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Delivering wireless ultrahigh-speed access at wider coverage is becomingconsiderably challenging due to the prohibitive investment costs per user andthe necessary shift to range-limited millimeter-wave (mmWave) transmissions.Reconfigurable intelligent surfaces (RIS) are expected to extend the reach ofmmWave and TeraHz signals more cost-effectively in situations where fiberbackhaul and fronthaul are not accessible or infrastructure densification iscostly. This paper investigates some challenges facing this technology,particularly in terms of scalability and the question of what type of RISconfigurations would be appropriate for mmWave networks and what designstrategies can be adopted to optimize the performance and minimize thesignaling overhead. We conclude that RIS configurations for the wirelessinfrastructure likely need to be nonlocal (i.e., redirective,wavefront-selective) rather than local (i.e., reflective) to supportcommunications and networking tasks such as integrated fronthaul and access(IFA) most efficiently.

Nonlocal Reconfigurable Intelligent Surfaces for Wireless Communication: Modeling and Physical Layer Aspects