Method and apparatus for transmitting and receiving downlink control channel in communication system

1. An operation method of a terminal in a communication system, the operation method comprising:

receiving configuration information of one or more resource sets for a physical downlink control channel (PDCCH) monitoring operation from a base station;

performing the PDCCH monitoring operation in the one or more resource sets;

receiving at least one downlink control information (DCI) including scheduling information of a first physical downlink shared channel (PDSCH) by the PDCCH monitoring operation; and

receiving the first PDSCH based on the scheduling information,

wherein the one or more resource sets include a first search space and a second search space for PDCCH repeated transmissions, the first search space is used for transmission of a first DCI, and the second search space is used for transmission of a second DCI, the at least one DCI is at least one of the first DCI and the second DCI, the first DCI and the second DCI include same payload, a format of the first DCI is identical to a format of the second DCI, and the same payload is repeatedly transmitted in the first search space and the second search space,

when the first DCI and the second DCI do not include TCI state information for the first PDSCH, a reception operation of the first PDSCH is performed based on an assumption that the first PDSCH has QCL relation with a CORESET having a lower identifier among a first CORESET associated with the first search space and a second CORESET associated with the second search space.

2. The operation method according to claim 1 , wherein the first DCI is received based on information on a quasi-co-location (QCL) of a first control resource set (CORESET) associated with the first search space, the second DCI is received based on information on a QCL of a second CORESET associated with the second search space, and the information on the QCL of the first CORESET and the information on the QCL of the second CORESET are determined independently of each other.

3. The operation method according to claim 1 , wherein, when a first CORESET associated with the first search space is identical to a second CORESET associated with the second search space, the first DCI and the second DCI are received based on information on same QCL.

4. The operation method according to claim 1 , wherein the first PDSCH is received based on transmission configuration information (TCI) state information for the first PDSCH, configuration information of a first CORESET associated with the first search space includes first information indicating whether the TCI state information is included in the first DCI, configuration information of a second CORESET associated with the second search space includes second information indicating whether the TCI state information is included in the second DCI, and the first information is identical to the second information.

5. The method according to claim 1 , wherein the first search space and the second search space are configured as same search space set type, and the same search space set type is a terminal specific search space or a common search space.

6. The operation method according to claim 1 , wherein a first PDCCH including the first DCI is transmitted through a first PDCCH candidate of the first search space, a second PDCCH including the second DCI is transmitted through a second PDCCH candidate of the second search space, and the first PDCCH candidate and the second PDCCH candidate have same control channel element (CCE) aggregation level and same PDCCH candidate index.

7. The operation method according to claim 6 , wherein the first PDCCH candidate is configured to be connected to the second PDCCH candidate for the PDCCH repeated transmissions.

8. The operation method according to claim 6 , wherein the performing the PDCCH monitoring operation includes, when the first PDCCH candidate satisfies a predefined condition, performing a monitoring operation of the second PDCCH candidate without performing a monitoring operation of the first PDCCH candidate.

9. The operation method of claim 8 , wherein the predefined condition includes at least one of a condition in which the first PDCCH candidate overlaps with a synchronization signal/physical broadcast channel (SS/PBCH) block, a condition in which the first PDCCH candidate overlaps with a physical random access channel (PRACH) resource, a condition in which the first PDCCH candidate overlaps an uplink symbol, and a condition in which the first search space is excluded from mapping by a search space mapping rule.

10. An operation method of a base station in a communication system, the operation method comprising:

transmitting configuration information of one or more resource sets for a physical downlink control channel (PDCCH) monitoring operation to a terminal;

transmitting at least one downlink control information (DCI) including scheduling information of a first physical downlink shared channel (PDSCH) in the one or more resource sets to the terminal; and

transmitting the first PDSCH to the terminal based on the scheduling information,

wherein the one or more resource sets include a first search space and a second search space for PDCCH repeated transmissions, the first search space is used for transmission of a first DCI, and the second search space is used for transmission of a second DCI, the at least one DCI is at least one of the first DCI and the second DCI, the first DCI and the second DCI include same payload, a format of the first DCI is identical to a format of the second DCI, and the same payload is repeatedly transmitted in the first search space and the second search space,

when the first DCI and the second DCI do not include TCI state information for the first PDSCH, a reception operation of the first PDSCH in the terminal is performed based on an assumption that the first PDSCH has QCL relation with a CORESET having a lower identifier among a first CORESET associated with the first search space and a second CORESET associated with the second search space.

11. The operation method according to claim 10 , wherein information on a quasi-co-location (QCL) of a first control resource set (CORESET) associated with the first search space is determined independently from information on a QCL of a second CORESET associated with the second search space.

12. The operation method according to claim 10 , wherein configuration information of a first CORESET associated with the first search space includes first information indicating whether transmission configuration information (TCI) state information is included in the first DCI, configuration information of a second CORESET associated with the second search space includes second information indicating whether the TCI state information is included in the second DCI, and the first information is identical to the second information.

13. The method according to claim 10 , wherein the first search space and the second search space are configured as same search space set type, and the same search space set type is a terminal specific search space or a common search space.

14. The operation method according to claim 10 , wherein a first PDCCH including the first DCI is transmitted through a first PDCCH candidate of the first search space, a second PDCCH including the second DCI is transmitted through a second PDCCH candidate of the second search space, and the first PDCCH candidate and the second PDCCH candidate have same control channel element (CCE) aggregation level and same PDCCH candidate index.

15. The operation method according to claim 14 , wherein the first PDCCH candidate is configured to be connected to the second PDCCH candidate for the PDCCH repeated transmissions.