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The introduction of the mm-Wave spectrum into 5G NR promises to bring aboutunprecedented data throughput to future mobile wireless networks but comes withseveral challenges. Network densification has been proposed as a viablesolution to increase RAN resilience, and the newly introducedIntegrated-Access-and-Backhaul (IAB) is considered a key enabling technologywith compelling cost-reducing opportunities for such dense deployments.Reconfigurable Intelligent Surfaces (RIS) have recently gained extremepopularity as they can create Smart Radio Environments by EM wave manipulationand behave as inexpensive passive relays. However, it is not yet clear whatrole this technology can play in a large RAN deployment. With the scope offilling this gap, we study the blockage resilience of realistic mm-Wave RANdeployments that use IAB and RIS. The RAN layouts have been optimised by meansof a novel mm-Wave planning tool based on MILP formulation. Numerical resultsshow how adding RISs to IAB deployments can provide high blockage resistancelevels while significantly reducing the overall network planning cost.

Boosting 5G mm-Wave IAB Reliability with Reconfigurable Intelligent Surfaces