A reliable IoT system for Personal Healthcare Devices

Some Personal Healthcare Device data is too precious to lose due to system failures under u-healthcare environments. However, until now, few studies have focused on fault-tolerant health data services. Therefore, we also propose a fault-tolerant algorithm for the reliable IoT system in which gateways on the same layer in the system are linked to form a daisy chain for fault tolerance at the level, and a gateway stores the backup copy of the previous gateway positioned immediately ahead of the gateway in the daisy chain. The upper-layered gateway stores the parity data of the daisy chain as well. In this manner, as many as two gateway faults occurred at the same time can be recovered. For experiments, the resource trees of the oneM2M-based IoT system were expanded to store information on daisy chains, backup copies, and parity. Our experiments reveal that the proposed algorithm can recover from faults on gateways in the oneM2M-based IoT system.