Node Scheduling for Localization in Heterogeneous Software-Defined Wireless Sensor Networks
In this paper, a node scheduling scheme for localization in heterogeneous software-defined wireless sensor networks (SD-WSNs) is proposed. An expression to evaluate the connectivity degree of the localized agent is derived, which is used to judge if the agent is connected with an expected number of anchors. The node scheduling scheme is designed on the basis of the software-defined networking (SDN) paradigm, and the state of each anchor is determined by the SDN controller through a flow table via sensor OpenFlow. In the proposed scheme, a timer for each anchor is calculated based on the Cramer-Rao lower bound (CRLB) value and the residual energy. Simulations show that the proposed node scheduling scheme can reduce the number of active nodes while ensuring an expected number of anchors for localization. It can also be shown that the scheme can reduce the energy consumption with only a slight decrease in positioning accuracy.
KeywordsNode scheduling Localization Heterogeneous wireless sensor network Software-defined networking
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