Browsing by Author "Ricardo, Manuel"
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- Cross-Layer Admission Control to Enhance the Support of Real-Time Applications in WSNPublication . Pinto, Pedro; Pinto, António; Ricardo, ManuelReal-time monitoring applications may be used in a wireless sensor network (WSN) and may generate packet flows with strict quality of service requirements in terms of delay, jitter, or packet loss. When strict delays are imposed from source to destination, the packets must be delivered at the destination within an end-to-end delay (EED) hard limit in order to be considered useful. Since the WSN nodes are scarce both in processing and energy resources, it is desirable that they only transport useful data, as this contributes to enhance the overall network performance and to improve energy efficiency. In this paper, we propose a novel cross-layer admission control (CLAC) mechanism to enhance the network performance and increase energy efficiency of a WSN, by avoiding the transmission of potentially useless packets. The CLAC mechanism uses an estimation technique to preview packets EED, and decides to forward a packet only if it is expected to meet the EED deadline defined by the application, dropping it otherwise. The results obtained show that CLAC enhances the network performance by increasing the useful packet delivery ratio in high network loads and improves the energy efficiency in every network load.
- Strengthening Marine and Maritime Research and TechnologyPublication . Silva, Eduardo; Martins, Alfredo; Dias, André; Matos, Aníbal; Olivier, Augustin; Pinho, Carlos; Sá, Filipe Aranda de; Ferreira, Hugo; Silva, Hugo; Alves, José Carlos; Almeida, José Miguel; Pessoa, Luís; Ricardo, Manuel; Cruz, Nuno; Dias, Nuno; Mónica, Paulo; Jorge, Pedro; Campos, RuiINESC TEC is strongly committed to become a center of excellence in maritime technology and, in particular, deep sea technology. The STRONGMAR project aims at creating solid and productive links in the global field of marine science and technology between INESC TEC and established leading research European institutions, capable of enhancing the scientific and technological capacity of INESC TEC and linked institutions, helping raising its staff’s research profile and its recognition as a European maritime research center of excellence. The STRONGMAR project seeks complementarity to the TEC4SEA research infrastructure: on the one hand, TEC4SEA promotes the establishment of a unique infrastructure of research and technological development, and on the other, the STRONGMAR project intends to develop the scientific expertise of the research team of INESC TEC.