Signalling method of detecting hidden incumbent system in...

Details Signalling method of detecting hidden incumbent system in... Signalling method of detecting hidden incumbent system in...

2007-02-21

2010-12-14

Ngo, Ricky (Department: 2464)

Multiplex communications

Communication over free space

Using trunking

C370S438000, C370S445000

Reexamination Certificate

active

07852821

ABSTRACT:
A signaling method between a cognitive radio (CR) base station and a CR terminal in a CR environment, and a channel division method used for the signaling method, includes: detecting a channel usage of an incumbent system, which communicates with a CR base station; sensing an outband channel to communicate with the CR base station; receiving an EOS, which is broadcasted from the CR base station via the outband channel according to a predetermined period; and transmitting a sensing report signal with respect to the channel to the CR base station.

REFERENCES:
patent: 5661727 (1997-08-01), Kermani et al.
patent: 7376425 (2008-05-01), Laroia et al.
patent: 2004/0029590 (2004-02-01), Wentink
patent: 2006/0030318 (2006-02-01), Moore et al.
patent: 2008/0259811 (2008-10-01), Cordeiro et al.
PCT International Search Report and Written Opinion issued in corresponding PCT International Application No. PCT/KR2007/002718 dated Sep. 11, 2007.

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