DRAMS: Double-RIS Assisted Multihop Routing Scheme for Device-to-Device Communication

TL;DR

This paper introduces a double-RIS assisted multihop routing scheme for D2D communication that leverages existing RISs and intermediate users capable of energy harvesting, reducing deployment costs and improving reliability.

Contribution

It proposes a novel routing scheme combining RISs and energy-harvesting users as relays, optimizing resource use and reliability in multihop D2D networks.

Findings

Scheme outperforms existing approaches in simulations.

Reduces RIS deployment density while maintaining performance.

Provides insights on maximum delay constraints for reliable transmission.

Abstract

Reconfigurable intelligent surfaces (RISs) is a promising solution for enhancing the performance of multihop wireless communication networks. In this paper, we propose a double-RIS assisted multihop routing scheme for a device-to-device (D2D) communication network. Specifically, the scheme is dependent on the already deployed RISs and users in the surroundings. Besides the RISs, the emphasis of this work is to make more use of the existing intermediate users (IUs), which can act as relays. Hence, the density of RIS deployment in the surroundings can be reduced, which leads to the avoidance of resource wastage. However, we cannot solely depend on the IUs because this implies complete dependence on their availability for relaying and as a result, the aspect of reliability in terms of delay-constrained information transfer cannot be guaranteed. Moreover, the IUs are considered capable of energy harvesting and as a result, they do not waste their own energy in the process of volunteering to act as a relay for other users. Numerical results demonstrate the advantage of the proposed scheme over some existing approaches and lastly, useful insights related to the scheme design are also drawn, where we characterize the maximum acceptable delay at each hop under different set-ups.