Fifth generation (5G)-industrial Internet of things (IIoT) is the integration of IIoT and a private 5G network. The IIoT is a concept that involves incorporating smart objects, gadgets, and solutions into cutting-edge industrial operations to increase reliability, efficiency, and over-production costs. Furthermore, the integration of IIoT and 5G/beyond 5G (B5G) provides the potential for ubiquitous and instantaneous connectivity. The 5G architecture can handle the IIoT's stringent ultra-low latency, real-time processing, high data rate, nearby storage, and reliability requirements. A new era of economic growth is predicted for IIoT-assisted 5G/B5G wireless networks. It should be noted that the majority of the work in IIoT is focused on the architecture, with reliability and throughput being largely ignored. This paper provides a comprehensive review of B5G assisted IIoT wireless networks, with a focus on enhanced mobile broadband (eMBB) and ultra-reliable low latency communication (URLLC) services. Furthermore, it provides insights into various applications and key enabling technologies from the perspective of URLLC, eMBB, and their tradeoff.Index Terms-Fifth generation (5G), beyond 5G (B5G), sixth generation (6G), industrial Internet of things (IIoT), ultrareliable low latency communication (URLLC), enhanced mobile broadband (eMBB).
I. INTRODUCTIONT HE emergence of industrial Internet of things (IIoT) has revolutionized industrial operations such as manufacturing and production by automating a huge number of connected components and devices. IIoT is a sub-category of Internet of things (IoT) that focuses on the use of IoT techniques and technologies [1]-[4] in industries such as smart cities, smart transportation, smart grid, smart health services, forestry, food, weather, agriculture, monitoring, and surveillance [5]-[18]. The machines/devices in IIoT are connected to capture smartness and autonomy in legacy systems [19]-[21]. It is estimated that by the end of 2030, roughly 80 billion devices will be connected to the Internet [22]-[24]. In IIoT, an increased degree of connectivity is involved, which has special requirements for high reliability, low latency, high speed, more flexibility, and secure communication [25]-[27].