Deterministic Scheduling With Packet Aggregation in Industrial Internet of Things
Heng Wang, Jianglin Hu, Shuai Tan, Tong Shi · 2020
Industrial Internet of Things (IIoT) is deployed in harsh manufacturing environment for the data exchange between various industrial devices. The wireless network is one of important components of the IIoT. In the industrial wireless networks, packets usually have strict deadlines due to the control relations between sensors and actuators. How to schedule the transmissions of packets and data flows to meet their stringent deadline constrains, becomes a key challenge for IIoT. Meanwhile, packet aggregation mechanism is widely used in industrial wireless networks to reduce the network overhead. Considering that transmissions conflicts will increase when the data flows are close to the gateway, we proposed deterministic scheduling schemes which support packet aggregation to satisfy the deterministic transmission requirement of the data flows. The proposed methods include main link scheduling and additional aggregate link scheduling. We then present three schemes to select the additional aggregate links from different perspectives. Simulation results show significant improvement on the performance of the schedulable ratio.