| 摘要 |
A dual-mode wireless telephone communications system, having a digital wireless communications system (e.g., CDMA) and a second wireless communications system, selectively outputs a rescan command from the digital wireless system to at least one selected dual-mode wireless telephone. The digital wireless communications system outputs the rescan command based on a detected traffic condition in the digital wireless system. The rescan command, output to the selected dual-mode wireless telephone via a digital wireless signaling channel, instructs the selected dual-mode wireless telephone to register with an alternative wireless communications system (e.g., AMPS) when the dual-mode wireless telephone is in an idle state. Hence, the digital wireless system can selectively limit access to the CDMA system by dual-mode telephones using proactive rescan commands that avoid the necessity of hard handoff or call transfer procedures normally encountered when initiating a wireless telephone call on the digital wireless communications system.
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