FAS-RIS URLLC Communication Systems

The ultra reliable low latency communications (URLLC) scheme enhances stringent latency and reliability requirements for Internet of Things (IoT) communication systems. In this paper, we investigate a fluid antenna system (FAS)-reconfigurable intelligent surface (RIS) downlink URLLC communication systems, which consists of a base station (BS) equipped with a single fixed-position antenna, a RIS with M reflecting elements and a user equipped with a single fluid antenna (FA) for signal receiving. We derive the analytical expressions for the average block error rate (BLER). Numerical results illustrate that our theoretically derived analytical average BLERs are almost the same as the simulation results. Furthermore, the results demonstrate that the FAS-RIS URLLC system significantly outperforms other configurations.