Patent ID: 9584271
Date: 2017-02-28
CPC Classifications: H04L,H04W

Claim:
1. A method for spectrum sensing in a cognitive radio system, wherein the method comprises the operations of: dividing, by a cognitive radio spectrum sensing system, frequency band resources into a plurality of sub-bands and notifying respective cognitive radio cells of the division into the sub-bands and a corresponding time-frequency pattern of silence periods; and when the cognitive radio spectrum sensing system has the respective cognitive radio cells silent in sub-bands, where the cognitive radio cells operate, according to silence period temporal locations of respective sub-bands defined in the time-frequency pattern of silence periods, performing, by the cognitive radio spectrum sensing system, spectrum sensing on the respective sub-bands; wherein the time-frequency pattern of silence periods comprises: a statically configured time-frequency pattern of silence periods; or a dynamically configured time-frequency pattern of silence periods; or a time-frequency pattern of silence periods configured in hybrid; wherein the time-frequency pattern of silence periods defines silence period temporal locations of the respective sub-bands in at least one sensing periodicity; and the silence period temporal locations of the respective sub-bands do not overlap with each other; wherein when the time-frequency pattern of silence periods is a statically configured time-frequency pattern of silence periods, the cognitive radio spectrum sensing system having the respective cognitive radio cells silent in the sub-bands, where the cognitive radio cells operate, according to the silence period temporal locations of the respective sub-bands defined in the time-frequency pattern of silence periods comprises: when the cognitive radio spectrum sensing system determines from the time-frequency pattern of silence periods that a current instance of time is a silence period temporal location corresponding to a sub-band or sub-bands where one or more cognitive radio cells operate, the cognitive radio spectrum sensing system having the cognitive radio cell or cells silent in an interval of time corresponding to the silence period temporal location in the sub-band or sub-bands where the cognitive radio cell or cells operate; or when the time-frequency pattern of silence periods is a dynamically configured time-frequency pattern of silence periods, the cognitive radio spectrum sensing system having the respective cognitive radio cells silent in the sub-bands, where the cognitive radio cells operate, according to the silence period temporal locations of the respective sub-bands defined in the time-frequency pattern of silence periods comprises: when the cognitive radio spectrum sensing system transmits to a cognitive radio cell a request for spectrum sensing on a sub-band where the cognitive radio cell operates, the cognitive radio spectrum sensing system determining from the time-frequency pattern of silence periods one or more silence period temporal locations corresponding to the sub-band after a current instance of time; and the cognitive radio spectrum sensing system having the cognitive radio cell silent in an interval or intervals of time corresponding to the one or more silence period temporal locations in the sub-band where the cognitive radio cell operates; and wherein when the cognitive radio spectrum sensing system determines from the time-frequency pattern of silence periods that the current instance of time is a silence period temporal location corresponding to a sub-band where a cognitive radio cell operates, if the cognitive radio spectrum sensing system has not previously transmitted a request for spectrum sensing on the sub-band to the cognitive radio cell, then the cognitive radio spectrum sensing system gives up having the cognitive radio cell silent in an interval of time corresponding to the silence period temporal location in the sub-band where the cognitive radio cell operates but having the cognitive radio cell continue with normal operation in the sub-band; or when the time-frequency pattern of silence periods is a time-frequency pattern of silence periods configured in hybrid, the cognitive radio spectrum sensing system having the respective cognitive radio cells silent in the sub-bands, where the cognitive radio cells operate, according to the silence period temporal locations of the respective sub-bands defined in the time-frequency pattern of silence periods comprises: the cognitive radio spectrum sensing system identifying a dynamic sensing periodicity configured in the hybrid configuration scheme; when the cognitive radio spectrum sensing system determines from the time-frequency pattern of silence periods that a current instance of time is a silence period temporal location outside of the dynamic sensing periodicity corresponding to a sub-band where a cognitive radio cell operates, the cognitive radio spectrum sensing system having the cognitive radio cell silent in an interval of time corresponding to the silence period temporal location in the sub-band where the cognitive radio cell operates; when the cognitive radio spectrum sensing system transmits to a cognitive radio cell a request for spectrum sensing on a sub-band where the cognitive radio cell operates, the cognitive radio spectrum sensing system determining from the time-frequency pattern of silence periods one or more silence period temporal locations in the dynamic sensing periodicity corresponding to the sub-band after a current instance of time, and the cognitive radio spectrum sensing system having the cognitive radio cell silent in an interval or intervals of time corresponding to the one or more silence period temporal locations in the sub-band where the cognitive radio cell operates; and when the cognitive radio spectrum sensing system determines from the time-frequency pattern of silence periods that the current instance of time is a silence period temporal location in the dynamic sensing periodicity corresponding to a sub-band or sub-bands where one or more cognitive radio cells operate, if the cognitive radio spectrum sensing system has not previously transmitted a request for spectrum sensing on the sub-band or sub-bands to the cognitive radio cell or cells, then the cognitive radio spectrum sensing system giving up having the cognitive radio cell or cells silent in an interval of time corresponding to the silence period temporal location in the sub-band or sub-bands where the cognitive radio cell or cells operate but having the cognitive radio cell or cells continue with normal operation in the sub-band or sub-bands.