is expected that vehicles will have several communication devices, and that a specialised node will provide external connectivity to these devices, i.e. the devices in the vehicle form a Mobile Network. We propose the use of Network Mobility communication solutions for(More)
Over the last couple of years we have been working on the development of mobile agents systems and its application to the areas of telecommunications and network management. This work path produced positive results: a competitive mobile agent platform was built, the run-time benefits of mobile agents were proved, and our industrial partners have developed(More)
Per-hop behaviours capable of supporting different traffic classes are essential for the provision of quality of service (QoS) on the Internet according to the Differentiated Services model. This paper presents an approach for supporting different traffic classes in IP networks, proposing a new per-hop behaviour called D3-Dynamic Degradation Distribution.(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)
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)
At the Laboratory of Communications and Telematics of the University of Coimbra we have been working on the IP QoS field. Our work includes researching, testing and implementing mechanisms that can be used on current IP networks in order to make them able to provide different performance levels to traffic with different QoS needs. Our work is being(More)