In SFC an ordered set of abstract service functions are defined with ordering constraints that must be applied to packets and/or frames and/or flows selected as a result of classification and/or policy, [ITU-T X.1045]. This Recommendation aims to describe the service function chain (SFC) in fixed, mobile and satellite convergence (FMSC) in IMT-2020 networks and beyond. It covers overview on SFC, requirements of SFC, SFC modification, network function enhancements for SFC, and security considerations in FMSC.