This recommended practice provides an SDN-based architecture for multi-radio access technology (RAT ) wireless access networks. It also specifies an SDN-based middleware to support unified and vendor independent control and management of the data plane functions belonging to different RATS, such as wireless local area networks (WLANs), wireless regional area networks (WRANs), and other terrestrial radio access systems [e.g., those defined by the 3rd Generation Partnership Project (3GPP) and International Telecommunication Union Radiocommunication Sector (ITU-R)]. This document also recommends a logically unified multi-RAT control plane function. The control plane function is responsible for control and management of the multi- RAT access network with the help of the proposed middleware.