Beam indications for multiple uplink or downlink channels and reference signals
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for a user equipment (UE) to receive a message including transmission configuration indicator (TCI) states information associated with beam information for uplink or downlink resources. The UE may identify multiple channels or reference signals, or both, to which a TCI state is to be applied based on associated indications included with the TCI state information. In some examples, the TCI state information may also include indications of source reference signals for quasi co-location (QCL) assumptions for the indicated channels or reference signals. Based on applying the TCI state, the UE may determine beam information for uplink or downlink resources and may communicate with the base station accordingly.
1 . A user equipment (UE) for wireless communication, comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and operable to execute the code to cause the UE to:
receive a message indicating one or more first transmission configuration indicator (TCI) states and one or more second TCI states, wherein the one or more second TCI states are different from the one or more first TCI states;
apply a TCI state to two or more channels, the TCI state corresponding to TCI state information for one of the one or more first TCI states or the one or more second TCI states, wherein the TCI state is associated with a timing advance parameter for uplink transmissions, and wherein the TCI state information comprises a first field indicating a set of power control parameters for the uplink transmissions, a second field indicating a timing advance group identity for the uplink transmissions, and a third field indicating quasi co-location information for the two or more channels;
determine a spatial filter based on the TCI state, the spatial filter corresponding to a first channel and a second channel of the two or more channels; and
communicate with a network device via the first channel and the second channel using the spatial filter and in accordance with the timing advance parameter and the timing advance group identity.
2 . The UE of claim 1 , wherein the one or more processors are operable to cause the UE to:
apply the set of power control parameters to an uplink transmission based at least in part on the TCI state.
3 . The UE of claim 1 , wherein the TCI state comprises an indication of a pathloss reference signal.
4 . The UE of claim 1 , wherein the one or more processors are operable to cause the UE to:
identify the TCI state based at least in part on an information field comprising a TCI state identity corresponding to the TCI state, wherein the information field is within the one or more first TCI states or within the one or more second TCI states.
5 . The UE of claim 1 , wherein the one or more processors are operable to cause the UE to:
determine common beam information based at least in part on applying the TCI state to the two or more channels, the common beam information comprising the spatial filter.
6 . The UE of claim 5 , wherein the first spatial filter corresponds to the first channel of the two or more channels and the second spatial filter corresponds to the second channel of the two or more channels.
7 . The UE of claim 1 , wherein the one or more first TCI states corresponds to one or more uplink TCI states and the one or more second TCI states correspond to one or more downlink TCI states.
8 . The UE of claim 1 , wherein the one or more processors are operable to cause the UE to:
determine that a same source reference signal is associated with quasi co-location assumptions for each of the two or more channels based at least in part on the TCI state, wherein the spatial filter comprises a common beam that corresponds to the same source reference signal; and
communicate with a base station via the two or more channels using the common beam.
9 . A user equipment (UE) for wireless communication, comprising:
one or more memories storing processor-executable code; and
one or more processors coupled with the one or more memories and operable to execute the code to cause the UE to:
receive a message indicating one or more first transmission configuration indicator (TCI) states and one or more second TCI states, wherein the one or more second TCI states are different from the one or more first TCI states;
apply a TCI state to two or more reference signals, the TCI state corresponding to TCI state information for one of the one or more first TCI states or the one or more second TCI states, wherein the TCI state is associated with a timing advance parameter for uplink transmissions, and wherein the TCI state information comprises a first field indicating a set of power control parameters for the uplink transmissions, a second field indicating a timing advance group identity for the uplink transmissions, and a third field indicating quasi co-location information for the two or more reference signals; and
determine one or more reference signals based on the quasi co-location information and the timing advance group identity, the one or more reference signals used for quasi co-location assumptions for a first reference signal of the two or more reference signals and a second reference signal of the two or more reference signals.
10 . The UE of claim 9 , wherein the one or more processors are operable to cause the UE to:
apply the set of power control parameters to an uplink transmission based at least in part on the TCI state.
11 . The UE of claim 10 , wherein the TCI state comprises an indication of a pathloss reference signal.
12 . The UE of claim 9 , wherein the one or more processors are operable to cause the UE to:
identify the TCI state based at least in part on an information field comprising a TCI state identity corresponding to the TCI state, wherein the information field is within the one or more first TCI states or within the one or more second TCI states.
13 . The UE of claim 9 , wherein the one or more processors are individually or collectively further operable to cause the UE to:
determine common beam information associated with the two or more reference signals based at least in part on the TCI state applied to the two or more reference signals, the common beam information comprising at least a first beam and a second beam.
14 . The UE of claim 13 , wherein the first beam corresponds to the first reference signal of the two or more reference signals and the second beam corresponds to the second reference signal of the two or more reference signals.
15 . The UE of claim 9 , wherein the one or more first TCI states corresponds to one or more uplink TCI states and the one or more second TCI states correspond to one or more downlink TCI states.
16 . The UE of claim 9 , wherein the one or more processors are operable to cause the UE to:
determine that a same source reference signal is associated with quasi co-location assumptions for each of the two or more reference signals based at least in part on the TCI state.
17 . A method for wireless communication by a user equipment (UE), comprising:
receiving a message indicating one or more first transmission configuration indicator (TCI) states and one or more second TCI states, wherein the one or more second TCI states are different from the one or more first TCI states;
applying a TCI state to two or more channels, the TCI state corresponding to TCI state information for one of the one or more first TCI states or the one or more second TCI states, wherein the TCI state is associated with a timing advance parameter for uplink transmissions, and wherein the TCI state indicates information comprises a first field indicating a set of power control parameters for the uplink transmissions, a second field indicating a timing advance group identity for the uplink transmission, and a third field indicating quasi co-location information for the two or more channels;
determining a spatial filter based on the TCI state, the spatial filter corresponding to a first channel and a second channel of the two or more channels; and
communicating with a network device via the first channel and the second channel using the spatial filter and in accordance with the timing advance parameter and the timing advance group identity.
18 . The method of claim 17 , further comprising:
applying the set of power control parameters to an uplink transmission based at least in part on the TCI state.
19 . The method of claim 17 , wherein the TCI state comprises an indication of a pathloss reference signal.
20 . The method of claim 17 , further comprising:
identifying the TCI state based at least in part on an information field comprising a TCI state identity corresponding to the TCI state, wherein the information field is within the one or more first TCI states or within the one or more second TCI states.