Summary - Y.3221 (11/2025) - Fixed, mobile and satellite convergence – Local data switching for IMT-2020 networks and beyond

Recommendation ITU-T Y.3221 specifies the requirements, architecture, information flows and security considerations of local data switching for fixed, mobile and satellite convergence (FMSC) in the context of IMT-2020 networks and beyond. Local data switching is a capability that enables the routing and processing of user data traffic locally for users accessing the network. FMSC is the capability that provides services and applications to end users regardless of the fixed, mobile or satellite access technologies being used.