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A method of monitoring a physical downlink control channel (PDCCH) in a wireless communication system is provided. A user equipment monitors a set of PDCCH candidates for a search space in a subframe. The search space includes a common search space monitored by all user equipments in a cell and a UE

A method of monitoring a physical downlink control channel (PDCCH) in a wireless communication system is provided. A user equipment monitors a set of PDCCH candidates for a search space in a subframe. The search space includes a common search space monitored by all user equipments in a cell and a UE-specific search space monitored by at least one UE in the cell.

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1. A method of monitoring a physical downlink control channel (PDCCH) in a wireless communication system, the method comprising: monitoring a set of PDCCH candidates for a search space in a subframe that comprises a slot that comprises a plurality of orthogonal frequency division multiplexing (OFDM)

1. A method of monitoring a physical downlink control channel (PDCCH) in a wireless communication system, the method comprising: monitoring a set of PDCCH candidates for a search space in a subframe that comprises a slot that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and a plurality of subcarriers in a frequency domain,wherein:the subframe further comprises a control region for transmitting control information, the control region comprising a set of control channel elements (CCEs);the search space comprises a contiguous set of CCEs classified into a common search space and a UE-specific search space;the common search space is monitored by all user equipments (UEs) in a cell and the UE-specific search space is monitored by at least one UE in the cell;locations for the PDCCH candidates for the search space are determined based on a CCE aggregation level; anda number of CCE aggregation levels for the common search space is smaller than a number of CCE aggregation levels for the UE-specific search space. 2. The method of claim 1, wherein a portion of the plurality of OFDM symbols and subcarriers in the slot makes up a resource block, the resource block comprising resource elements in the portion. 3. The method of claim 1, wherein a size of the search space is defined by the size of the CCE aggregation level and a number of the PDCCH candidates for the search space. 4. The method of claim 1, wherein the starting location of the common search space is fixed. 5. The method of claim 1, wherein the starting location of the common search space is set to zero. 6. The method of claim 1, wherein a starting location to search common control information is restricted in the common search space. 7. The method of claim 6, wherein a starting location to search first common control information and a starting location to search second common control information are restricted in the common search space. 8. The method of claim 7, wherein the starting location to search the first common control information is different from the starting location to search the second common control information. 9. The method of claim 1, wherein the common search space and the UE-specific search space overlap with each other. 10. A user equipment for monitoring a physical downlink control channel (PDCCH), the user equipment comprising: a radio frequency (RF) unit for receiving a radio signal; anda processor coupled with the RF unit and configured to: monitor a common search space at each of common control channel element (CCE) aggregation levels in a subframe that comprises a slot that comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein the subframe further comprises a control region for transmitting control information, the control region comprising a set of CCEs, and the common search space comprising a contiguous set of CCEs is monitored by all user equipments (UEs) in a cell; andmonitor a UE-specific search space at each of UE-specific CCE aggregation levels in the subframe, wherein the UE-specific search space is monitored by at least one UE in the cell,wherein locations for PDCCH candidates for a search space are determined based on a CCE aggregation level,wherein a number of aggregation levels for the common space is smaller than a number of CCE aggregation levels for the UE-specific search space. 11. The user equipment of claim 10, wherein the starting location of the common search space is fixed. 12. The user equipment of claim 10, wherein the starting location of the common search space is set to zero. 13. The user equipment of claim 10, wherein locations for the PDCCH candidates for the search space occur every K CCEs, where K is a size of a CCE aggregation level. 14. The user equipment of claim 10, wherein a size of the search space is defined by the size of the CCE aggregation level and a number of the PDCCH candidates for the search space. 15. The user equipment of claim 10, wherein the common search space and the UE-specific search space overlap with each other. 16. The method of claim 1, wherein a starting location of the common search space is the same for all the UEs in the cell, and a starting location of the UE-specific search space is determined in every subframe. 17. The user equipment of claim 10, wherein a starting location of the common search space is the same for all the UEs in the cell, and a starting location of the UE-specific search space is determined in every subframe.