In 1xEV-DO traffic state, converting to the 1X system, the hybrid portable communication system and prevent call connection cancellation method and the hybrid terminal which limit the overhead message which it renews, prevent the cancellation of call connection

摘要

The present invention relates to a method and system for preventing a call drop by limiting a search time of a 1X system while in traffic with a 1xEV-DO system. The system comprises: a hybrid access terminal, supporting both a 1xEV-DO system and a 1X system, for periodically switching over to the 1X system and receiving an overhead message while in traffic with the 1xEV-DO system, and switching back to the 1xEV-DO system upon receiving a prescribed overhead message a base station transceiver subsystem for exchanging a voice data or a packet data with the hybrid access terminal a mobile switching center for providing a communication path for the hybrid access terminal; and a packet data serving node connected to the 1xEV-DO controller for exchanging the packet data with the 1xEV-DO system.