Reconfigurable intelligent surfaces (RIS) allow significant throughput enhancement as all reflections have the same phase at the receiver. In this paper, we suggest to optimize packet length for wireless communications using RIS. Two techniques are suggested in order to maximize average or instantaneous throughput. Average throughput maximization requires only the average signal to noise ratio to determine the optimal packet length. The Gradient algorithm is used to maximize the average throughput. Instantaneous throughput maximization requires the instantaneous SNR in order to adapt packet length to channel conditions. We derive in closed form the expression of optimal packet length, maximizing the instantaneous throughput. Our results are valid for any number of reflecting meta-surfaces N of the RIS.

可重新配置的智能表面（RIS）可以显着提高吞吐量，因为所有反射在接收器处都具有相同的相位。在本文中，我们建议为使用RIS的无线通信优化数据包长度。为了最大化平均或瞬时吞吐量，提出了两种技术。平均吞吐量最大化只需要平均信噪比即可确定最佳数据包长度。渐变算法用于最大化平均吞吐量。瞬时吞吐量最大化需要瞬时SNR，以使数据包长度适应信道条件。我们以封闭形式导出最佳数据包长度的表达式，以最大程度地提高瞬时吞吐量。我们的结果对于RIS的任何数量的反射元表面N都是有效的。