Wireless terminals and methods that can acquire a CDMA system while continuing to receive paging messages from an AMPS system

摘要

Multiple-mode AMPS system/CDMA system wireless terminals attempt to acquire the CDMA system independent of receiving a Global Action (GA) overhead message from the AMPS system, while continuing to receive paging messages from the AMPS system. In response to the attempt being successful, the multiple-mode AMPS/CDMA wireless terminals transition from the AMPS system to the CDMA system. The attempting may be performed by receiving paging messages from the AMPS systems during spaced apart time intervals and attempting to acquire the CDMA system between the spaced apart time intervals. Specifically, a paging message may be received from a first frame of an AMPS control channel of the AMPS system and an AMPS sleep mode is entered thereafter. CDMA pilot acquisition data may be accumulated during the AMPS sleep mode. These operations may be repeated for second and subsequent frames of the AMPS control channel, until sufficient CDMA pilot acquisition data is accumulated to acquire the CDMA pilot and/or the CDMA System ID (SID) field.