A method for a user device in a wireless communication system, comprising: receiving a configuration of a control resource set and a configuration of a search space corresponding thereto, wherein the control resource set is in a control region including time and frequency resources, and the receiving a configuration of a control resource set and a configuration of a search space corresponding thereto includes: receiving an indication of a starting symbol of the search space in the control resource set, receiving an indication of a number of symbols of the control resource set, receiving an indication of physical resource blocks, PRBs, in the control resource set, or receiving an indication of control channel element, CCE, to resource element group, REG, mapping; and detecting a control channel on the control resource set in accordance with the configuration of the control resource set, wherein the configuration of the control resource set includes an indication of PRB bundling, the indication of PRB bundling includes a size of a PRB bundle, the size of the PRB bundle is 6; wherein the control resource set is a first control resource set, and the search space is a first search space, the first control resource set and a second control resource set are overlapped, a CCE to REG mapping of the first control resource set is a first mapping mode, a CCE to REG mapping of the second control resource is a second mapping mode; when the first mapping mode is time first, the second mapping mode is frequency first; and when the first mapping mode is frequency first, the second mapping mode is time first. receiving a configuration of a control resource set and a configuration of a search space corresponding thereto, wherein the control resource set is in a control region including time and frequency resources, and the receiving a configuration of a control resource set and a configuration of a search space corresponding thereto includes: receiving an indication of a starting symbol of the search space in the control resource set, receiving an indication of a number of symbols of the control resource set, receiving an indication of physical resource blocks, PRBs, in the control resource set, or receiving an indication of control channel element, CCE, to resource element group, REG, mapping; and receiving an indication of a starting symbol of the search space in the control resource set, receiving an indication of a number of symbols of the control resource set, receiving an indication of physical resource blocks, PRBs, in the control resource set, or receiving an indication of control channel element, CCE, to resource element group, REG, mapping; and detecting a control channel on the control resource set in accordance with the configuration of the control resource set, wherein the configuration of the control resource set includes an indication of PRB bundling, the indication of PRB bundling includes a size of a PRB bundle, the size of the PRB bundle is 6; wherein the control resource set is a first control resource set, and the search space is a first search space, the first control resource set and a second control resource set are overlapped, a CCE to REG mapping of the first control resource set is a first mapping mode, a CCE to REG mapping of the second control resource is a second mapping mode; when the first mapping mode is time first, the second mapping mode is frequency first; and when the first mapping mode is frequency first, the second mapping mode is time first. <EOS>