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We consider the problem of reliable and minimal delay transmission in a wireless sensor network that uses time division in order to schedule its node-to-node communication in time-bounded manner. We propose an algorithm that uses the message acknowledgment method and solves this problem. We show bounds for its expected value of message delivery time. Moreover, our algorithm is based on simple state...
In this paper, we propose a novel method of solving the averaging problem for distributed Wireless Sensors Networks. This method is based on approximated histograms of measurements made by a sensor network. Our method uses a set of probabilistic counters and allows to find the approximation of the average of a set of measures done by sensor network with arbitrary, controlled by two parameters, precision...
In this paper we discuss a two-phase algorithm for estimating the size of a wireless network consisting of weak devices, such as Wireless Sensor Networks (WSN). The main idea is based on employing randomly generated identifiers. In the first phase of the algorithm we use the properties of order statistics and calculate an approximate estimator of the number of nodes. In the second phase we use this...
Efficient cardinality estimation is a common requirement for many wireless sensor network (WSN) applications. The task must be accomplished at extremely low overhead due to severe sensor resource limitation. This poses an interesting challenge for large-scale WSNs. In this paper we present a two-phase probabilistic algorithm based on order statistics and Bernoulli scheme, which effectively estimates...
We propose a solution for privacy problems regarding use of electronic identification tags such as RFID's. In our scheme the ID tag changes at random driven by its internal circuitry during each activation. The changes are small enough so that the legitimate system can recognize the tag and register the modified ID for the next activation. On the other hand, after a certain number of activations the...
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