Determining the search space, the method and apparatus of the candidate control channel resources

The present invention provides methods of determining the search space, the method and apparatus of the candidate control channel resources, wherein the method of determining the search space comprises: determining for each UE currently required to monitor downlink control channel information bits; UE bearer data channel according to the currently used mapping relationship between the carrier and the carrier unit carrying a control channel, determines that the UE needs to monitor the control channel corresponding to each of the temporary search space; UE currently required to be monitored for the same CCE aggregation level control channel, when one or more other control all or part of the number of control information bits of the downlink control channel to the control channel and the downlink control information bits selected is the same, determining the selected type of control of the actual search space corresponding to the downlink control information bits of the same number CCE and all or a portion of the channel corresponding to the temporary search space. Using this protocol, in a carrier aggregation system can reduce the probability of collision PDCCH scheduling.