Method for detecting downlink control channel, user equipment, and base station

1. A method for detecting a Physical Downlink Control Channel (PDCCH), comprising:

a User Equipment (UE) detecting a downlink control channel of the UE in a first search space and a second search space, wherein the first search space and the second search space are resources for a base station to send downlink control channel information;

wherein both of the first search space and the second search space are UE-specific search spaces, and the first search space is distributed at a subframe or a time slot or a time-frequency location; and the second search space is distributed at another subframe or another time slot or another time-frequency location, wherein a time frequency at which the first search space is located and a time frequency at which the second search space is located can overlap;

wherein the step of the UE detects the downlink control channel in the first search space and/or the second search space comprises:

the UE using a configuration of {a, b, c, d} as the number of PDCCH candidates to detect PDCCH, wherein a, b, c and d are all positive integers and a+b+c+d is less than or equals 8; or

the UE using a configuration of {e, f} as aggregation level to detect the PDCCH, where e and f are both positive integers, and the values of e and f belong to a set {1, 2, 4, 8}.

2. The method according to claim 1 , wherein the UE detects an uplink grant (UL grant) of the downlink control channel in the first search space, and the UE detects a downlink grant (DL grant) of the downlink control channel in the second search space; or the UE detects the uplink grant and the downlink grant in both the first search space and the second search space.

3. The method according to claim 1 , wherein a downlink control information format configured in the first search space is not the same as a downlink control information format configured in the second search space.

4. The method according to claim 3 , wherein the step of the UE detects the downlink control channel of the UE in the first search space and the second search space comprises:

the UE detecting the DL grant and the UL grant which is carried by downlink control information format (DCI format) 0 in the first search space and detecting all the UL grants except for the UL grant carried by the DCI format 0 in the second search space; or

the UE detecting the UL grant and the DL grant which is carried by the DCI format 1A in the second search space and detecting all the DL grants except for the DL grant carried by the DCI format 1A in the first search space; or

the UE detecting the DCI format 1A and DCI format 0 in a common search space, detecting other DL Grants except for the DCI format 1A in the first search space, and detecting other UL Grants except for the DCI format 0 in the second search space, wherein the common search space is a search space required to be detected by all the UEs.

5. The method according to claim 1 , wherein before the UE detects the downlink control channel of the UE in the first search space and the second search space, the method further comprises:

the base station sending downlink control channel information to the UE in the first search space and/or the second search space.

6. The method according to claim 5 , wherein before the base station sends downlink control channel information to the UE in the first search space and/or the second search space, the method further comprises:

the base station merging downlink control information formats which carry the downlink control channel information.

7. The method according to claim 1 , wherein the step of the UE detects the downlink control channel in the first search space and/or the second search space comprises:

the UE using a configuration of {a, b, c, d} as the number of PDCCH candidates to detect PDCCH, wherein a, b, c and d are all positive integers and a+b+c+d is less than or equals 8.

8. The method according to claim 1 , wherein the UE uses a configuration of {3, 3, 1, 1} as the number of PDCCH candidates to detect the PDCCH.

9. The method according to claim 1 , wherein the UE detects the downlink control channel in the first search space and/or the second search space, comprises:

the UE using a configuration of {a, b, c, d} as the number of PDCCH candidates to detect the PDCCH in the first search space or the second search space, and using a configuration of {6, 6, 2, 2} as the number of PDCCH candidates to detect the PDCCH in another search space;

or the UE using a configuration of {a, b, c, d} as the number of PDCCH candidates to detect the PDCCH when detecting the DCI format 1A and the DCI format 0, and using a configuration of {6, 6, 2, 2} as the number of PDCCH candidates to detect the PDCCH when detecting other DCI formats except for the DCI format 1A and the DCI format 0;

or the UE using a configuration of {a, b, c, d} as the number of PDCCH candidates to detect the POOCH when detecting the DCI formats except for the DCI formats 0 and 1A, and using a configuration of {6, 6, 2, 2} as the number of PDCCH candidates to detect the PDCCH when detecting the DCI format 1A and the DCI format 0.

10. The method according to claim 1 , wherein the step of the UE detects the downlink control channel in the first search space and/or the second search space comprises:

the UE using a configuration of {e, f} as aggregation level to detect the PDCCH, where e and f are both positive integers, and the values of e and f belong to a set {1, 2, 4, 8}.

11. The method according to claim 1 , wherein the step of the UE detects the downlink control channel in the first search space and/or the second search space comprises:

the UE using a configuration of {e, f} as aggregation level to detect the PDCCH in the first search space or the second search space, and using a configuration of {1, 2, 4, 8} as aggregation level to detect the PDCCH in another search space;

or the UE using a configuration of {e, f} as aggregation level to detect the PDCCH when detecting the DCI format 1A and the DCI format 0, and using a configuration of {1, 2, 4, 8} as aggregation level to detect the PDCCH when detecting other DCI formats except for the DCI format 1A and the DCI format 0;

or the UE using a configuration of {e, f} as aggregation level to detect the PDCCH when detecting the DCI formats except for the DCI formats 0 and 1A, and using a configuration of {1, 2, 4, 8} as aggregation level to detect the PDCCH when detecting the DCI format 1A and the DCI format 0.

12. A User Equipment (UE), comprising:

a detection module, configured to detect the downlink control channel of the UE in a first search space and a second search space, wherein the first search space and the second search space are resources for a base station to send downlink control channel information; and

a hardware processor coupled with a memory, configured to execute the detection module;

wherein both of the first search space and the second search space are UE-specific search spaces, and the first search space is distributed at a subframe or a time slot or a time-frequency location; and the second search space is distributed at another subframe or another time slot or another time-frequency location, wherein a time frequency at which the first search space is located and a time frequency at which the second search space is located can overlap;

wherein the detection module comprises:

a first detection module, configured to use a configuration of {a, b, c, d} as the number of PDCCH candidates to detect the PDCCH, where a, b, c and d are all positive integers and a+b+c+d is less than or equals 8; or

a second detection module, configured to use a configuration of {e, f} as aggregation level to detect the PDCCH, where the values of e and f belong to a set {1, 2, 4, 8}.

13. The user equipment according to claim 12 , wherein the detection module comprises:

a first detection module, configured to use a configuration of {a, b, c, d} as the number of PDCCH candidates to detect the PDCCH, where a, b, c and d are all positive integers and a+b+c+d is less than or equals 8.

14. The user equipment according to claim 12 , wherein the detection module comprises:

a second detection module, configured to use a configuration of {e, f} as aggregation level to detect the PDCCH, where the values of e and f belong to a set {1, 2, 4, 8}.

15. A base station, comprising:

a sending module, configured to send downlink control channel information to a UE in a first search space and a second search space, wherein the first search space and the second search space are resources for a base station to send downlink control channel information; and

a hardware processor coupled with a memory, configured to execute the sending module;

wherein both of the first search space and the second search space are UE-specific search spaces, and the first search space is distributed at a subframe or a time slot or a time-frequency location; and the second search space is distributed at another subframe or another time slot or another time-frequency location, wherein a time frequency at which the first search space is located and a time frequency at which the second search space is located can overlap;

wherein the sending module comprises:

a first sending sub-module, configured to send a DL grant and a UL grant which is carried by downlink control information format (DCI format) 0 in the first search space and send all the UL grants except for the UL grant carried by the DCI format 0 in the second search space.

16. The base station according to claim 15 , wherein the sending module comprises:

a second sending sub-module, configured to send the UL grant and the DL grant which is carried by DCI format 1A in the second search space and send all the DL grants except for the DL grant carried by the DCI format 1A in the first search space.

17. The base station according to claim 15 , wherein the base station further comprises:

a merge module, configured to merge downlink control information formats which are used for carrying the downlink control information.