Summary

IMT-2020 based fixed mobile convergence (FMC) is one of the main trends in the future development of telecommunications. The main purpose of FMC is to combine all access technologies, including fixed and mobile access method, to access the network without network constraints. When adopting IMT-2020 technologies, software-defined wide- area networking (SD‑WAN) service is required to support IMT-2020 access as one of the multiple connection types. With the enhancements of FMC, an IMT-2020 based SD-WAN service could gain features such as end-to-end isolated connections and duel link transmission. Recommendation ITU-T Y.3139 provides specifications for FMC enhancements to support an IMT-2020 based SD-WAN service.