Automatic and seamless vertical roaming between wireless local area network (WLAN) and wireless wide area network (WWAN) while maintaining an active voice or streaming data connection: systems, methods and program products

摘要: A Mobile Station (MS) is able to vertically roam in either direction between two different networks, i.e., WWAN and WLAN. The MS equipped with a dual mode Radio for WLAN transmissions. linked Enterprise Gateway Controller (EGC) via first air link the Base Transceiver (BTS) second link. An outgoing VoIP call from remote party on will transition or seamlessly switch over connection when detects packet error rates, frequent scale back consistent signal degradation.