Uplink transmission configuration indication state signaling
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a base station, radio resource control signaling configuring an uplink transmission configuration indication (TCI) state pool that includes multiple candidate uplink TCI states associated with an uplink resource. The base station may transmit, and the UE may receive, downlink signaling that identifies, among the multiple candidate uplink TCI states included in the uplink TCI state pool, an uplink TCI state to be used to transmit an uplink communication on the uplink resource. Accordingly, the UE may transmit, to the base station, the uplink communication on the uplink resource using an uplink transmit beam based at least in part on the uplink TCI state identified in the downlink signaling. Numerous other aspects are provided.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network entity, radio resource control signaling configuring an uplink transmission configuration indication (TCI) state pool that includes multiple candidate uplink TCI states associated with an uplink resource;
receiving, from the network entity, downlink signaling, comprising a medium access control (MAC) control element (MAC-CE), that selects, among the multiple candidate uplink TCI states included in the uplink TCI state pool, one or more uplink TCI states to be used to transmit an uplink communication on the uplink resource; and
transmitting, to the network entity, the uplink communication on the uplink resource using an uplink transmit beam based at least in part on the one or more uplink TCI states selected in the downlink signaling.
2 . The method of claim 1 , wherein the MAC-CE includes a structure including a first field for a serving cell ID, a second field for a bandwidth part ID, and one or more third fields,
wherein the one or more third fields of the MAC CE indicate that the MAC CE is to select the one or more uplink TCI states,
wherein the downlink signaling further comprises downlink control information (DCI) indicating the uplink TCI state to be used to transmit the uplink communication on the uplink resource among the one or more uplink TCI states selected by the MAC-CE; and
wherein the DCI includes a bit sequence to indicate the uplink TCI state to be used to transmit the uplink communication.
3 . The method of claim 1 , wherein the one or more uplink TCI states comprise a subset of the multiple candidate uplink TCI states in the uplink TCI state pool.
4 . The method of claim 3 , further comprising:
receiving downlink control information (DCI) indicating an uplink TCI state, among the one or more uplink TCI states selected by the MAC-CE, to be used to transmit the uplink communication on the uplink resource.
5 . The method of claim 4 , wherein the DCI further indicates that the uplink TCI state is to be applied to one or more of a physical downlink control channel, a physical downlink shared channel, or a channel state information reference signal.
6 . The method of claim 4 , wherein the DCI includes a bit sequence to indicate the uplink TCI state to be used to transmit the uplink communication.
7 . The method of claim 3 , wherein the MAC-CE includes one or more bits to indicate that the MAC-CE is to select the subset of the multiple candidate uplink TCI states to be used to transmit the uplink communication.
8 . The method of claim 1 , wherein the uplink TCI state pool is associated with one or more of a bandwidth part, a component carrier, or the UE.
9 . The method of claim 1 , wherein the uplink resource includes a set of uplink resources associated with one or more of a physical random access channel, a physical uplink control channel, a physical uplink shared channel, or a sounding reference signal.
10 . The method of claim 1 , wherein the uplink resource includes one or more of a physical random access channel resource, a physical uplink control channel resource, a physical uplink shared channel resource, or a sounding reference signal resource.
11 . A method of wireless communication performed by a network entity, comprising:
transmitting, to a user equipment (UE), radio resource control signaling configuring an uplink transmission configuration indication (TCI) state pool that includes multiple candidate uplink TCI states associated with an uplink resource;
transmitting, to the UE, downlink signaling, comprising a medium access control (MAC) control element (MAC-CE), that selects, among the multiple candidate uplink TCI states included in the uplink TCI state pool, one or more uplink TCI states to be used to transmit an uplink communication on the uplink resource; and
receiving, from the UE, the uplink communication on the uplink resource using an uplink receive beam corresponding to an uplink transmit beam associated with the one or more uplink TCI states selected in the downlink signaling.
12 . The method of claim 11 , wherein the uplink resource includes one or more of a physical random access channel resource, a physical uplink control channel resource, a physical uplink shared channel resource, or a sounding reference signal resource.
13 . The method of claim 11 , wherein the one or more uplink TCI states comprise a subset of the multiple candidate uplink TCI states in the uplink TCI state pool.
14 . The method of claim 13 , wherein further comprising:
transmitting downlink control information (DCI) indicating an uplink TCI state, among the one or more uplink TCI states selected by the MAC-CE, to be used to transmit the uplink communication on the uplink resource.
15 . The method of claim 14 , wherein the DCI further indicates that the uplink TCI state is to be applied to one or more of a physical downlink control channel, a physical downlink shared channel, or a channel state information reference signal.
16 . The method of claim 14 , wherein the DCI includes a bit sequence to indicate the uplink TCI state to be used to transmit the uplink communication.
17 . The method of claim 13 , wherein the MAC-CE includes one or more bits to indicate that the MAC-CE is to select the subset of the multiple candidate uplink TCI states to be used to transmit the uplink communication.
18 . The method of claim 11 , wherein the uplink TCI state pool is associated with one or more of a bandwidth part, a component carrier, or the UE.
19 . The method of claim 11 , wherein the uplink resource includes a set of uplink resources associated with one or more of a physical random access channel, a physical uplink control channel, a physical uplink shared channel, or a sounding reference signal.
20 . A user equipment (UE) for wireless communication, comprising:
one or more memories comprising processor-executable instructions; and
one or more processors configured to execute the processor-executable instructions and cause the UE to:
receive, from a network entity, radio resource control signaling configuring an uplink transmission configuration indication (TCI) state pool that includes multiple candidate uplink TCI states associated with an uplink resource;
receive, from the network entity, downlink signaling, comprising a medium access control (MAC) control element (MAC-CE), that selects, among the multiple candidate uplink TCI states included in the uplink TCI state pool, one or more uplink TCI states to be used to transmit an uplink communication on the uplink resource; and
transmit, to the network entity, the uplink communication on the uplink resource using an uplink transmit beam based at least in part on the one or more uplink TCI states selected in the downlink signaling.
21 . The UE of claim 20 , wherein the one or more uplink TCI states comprise a subset of the multiple candidate uplink TCI states in the uplink TCI state pool.
22 . The UE of claim 21 , wherein the one or more processors are further configured to cause the UE to:
receive downlink control information (DCI) indicating an uplink TCI state, among the one or more uplink TCI states selected by the MAC-CE, to be used to transmit the uplink communication on the uplink resource.
23 . The UE of claim 22 , wherein the DCI includes a bit sequence to indicate the uplink TCI state to be used to transmit the uplink communication.
24 . The UE of claim 20 , wherein the uplink TCI state pool is associated with one or more of a bandwidth part, a component carrier, or the UE.
25 . The UE of claim 20 , wherein the MAC-CE includes a structure including a first field for a serving cell ID, a second field for a bandwidth part ID, and one or more third fields,
wherein the one or more third fields of the MAC CE indicate that the MAC CE is to select the one or more uplink TCI states,
wherein the downlink signaling further comprises downlink control information (DCI) indicating the uplink TCI state to be used to transmit the uplink communication on the uplink resource among the one or more uplink TCI states selected by the MAC-CE; and
wherein the DCI includes a bit sequence to indicate the uplink TCI state to be used to transmit the uplink communication.