Sustainability Analysis of Opportunistic CR-IoT Network Employing Microwave Power Transfer

摘要

In this paper, we analyze a Cognitive Radio-based Internet-of-Things (CR-IoT) network comprising a Primary Network Provider (PNP) and an IoT operator. The IoT operator opportunistically accesses the licensed band to serve its IoT nodes. We employ the Microwave Power Transfer technique to harvest energy at IoT nodes for its superior energy transfer efficiency over long-distance. Due to the imperfect detection process, the IoT operator may jeopardize the PNP’s transmissions. To reduce the possibility of interference, the IoT operator may decide not to utilize a portion of perceived white space. Rest are used for data transmission and energy replenishment to maintain a balance between the average interference inflicted on PNP’s users and the Quality-of-Service (QoS) experienced by IoT nodes. The CR-IoT network is sustainable if the QoS requirements are satisfied and IoT nodes are not depleted of energy. We use Discrete Time Markov Chain method to model this framework. In contrast to the generic assumption that activities of PNP and IoT operator are mutually exclusive, our model incorporates possible overlaps between their activities to make it more realistic. Using our model, the sustainability region of the network can be obtained. The accuracy of our analysis is demonstrated via extensive simulation.