Enhancing Path Selections with Interference Graphs in Multihop Relay Wireless Networks

TL;DR

The paper addresses path selection in RIS-enabled multihop mmWave/THz networks where interference and beam interactions complicate routing. It introduces interference graphs built from an SNR-based model, beam shapes, and an interference model, and evaluates four interference-mapping strategies (ZIM, RCS, DCS, ICS). The results show that increasing-ordered conflict selection (ICS) yields the highest network throughput by effectively controlling cumulative interference, while ZIM performs the worst due to excessive conflicts. The approach offers a practical, scalable framework for interference-aware path selection and motivates routing optimization using interference graphs in high-frequency RIS-enabled mesh networks.

Abstract

The multihop relay wireless networks have gained traction due to the emergence of Reconfigurable Intelligent Surfaces (RISs) which can be used as relays in high frequency range wireless network, including THz or mmWave. To select paths in these networks, the transmission performance plays the key network in these networks. In this paper, we enhance and greatly simplify the path selection in multihop relay RIS enabled wireless networks with what we refer to as interference graphs. Interference graphs are created based on SNR model, conical and cylindrical beam shapes in the transmission and the related interference model. Once created, they can be simply and efficiently used to select valid paths, without overestimation of the effect of interference. The results show that decreased ordering of conflict selections in the graphs yields the best results, as compared to conservative approach that tolerates no interference.

Figures (8)

• Figure 1: Reference network.
• Figure 2: An example of three-hop transmission via two RISs.
• Figure 3: Beam shapes: Conical beam from BS and cylindrical beam from RIS.
• Figure 4: An example of interference analysis.
• Figure 5: ZIM/DCS/ICS/RCS simple flowchart.