METHOD AND DEVICE IN NODES USED FOR WIRELESS COMMUNICATION

1 . A first node for wireless communications, comprising:

a first transceiver, receiving a first information block, the first information block being used to determine M1 control channel candidates, and any control channel candidate among the M1 control channel candidates occupying at least one CCE, M1 being a positive integer greater than 1; and

a first receiver, monitoring a first control channel candidate, the first control channel candidate being one of the M1 control channel candidates;

wherein a second control channel candidate is a control channel candidate that occupies the same CCE(s) as the first control channel candidate; the first control channel candidate and the second control channel candidate have identical scrambling, and a size of a format of DCI carried by the first control channel candidate is the same as a size of a format of DCI carried by the second control channel candidate; an index of the first control channel candidate and an index of the second control channel candidate are unequal; a linking status of the second control channel candidate is used to determine whether the second control channel candidate is counted for monitoring, where the linking status of the second control channel candidate comprises at least one of whether the second control channel candidate is linked with a control channel candidate, a control channel candidate linked with the second control channel candidate or a linking type of the second control channel candidate.

2 . The first node according to claim 1 , wherein when the second control channel candidate is linked with a control channel candidate other than the second control channel candidate, Quasi-Colocation (QCL) of a reference signal comprised in the second control channel candidate is different from QCL of a reference signal comprised in the control channel candidate linked with the second control channel candidate.

3 . The first node according to claim 1 , wherein an index of a control resource set (CORESET) applied by a search space set to which the first control channel candidate belongs and an index of a CORESET applied by a search space set to which the second control channel candidate belongs are the same; a value of a carrier indicator field comprised in DCI carried by the first control channel candidate is equal to a value of a carrier indicator field comprised in DCI carried by the second control channel candidate.

4 . The first node according to claim 1 , wherein a search space set to which the first control channel candidate belongs and a search space set to which the second control channel candidate belongs are different, where an index of the first control channel candidate is equal to an index of the search space set to which the first control channel candidate belongs, and an index of the second control channel candidate is equal to an index of the search space set to which the second control channel candidate belongs.

5 . The first node according to claim 1 , wherein the first transceiver transmits a second information block; wherein the second information block is used to indicate at least one of whether the first node supports two control channel candidates being mutually linked or a linking type supported by the first node for mutually linked control channel candidates.

6 . The first node according to claim 1 , wherein the first information block is used to determine that the second control channel candidate and a third control channel candidate are linked, and the first information block is used to determine a linking type between the second control channel candidate and the third control channel candidate, the third control channel candidate being a control channel candidate other than the second control channel candidate; there exists overlapping time-domain resources between time-domain resources indicated by DCI carried by the second control channel candidate and time-domain resources indicated by DCI carried by the third control channel candidate.

7 . The first node according to claim 1 , wherein each CCE occupied by the first control channel candidate and the second control channel candidate belongs to a target time window in time domain, and a total number of times of monitoring counted by the first node in the target time window is no greater than a first threshold, the first threshold being a positive integer greater than 1; a subcarrier spacing of subcarriers occupied by the first control channel candidate in frequency domain is used to determine the first threshold.

8 . A second node for wireless communications, comprising:

a second transceiver, transmitting a first information block, the first information block being used to indicate M1 control channel candidates, and any control channel candidate among the M1 control channel candidates occupying at least one CCE, M1 being a positive integer greater than 1; and

a first transmitter, determining a first control channel candidate, the first control channel candidate being one of the M1 control channel candidates;

wherein a second control channel candidate is a control channel candidate that occupies the same CCE(s) as the first control channel candidate; the first control channel candidate and the second control channel candidate have identical scrambling, and a size of a format of DCI carried by the first control channel candidate is the same as a size of a format of DCI carried by the second control channel candidate; an index of the first control channel candidate and an index of the second control channel candidate are unequal; a linking status of the second control channel candidate is used to determine whether the second control channel candidate is counted for monitoring, where the linking status of the second control channel candidate comprises at least one of whether the second control channel candidate is linked with a control channel candidate, a control channel candidate linked with the second control channel candidate or a linking type of the second control channel candidate.

9 . The second node according to claim 8 , wherein an index of a CORESET applied by a search space set to which the first control channel candidate belongs and an index of a CORESET applied by a search space set to which the second control channel candidate belongs are the same; a value of a carrier indicator field comprised in DCI carried by the first control channel candidate is equal to a value of a carrier indicator field comprised in DCI carried by the second control channel candidate.

10 . The second node according to claim 8 , wherein a search space set to which the first control channel candidate belongs and a search space set to which the second control channel candidate belongs are different, where an index of the first control channel candidate is equal to an index of the search space set to which the first control channel candidate belongs, and an index of the second control channel candidate is equal to an index of the search space set to which the second control channel candidate belongs.

11 . The second node according to claim 8 , wherein the second transceiver receives a second information block; wherein the second information block is used to indicate at least one of whether a transmitter transmitting the second information block supports two control channel candidates being mutually linked or a linking type supported by the transmitter transmitting the second information block for mutually linked control channel candidates.

12 . The second node according to claim 8 , wherein the first information block is used to determine that the second control channel candidate and a third control channel candidate are linked, and the first information block is used to determine a linking type between the second control channel candidate and the third control channel candidate, the third control channel candidate being a control channel candidate other than the second control channel candidate; there exists overlapping time-domain resources between time-domain resources indicated by DCI carried by the second control channel candidate and time-domain resources indicated by DCI carried by the third control channel candidate.

13 . The second node according to claim 8 , wherein each CCE occupied by the first control channel candidate and the second control channel candidate belongs to a target time window in time domain, and a total number of times of monitoring counted by a monitor for the first control channel candidate in the target time window is no greater than a first threshold, the first threshold being a positive integer greater than 1; a subcarrier spacing of subcarriers occupied by the first control channel candidate in frequency domain is used to determine the first threshold.

14 . A method in a first node for wireless communications, comprising:

receiving a first information block, the first information block being used to determine M1 control channel candidates, and any control channel candidate among the M1 control channel candidates occupying at least one CCE, M1 being a positive integer greater than 1; and

monitoring a first control channel candidate, the first control channel candidate being one of the M1 control channel candidates;

wherein a second control channel candidate is a control channel candidate that occupies the same CCE(s) as the first control channel candidate; the first control channel candidate and the second control channel candidate have identical scrambling, and a size of a format of DCI carried by the first control channel candidate is the same as a size of a format of DCI carried by the second control channel candidate; an index of the first control channel candidate and an index of the second control channel candidate are unequal; a linking status of the second control channel candidate is used to determine whether the second control channel candidate is counted for monitoring, where the linking status of the second control channel candidate comprises at least one of whether the second control channel candidate is linked with a control channel candidate, a control channel candidate linked with the second control channel candidate or a linking type of the second control channel candidate.

15 . The method in the first node according to claim 14 , wherein when the second control channel candidate is linked with a control channel candidate other than the second control channel candidate, QCL of a reference signal comprised in the second control channel candidate is different from QCL of a reference signal comprised in the control channel candidate linked with the second control channel candidate.

16 . The method in the first node according to claim 14 , wherein an index of a CORESET applied by a search space set to which the first control channel candidate belongs and an index of a CORESET applied by a search space set to which the second control channel candidate belongs are the same; a value of a carrier indicator field comprised in DCI carried by the first control channel candidate is equal to a value of a carrier indicator field comprised in DCI carried by the second control channel candidate.

17 . The method in the first node according to claim 14 , wherein a search space set to which the first control channel candidate belongs and a search space set to which the second control channel candidate belongs are different, where an index of the first control channel candidate is equal to an index of the search space set to which the first control channel candidate belongs, and an index of the second control channel candidate is equal to an index of the search space set to which the second control channel candidate belongs.

18 . The method in the first node according to claim 14 , comprising:

transmitting a second information block;

wherein the second information block is used to indicate at least one of whether the first node supports two control channel candidates being mutually linked or a linking type supported by the first node for mutually linked control channel candidates.

19 . The method in the first node according to claim 14 , wherein the first information block is used to determine that the second control channel candidate and a third control channel candidate are linked, and the first information block is used to determine a linking type between the second control channel candidate and the third control channel candidate, the third control channel candidate being a control channel candidate other than the second control channel candidate; there exists overlapping time-domain resources between time-domain resources indicated by DCI carried by the second control channel candidate and time-domain resources indicated by DCI carried by the third control channel candidate.

20 . The method in the first node according to claim 14 , wherein each CCE occupied by the first control channel candidate and the second control channel candidate belong to a target time window in time domain, and a total number of times of monitoring counted by the first node in the target time window is no greater than a first threshold, the first threshold being a positive integer greater than 1; a subcarrier spacing of subcarriers occupied by the first control channel candidate in frequency domain is used to determine the first threshold.