Apparatus and method for beam failure recovery in wireless communication system

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

receiving, from a base station, system information including at least one parameter for a paging; and

monitoring a paging occasion (PO) in a discontinuous reception (DRX) cycle based on the at least one parameter for the paging,

wherein the PO corresponds to a set of one or more physical downlink control channel (PDCCH) monitoring occasions for the paging,

wherein the number of the one or more PDCCH monitoring occasions for the paging in the set is the number of at least one transmitted synchronization signal block (SSB),

wherein PDCCH monitoring occasions are sequentially numbered from zero (0) in a radio frame for the paging,

wherein an index number of a starting PDCCH monitoring occasion of the PO is a multiplication of ‘S’ and an index ‘i_s’ of the PO, and

wherein the ‘S’ is the number of at least one transmitted SSB.

2. The method of claim 1 ,

wherein the monitoring of the PO comprises monitoring one PO per the DRX cycle, and

wherein the one PO is located in a radio frame including one or more paging occasions.

3. The method of claim 1 ,

wherein the at least one parameter includes information on an offset, and

wherein the PO is located in a radio frame that is determined based on the offset identified from the system information, the DRX cycle for the terminal, and an identifier (ID) of the terminal.

4. The method of claim 1 ,

wherein the one or more PDCCH monitoring occasions for the paging are configured in a paging search space indicated by the system information, and

wherein the PO is indicated by an index that is determined based on an ID of the terminal and at least one value associated with the DRX cycle for the terminal.

5. The method of claim 4 , wherein the ID of the terminal is an identity of the terminal mod 1024.

6. The method of claim 1 ,

wherein the monitoring of the PO comprises:

identifying the radio frame for the PO based on the at least one parameter for the paging;

identifying the index ‘i_s’ of the PO; and

monitoring (i_s+1) th paging occasion based on the radio frame, and wherein the radio frame is identified based on a following equation:

(SFN+offset)mod T =( T div N )*(UE_ID mod N )

where ‘SFN’ refers to a system frame number of the radio frame, ‘offset’ refers to a paging offset configured by the system information, ‘T’ refers to the DRX cycle, ‘N’ refers to a value associated with the ‘T’, and ‘UE_ID’ refers to an identifier (ID) of the terminal.

7. The method of claim 1 , wherein a k-th PDCCH monitoring occasion of the one or more PDCCH monitoring occasions of the set corresponds to a k-th SSB of the at least one transmitted SSB.

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

transmitting, to a terminal, system information including at least one parameter for a paging; and

transmitting, to the terminal, a paging message in a paging occasion (PO) in a discontinuous reception (DRX) cycle, based on the at least one parameter for the paging,

wherein the PO corresponds to a set of one or more physical downlink control channel (PDCCH) monitoring occasions for the paging,

wherein the number of the one or more PDCCH monitoring occasions for the paging in the set is the number of at least one transmitted synchronization signal block (SSB),

wherein PDCCH monitoring occasions are sequentially numbered from zero (0) in a radio frame for the paging,

wherein an index number of a starting PDCCH monitoring occasion of the PO is a multiplication of ‘S’ and an index ‘i_s’ of the PO, and

wherein the ‘S’ is the number of at least one transmitted SSB.

9. The method of claim 8 ,

wherein the PO is located in a radio frame including one or more paging occasions.

10. The method of claim 8 , wherein the PO is located in a radio frame that is determined based on an offset identified from the system information, the DRX cycle for the terminal, and an identifier (ID) of the terminal.

11. The method of claim 8 ,

wherein the one or more PDCCH monitoring occasions for the paging are configured in a paging search space indicated by the system information, and

wherein the PO is indicated by an index that is determined based on an ID of the terminal and at least one value associated with the DRX cycle for the terminal.

12. The method of claim 11 , wherein the ID of the terminal is a subscriber identity of the terminal mod 1024.

13. The method of claim 8 , wherein a k-th PDCCH monitoring occasion of the one or more PDCCH monitoring occasions of the set corresponds to a k-th SSB of the at least one transmitted SSB.

14. A terminal in wireless communication system, the terminal comprising:

at least one transceiver; and

at least one processor coupled to the at least one transceiver and configured to:

receive, from a base station, system information including at least one parameter for a paging, and

monitor a paging occasion (PO) in a discontinuous reception (DRX) cycle based on the at least one parameter for the paging,

wherein the PO corresponds to a set of one or more physical downlink control channel (PDCCH) monitoring occasions for the paging,

wherein the number of the one or more PDCCH monitoring occasions for the paging in the set is the number of at least one transmitted synchronization signal block (SSB),

wherein PDCCH monitoring occasions are sequentially numbered from zero (0) in a radio frame for the paging,

wherein an index number of a starting PDCCH monitoring occasion of the PO is a multiplication of ‘S’ and an index ‘i_s’ of the PO, and

wherein the ‘S’ is the number of at least one transmitted SSB.

15. The terminal of claim 14 , wherein the PO is located in a radio frame that is determined based on an offset identified from the system information, the DRX cycle for the terminal, and an identifier (ID) of the terminal.

16. The terminal of claim 14 ,

wherein the one or more PDCCH monitoring occasions for the paging are configured in a paging search space indicated by the system information, and

wherein the PO is indicated by an index that is determined based on an ID of the terminal and at least one value associated with the DRX cycle for the terminal.

17. The terminal of claim 16 , wherein the ID of the terminal is an identity of the terminal mod 1024.

18. The terminal of claim 14 ,

wherein the at least one processor is, in order to monitor the PO, configured to:

identify the radio frame for the PO based on the at least one parameter for the paging,

identify the index ‘i_s’ of the PO, and

monitor (i_s+1) th paging occasion based on the radio frame, and wherein the radio frame is identified based on a following equation:

(SFN+offset)mod T =( T div N )*(UE_ID mod N )

where ‘SFN’ refers to a system frame number of the radio frame, ‘offset’ refers to a paging offset configured by the system information, ‘T’ refers to the DRX cycle, ‘N’ refers to a value associated with the ‘T’, and ‘UE_ID’ refers to an identifier (ID) of the terminal.

19. The terminal of claim 14 , wherein a k-th PDCCH monitoring occasion of the one or more PDCCH monitoring occasions of the set corresponds to a k-th SSB of the at least one SSB.

20. The terminal of claim 14 ,

wherein the at least one processor is, in order to monitor the PO, configured to monitor one PO per the DRX cycle, and

wherein the one PO is located in a radio frame including one or more paging occasions.

21. The terminal of claim 14 ,

wherein PDCCH monitoring occasions are sequentially numbered from zero (0) in a radio frame for the paging,

wherein an index number of a starting PDCCH monitoring occasion of the PO is a multiplication of ‘S’ and an index ‘i_s’ of the PO, and

wherein the ‘S’ is the number of at least one transmitted SSB.

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

at least one transceiver; and

at least one processor coupled to the at least one transceiver and configured to:

transmit, to a terminal, system information including at least one parameter for a paging, and

transmit, to the terminal, a paging message in a paging occasion (PO) in a discontinuous reception (DRX) cycle, based on the at least one parameter for the paging,

wherein the PO corresponds to a set of one or more physical downlink control channel (PDCCH) monitoring occasions for the paging,

wherein the number of the one or more PDCCH monitoring occasions for the paging in the set is the number of at least one transmitted synchronization signal block (SSB),

wherein PDCCH monitoring occasions are sequentially numbered from zero (0) in a radio frame for the paging,

wherein an index number of a starting PDCCH monitoring occasion of the PO is a multiplication of ‘S’ and an index ‘i_s’ of the PO, and

wherein the ‘S’ is the number of at least one transmitted SSB.

23. The base station of claim 22 , wherein a k-th PDCCH monitoring occasion of the one or more PDCCH monitoring occasions of the set corresponds to a k-th SSB of the at least one transmitted SSB.

24. The base station of claim 22 , wherein the PO is located in a radio frame including one or more paging occasions.

25. The base station of claim 22 , wherein the PO is located in a radio frame that is determined based on an offset identified from the system information, the DRX cycle for the terminal, and an identifier (ID) of the terminal.

26. The base station of claim 22 ,

wherein the one or more PDCCH monitoring occasions for the paging are configured in a paging search space indicated by the system information, and

wherein the PO is indicated by an index that is determined based on an ID of the terminal and at least one value associated with the DRX cycle for the terminal.

27. The base station of claim 26 , wherein the ID of the terminal is a subscriber identity of the terminal mod 1024.