41 research outputs found
Consistency Analysis of Sensor Data Distribution
In this paper we analyze the probability of consistency of sensor data
distribution systems (SDDS), and determine suitable evaluation models. This
problem is typically difficult, since a reliable model taking into account all
parameters and processes which affect the system consistency is unavoidably
very complex. The simplest candidate approach consists of modeling the state
sojourn time, or holding time, as memoryless, and resorting to the well known
solutions of Markovian processes. Nevertheless, it may happen that this
approach does not fit with some working conditions. In particular, the correct
modeling of the SDDS dynamics requires the introduction of a number of
parameters, such as the packet transfer time or the packet loss probability,
the value of which may determine the suitability of unsuitability of the
Markovian model. Candidate alternative solutions include the Erlang phase-type
approximation of nearly constant state holding time and a more refined model to
account for overlapping events in semi-Markov processes.Comment: IEEE IWCMC 2013, Cagliari, Italy, June 201
Establishing digital molecular communications in blood vessels
In this paper we propose a solution for transmitting digital information
within the cardiocirculatory system. In particular, we make use of a channel
delivering burst of molecules, emitted by mobile transmitters, which diffuse in
the blood towards fixed receivers, that are attached to the vessel walls. This
communication scheme has been inspired by the real signaling between platelets
and endothelial cells, the behavior of which has been investigated
experimentally. We thus believe that our proposal can be successfully deployed
in living bodies. On the basis of the results achieved through simulations on
the communication system capabilities, we propose a simple but effective
receiver scheme, and we outline the future research directions.Comment: First International Black Sea Conference on Communications and
Networking (BlackSeaCom 2013), Batumi, Georgia, July 3-5, 201
Beacon-Based Service Publishing Framework in Multiservice Wi-Fi Hotspots
In an expected future multiaccess and multiservice IEEE 802.11 environment, the problem of providing users with useful service-related information to support a correct rapid network selection is expected to become a very important issue. A feasible short-term 802.11-tailored working solution, compliant with existing equipment, is to publish service information encoded within the SSID information element within beacon frames. This makes it possible for an operator to implement service publishing in 802.11 networks while waiting for a standardized mechanism. Also, this straightforward approach has allowed us to evaluate experimentally the performance of a beacon-based service publishing solution. In fact, the main focus of the paper is indeed to present a quantitative comparison of service discovery times between the legacy scenario, where the user is forced to associate and authenticate with a network point of access to check its service offer, and the enhanced scenario where the set of service-related information is broadcasted within beacons. These discovery times are obtained by processing the results of a measurement campaign performed in a multiaccess/service 802.11 environment. This analysis confirms the effectiveness of the beacon-based approach. We also show that the cost in terms of wireless bandwidth consumption of such solution is low