Flat UP: Toward RAN-Core Convergence for the 6G User Plane. - Hasanin Harkous; Ahan Kak; Alistair Urie; Heiko Straulino; Huanzhuo Wu; Matti Laitila; Huu-Trung Thieu; Nakjung Choi; Thierry Van De Velde; Mikko Kanerva (IEEE Commun. Mag., 2025)