Method and apparatus for allowing communication units to...

Details Method and apparatus for allowing communication units to... Method and apparatus for allowing communication units to...

2007-07-03

2007-07-03

Le, Danh (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S433000, C370S329000, C455S450000, C455S509000, C348S725000, C375S346000

Reexamination Certificate

active

10973530

ABSTRACT:
The presence of the non-television transmission within a channel is used to indicate that secondary non-licensed usage of the channel is permitted. Specifically, if secondary users incorporate the means to identify the unique modulation signature of the secondary user, decoding of a beacon signal may not be necessary. With the above in mind, a radio will be prevented from transmitting within a frequency band when no transmission within the licensed spectrum is currently taking place; the licensee is currently transmitting on the spectrum (e.g., television transmissions are taking place utilizing the spectrum, or the radio cannot sense the presence of a data channel (beacon).

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