Abstract: The cognitive radio cell acquires a scheme dividing frequency band resources into a number of sub-bands and corresponding silent period time frequency pattern, when performing silence on the sub-band which the cognitive radio cell works on according to the silence period time position of each sub-band defined in the silent period time frequency pattern, spectrum sensing on corresponding sub-band is implemented by radio spectrum sensing system or cognitive radio cell.

Abstract: Various examples of the present disclosure describe a method for configuring a quiet period in a CR system and a device thereof. The method includes: determining, by a base station, a maximum value of a quiet period parameter of a CR system based on maximum duration of interference which a radio authorization system tolerates and maximum loss of capacity which the CR system tolerates; determining a sensing algorithm based on a detecting performance requirement and the maximum value of the quiet period parameter; determining a value of the quiet period parameter based on the sensing algorithm; and sending the quiet period parameter to a terminal of the CR system. When the examples of the present disclosure are employed, the rationality of the configuration of the quiet period parameter of the CR system is improved and the capacity loss of the CR system is reduced when the interference to the authorization system is reduced.

Abstract: Various examples of the present disclosure describe a random access method and device in a CR system. The method includes: generating, by a base station device, a spectrum handover command, wherein the spectrum handover command comprises random access backoff time parameter information; and sending, by the base station device, the spectrum handover command to a user equipment in a cell to instruct the UE to initiate, during a spectrum handover procedure, a random access procedure using the random access backoff time parameter information. According to the various examples of the present disclosure, the random access backoff time parameter information is carried in the spectrum handover command, so that a random access conflict is suppressed during the spectrum handover procedure of the CR system. A large number of UEs that intensively perform random access on a target working frequency are pre-dispersed in time.

Abstract: Various examples provide a method and a system for spectrum handover in cognitive radio (CR) systems. According to the method, after detecting a user of an authorized system appears at a current working frequency, the base station generates a spectrum handover command and sends the spectrum handover command via a channel identified by the CR DWNDI to instruct the UEs in the cell to perform spectrum handover according to the spectrum handover command.

Abstract: The present disclosure provides a method and an apparatus for obtaining an idle spectrum. The method includes: obtaining, by a central management unit, configuration information of a transmitter of an authorized system, and obtaining geographic location information of candidate sense nodes; selecting, by the central management unit, sense nodes from the candidate sense nodes according to the configuration information and the geographic location information, and informing the selected sense nodes to perform spectrum sensing; and receiving, by the central management unit, sensing results of the selected sense nodes, and obtaining information of an idle spectrum according to the sensing results.

Abstract: The embodiments of the present application relate to the technical field of wireless communications, and in particular to a method, system and device for triggering and performing spectrum sensing, used for solving the problem in the prior art that if the sensing period is set too long, a decline of service quality between an authorization system and a cognitive system or even a network paralysis will be caused due to interference; and if the sensing period is set too short, an increase in power consumption of devices and a waste of spectrum resources will be caused. The method for performing spectrum sensing in the embodiments of the present application includes: a sensing node judging whether or not the channel quality has declined to the requirement for performing in-band spectrum sensing; and after determining that the channel quality has declined to the requirement for performing in-band spectrum sensing, the sensing node performing in-band spectrum sensing.

Abstract: The present application relates to of the communication field and discloses a method, device and system for implementing frequency point shift based on CR. The method comprises: determining, by a cognitive base station, a candidate working frequency point for UE deployed in a cognitive frequency band; then sending to the UE broadcast information which at least carries the candidate working frequency point and instructing the UE to shift from the working frequency point currently used thereby to the candidate working frequency point by way of a frequency point shift command. In this way, the UE deployed in the cognitive frequency band can achieve frequency point shift quickly and accurately according to the instruction from the cognitive base station when an authorized user accesses the working frequency point currently used by the UE, effectively avoiding interference to the authorized user and thereby ensuring the service performance and service continuity of the system.