Patent ID: 7529206

Claim:
A system for notifying a CDMA 2000 1xEV-DO system of switching from a 1xEV-DO mode into a 1X mode when a hybrid access terminal is switched into the 1X mode, the system comprising: the hybrid access terminal operated in the 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 the 1xEV-DO mode in relation to the 1xEV-DO system for receiving a high-rate data transmission service from the 1xEV-DO system, the hybrid access terminal in traffic with the 1xEV-DO system being periodically switched into the 1X mode in order to update an overhead message while transmitting a predetermined signal notifying the 1xEV-DO system of switching of the hybrid access terminal from the 1xEV-DO mode into the 1X mode; a base station transceiver subsystem including a 1x EV-DO access network transceiver for transmitting/receiving packet data to/from the hybrid access terminal and a 1X transceiver for transmitting/receiving voice or data to/from the hybrid access terminal; a base station controller including a 1xEV-DO access network controller for controlling a packet data transmission service of the 1xEV-DO access network transceiver and a 1X controller for controlling a transmission service of the 1X transceiver; and a packet data serving node (PDSN) connected to the 1xEV-DO access network controller so as to transmit/receive the packet data to/from the 1xEV-DO system.