Physical uplink control channel (pucch) resource allocation

A method for wireless communications by a user equipment, comprising:

• receiving, from a base station, an uplink grant comprising one or more downlink assignment index (DAI) bits;
• determining a number of bits to use to transmit an acknowledgement (ACK) based on the DAI bits;
• and
• transmitting, to the base station, the ACK using the determined number of bits.

A method for wireless communications by a network entity, comprising:

• transmitting downlink control information (DCI) comprising one or more resource indicator (RI) bits configured to indicate to a user equipment a subset of resources available for transmitting uplink control information (UCI) in a physical uplink control channel (PUCCH) transmission, wherein the DCI is transmitted on one or more resources of a first physical downlink control channel (PDCCH) transmission;
• identifying resources within the subset indicated by the RI bits to monitor for the UCI based on an implicit mapping of PDCCH resources to PUCCH resources and the one or more resources of the first PDCCH transmission;
• and
• monitoring the identified resources for the UCI.

A user equipment comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to:
• receive downlink control information (DCI) comprising one or more resource indicator (RI) bits configured to indicate to the user equipment a subset of resources available for transmitting uplink control information (UCI) in a physical uplink control channel (PUCCH) transmission, wherein the DCI is received on one or more resources of a first physical downlink control channel (PDCCH) transmission;
• identify resources within the subset indicated by the RI bits to transmit the UCI based on an implicit mapping of PDCCH resources to PUCCH resources and the one or more resources of the first PDCCH transmission;
• and
• transmit the UCI using the identified resources.

A user equipment comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to:
• receive, from a base station, an uplink grant comprising one or more downlink assignment index (DAI) bits;
• determine a number of bits to use to transmit an acknowledgement (ACK) based on the DAI bits;
• and
• transmit, to the base station, the ACK using the determined number of bits.

A network entity comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to:
• transmit downlink control information (DCI) comprising one or more resource indicator (RI) bits configured to indicate to a user equipment a subset of resources available for transmitting uplink control information (UCI) in a physical uplink control channel (PUCCH) transmission, wherein the DCI is transmitted on one or more resources of a first physical downlink control channel (PDCCH) transmission;
• identify resources within the subset indicated by the RI bits to monitor for the UCI based on an implicit mapping of PDCCH resources to PUCCH resources and the one or more resources of the first PDCCH transmission;
• and
• monitor the identified resources for the UCI.

A network entity comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to:
• transmit, to a user equipment, an uplink grant comprising one or more downlink assignment index (DAI) bits indicating a number of bits for the user equipment to use to transmit an acknowledgement (ACK) based on the DAI bits;
• and
• receive, from the user equipment, the ACK using the number of bits.