Multi-beam operations for multiple component carriers
A method for operating a UE comprises receiving configuration information including a list of CCs and a set of TCI states; receiving, based on the configuration information, a TCI state update via a medium, wherein: the TCI state update is common for a first subset of CCs, the first subset of CCs includes n≤N CCs, and N=a number of CCs in the list of CCs; and for each CC(i) in the first subset of CCs, determining a beam based on the TCI state update, and applying the beam for a reception of a downlink control channel or a downlink data channel associated with the CC(i), wherein i is an index and takes a value from {1, 2, . . . , n}, wherein the beam is determined based on a spatial quasi-co-location property used to receive or transmit a source RS indicated via the TCI state update.
1. A user equipment (UE) comprising:
a transceiver configured to:
receive configuration information including a list of component carriers (CCs) and a set of transmission configuration indicator (TCI) states, and
receive, based on the configuration information, a TCI state update via a medium, wherein:
the TCI state update is common for a first subset of CCs,
the first subset of CCs includes n≤N CCs, and
N=a number of CCs in the list of CCs; and
a processor operably coupled to the transceiver, the processor configured to:
for each CC(i) in the first subset of CCs,
determine a beam based on the TCI state update, and
apply the beam for a reception of a downlink (DL) control channel or a DL data channel associated with the CC(i), wherein i is an index and takes a value from {1, 2, . . . , n},
wherein the beam is determined based on a spatial quasi-co-location (QCL) property used to receive or transmit a source reference signal (RS) indicated via the TCI state update.
2. The UE of claim 1 , wherein the TCI state update corresponds to an identifier (ID) of a TCI state that includes a single source RS that determines the beam for all CCs in the first subset of CCs.
3. The UE of claim 2 , wherein the TCI state including the single source RS is received via the medium that is associated with a CC from the set of CCs, where the CC is configured via higher layer signaling.
4. The UE of claim 1 , wherein the set of TCI states are common for all CCs and are received in a reference CC, and an information about the set of TCI states being in the reference CC is configured via higher signaling.
5. The UE of claim 1 , wherein the medium is a downlink control information (DCI).
6. The UE of claim 1 , wherein the medium is a medium access control-control element (MAC-CE).
7. The UE of claim 1 , wherein, in response to the TCI state update indicating a joint TCI state for both DL and uplink (UL), the processor is configured to apply the beam for the CC(i) for a transmission of an UL control channel or an UL data channel associated with the CC(i).
8. The UE of claim 1 , wherein, in response to the TCI state update indicating two separate TCI states for DL and uplink (UL), a DL TCI state and an UL TCI state, respectively, the processor is configured to:
for each CC(i):
determine the beam based on the DL TCI state,
determine an UL transmit beam based on the UL TCI state, and
apply the UL transmit beam for a transmission of an UL control channel or an UL data channel associated with the CC(i).
9. A base station (BS) comprising:
a processor configured to:
generate configuration information including a list of component carriers (CCs) and a set of transmission configuration indicator (TCI) states, and
generate, based on the configuration information, a TCI state update via a medium, wherein:
the TCI state update is common for a first subset of CCs,
the first subset of CCs includes n≤N CCs, and
N=a number of CCs in the list of CCs; and
a transceiver operably coupled to the processor, the transceiver configured to:
transmit the configuration information,
transmit the TCI state update via the medium,
for each CC(i) in the first subset of CCs,
transmit a downlink (DL) control channel or a DL data channel associated with the CC(i) for reception via a beam, wherein i is an index and takes a value from {1, 2, . . . , n},
wherein the beam is based on a spatial quasi-co-location (QCL) property used to receive or transmit a source reference signal (RS) indicated via the TCI state update.
10. The BS of claim 9 , wherein the TCI state update corresponds to an identifier (ID) of a TCI state that includes a single source RS that determines the beam for all CCs in the first subset of CCs.
11. The BS of claim 10 , wherein the TCI state including the single source RS is transmitted via the medium that is associated with a CC from the set of CCs, where the CC is configured via higher layer signaling.
12. The BS of claim 9 , wherein the set of TCI states are common for all CCs and are transmitted in a reference CC, and an information about the set of TCI states being in the reference CC is configured via higher signaling.
13. The BS of claim 9 , wherein the medium is a downlink control information (DCI).
14. The BS of claim 9 , wherein the medium is a medium access control-control element (MAC-CE).
15. The BS of claim 9 , wherein, in response to the TCI state update indicating a joint TCI state for both DL and uplink (UL), the transceiver is configured to receive an UL control channel or an UL data channel associated with the CC(i) transmitted via the beam.
16. The BS of claim 9 , wherein, in response to the TCI state update indicating two separate TCI states for DL and uplink (UL), a DL TCI state and an UL TCI state, respectively, the transceiver is configured to:
for each CC(i):
transmit a DL control channel or a DL data channel for reception via the beam determined based on the DL TCI state, and
receive an UL control channel or an UL data channel transmitted via an UL transmit beam that is determined based on the UL TCI state.
17. A method for operating a user equipment (UE), the method comprising:
receiving configuration information including a list of component carriers (CCs) and a set of transmission configuration indicator (TCI) states;
receiving, based on the configuration information, a TCI state update via a medium, wherein:
the TCI state update is common for a first subset of CCs,
the first subset of CCs includes n≤N CCs, and
N=a number of CCs in the list of CCs; and
for each CC(i) in the first subset of CCs,
determining a beam based on the TCI state update, and
applying the beam for a reception of a downlink (DL) control channel or a DL data channel associated with the CC(i), wherein i is an index and takes a value from {1, 2, . . . , n},
wherein the beam is determined based on a spatial quasi-co-location (QCL) property used to receive or transmit a source reference signal (RS) indicated via the TCI state update.
18. The method of claim 17 , wherein the TCI state update corresponds to an identifier (ID) of a TCI state that includes a single source RS that determines the beam for all CCs in the first subset of CCs.
19. The method of claim 18 , further comprising receiving the TCI state including the single source RS via the medium that is associated with a CC from the set of CCs, where the CC is configured via higher layer signaling.
20. The method of claim 17 , further comprising receiving the set of TCI states in a reference CC, wherein the TCI states are common for all CCs, and an information about the set of TCI states being in the reference CC is configured via higher signaling.