Enhanced MAC-CE and RRC IE for multi-carrier configurations
Currently, the MIMO MAC-CEs have been designed to support only one component carrier. Aspects described herein provide MAC-CEs and RRC signaling, which may facilitate efficient spatial and beam change indications for multiple component carriers. A UE may be configured to receive a configuration for each of a plurality of carriers. The UE may be configured to receive control information in a MAC-CE. The control information may comprise at least one of a TCI state, an CSI-RS resource configuration, or an SRS resource configuration. The UE may be further configured to determine whether the control information applies to multiple carriers from among the plurality of carriers. The UE may be configured to apply the control information to at least one of the plurality of carriers based on a determination of whether the control information applies to multiple carriers from among the plurality of carriers.
1 . A method of wireless communication at a user equipment (UE), comprising:
receiving a radio resource control (RRC) configuration of a set of serving cells;
receiving a medium access control-control element (MAC-CE) that indicates at least one of a transmission configuration indication (TCI) state or a spatial relation and further indicates a cell index for a single serving cell included in the set of serving cells indicated in the RRC configuration; and
applying the TCI state or the spatial relation indicated in the MAC-CE to each serving cell in the set of serving cells based on the cell index in the MAC-CE being for the single serving cell that is included in the set of serving cells configured in the RRC configuration.
2 . The method of claim 1 , wherein the MAC-CE further indicates at least one of a channel state information reference signal (CSI-RS) resource configuration or a sounding reference signal (SRS) resource configuration for the set of serving cells.
3 . The method of claim 1 , wherein the RRC configuration indicates the set of serving cells in a list that comprises a serving cell index for each serving cell in the set of serving cells.
4 . The method of claim 3 , wherein the list is comprised in an information element (IE) of a cell group configuration in an RRC message.
5 . The method of claim 1 , wherein the MAC-CE indicates the TCI state and wherein the TCI state is applied to each of the set of serving cells based on the cell index in the MAC-CE corresponding to one serving cell of the set of serving cells configured in the RRC configuration.
6 . The method of claim 1 , wherein the MAC-CE further comprises a channel state information reference signal (CSI-RS) resource configuration, and wherein the CSI-RS resource configuration is applied to each of the set of serving cells.
7 . The method of claim 1 , wherein the MAC-CE further comprises a sounding reference signal (SRS) resource configuration, and wherein the SRS resource configuration is applied to each of the set of serving cells.
8 . The method of claim 1 , wherein the MAC-CE indicates the spatial relation for uplink transmissions, and wherein the spatial relation is applied to each serving cell of the set of serving cells based on the cell index in the MAC-CE corresponding to one of the set of serving cells configured in the RRC configuration.
9 . The method of claim 1 , wherein applying the TCI state or the spatial relation indicated in the MAC-CE includes applying the TCI state for reception of a physical downlink shared channel (PDSCH).
10 . The method of claim 1 , wherein applying the TCI state or the spatial relation indicated in the MAC-CE includes applying the spatial relation for transmission of uplink communication.
11 . The method of claim 1 , wherein the RRC configuration is for automatic application of the TCI state or the spatial relation for other serving cells indicated in the set of serving cells when the MAC-CE is received that indicates one serving cell in the set of serving cells without receiving additional indications for the other serving cells in the MAC-CE.
12 . The method of claim 1 , wherein the RRC configuration indicates the set of serving cells to which to apply at least one of the TCI state or the spatial relation indicated by the MAC-CE.
13 . A method of wireless communication at a base station, comprising:
configuring a user equipment (UE) with a radio resource control (RRC) configuration of a set of serving cells; and
transmitting a medium access control-control element (MAC-CE) that indicates at least one of a transmission configuration indication (TCI) state or a spatial relation and further indicates a cell index for a single serving cell included in the set of serving cells indicated in the RRC configuration to switch the TCI state or the spatial relation for each serving cell in the set of serving cells.
14 . The method of claim 13 , wherein the MAC-CE further indicates a channel state information reference signal (CSI-RS) resource configuration or a sounding reference signal (SRS) resource configuration for the set of serving cells.
15 . The method of claim 13 , wherein the RRC configuration indicates the set of serving cells in a list that comprises a serving cell indicate for each serving cell in the set of serving cells, and wherein the MAC-CE includes a single serving cell index that indicates one serving cell from a set of serving cell indexes indicated in the list.
16 . The method of claim 15 , wherein the list is indicated in an information element (IE) of a cell group configuration in an RRC message.
17 . The method of claim 13 , wherein the MAC-CE indicates the TCI state.
18 . The method of claim 13 , wherein the MAC-CE comprises a channel state information reference signal (CSI-RS) resource configuration for the set of serving cells configured in the RRC configuration.
19 . The method of claim 13 , wherein the MAC-CE comprises a sounding reference signal (SRS) resource configuration for the set of serving cells configured in the RRC configuration.
20 . The method of claim 13 , wherein the MAC-CE indicates the spatial relation.
21 . The method of claim 13 , wherein the RRC configuration is for automatic application of the TCI state or the spatial relation for other serving cells indicated in the set of serving cells when the MAC-CE is received that indicates one serving cell in the set of serving cells without receiving additional indications for the other serving cells in the MAC-CE.
22 . An apparatus for wireless communication at a user equipment (UE), comprising:
memory; and
at least one processor coupled to the memory and configured to:
receive a radio resource control (RRC) configuration of a set of serving cells;
receive a medium access control-control element (MAC-CE) that indicates at least one of a transmission configuration indication (TCI) state or a spatial relation and further indicates a cell index for a single serving cell included in the set of serving cells indicated in the RRC configuration; and
apply the TCI state or the spatial relation indicated in the MAC-CE to each serving cell in the set of serving cells based on the cell index in the MAC-CE being for the single serving cell that is included in the set of serving cells configured in the RRC configuration.
23 . The apparatus of claim 22 , wherein the RRC configuration indicates the set of serving cells in a list that comprises a serving cell index for each serving cell in the set of serving cells.
24 . The apparatus of claim 23 , wherein the list is comprised in an information element (IE) of a cell group configuration in an RRC message.
25 . The apparatus of claim 22 , wherein the MAC-CE indicates the TCI state and wherein the TCI state is applied to each of the set of serving cells based on the cell index in the MAC-CE corresponding to one serving cell of the set of serving cells configured in the RRC configuration.
26 . The apparatus of claim 22 , wherein the MAC-CE indicates the spatial relation for uplink transmissions, and wherein the spatial relation is applied to each serving cell of the set of serving cells based on the cell index in the MAC-CE corresponding to one of the set of serving cells configured in the RRC configuration.
27 . The apparatus of claim 22 , wherein application of the TCI state or the spatial relation indicated in the MAC-CE includes use of the TCI state for reception of a physical downlink shared channel (PDSCH).
28 . The apparatus of claim 22 , wherein application of the TCI state or the spatial relation indicated in the MAC-CE includes use of the spatial relation for transmission of uplink communication.
29 . The apparatus of claim 22 , wherein the RRC configuration is for automatic application of the TCI state or the spatial relation for other serving cells indicated in the set of serving cells when the MAC-CE is received that indicates one serving cell in the set of serving cells without receiving additional indications for the other serving cells in the MAC-CE.
30 . The apparatus of claim 22 , wherein the RRC configuration indicates the set of serving cells to which to apply at least one of the TCI state or the spatial relation indicated by the MAC-CE.
31 . An apparatus for wireless communication at a base station, comprising:
memory; and
at least one processor coupled to the memory and configured to:
configure a user equipment (UE) with a radio resource control (RRC) configuration of a set of serving cells; and
transmit a medium access control-control element (MAC-CE) that indicates at least one of a transmission configuration indication (TCI) state or a spatial relation and further indicates a cell index for a single serving cell included in the set of serving cells indicated in the RRC configuration to switch the TCI state or the spatial relation for each serving cell in the set of serving cells.
32 . The apparatus of claim 31 , wherein the RRC configuration indicates the set of serving cells in a list that comprises a serving cell indicate for each serving cell in the set of serving cells, and wherein the MAC-CE includes a single serving cell index that indicates one serving cell from a set of serving cell indexes indicated in the list.
33 . The apparatus of claim 32 , wherein the list is indicated in an information element (IE) of a cell group configuration in an RRC message.
34 . The apparatus of claim 31 , wherein the MAC-CE indicates the TCI state.
35 . The apparatus of claim 31 , wherein the MAC-CE indicates the spatial relation.