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We study the problem of supporting simultaneous query in WSNs. For such networks, the network efficiency can be significantly improved if the poller can obtain information via a simultaneous query. Two fundamental cases of such queries are studied in this paper: counting and identifying active neighboring nodes. We propose two mechanisms, Power based counting (Poc) and Power based identification (Poid),...
One fundamental question in Wireless Rechargeable Sensor Networks (WRSNs) is the energy provisioning problem, i.e., how to deploy energy sources in a network to ensure that the nodes can harvest sufficient energy for continuous operation. Though the potential mobility of nodes has been exploited to reduce the number of sources necessary in energy provisioning problem in existing literature, the non-negligible...
IEEE 802.11 DCF protocol exhibit severe fairness problem in many scenarios. In this paper, the reasons why fairness problem appears is given and proved by simulation. The study reveals that the interference among contending MAC flows is different when fairness problem happens. This paper consider that different interference between MAC flows cause the DCF unfair. A parameter named FI (Fairness Indicator)...
Cyber-Physical Systems require the integration of various heterogeneous networks. To evaluate proposed algorithms in network research, real-world test beds are an indispensable complement to simulations. In this paper, we present a flexible heterogeneous mesh networking platform (FHMESH) which interconnects various heterogeneous networks, i.e. wireless sensor network, wireless mesh network, FM radio...
We study the scaling capacity of wireless sensor networks in case of multiple gateways are presented. In such a heterogeneous network, many gateways are needed to gather data from the sensor nodes in network. Different from the previously studied single-gateway model, our proposed gateway access model allows multiple gateway nodes being seamlessly connected with high speed wire-line or wide-band radios...
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