A virtualized Open Wireless Architecture (OWA) layer is designed between the physical transmission layer and the user application and operating system (OS) layers to provide a converged open radio transmission platform, and provide a solution to make the application and OS layers to be totally independent to the wireless transmission layer. The OWA virtualization layer defines the portable wireless air-interface modules corresponding to the physical radio transmission technologies (RTTs) to enable the flexible change of different RTTs by an external memory card, and facilitates the visitor OS operable upon the host OS of the mobile terminal device to support seamless handover and switch between different OS platforms.