Wireless Networks for Industrial Automation Process Automation (WIA-PA) is China's national standard for industrial wireless sensor networks. Deterministic scheduling is one of the key technologies for WIA-PA networks. However

current deterministic scheduling algorithms mainly focus on the common wireless sensor networks or WirelessHART and ISA100.11a networks

and they are not optimized for WIA-PA networks. Therefore

an optimal backtracking scheduling algorithm is proposed and achieves the optimal schedulable ratio for WIA-PA networks. And based on this

another deterministic scheduling algorithm called Least Slack First on Time Division Multiple Access (LSF-TDMA) is further presented. Simulation results demonstrate that LSF-TDMA algorithm can meet the deterministic demand of end-to-end data transmissions in WIA-PA networks. It obtains a near-optimal schedulable ratio while effectively reducing the algorithm complexity.