Patent ID: 7590091

Claim:
A hybrid mobile communication system for switching a call connection to a CDMA 2000 1X system when a malfunction occurs in a CDMA 2000 1xEV-DO system, the hybrid mobile communication system comprising: a hybrid access terminal operated in a 1X mode in relation to a 1X system for receiving a voice signal transmission service or a low-rate data transmission service from the 1X system and in a 1xEV-DO mode in relation to the 1xEV-DO system for receiving a high-rate data transmission service from the 1xEV-DO system, in which the hybrid access terminal trying a call connection to the 1xEV-DO mode in order to receive the high-rate data transmission service is switched to the 1X mode when receiving a connection deny message from the 1xEV-DO system, thereby carrying out the call connection to the 1X system and receiving the high-rate data transmission service through the 1X system; a 1xEV-DO access network transceiver subsystem for providing the high-rate data transmission service to the hybrid access terminal through an air interface; a 1X transceiver for providing the voice signal transmission service or the low-rate data transmission service to the hybrid access terminal; a 1xEV-DO access network controller for controlling the high-rate data transmission service of the 1xEV-DO access network transceiver subsystem; a 1X controller for controlling the voice signal transmission service or the low-rate data transmission service of the 1X transceiver; a mobile switching center for providing a communication access path by switching to the 1X system in response to a communication call transmitted from the hybrid access terminal; and a packet data serving node (PDSN) for transmitting/receiving high-rate data to/from the 1xEV-DO system in a form of an internet protocol (IP) packet.