Patent ID: 7907576
Filing Date: 2011-03-15
Classification: H04W

Abstract:
1. A method of determining an available frequency sub band for radio traffic in a multiple node radio network, the method comprising: providing for communication over a radio frequency band, the radio frequency band comprising radio frequency sub bands; providing a radio node group of at least one radio transmitter device configured to broadcast and at least one radio receiver device configured to receive on the radio frequency band; defining a time for a window of radio broadcast silence on one of the radio frequency sub bands and neighboring frequency sub-bands by the radio node group; surveying the at least one of the radio frequency sub bands during the window of radio broadcast silence to detect traffic on the radio frequency sub band; receiving a message from at least one other radio transmitter device in the radio group node, the message indicating that a sub band should not be used, the message being provided in response to surveying by the at least one other radio transmitter device during the window of radio broadcast silence; and choosing, based on the survey, a radio frequency sub band for broadcast in the radio frequency band.