Adaptive Contention-based Random Access for Uplink Reporting in 3GPP Ambient IoT Networks. - David E. Ruíz-Guirola; Samer Nasser; Bikramjit Singh; Henrique Duarte Moura; Andrey Belogaev; Jeroen Famaey; Efstathios Katranaras; Mahdi Shahabi; Onel L. Alcaraz López (CoRR, 2026)