Roaming method in the environment is that WCDMA mobile communication system and CDMA mobile communication system overlap and, dual-mode mobile phone using the method

摘要

The present invention uses the CDMA mobile terminal in the form of a multi-mode , each having a CDMA modem and WCDMA modem in the communication system and the WCDMA mobile communication system will be described for the nested environment roaming method for performing roaming . ; If a roaming method according to the present invention by a ping-pong phenomenon in which the respective modem is activated at the same time can be prevented . Thus , out of service according to the mode conversion of the multi- mode terminal reduces the time and power consumption .