Link-Correlation-Aware Opportunistic Routing In Low-Duty-Cycle Wireless Networks

With the vigorous development of internet and Io T(Internet of Things),wireless sensor networks(WSNs)are receiving more and more attention and gradually changing people's lifestyles.As one of the most widely used protocols for WSNs,the opportunistic routing is widely used in many high-level protocols,military,intelligent transportation,environmental and health monitoring.In WSNs,existing work on opportunistic mainly focus on node-always-awake wireless network,and the research on low-duty-cycle network is less.This paper proposes LDC-COR,a novel link-correlation-based node scheduling scheme for opportunistic routing in low-duty-cycle WSNs,where both unreliable and correlated links commonly exist.Instead of the traditional routing protocols,the sender collects the information of link quality and link correlation among its one-hop neighboring nodes,and exploits these information to cluster its neighboring nodes.The key idea consists of two parts: one is clustering that a sender node groups its one-hop neighboring nodes based on the information of link correlation and link quality,fully exploiting the reception diversity of candidate forwarder set in order to minimal the expected transmission count(ETX);the other is re-scheduling,which is to make the nodes within the same group be assigned within a common awake time slot in their working schedules so that they can forward the packets simultaneously.We evaluate the performance of LOC-COR using extensive simulations and physical wireless testbed consisting of 20 Telos B nodes,experiment is to control the link quality,network size,network density and other variables to observe the performance of the algorithm.According to the experimental results,the LDC-COR algorithm performs better than the traditional opportunistic routing protocol in terms of transmission efficiency,transmission time,and energy loss under low duty cycle wireless network environment.