Method and apparatus for beam failure recovery in multi-DCI based multiple TRPS

1 . A method performed by a user equipment (UE), the method comprising:

receiving a configuration including a plurality of sets of failure detection beams and a plurality of sets of candidate beams,

wherein each set of failure detection beams and each set of candidate beams are associated with one of a plurality of control resource set (CORESET) pool index (CORESETPoolIndex) values;

transmitting a beam failure recovery request in an uplink transmission when all beams in a set of failure detection beams in the plurality of sets of failure detection beams associated with a CORESETPoolIndex value of the plurality of CORESETPoolIndex values fail,

wherein the uplink transmission is a transmission by a physical uplink shared channel (PUSCH) carrying a medium access control (MAC) control element (CE) to indicate a beam or no beam from the set of candidate beams associated with the CORESETPoolIndex value,

wherein power of the beam in the set of candidate beams is larger than or equal to a threshold,

wherein the plurality of CORESETPoolIndex values are two CORESETPoolIndex values including CORESETPoolIndex 0 and CORESETPoolIndex 1 and the CORESETPoolIndex value is CORESETPoolIndex 1, and the uplink transmission is a transmission by a physical uplink shared channel (PUSCH) carrying a medium access control (MAC) control element (CE) to indicate a beam or no beam from the set of candidate beams associated with CORESETPoolIndex 1,

wherein power of the beam in the set of candidate beams is larger than or equal to a threshold receiving a downlink control information (DCI) in a physical downlink control channel (PDCCH) to schedule a PUSCH transmission with a same hybrid automatic repeat request (HARQ) process number as for the transmission of the PUSCH and having a toggled new data indicator (NDI) field value and after a number of symbols from a last symbol of the PDCCH:

monitoring PDCCH in all CORESETs associated with CORESETPoolIndex 1 by using the same antenna port quasi-collocation parameters as the ones associated with the beam; and transmitting a physical uplink control channel (PUCCH) resource associated with CORESETPoolIndex 1 by using the beam and a power determined based on the beam and a closed loop index corresponding to CORESETPoolIndex 1.

2 . The method of claim 1 , wherein a set of failure detection beams associated with the CORESETPoolIndex value includes:

a set of periodic channel state information-reference signal (CSI-RS) resource configuration indexes configured by radio resource control (RRC) signaling;

a set of periodic CSI-RS resource configuration indexes with same values as RS indexes in RS sets indicated by TCI-State for control resource sets (CORESETs) associated with the CORESETPoolIndex value if there is only one RS index in a transmission configuration indicator (TCI) state;

a set of periodic CSI-RS resource configuration indexes with same values as RS indexes with quasi co-location (QCL)-TypeD configuration for the corresponding TCI states if there are two RS indexes in a TCI state of any CORESET associated with the CORESETPoolIndex value;

or any combination thereof.

3 . The method of claim 1 , wherein a set of candidate beams associated with the CORESETPoolIndex value includes:

a set of periodic CSI-RS resource configuration indexes;

a set of synchronization signal (SS)/physical broadcast channel (PBCH) block indexes;

or a combination thereof.

4 . The method of claim 1 , further comprising:

receiving a downlink control information (DCI) in a PDCCH to schedule a PUSCH transmission with a same hybrid automatic repeat request (HARQ) process number as for the transmission of the PUSCH and having a toggled new data indicator (NDI) field value.

5 . The method of claim 4 , further comprising:

after a number of symbols from a last symbol of the PDCCH, monitoring PDCCH in all CORESETs associated with the CORESETPoolIndex value by using the same antenna port quasi-collocation parameters as the ones associated with the beam.

6 . The method of claim 1 , wherein the plurality of CORESETPoolIndex values are two CORESETPoolIndex values including CORESETPoolIndex 0 and CORESETPoolIndex 1 and the CORESETPoolIndex value is CORESETPoolIndex 0, and the uplink transmission is a transmission by a physical random access channel (PRACH) which is associated with a beam in the set of candidate beams associated with CORESETPoolIndex 0, wherein power of the beam in the set of candidate beams is larger than or equal to a threshold.

7 . The method of claim 6 , further comprising:

monitoring a physical downlink control channel (PDCCH) in a recovery search space associated with CORESETPoolIndex 0 by using same antenna port quasi-collocation parameters as the ones associated with the beam.

8 . The method of claim 7 , further comprising:

after a number of symbols from a last symbol of the PDCCH,

monitoring PDCCH in all CORESETs associated with CORESETPoolIndex 0 by using the same antenna port quasi-collocation parameters as the ones associated with the beam; and

transmitting a physical uplink control channel (PUCCH) resource associated with CORESETPoolIndex 0 by using the beam and a power determined based on the beam and a closed loop index corresponding to CORESETPoolIndex 0.

9 . A user equipment (UE), comprising:

at least one memory; and

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

receive a configuration including a plurality of sets of failure detection beams and a plurality of sets of candidate beams,

wherein each set of failure detection beams and each set of candidate beams are associated with one of a plurality of control resource set (CORESET) pool index (CORESETPoolIndex) values;

transmit a beam failure recovery request in an uplink transmission when all beams in a set of failure detection beams in the plurality of sets of failure detection beams associated with a CORESETPoolIndex value of the plurality of CORESETPoolIndex values fail,

wherein the uplink transmission is a transmission by a physical uplink shared channel (PUSCH) carrying a medium access control (MAC) control element (CE) to indicate a beam or no beam from the set of candidate beams associated with the CORESETPoolIndex value,

wherein power of the beam in the set of candidate beams is larger than or equal to a threshold,

wherein the plurality of CORESETPoolIndex values are two CORESETPoolIndex values including CORESETPoolIndex 0 and CORESETPoolIndex 1 and the CORESETPoolIndex value is CORESETPoolIndex 1, and the uplink transmission is a transmission by a physical uplink shared channel (PUSCH) carrying a medium access control (MAC) control element (CE) to indicate a beam or no beam from the set of candidate beams associated with CORESETPoolIndex 1,

wherein power of the beam in the set of candidate beams is larger than or equal to a threshold;

receive a downlink control information (DCI) in a physical downlink control channel (PDCCH) to schedule a PUSCH transmission with a same hybrid automatic repeat request (HARQ) process number as for the transmission of the PUSCH and having a toggled new data indicator (NDI) field value; and

after a number of symbols from a last symbol of the PDCCH:

monitor PDCCH in all CORESETs associated with CORESETPoolIndex 1 by using the same antenna port quasi-collocation parameters as the ones associated with the beam; and

transmit a physical uplink control channel (PUCCH) resource associated with CORESETPoolIndex 1 by using the beam and a power determined based on the beam and a closed loop index corresponding to CORESETPoolIndex 1.

10 . The UE of claim 9 , wherein a set of failure detection beams associated with the CORESETPoolIndex value includes:

a set of periodic channel state information-reference signal (CSI-RS) resource configuration indexes configured by radio resource control (RRC) signaling;

a set of periodic CSI-RS resource configuration indexes with same values as RS indexes in RS sets indicated by TCI-State for control resource sets (CORESETs) associated with the CORESETPoolIndex value if there is only one RS index in a transmission configuration indicator (TCI) state;

a set of periodic CSI-RS resource configuration indexes with same values as RS indexes with quasi co-location (QCL)-TypeD configuration for the corresponding TCI states if there are two RS indexes in a TCI state of any CORESET associated with the CORESETPoolIndex value;

or any combination thereof.

11 . The UE of claim 9 , wherein a set of candidate beams associated with the CORESETPoolIndex value includes:

a set of periodic CSI-RS resource configuration indexes;

a set of synchronization signal (SS)/physical broadcast channel (PBCH) block indexes;

or a combination thereof.

12 . A base station, comprising:

at least one memory; and

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

transmit a configuration including a plurality of sets of failure detection beams and a plurality of sets of candidate beams,

wherein each set of failure detection beams and each set of candidate beams are associated with one of a plurality of control resource set (CORESET) pool index (CORESETPoolIndex) values;

receive a beam failure recovery request in an uplink transmission when all beams in a set of failure detection beams in the plurality of sets of failure detection beams associated with a CORESETPoolIndex value of the plurality of CORESETPoolIndex values fail,

wherein the uplink transmission is a transmission by a physical uplink shared channel (PUSCH) carrying a medium access control (MAC) control element (CE) to indicate a beam or no beam from the set of candidate beams associated with the CORESETPoolIndex value,

wherein power of the beam in the set of candidate beams is larger than or equal to a threshold,

wherein the plurality of CORESETPoolIndex values are two CORESETPoolIndex values including CORESETPoolIndex 0 and CORESETPoolIndex 1 and the CORESETPoolIndex value is CORESETPoolIndex 1, and the uplink transmission is a transmission by a physical uplink shared channel (PUSCH) carrying a medium access control (MAC) control element (CE) to indicate a beam or no beam from the set of candidate beams associated with CORESETPoolIndex 1,

wherein power of the beam in the set of candidate beams is larger than or equal to a threshold;

transmit a downlink control information (DCI) in a physical downlink control channel (PDCCH) to schedule a PUSCH transmission with a same hybrid automatic repeat request (HARQ) process number as for the transmission of the PUSCH and having a toggled new data indicator (NDI) field value; and

after a number of symbols from a last symbol of the PDCCH, receive a physical uplink control channel (PUCCH) resource associated with CORESETPooIndex 1 by using the beam and a power determined based on the beam and a closed loop index corresponding to CORESETPoolIndex 1.

13 . The base station of claim 12 , wherein a set of failure detection beams associated with the CORESETPoolIndex value includes:

a set of periodic channel state information-reference signal (CSI-RS) resource configuration indexes configured by radio resource control (RRC) signaling;

a set of periodic CSI-RS resource configuration indexes with same values as RS indexes in RS sets indicated by TCI-State for control resource sets (CORESETs) associated with the CORESETPoolIndex value if there is only one RS index in a transmission configuration indicator (TCI) state;

a set of periodic CSI-RS resource configuration indexes with same values as RS indexes with quasi co-location (QCL)-TypeD configuration for the corresponding TCI states if there are two RS indexes in a TCI state of any CORESET associated with the CORESETPoolIndex value;

or any combination thereof.

14 . The base station of claim 12 , wherein a set of candidate beams associated with the CORESETPoolIndex value includes:

a set of periodic CSI-RS resource configuration indexes;

a set of synchronization signal (SS)/physical broadcast channel (PBCH) block indexes;

or a combination thereof.