The Internet Engineering Task Force (IETF) has developed the 6TiSCH architecture to Industrial Internet of Things (IIoT). It is an adopted IoT paradigm for industrial applications with the requirements of reliable and timely communication. In 6TiSCH networks, the scheduling of communication resources, energy-efficient, and secure communication is of paramount importance to meet the IIoT requirements, and previously various scheduling functions have been proposed as per the application requirements.
   Recent research on 6TiSCH networks focuses on autonomous scheduling, which autonomously allocates communication resources. It is important to get prior knowledge about the application traffic patterns and load, and it helps identify different trade-offs between latency and energy consumption. Moreover, it assists in classifying the impact of attackers and network conditions on packet loss during secure communication.