MODE SWITCHING METHOD OF MULTI-MODE MULTI-BAND MOBILE COMMUNICATION TERMINAL BETWEEN CDMA NETWORK AND WCDMA NETWORK

摘要

The present invention relates to a synchronous-asynchronous mode switching method of a multimode-multiband mobile communication terminal. When the synchronous-asynchronous mode switching command is received from a synchronous mobile communication network, the asynchronous signal is switched to an asynchronous signal. Searching for a first step; A second step of determining whether to search for an asynchronous signal and whether to register a location on an asynchronous mobile communication network; A third step of switching to a synchronous mode when the asynchronous signal is not searched or the location registration to the asynchronous mobile communication network is not performed; Determining whether the access base station has been changed, and comparing the base station change count with the reference base station change count M; If the base station change count is more than the base station change count (M), the asynchronous signal search period is initialized and fed back to the first step.If the base station change count is smaller than the reference base station change count (M), the asynchronous signal search count (n) is asynchronous. A fifth step of determining whether the signal has a maximum number of search times N _max ; If the asynchronous signal search frequency (n) is more than the asynchronous signal maximum search frequency (N _max ), the asynchronous signal search process is terminated by maintaining the synchronous mode.If the search frequency (n) is less than the maximum search frequency (N _max ), the search frequency determining a asynchronous signal search period according to (n) and driving a timer; A seventh step of returning to the first step when the timer passes the asynchronous signal search period; There is a technical feature made to include.