Method and apparatus for configuring default beam in wireless communication systems

1. A method performed by a terminal in a wireless communication system, the method comprising:

receiving, from a first cell of a base station, cross carrier scheduling configuration including information indicating that a carrier indicator field (CIF) is included in downlink control information (DCI);

receiving, from the first cell of the base station, the DCI for scheduling a physical downlink shared channel (PDSCH), the DCI including the CIF;

in case that the CIF indicates that a resource assignment of the PDSCH is for the first cell, identifying whether a first offset value between a reception of the DCI and the PDSCH is less than a threshold; and

in case that the first offset value is less than the threshold and the terminal supports default beam selection for the PDSCH, receiving, from the first cell of the base station, data on the PDSCH based on quasi co-located (QCL) parameters for a control resource set (CORESET) associated with a search space with a lowest CORESET identifier (ID) within an active bandwidth part (BWP) of the first cell in a latest slot monitored by the terminal.

2. The method of claim 1 , further comprising:

in case that the CIF indicates that the resource assignment of the PDSCH is for a second cell of the base station, identifying whether a second offset value between the reception of the DCI and the PDSCH is less than the threshold; and

in case that the second offset value is less than the threshold and the terminal supports the default beam selection for the PDSCH, receiving, from the second cell of the base station, data on the PDSCH based on information on a transmission configuration indication (TCI) state with a lowest TCI state ID among activated TCI states in an active BWP of the second cell.

3. The method of claim 2 , further comprising:

in case that the DCI does not include a TCI field, receiving, from the second cell of the base station, data on the PDSCH based on the information on the TCI state with the lowest TCI state ID among the activated TCI states in the active BWP of the second cell; and

in case that the DCI includes the TCI field indicating a TCI state #n, an interval between a symbol in which the transmission of a physical downlink control channel (PDCCH) ends and a start symbol of the PDSCH scheduled by the PDCCH is less than the threshold, and one or more TCI states in a TCI state list configured through radio resource control (RRC) for the PDSCH include a QCL type, receiving the data on the PDSCH,

wherein the data is received on the PDSCH based on QCL parameters according to a Release of the terminal.

4. The method of claim 1 , further comprising:

transmitting, to the base station, capability information of the terminal, the capability information including information indicating that the terminal supports the default beam selection for the PDSCH.

5. The method of claim 4 , wherein the capability information further includes information on the threshold.

6. A method performed by a base station in a wireless communication system, the method comprising:

transmitting, from a first cell of the base station to a terminal, cross carrier scheduling configuration including information indicating that a carrier indicator field (CIF) is included in downlink control information (DCI);

transmitting, from the first cell of the base station to the terminal, the DCI for scheduling a physical downlink shared channel (PDSCH), the DCI including the CIF; and

in case that the CIF indicates that a resource assignment of the PDSCH is for the first cell, transmitting, from the first cell of the base station to the terminal, first data on the PDSCH, wherein in case that a first offset value between a reception of the DCI and the PDSCH is less than a threshold and the terminal supports default beam selection for the PDSCH, the first data is received based on quasi co-located (QCL) parameters for a control resource set (CORESET) associated with a search space with a lowest CORESET identifier (ID) within an active bandwidth part (BWP) of the first cell in a latest slot monitored by the terminal.

7. The method of claim 6 , further comprising:

in case that the CIF indicates that the resource assignment of the PDSCH is for a second cell of the base station, transmitting, from the second cell of the base station to the terminal, second data on the PDSCH, wherein in case that a second offset value between the reception of the DCI and the PDSCH is less than the threshold and the terminal supports default beam selection for the PDSCH, the second data is received based on information on a transmission configuration indication (TCI) state with a lowest TCI state ID among activated TCI states in an active BWP of the second cell.

8. The method of claim 7 , wherein in case that the DCI does not include a TCI field, the second data is received based on the information on the TCI state with the lowest TCI state ID among the activated TCI states in the active BWP of the second cell,

wherein in case that the DCI includes the TCI field indicating a TCI state #n, an interval between a symbol in which the transmission of a physical downlink control channel (PDCCH) ends and a start symbol of the PDSCH scheduled by the PDCCH is less than the threshold, and one or more TCI states in a TCI state list configured through radio resource control (RRC) for the PDSCH include a QCL type, the second data is received on the PDSCH, and

wherein the second data is received on the PDSCH based on QCL parameters according to a Release of the terminal.

9. The method of claim 6 , further comprising:

receiving, from the terminal, capability information of the terminal, the capability information including information indicating that the terminal supports the default beam selection for the PDSCH.

10. The method of claim 9 , wherein the capability information further includes information on the threshold.

11. A terminal in a wireless communication system, the terminal comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

receive, from a first cell of a base station, cross carrier scheduling configuration including information indicating that a carrier indicator field (CIF) is included in downlink control information (DCI),

receive, from the first cell of the base station, the DCI for scheduling a physical downlink shared channel (PDSCH), the DCI including the CIF,

in case that the CIF indicates that a resource assignment of the PDSCH is for the first cell, identify whether a first offset value between a reception of the DCI and the PDSCH is less than a threshold, and

in case that the first offset value is less than the threshold and the terminal supports default beam selection for the PDSCH, receive, from the first cell of the base station, data on the PDSCH based on quasi co-located (QCL) parameters for a control resource set (CORESET) associated with a search space with a lowest CORESET identifier (ID) within an active bandwidth part (BWP) of the first cell in a latest slot monitored by the terminal.

12. The terminal of claim 11 , wherein the controller is further configured to:

in case that the CIF indicates that the resource assignment of the PDSCH is for a second cell of the base station, identify whether a second offset value between the reception of the DCI and the PDSCH is less than the threshold, and

in case that the second offset value is less than the threshold and the terminal supports the default beam selection for the PDSCH, receive, from the second cell of the base station, data on the PDSCH based on information on a transmission configuration indication (TCI) state with a lowest TCI state ID among activated TCI states in an active BWP of the second cell.

13. The terminal of claim 12 , wherein the controller is further configured to:

in case that the DCI does not include a TCI field, receive, from the second cell of the base station, data on the PDSCH based on the information on the TCI state with the lowest TCI state ID among the activated TCI states in the active BWP of the second cell, and

in case that the DCI includes the TCI field indicating a TCI state #n, an interval between a symbol in which the transmission of a physical downlink control channel (PDCCH) ends and a start symbol of the PDSCH scheduled by the PDCCH is less than the threshold, and one or more TCI states in a TCI state list configured through radio resource control (RRC) for the PDSCH include a QCL type, receive the data on the PDSCH,

wherein the data is received on the PDSCH based on QCL parameters according to a Release of the terminal.

14. The terminal of claim 11 , wherein the controller is further configured to:

transmit, to the base station, capability information of the terminal, the capability information including information indicating that the terminal supports the default beam selection for the PDSCH.

15. The terminal of claim 14 , wherein the capability information further includes information on the threshold.

16. A base station in a wireless communication system, the base station comprising:

a transceiver; and

a controller coupled with the transceiver and configured to:

transmit, from a first cell of the base station to a terminal, cross carrier scheduling configuration including information indicating that a carrier indicator field (CIF) is included in downlink control information (DCI),

transmit, from the first cell of the base station to the terminal, the DCI for scheduling a physical downlink shared channel (PDSCH), the DCI including the CIF, and

in case that the CIF indicates that a resource assignment of the PDSCH is for the first cell, transmit, from the first cell of the base station to the terminal, first data on the PDSCH,

wherein in case that a first offset value between a reception of the DCI and the PDSCH is less than a threshold and the terminal supports default beam selection for the PDSCH, the first data is received based on quasi co-located (QCL) parameters for a control resource set (CORESET) associated with a search space with a lowest CORESET identifier (ID) within an active bandwidth part (BWP) of the first cell in a latest slot monitored by the terminal.

17. The base station of claim 16 ,

wherein the controller is further configured to:

in case that the CIF indicates that the resource assignment of the PDSCH is for a second cell of the base station, transmit, from the second cell of the base station to the terminal, second data on the PDSCH, and

wherein in case that a second offset value between the reception of the DCI and the PDSCH is less than the threshold and the terminal supports default beam selection for the PDSCH, the second data is received based on information on a transmission configuration indication (TCI) state with a lowest TCI state ID among activated TCI states in an active BWP of the second cell.

18. The base station of claim 17 , wherein in case that the DCI does not include a TCI field, the second data is received based on the information on the TCI state with the lowest TCI state ID among the activated TCI states in the active BWP of the second cell,

wherein in case that the DCI includes the TCI field indicating a TCI state #n, an interval between a symbol in which the transmission of a physical downlink control channel (PDCCH) ends and a start symbol of the PDSCH scheduled by the PDCCH is less than the threshold, and one or more TCI states in a TCI state list configured through radio resource control (RRC) for the PDSCH include a QCL type, the second data is received on the PDSCH, and

wherein the second data is received on the PDSCH based on QCL parameters according to a Release of the terminal.

19. The base station of claim 16 , wherein the controller is further configured to:

receive, from the terminal, capability information of the terminal, the capability information including information indicating that the terminal supports the default beam selection for the PDSCH.

20. The base station of claim 19 , wherein the capability information further includes information on the threshold.