Abstract: Due to the characteristic of flexibility, low cost and high efficiency, reconfigurable intelligent surface (RIS) is viewed as one of the promising technologies of the 6th generation mobile communication system. In this paper, a RIS-assisted short packet communication system is proposed to improve the performance of short packet communication-. Based on the finite blocklength coding theorem, queuing theory and effective capacity theory, the statistical delay violation probability of the RIS-assisted short packet communication system is analyzed and the closed-form expression is obtained. Moreover, based on the physical layer security, the ergodic secrecy transmission rate of the RIS-assisted short packet communication system is analyzed and the closed expression is obtained. The closed expression of the ergodic secrecy transmission rate under the condition of a high signal-to-noise ratio is obtained. Monte Carlo simulations are provided to confirm the theoretical analysis results. From the results, we obtain that the statistical delay violation probability of short packet communication system can be effectively reduced and the ergodic secrecy transmission rate can be improved by increasing the number of RIS units and deploying the RIS close to transmitter or receiver.

Key words: reconfigurable intelligent surface, short packet communication, statistical delay violation probability, ergodic secrecy transmission rate