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In this paper we provide a method to analytically compute the energy saving provided by the use of transmission power control (TPC) at the MAC layer in wireless sensor networks (WSN). We consider a classical TPC mechanism: data packets are transmitted with the minimum power required to achieve a given packet error probability, whereas the additional MAC(More)
— IEEE 802.11 is being currently condisered to develop telecommunications infraestructures in industrial environments. However, in such environments there may be exist a high level of Electromagnetic Fields (EMF) contamination, due to the machinery in use. WLANs are sensitive to this kind of hazard, and therefore the performance of the protocols may be(More)
Wireless Sensor Networks (WSN) are formed by a large number of networked sensing nodes. It is rather complex, or even unfeasible, to model analytically a WSN and it usually leads to oversimplified analysis with limited confidence. Besides , deploying test-beds supposes a huge effort. Therefore, simulation is essential to study WSN. However, it requires a(More)
Improvement of traffic safety by cooperative vehicular applications is one of the most promising benefits of vehicular ad hoc networks (VANETs). However, to properly develop such applications, the influence of different driving parameters on the event of vehicle collision must be assessed at an early design stage. In this paper, we derive a stochastic model(More)
— Simulation is essential in WSN study. However, the nature of WSN makes it an unexpectedly complex task. The extremely large number of nodes, the need for an environment model, and the cross-layer dependecies of the models are some of the reasons for this complexity. Many of the existing simulation tools do not properly handle these issues. In this paper,(More)
The fresh products supply chain still has room to improve and increase efficiency and even become an intelligent supply chain by means of automating simple but valuable data flows which will be the foundations and first stage for developing new value-added services. The Spanish company ECOMOVISTAND has developed an innovative and ecological packaging and(More)
Keywords: Wireless sensor networks Localization techniques Angle-of-arrival Smart antennas Outdoor environments a b s t r a c t Among the large number of contributions concerning the localization techniques for wireless sensor networks (WSNs), there is still no simple, energy and cost efficient solution suitable in outdoor scenarios. In this paper, a(More)
Wireless sensor networks (WSN) are designed for data gathering and processing, with particular requirements: low hardware complexity, low energy consumption, special traffic pattern support, scalability, and in some cases, real-time operation. In this paper we present the virtual TDMA for sensors (VTS) MAC protocol, which intends to support the previous(More)