Uplink beam assignment

A method for wireless communication at a network device, comprising:

• allocating physical uplink control channel (PUCCH) communication resources for a user equipment (UE), wherein allocating the PUCCH communication resources for the UE comprises transmitting a semi-static configuration or a dynamic configuration allocating the PUCCH communication resources, which are designated for carrying a first uplink transmission from the UE to the network device using a first uplink transmit beam;
• identifying a PUCCH resource from a plurality of candidate PUCCH resources based at least in part on the identified PUCCH resource having a lowest index of the plurality of candidate PUCCH resources, wherein the first uplink transmission comprises a PUCCH transmission and the allocated PUCCH communication resources comprise the identified PUCCH resource;
• identifying a triggering condition that indicates to the UE to use a default transmit beam for communicating via a physical uplink shared channel (PUSCH) with the network device, wherein the default transmit beam is based at least in part on the allocated PUCCH communication resources;
• and
• receiving, based at least in part on the triggering condition, an uplink communication from the UE via the PUSCH, wherein the uplink communication is transmitted by the UE using the default transmit beam, wherein the uplink communication is transmitted by the UE using the default transmit beam based at least in part on the first uplink transmit beam being carried on the identified PUCCH resource having the lowest index.

An apparatus for wireless communications, comprising:

• a processor,
• memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor, to cause the apparatus to:
• determine, based at least in part on physical uplink control channel (PUCCH) communication resources allocated by a network device, a default transmit beam for communicating via a physical uplink shared channel (PUSCH) with the network device, wherein the instructions to determine the default transmit beam are executable by the processor to cause the apparatus to:
• receive a semi-static configuration or a dynamic configuration for the allocated PUCCH communication resources, wherein the allocated PUCCH communication resources are designated for carrying a first uplink transmission to the network device using a first uplink transmit beam, wherein the first uplink transmission comprises a PUCCH transmission and the allocated PUCCH communication resources comprise a PUCCH resource;
• identify the PUCCH resource from a plurality of PUCCH resources based at least in part on the identified PUCCH resource having a lowest index of the plurality of PUCCH resources;
• and
• determine the default transmit beam based at least in part on the first uplink transmit beam being carried on the identified PUCCH resource having the lowest index;
• identify a triggering condition for using the default transmit beam;
• and
• transmit, via the PUSCH, an uplink communication to the network device using the default transmit beam based at least in part on the triggering condition.

An apparatus for wireless communications at a network device, comprising:

• a processor, memory coupled with the processor;
• and
• instructions stored in the memory and executable by the processor, to cause the apparatus to:
• allocate physical uplink control channel (PUCCH) communication resources for a user equipment (UE), wherein allocating the PUCCH communication resources for the UE comprises transmitting a semi-static configuration or a dynamic configuration allocating the PUCCH communication resources, which are designated for carrying a first uplink transmission from the UE to the network device using a first uplink transmit beam;
• identify a PUCCH resource from a plurality of candidate PUCCH resources based at least in part on the identified PUCCH resource having a lowest index of the plurality of candidate PUCCH resources, wherein the first uplink transmission comprises a PUCCH transmission and the allocated PUCCH communication resources comprise the identified PUCCH resource;
• identify a triggering condition that indicates to the UE to use a default transmit beam for communicating via a physical uplink shared channel (PUSCH) with the network device, wherein the default transmit beam is based at least in part on the allocated PUCCH communication resources;
• and
• receive, based at least in part on the triggering condition, an uplink communication from the UE via the PUSCH, wherein the uplink communication is transmitted by the UE using the default transmit beam;
• wherein the uplink communication is transmitted by the UE using the default transmit beam based at least in part on the first uplink transmit beam being carried on the identified PUCCH resource having the lowest index.