Distributed RIS Control Approach for Real Environments with Dynamic Blockage

Applying reconfigurable intelligent surfaces (RIS) to control propagation channels effectively can lead to more efficient 5G networks in terms of both spectrum and energy utilizations. However, the increase in the number of RISs leads to a corresponding rise in power consumption. This paper proposes a novel control method for distributed-RISs by considering a system configuration in which multiple RISs are deployed within the coverage area of a single 5G mmWave BS under dynamic blockage scenarios. The proposed method adaptively selects deployed distributed RISs based on the radio environment to enhance wireless communication quality while simultaneously reducing the power consumption of RISs, thereby contributing to the realization of green 5G mmWave networks. Through ray-trace simulations conducted in the urban environment of Shibuya, Tokyo, we evaluate the effectiveness of the proposed method. The results confirm that it improves received power while achieving approximately a 60% reduction in power consumption.