Patent ID: 8805389

Claim:
A method of synchronizing a Quiet Period (QP) in a Cognitive Radio (CR) system, the method comprising: receiving, by a Base Station (BS), QP synchronization information on a channel N from at least one neighbor BS; decoding the QP synchronization information; determining whether the channel N is an in-band channel using the QP synchronization information; if the channel N is the in-band channel, determining whether the BS is currently synchronized based on another QP synchronization information on a channel M and the synchronized another QP synchronization information is broadcasted, or determining whether the QP synchronization information is received from a plurality of neighbor BSs; and if the BS is not currently synchronized based on another QP synchronization information on a channel M and the synchronized another QP synchronization information is not broadcasted, or the QP synchronization information is not received from a plurality of neighbor BSs, synchronizing a QP of the channel N, based on the QP synchronization information.