ETOR: Energy and Trust Aware Opportunistic Routing in Cognitive Radio Social Internet of Things

In recent years, the Social Internet of Things (SIoT) has become a research hot topic in the field of wireless networks, which are inseparable relationships between human and devices. As a huge numbers of heterogeneous devices will be connected, it needs more frequency spectrum. The Cognitive radio (CR) technology can improve spectrum utilization in an opportunistic communication manner. However, dynamic spectrum availability and heterogeneous devices make it more difficult for routing design in CR-SIoT. Opportunistic routing (OR) can mitigate drawbacks from CR-SIoT, which leverages the broadcast nature of wireless channels. In this work, we propose an energy and trust aware OR in CR-SIoT, which jointly considers energy efferent, trust and social feature for designing secure OR. In the proposed scheme, we exploit a new routing metric for selecting forwarding candidates and use network coding for the data transmission between trust nodes in multiple types of flows SIoT. In addition, we propose a game-theoretic approach to allocate channel for SIoT which is based on interference factor. Extensive simulation results show that the proposed secure opportunistic routing performs better compared with existing routing in SIoT in terms of packet delivery ratio, network lifetime and average delay. To the best of our knowledge, the proposed routing scheme is the first OR in SIoT.