Channel state information reference signal (CSI-RS) for multiple beam transmissions
Certain aspects of the present disclosure provide techniques for channel state information reference signal (CSI-RS) for multiple beam transmissions. In an example, a first CSI-RS triggering state of one or more CSI-RS triggering states indicates a CSI-RS resource set and associated transmission configuration indication (TCI) states. The CSI-RS resource set includes a plurality of CSI-RS resources. Each CSI-RS resource of the plurality of CSI-RS resources is associated with one or more corresponding TCI states as indicated by the first CSI-RS triggering state. A first CSI-RS resource of the plurality of CSI-RS resources is associated with a first plurality of TCI states as indicated by the first CSI-RS triggering state.
1 . A method of wireless communication by a user equipment (UE), the method comprising:
receiving a configuration indicating a channel state information reference signal (CSI-RS) resource is associated with a plurality of transmission configuration indication (TCI) states, wherein the configuration comprises:
a first configuration of multiple TCI states, the first configuration being associated with first indexes, and
a second configuration for activation of a subset of the multiple TCI states, the second configuration being associated with second indexes;
measuring CSI-RS on the CSI-RS resource;
receiving an indication of the plurality of TCI states as associated with a downlink transmission, the plurality of TCI states being indicated using an index of the second indexes; and
receiving the downlink transmission using at least one receive parameter that is based on the measured CSI-RS.
2 . The method of claim 1 , wherein the CSI-RS is received as multiple beams using multiple antenna modules or arrays.
3 . The method of claim 1 , wherein the configuration indicates whether the CSI-RS resource is associated with a multiplexed transmission or a single-frequency network transmission.
4 . The method of claim 1 , wherein the configuration is received via radio resource control (RRC) signaling or media access control-control element (MAC-CE), and wherein the indication is received via MAC-CE or downlink control information (DCI).
5 . The method of claim 1 , further comprising:
receiving a trigger for measurement of the CSI-RS, the trigger indicating the plurality of TCI states.
6 . The method of claim 1 , wherein the at least one receive parameter comprises at least one of at least one receive beam, a precoding, a rank, or a channel quality indicator.
7 . The method of claim 1 , further comprising receiving a trigger for measurement of CSI-RS, wherein the CSI-RS on the CSI-RS resource is measured in response to the trigger.
8 . A method of wireless communication by a network entity,
the method comprising:
sending a configuration indicating a channel state information reference signal (CSI-RS) resource is associated with a plurality of transmission configuration indication (TCI) states, wherein the configuration comprises:
a first configuration of multiple TCI states, the first configuration being associated with first indexes, and
a second configuration for activation of a subset of the multiple TCI states, the second configuration being associated with second indexes;
sending an indication of the plurality of TCI states as associated with a downlink transmission, the plurality of TCI states being indicated using an index of the second indexes; and
sending the downlink transmission for reception by a receiving device using at least one receive parameter determined based on a measured CSI-RS.
9 . The method of claim 8 , further comprising sending a CSI-RS on the CSI-RS resource using multiple beams.
10 . The method of claim 8 , wherein the configuration indicates whether the CSI-RS resource is associated with a multiplexed transmission or a single-frequency network transmission.
11 . The method of claim 8 , wherein the configuration is sent via radio resource control (RRC) signaling or media access control-control element (MAC-CE), and wherein the indication is sent via MAC-CE or downlink control information (DCI).
12 . The method of claim 8 , further comprising:
sending a trigger for measurement of a CSI-RS on the CSI-RS resource, the trigger indicating the plurality of TCI states.
13 . A user equipment (UE) comprising:
memory; and
one or more processors coupled to the memory, wherein the memory and the one or more processors are configured to:
receive a configuration indicating a channel state information reference signal (CSI-RS) resource is associated with a plurality of transmission configuration indication (TCI) states, wherein the configuration comprises:
a first configuration of multiple TCI states, the first configuration being associated with first indexes, and
a second configuration for activation of a subset of the multiple TCI states, the second configuration being associated with second indexes;
measure CSI-RS on the CSI-RS resource;
receive an indication of the plurality of TCI states as associated with a downlink transmission, the plurality of TCI states being indicated using an index of the second indexes; and
receive the downlink transmission using at least one receive parameter that is based on the measured CSI-RS.
14 . The UE of claim 13 , wherein the CSI-RS is received as multiple beams using multiple antenna modules or arrays.
15 . The UE of claim 13 , wherein the configuration indicates whether the CSI-RS resource is associated with a multiplexed transmission or a single-frequency network transmission.
16 . The UE of claim 13 , wherein the configuration is received via radio resource control (RRC) signaling or media access control-control element (MAC-CE), and wherein the indication is received via MAC-CE or downlink control information (DCI).
17 . The UE of claim 13 , wherein the memory and the one or more processors are configured to:
receive a trigger for measurement of the CSI-RS, the trigger indicating the plurality of TCI states.
18 . The UE of claim 13 , wherein the at least one receive parameter comprises at least one of at least one receive beam, a precoding, a rank, or a channel quality indicator.
19 . A network entity comprising:
memory; and
one or more processors coupled to the memory, wherein the memory and the one or more processors are configured to:
send a configuration indicating a channel state information reference signal (CSI-RS) resource is associated with a plurality of transmission configuration indication (TCI) states, wherein the configuration comprises:
a first configuration of multiple TCI states, the first configuration being associated with first indexes, and
a second configuration for activation of a subset of the multiple TCI states, the second configuration being associated with second indexes;
send an indication of the plurality of TCI states as associated with a downlink transmission, the plurality of TCI states being indicated using an index of the second indexes; and
send the downlink transmission for reception by a receiving device using at least one receive parameter determined based on a measured CSI-RS.
20 . The network entity of claim 19 , wherein the memory and the one or more processors are configured to send a CSI-RS on the CSI-RS resource using multiple beams.
21 . The network entity of claim 19 , wherein the configuration indicates whether the CSI-RS resource is associated with a multiplexed transmission or a single-frequency network transmission.
22 . The network entity of claim 19 , wherein the memory and the one or more processors are configured to:
send a trigger for measurement of a CSI-RS on the CSI-RS resource, the trigger indicating the plurality of TCI states.