Analysis of transmission modes for ultra-reliable communications

Cellular systems are gaining more attention as a means of connectivity solutions for machine-type communications (MTC). The future cellular systems need to encounter new features in order to meet the diverse requirements of MTC applications. Ultra-reliable with low-latency communications (URLLC) is one of the considered features, required for mission-critical applications. This paper attempts to provide a better understanding of URLLC in the cellular systems. It considers different transmission modes and presents the required signaling and data transmissions. The optimal resource allocations are formulated for data transmissions. In addition, simplified solutions are given in order to reduce the computation complexity of resource allocations.