Research papers in 6TiSCH communication architecture for Industrial Internet of Things (IIoT) focus on integrating time-slotted channel hopping (TSCH) with IPv6 over low-power wireless personal area networks (6LoWPAN) to provide deterministic, reliable, and energy-efficient communication for industrial applications. The 6TiSCH architecture combines IEEE 802.15.4e TSCH at the MAC layer with the IETF 6LoWPAN and RPL protocols to enable scheduled, collision-free transmissions, low latency, and high resilience to interference and multipath fading. Researchers have explored its suitability for industrial environments, where real-time control, low packet loss, and predictable latency are critical for automation, monitoring, and process optimization. Studies address scheduling strategies, including centralized, distributed, and hybrid scheduling, to optimize slot allocation, throughput, and energy consumption. Security mechanisms are also investigated, including lightweight encryption, authentication, and intrusion detection to protect IIoT traffic against eavesdropping, spoofing, and replay attacks. Performance evaluations often focus on reliability, end-to-end latency, jitter, network scalability, and energy efficiency under varying network densities and traffic patterns. Recent works integrate 6TiSCH with edge and fog computing, software-defined networking (SDN), and machine learning techniques to enable adaptive scheduling, predictive maintenance, and intelligent traffic management. Despite its advantages, challenges remain in designing scalable slot management for dynamic topologies, supporting mobility, and ensuring interoperability with legacy industrial networks. Overall, the literature highlights that 6TiSCH communication architecture provides a robust, deterministic, and energy-efficient foundation for IIoT, enabling reliable and secure industrial automation in resource-constrained wireless networks.