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WirelessHART is a networking technology that is widely used in industrial wireless sensor networks. Its reliability and real-time performance are essential to industrial production. Many works have studied these two aspects, primarily focusing on a single WirelessHART network. However, multiple WirelessHART networks usually coexist in a real industrial environment. Applying existing approaches to...
Energy-efficient dynamic resource control problem in buffer-aided hybrid sensor networks is investigated, where each sensor with one buffer is introduced for data storage. The considered problem is formulated as a stochastic optimization problem, which jointly considers the quality-of-service requirements and dynamic characteristics. The Lyapunov optimization theory is applied to transform the intractable...
In this paper, we formulate coverage requirements of the sensor network as a minimum-cost connectivity guaranteed point k-coverage problem. An improved ant colony algorithm (EasiDesign) is proposed to achieve the approximate solution to this optimization problem. We made modifications in the convergence strategy and the ant state transition rule of the general ant colony optimization. Considering...
Cooperative transmission technique is now widely considered as a promising approach to combat fading and achieve energy efficiency in wireless networks. In this paper we focus on the routing problem in energy-constrained wireless sensor networks (WSNs), of which a cooperative MISO-based routing strategy is adopted. We first analyze the physical layer energy consumption model of cooperative transmission...
Resource constraints make it considerably difficult to implement and optimize cryptography algorithms on sensor nodes. In order to provide guidelines for design, it is necessary to predict overheads of these algorithms without final implementations and optimizations. In this paper, a mathematical model based on overheads of basic operations frequently used in cryptography algorithms is presented for...
Security is a critical factor to deploy large scale wireless sensor networks. Limited resource constraints, such as computation power, program memory, SRAM, and energy budget, present a big challenge to implement existing cryptography algorithms. In this paper, we evaluate the overhead of comprehensive cryptography algorithms suitable for wireless sensor networks. All the factors that may affect algorithm...
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