Akademik Veri Yönetim Sistemi
33rd Telecommunications Forum, TELFOR 2025, Belgrade, Sırbistan, 25 - 26 Kasım 2025, (Tam Metin Bildiri)
This paper investigates reconfigurable intelligent surface (RIS) selection in candidate sixth-generation (6G) bands. A single-RIS activation rule that maximizes the end-to-end (e2e) SNR is adopted to capture performance gains while minimizing system overhead. The analysis covers passive (ρ=1) and absorptive (0<ρ<1) operation and employs a frequencydependent path-loss model at 4.6,7.8,15, and 40 GHz. Under double-Nakagami-m fading, closed-form outage expressions are derived and combined with order statistics for RIS selection, then validated by Monte-Carlo simulations. Results show that max-e2e-SNR selection achieves the diversity order and improves reliability as the number of elements N and panels T increase. Absorptive operation introduces an SNR penalty proportional to ρ2, and higher carrier frequencies shift outage curves to the right because of the fc-4 large-scale loss. These findings quantify the reliability-overhead trade-off and provide frequency-aware guidance for RIS deployment.