Resource Allocation for 5G URLLC in Cooperative Industrial Networks

Ultra-reliable and low-latency (URLLC) communication has attracted much attention because of the difficulties in meeting the requirement of extremely high reliability and low latency simultaneously. To reduce latency, short packet transmission is taken into consideration. In this paper, the resource allocation problem for 5G URLLC in cooperative industrial networks is first investigated under short packet transmission. The resource allocation problem is formulated as an integer programming problem with the objective of minimizing the average error probability of the system, while guaranteeing the latency constraint. To solve the challenging problem, a joint optimal relay assignment and blocklength allocation (JRABA) algorithm is proposed, which alternately optimizes the relay assignment and blocklength allocation subproblems. Simulation results validate the effectiveness of the JRABA algorithm that supports the reliable transmission in low latency network by revealing the impact of various system parameters on the average error probability.