SIGNALING FOR UPLINK BEAM ACTIVATION
A configuration to configure a UE to activate a subset of configured UL-TCI states. The apparatus receives a configuration of UL-TCI states and an activation of a subset of configured UL-TCI states. The apparatus receives DCI in a PDCCH scheduling an UL transmission with one or more TCI states of activated TCI states. The apparatus transmits the UL transmission based on the one or more TCI states.
1 . (canceled)
2 . A method of wireless communication at a user equipment (UE), comprising:
receiving a configuration of uplink (UL) transmission configuration indicator (TCI) (UL-TCI) states that comprise configured UL-TCI states, wherein the configured UL-TCI states are initially deactivated upon the configuration;
receiving an activation of a subset of the configured UL-TCI states, the subset of the configured UL-TCI states comprising activated UL-TCI states;
receiving downlink control information (DCI) in a physical downlink control channel (PDCCH) scheduling a sounding reference signal (SRS) transmission with one or more UL-TCI states of the activated UL-TCI states; and
transmitting the SRS transmission based on the one or more UL-TCI states, wherein transmitting the SRS transmission comprises transmitting the SRS transmission with a quasi-co location (QCL) property associated with the one or more UL-TCI states, and wherein each UL-TCI state in the configured UL-TCI states corresponds to a first reference signal associated with indicating a UL transmit (Tx) beam configuration for a UL channel or a UL reference signal.
3 . The method of claim 2 , wherein the configuration of UL-TCI states is received through a radio resource control (RRC) signal and the activation is received through a medium access control (MAC) control element (CE) (MAC-CE).
4 . The method of claim 2 , wherein the QCL property comprises at least one of:
one or more port indications,
a Doppler shift,
a Doppler spread,
an average delay,
a delay spread,
a spatial Tx parameter, or
a spatial receive (Rx) parameter.
5 . The method of claim 2 , wherein the DCI includes one or more codepoint values indicating the one or more UL-TCI states of the activated UL-TCI states.
6 . The method of claim 5 , further comprising:
receiving a mapping between the activated UL-TCI states and a set of codepoint values, the one or more codepoint values being within the set of codepoint values.
7 . The method of claim 2 , wherein the first reference signal is further associated with a panel identifier (ID) of the UE.
8 . The method of claim 2 , wherein the first reference signal is one of SRS, or a downlink (DL) reference signal (RS).
9 . The method of claim 8 , wherein the DL RS is one of:
a channel state information (CSI) RS (CSI-RS),
a demodulation RS (DM-RS) for at least one of a physical downlink shared channel (PDSCH) or the PDCCH, or
a synchronization signal/physical broadcast channel (PBCH) (SS/PBCH) block.
10 . 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 configuration of uplink (UL) transmission configuration indicator (TCI) (UL-TCI) states that comprise configured UL-TCI states, wherein the configured UL-TCI states are initially deactivated upon the configuration;
receive an activation of a subset of the configured UL-TCI states, the subset of the configured UL-TCI states comprising activated UL-TCI states;
receive downlink control information (DCI) in a physical downlink control channel (PDCCH) scheduling a sounding reference signal (SRS) transmission with one or more UL-TCI states of the activated UL-TCI states; and
transmit the SRS transmission based on the one or more UL-TCI states, wherein transmitting the SRS transmission comprises transmitting the SRS transmission with a quasi-co location (QCL) property associated with the one or more UL-TCI states, and wherein each UL-TCI state in the configured UL-TCI states corresponds to a first reference signal associated with indicating a UL transmit (Tx) beam configuration for a UL channel or a UL reference signal.
11 . The apparatus of claim 10 , wherein the configuration of UL-TCI states is received through a radio resource control (RRC) signal and the activation is received a medium access control (MAC) control element (CE) (MAC-CE).
12 . The apparatus of claim 10 , wherein the QCL property comprises at least one of:
one or more port indications,
a Doppler shift,
a Doppler spread,
an average delay,
a delay spread,
a spatial Tx parameter, or
a spatial receive (Rx) parameter.
13 . The apparatus of claim 10 , wherein the DCI includes one or more codepoint values indicating the one or more UL-TCI states of the activated UL-TCI states.
14 . The apparatus of claim 13 , wherein the at least one processor is further configured to:
receive a mapping between the activated UL-TCI states and a set of codepoint values, wherein the one or more codepoint values are within the set of codepoint values.
15 . The apparatus of claim 10 , wherein the first reference signal is further associated with a panel identifier (ID) of the UE.
16 . The apparatus of claim 10 , further comprising:
at least one transceiver coupled to the at least one processor, wherein the first reference signal is one of SRS, or a downlink (DL) reference signal (RS).
17 . The apparatus of claim 16 , wherein the DL RS is one of:
a channel state information (CSI) RS (CSI-RS),
a demodulation RS (DM-RS) for at least one of a physical downlink shared channel (PDSCH) or the PDCCH, or
a synchronization signal/physical broadcast channel (PBCH) (SS/PBCH) block.
18 . A method of wireless communication at a base station (BS), comprising:
transmitting a configuration of uplink (UL) transmission configuration indicator (TCI) (UL-TCI) states that comprise configured UL-TCI states, wherein the configured UL-TCI states are initially deactivated upon the configuration;
transmitting an activation of a subset of the configured UL-TCI states, the subset of the configured UL-TCI states comprising activated UL-TCI states;
transmitting downlink control information (DCI) in a physical downlink control channel (PDCCH) scheduling a sounding reference signal (SRS) transmission with one or more UL-TCI states of the activated UL-TCI states;
receiving the SRS transmission based on the one or more UL-TCI states, wherein transmitting the SRS transmission comprises transmitting the SRS transmission with a quasi-co location (QCL) property associated with the one or more UL-TCI states, and wherein each UL-TCI state in the configured UL-TCI states corresponds to a first reference signal associated with indicating a UL transmit (Tx) beam configuration for a UL channel or a UL reference signal; and
demodulating the SRS transmission based on the one or more UL-TCI states.
19 . The method of claim 18 , wherein the configuration of UL-TCI states is transmitted through a radio resource control (RRC) signal and the activation is transmitted in a medium access control (MAC) control element (CE) (MAC-CE).
20 . The method of claim 18 , wherein the QCL property comprises at least one of:
one or more port indications,
a Doppler shift,
a Doppler spread,
an average delay,
a delay spread,
a spatial Tx parameter, or
a spatial receive (Rx) parameter.
21 . The method of claim 18 , wherein the DCI includes one or more codepoint values indicating the one or more UL-TCI states of the activated UL-TCI states.