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Modeling Reconfigurable Intelligent Surfaces-aided Directional Communications for Multicast Services
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  • Nadezhda Chukhno ,
  • Olga Chukhno ,
  • Nadezda Chukhno ,
  • Sara Pizzi ,
  • Antonella Molinaro ,
  • Antonio Iera ,
  • Giuseppe Araniti
Nadezhda Chukhno
University Mediterranea of Reggio Calabria

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Olga Chukhno
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Nadezda Chukhno
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Sara Pizzi
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Antonella Molinaro
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Antonio Iera
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Giuseppe Araniti
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According to the 6G vision, the evolution of wireless communication systems will soon lead to the possibility of supporting Tbps communications, as well as satisfying, individually or jointly, a plethora of other very stringent quality requirements related to latency, bitrate, and reliability. The achievement of these goals will naturally raise many research issues within radio communications. In this context, a promising 6G wireless communications enabler is the reconfigurable intelligent surface (RIS) hardware architecture, which has already been recognized as a game-changing way to turn any naturally passive wireless communication setting into an active one. This paper investigates RIS-aided multicast 6G communications by first modeling the system delay as a first-come-first-served (FCFS) M/D/1 queue and analyzing the behavior under different blockage conditions. Then the study of multi-beam operation scenarios, covering multicast and RIS-aided multicast communications, is conducted by leveraging an M/D/c queue model. Achieved results show that large-size RISs outperform even slightly obstructed direct BS-to-user paths. In contrast, RISs of smaller sizes require the design of sophisticated power control and sharing mechanisms to achieve better performance.