Method and apparatus for PDCCH monitoring

1 . A method performed by a first type of user equipment (UE), comprising:

receiving a search space set configuration including one or more search space subsets, wherein each search space subset includes at least one aggregation level and a total number of candidates associated with each aggregation level, each search space subset is independently configured for a Physical Downlink Control Channel (PDCCH) monitoring occasion group including at least one PDCCH monitoring occasion, and the one or more search space subsets include an additional search space subset configured for at least two PDCCH monitoring occasion groups; and

determining a candidate set for each search space subset for PDCCH monitoring.

2 . The method of claim 1 , further comprising:

determining an additional search space subset based on the one or more search space subsets, wherein the additional search space subset is associated with a repetition level.

3 . The method of claim 2 , wherein each of the one or more search space subsets is associated with a repetition level determined by the repetition level of the additional search space subset.

4 . The method of claim 1 , wherein an aggregation level associated with the first type of UE is larger than an aggregation level associated with a second type of UE.

5 . An apparatus for wireless communication, comprising:

at least one memory;

at least one processor coupled with the at least one memory and configured to cause the apparatus to:

receive a search space set configuration including one or more search space subsets, wherein each search space subset includes at least one aggregation level and a total number of candidates associated with each aggregation level, and wherein each search space subset is independently configured for a Physical Downlink Control Channel (PDCCH) monitoring occasion group including at least one PDCCH monitoring occasion, and the one or more search space subsets include an additional search space subset configured for at least two PDCCH monitoring occasion groups; and

determine a candidate set for each search space subset for PDCCH monitoring.

6 . The apparatus of claim 5 , wherein the at least one processor is configured to cause the apparatus to:

determine an additional search space subset based on the one or more search space subsets, wherein the additional search space subset is associated with a repetition level.

7 . The apparatus of claim 6 , wherein each of the one or more search space subsets is associated with a repetition level determined by a repetition level of the additional search space subset.

8 . The apparatus of claim 6 , wherein the additional search space subset includes an aggregation level included in each of the one or more search space subsets.

9 . The apparatus of claim 8 , wherein a candidate set for the additional search space subset includes at least a candidate that is associated with an aggregation level, and a repetition level, and is a combination of at least two candidates for at least two PDCCH monitoring occasion groups, and wherein the at least two candidates are associated with a same aggregation level.

10 . The apparatus of claim 6 , wherein the additional search space subset includes an aggregation level that is a combination of different aggregation levels included in the one or more search space subsets.

11 . The apparatus of claim 10 , wherein the apparatus is a first type of user equipment (UE) and the combination of different aggregation levels includes a first aggregation level associated with a PDCCH monitoring occasion group dedicated for the first type of UE, and a second aggregation level associated with a PDCCH monitoring occasion group shared by the first type of UE and a second type of UE.

12 . The apparatus of claim 10 , wherein a candidate set for the additional search space subset includes at least a candidate which is a combination of at least two candidates for at least two PDCCH monitoring occasion groups, and wherein the at least two candidates are associated with a same aggregation level and have a same candidate sequence.

13 . The apparatus of claim 5 , wherein the apparatus is a first type of user equipment (UE) and an aggregation level associated with the first type of UE is larger than an aggregation level associated with a second type of UE.

14 . The apparatus of claim 5 , wherein the apparatus is a first type of user equipment (UE) and the PDCCH monitoring occasion group includes a first PDCCH monitoring occasion group shared by both the first type of UE and a second type of UE.

15 . The apparatus of claim 5 , wherein the apparatus is a first type of user equipment (UE) and the PDCCH monitoring occasion group includes a second PDCCH monitoring occasion group dedicated for the first type of UE.

16 . The apparatus of claim 5 , wherein the apparatus is a first type of user equipment (UE) and a search space subset for a PDCCH monitoring occasion group dedicated for the first type of UE is a subset of a search space subset for a PDCCH monitoring occasion group dedicated for a second type of UE.

17 . A base station for wireless communication, comprising:

at least one memory;

at least one processor coupled with the at least one memory and configured to cause the base station to:

transmit a search space set configuration including one or more search space subsets, wherein each search space subset includes at least one aggregation level and a total number of candidates associated with each aggregation level, and wherein each search space subset is independently configured for a Physical Downlink Control Channel (PDCCH) monitoring occasion group including at least one PDCCH monitoring occasion, and the one or more search space subsets include an additional search space subset configured for at least two PDCCH monitoring occasion groups; and

determine a candidate set for each search space subset for PDCCH monitoring.

18 . The base station of claim 17 , wherein a repetition level in the search space set is determined by a repetition level of a corresponding PDCCH monitoring group and an integer set.

19 . A method performed by a base station, the method comprising:

transmitting a search space set configuration including one or more search space subsets, wherein each search space subset includes at least one aggregation level and a total number of candidates associated with each aggregation level, and wherein each search space subset is independently configured for a Physical Downlink Control Channel (PDCCH) monitoring occasion group including at least one PDCCH monitoring occasion, and the one or more search space subsets include an additional search space subset configured for at least two PDCCH monitoring occasion groups; and

determining a candidate set for each search space subset for PDCCH monitoring.

20 . The method of claim 19 , further comprising:

determining an additional search space subset based on the one or more search space subsets, wherein the additional search space subset is associated with a repetition level.