Methods and apparatuses for TCI state indication in a wireless communications system
Methods and apparatuses for transmission configuration indication (TCI) state indication in a wireless communication system. A method for operating a user equipment (UE) includes receiving a downlink control information (DCI) including at least one TCI codepoint indicating first and second TCI states; determining, based on the first or second TCI states, a third quasi co-location (QCL) assumption for receiving a physical downlink control channel (PDCCH); and receiving the PDCCH that schedules first or second transmission occasions of a first or second physical downlink shared channels (PDSCHs), respectively. The method further includes receiving information on PDSCH repetition schemes; determining, based on the first or second TCI states, a first QCL assumption for receiving the first PDSCH; and determining, based on the first or second TCI states, a second QCL assumption for receiving the second PDSCH.
1 . A user equipment (UE), comprising:
a transceiver configured to:
receive, via higher layer signaling, a configuration of a list of transmission configuration indication (TCI) states, wherein the TCI states in the list are joint TCI states for downlink and uplink;
receive a first medium access control control element (MAC CE) associated with the list of TCI states, wherein the first MAC CE includes a first identification indicating a first control resource set (CORESET) pool index; and
receive a second MAC CE associated with the list of TCI states, wherein the second MAC CE includes a second identification indicating a second CORESET pool index; and
a processor operably coupled to the transceiver, the processor configured to:
identify, among the list of TCI states based on the first MAC CE, a first TCI state corresponding to the first CORESET pool index; and
identify, among the list of TCI states based on the second MAC CE, a second TCI state corresponding to the second CORESET pool index,
wherein the transceiver is further configured to:
perform a first physical downlink shared channel (PDSCH) reception and a first physical uplink shared channel (PUSCH) transmission based on the first TCI state; and
perform a second PDSCH reception and a second PUSCH transmission based on the second TCI state.
2 . The UE of claim 1 , wherein:
the first MAC CE indicates a single TCI state among the list of TCI states and the first TCI state is the single TCI state indicated by the first MAC CE, and
the second MAC CE indicates a single TCI state among the list of TCI states and the second TCI state is the single TCI state indicated by the second MAC CE.
3 . The UE of claim 1 , wherein:
the first PDSCH reception and the first PUSCH transmission are associated with the first CORESET pool index, and
the second PDSCH reception and the second PUSCH transmission are associated with the second CORESET pool index.
4 . The UE of claim 1 , wherein:
the processor is further configured to:
identify two indicated TCI states among the list of TCI states; and
determine, based on an explicit indication received via the higher layer signaling or downlink control information, association between the two indicated TCI states and a third PDSCH reception; and
the transceiver is further configured to perform the third PDSCH reception based on the determined association.
5 . A base station (BS), comprising:
a processor; and
a transceiver operably coupled to the processor, the transceiver configured to:
transmit, via higher layer signaling, a configuration of a list of transmission configuration indication (TCI) states, wherein the TCI states in the list are joint TCI states for downlink and uplink;
transmit a first medium access control control element (MAC CE) associated with the list of TCI states, wherein the first MAC CE includes a first identification indicating a first control resource set (CORESET) pool index;
transmit a second MAC CE associated with the list of TCI states, wherein the second MAC CE includes a second identification indicating a second CORESET pool index;
perform a first physical downlink shared channel (PDSCH) transmission and a first physical uplink shared channel (PUSCH) reception based on a first TCI state among the list of TCI states, wherein the first TCI state corresponds to the first CORESET pool index; and
perform a second PDSCH transmission and a second PUSCH reception based on a second TCI state among the list of TCI states, wherein the second TCI state corresponds to the second CORESET pool index.
6 . The BS of claim 5 , wherein:
the first MAC CE indicates a single TCI state among the list of TCI states and the first TCI state is the single TCI state indicated by the first MAC CE, and
the second MAC CE indicates a single TCI state among the list of TCI states and the second TCI state is the single TCI state indicated by the second MAC CE.
7 . The BS of claim 5 , wherein:
the first PDSCH transmission and the first PUSCH reception are associated with the first CORESET pool index, and
the second PDSCH transmission and a second PUSCH reception associated with the second CORESET pool index.
8 . The BS of claim 5 , wherein:
the processor is further configured to determine association between two indicated TCI states among the list of TCI states and third PDSCH transmission; and
the transceiver is further configured to:
transmit, via the higher layer signaling or downlink control information, an explicit indication corresponding to the association; and
perform the third PDSCH transmission based on the determined association.
9 . A method for operating a user equipment (UE), the method comprising:
receiving, via higher layer signaling, a configuration of a list of transmission configuration indication (TCI) states, wherein the TCI states in the list are (i) joint TCI states for downlink and uplink or (ii) separate TCI states for downlink;
receiving a first medium access control control element (MAC CE) associated with the list of TCI states, wherein the first MAC CE includes a first identification indicating a first control resource set (CORESET) pool index;
receiving a second MAC CE associated with the list of TCI states, wherein the second MAC CE includes a second identification indicating a second CORESET pool index;
identifying, among the list of TCI states based on the first MAC CE, a first TCI state corresponding to the first CORESET pool index;
identifying, among the list of TCI states based on the second MAC CE, a second TCI state corresponding to the second CORESET pool index;
performing a first physical downlink shared channel (PDSCH) reception and a first physical uplink shared channel (PUSCH) transmission based on the first TCI state; and
performing a second PDSCH reception and a second PUSCH transmission based on the second TCI state.
10 . The method of claim 9 , wherein:
the first MAC CE indicates a single TCI state among the list of TCI states and the first TCI state is the single TCI state indicated by the first MAC CE, and
the second MAC CE indicates a single TCI state among the list of TCI states and the second TCI state is the single TCI state indicated by the second MAC CE.
11 . The method of claim 9 , wherein:
the first PDSCH reception and the first PUSCH transmission are associated with the first CORESET pool index, and
the second PDSCH reception and the second PUSCH transmission are associated with the second CORESET pool index.
12 . The method of claim 9 , further comprising:
identifying two indicated TCI states among the list of TCI states;
determining, based on an explicit indication received via the higher layer signaling or downlink control information, association between the two indicated TCI states and a third PDSCH reception; and
performing the third PDSCH reception based on the determined association.