Method and apparatus for transmitting/receiving HARQ-ACK feedback for network cooperative communication
The disclosure relates to a communication technique that converges a 5th generation (5G) communication system for supporting a higher data rate after a 4th generation (4G) system with Internet of things (IoT) technology, and a system thereof. The disclosure can be applied to intelligent services (e.g., smart home, smart building, smart city, smart or connected car, healthcare, digital education, retail, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. The disclosure relates to a wireless communication system and, more particularly, to a method and an apparatus wherein a User Equipment (UE) transmits Hybrid Automatic Repeat request Acknowledgement (HARQ-ACK) information to multiple transmission points, panels, or beams through an uplink for cooperative communication between multiple transmission points, panels, or beams.
1. A method performed by a terminal in a communication system, the method comprising:
receiving, from a base station via higher layer signaling, information on a physical downlink control channel (PDCCH) repetition comprising a first aggregation level;
receiving, from the base station, a PDCCH based on a first PDCCH candidate associated with a first search space set and a second PDCCH candidate associated with a second search space set;
based on the first aggregation level, identifying that the first PDCCH candidate and the second PDCCH candidate are linked with a downlink control information (DCI) format with the same information;
receiving, from the base station a physical downlink shared channel (PDSCH) based on the PDCCH;
identifying a physical uplink control channel (PUCCH) resource from a PUCCH resource set based on a control resource set (CORESET) associated with a search space set having a lowest index between the first search space set and the second search space set; and
transmitting, to the base station, hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the PDSCH based on the PUCCH resource,
wherein, in case that a second aggregation level of the first PDCCH candidate and a third aggregation level of the second PDCCH candidate are the same as the first aggregation level, the first PDCCH candidate and the second PDCCH candidate are linked with the DCI format with the same information, and
wherein the first search space set and the second search space set are linked with the DCI format with the same information, based on the first aggregation level.
2. The method of claim 1 , wherein the PUCCH resource is identified based on a number of control channel elements (CCEs) in the CORESET associated with the search space set having the lowest index.
3. The method of claim 1 , wherein the PUCCH resource is identified based on a starting control channel element (CCE) index for a PDCCH candidate associated with the search space set having the lowest index.
4. The method of claim 1 , wherein the PUCCH resource is identified from a set of PUCCH resources including more than eight PUCCH resources.
5. The method of claim 1 , wherein a first CORESET associated with the first search space set and a second CORESET associated with the second search space set are received using two different transmission configuration indicator (TCI) states.
6. A method performed by a base station in a communication system, the method comprising:
transmitting, to a terminal via higher layer signaling, information on a physical downlink control channel (PDCCH) repetition comprising a first aggregation level;
transmitting, to the terminal, a PDCCH based on a first PDCCH candidate associated with a first search space set and a second PDCCH candidate associated with a second search space set;
transmitting, to the terminal, a physical downlink shared channel (PDSCH) based on the PDCCH; and
receiving, from the terminal, hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the PDSCH based on a physical uplink control channel (PUCCH) resource identified from a PUCCH resource set based on a control resource set (CORESET) associated with a search space set having a lowest index between the first search space set and the second search space set,
wherein the first PDCCH candidate and the second PDCCH candidate are associated with a downlink control information (DCI) format with the same information, based on the first aggregation level,
wherein a second aggregation level of the first PDCCH candidate and a third aggregation level of the second PDCCH candidate are the same as the first aggregation level, and
wherein the first search space set and the second search space set are linked with the DCI format with the same information, based on the first aggregation level.
7. The method of claim 6 , wherein the PUCCH resource is identified based on a number of control channel elements (CCEs) in the CORESET associated with the search space set having the lowest index.
8. The method of claim 6 , wherein the PUCCH resource is identified based on a starting control channel element (CCE) index for a PDCCH candidate associated with the search space set having the lowest index.
9. The method of claim 6 , wherein the PUCCH resource is identified from a set of PUCCH resources including more than eight PUCCH resources.
10. The method of claim 6 , wherein a first CORESET associated with the first search space set and a second CORESET associated with the second search space set are transmitted using two different transmission configuration indicator (TCI) states.
11. A terminal in a communication system, the terminal comprising:
a transceiver; and
a processor configured to:
receive, from a base station via higher layer signaling, information on a physical downlink control channel (PDCCH) repetition comprising a first aggregation level,
receive, from the base station, a PDCCH based on a first PDCCH candidate associated with a first search space set and a second PDCCH candidate associated with a second search space set,
based on the first aggregation level, identify that the first PDCCH candidate and the second PDCCH candidate are linked with a downlink control information (DCI) format with the same information,
receive, from the base station a physical downlink shared channel (PDSCH) based on the PDCCH,
identify a physical uplink control channel (PUCCH) resource from a PUCCH resource set based on a control resource set (CORESET) associated with a search space set having a lowest index between the first search space set and the second search space set,
transmit, to the base station, hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the PDSCH based on the PUCCH resource,
wherein, in case that a second aggregation level of the first PDCCH candidate and a third aggregation level of the second PDCCH candidate are the same as the first aggregation level, the first PDCCH candidate and the second PDCCH candidate are linked with the DCI format with the same information, and
wherein the first search space set and the second search space set are linked with the DCI format with the same information, based on the first aggregation level.
12. The terminal of claim 11 , wherein the PUCCH resource is identified based on a number of control channel elements (CCEs) in the CORESET associated with the search space set having the lowest index.
13. The terminal of claim 11 , wherein the PUCCH resource is identified based on a starting control channel element (CCE) index for a PDCCH candidate associated with the search space set having the lowest index.
14. The terminal of claim 11 , wherein the PUCCH resource is identified from a set of PUCCH resources including more than eight PUCCH resources.
15. The terminal of claim 11 , wherein a first CORESET associated with the first search space set and a second CORESET associated with the second search space set are received using two different transmission configuration indicator (TCI) states.
16. A base station in a communication system, the base station comprising:
a transceiver; and
a processor configured to:
transmit, to a terminal via higher layer signaling, information on a physical downlink control channel (PDCCH) repetition comprising a first aggregation level,
transmit, to the terminal, a PDCCH based on a first PDCCH candidate associated with a first search space set and a second PDCCH candidate associated with a second search space set,
transmit, to the terminal, a physical downlink shared channel (PDSCH) based on the PDCCH, and
receive, from the terminal, hybrid automatic repeat request acknowledgement (HARQ-ACK) information for the PDSCH based on a physical uplink control channel (PUCCH) resource identified from a PUCCH resource set based on a control resource set (CORESET) associated with a search space set having a lowest index between the first search space set and the second search space set,
wherein the first PDCCH candidate and the second PDCCH candidate are associated with a downlink control information (DCI) format with the same information, based on the first aggregation level,
wherein a second aggregation level of the first PDCCH candidate and a third aggregation level of the second PDCCH candidate are the same as the first aggregation level, and
wherein the first search space set and the second search space set are linked with the DCI format with the same information, based on the first aggregation level.
17. The base station of claim 16 , wherein the PUCCH resource is identified based on a number of control channel elements (CCEs) in the CORESET associated with the search space set having the lowest index.
18. The base station of claim 16 , wherein the PUCCH resource is identified based on a starting control channel element (CCE) index for a PDCCH candidate associated with the search space set having the lowest index.
19. The base station of claim 16 , wherein the PUCCH resource is identified from a set of PUCCH resources including more than eight PUCCH resources.
20. The base station of claim 16 , wherein a first CORESET associated with the first search space set and a second CORESET associated with the second search space set are transmitted using two different transmission configuration indicator (TCI) states.