System and methods for controlling access to digital wireless network in a dual mode wireless system
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United States of America Patent
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Jun 12, 2001
Grant Date -
N/A
app pub date -
Dec 21, 1998
filing date -
Dec 21, 1998
priority date (Note) -
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Abstract
A dual-mode wireless communication system, having a AMPS-based wireless system and a CDMA-based wireless communication system is configured for transmitting digital wireless telephone signals by selectively transmitting a sync channel into a selected propagation region at a power level that is undetectable by digital telephones located within the selected propagation region. The transmission of the sync channel signal at the undetectable power level causes the dual-mode digital telephone to search for the alternative AMPS-based analog system, limiting access by the dual-mode digital telephones. Hence, the dual-mode wireless communication system can limit access to the digital communication system, for example, to prevent the occurrence of hard handoff with an adjacent analog system, or to reduce usage in a congested sector.
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