Waveform indication for PUCCH
Aspects of the disclosure provide techniques for waveform indication for physical uplink control channel (PUCCH) transmissions. A network entity may provide an indication of a waveform type, such as CP-OFDM, DFT-s-OFDM, or other suitable waveform type, for a PUCCH format to a user equipment (UE). The UE may then communicate a PUCCH with the network entity using the waveform type for the PUCCH format.
1. A network entity configured for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors being configured to:
provide an indication of a waveform type for a first format of a physical uplink control channel (PUCCH) to a user equipment (UE) based on a capability of the UE; and
communicate the PUCCH using the waveform type for the first format.
2. The network entity of claim 1 , wherein the waveform type comprises cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) or discrete Fourier transform-spread-OFDM (DFT-s-OFDM).
3. The network entity of claim 1 , wherein the first format comprises PUCCH format 2.
4. The network entity of claim 1 , wherein the first format comprises PUCCH format 2 or a different short PUCCH format with more than two bits, and wherein the waveform type associated with the PUCCH format 2 comprises CP-OFDM and the waveform type associated with the different short PUCCH format comprises DFT-s-OFDM.
5. The network entity of claim 1 , wherein the indication indicates at least one parameter associated with the waveform type.
6. The network entity of claim 1 , wherein the indication comprises a semi-static indication and wherein the one or more processors are further configured to:
provide a radio resource control (RRC) configuration of the waveform type for the first format of the PUCCH.
7. The network entity of claim 1 , wherein the indication comprises a dynamic indication and wherein the one or more processors are configured to:
provide a PUCCH resource configuration indicating a respective waveform configuration for each of a plurality of PUCCH resources.
8. The network entity of claim 7 , wherein the one or more processors are further configured to:
provide a PUCCH resource indicator (PRI) within downlink control information (DCI), the PRI indicating a PUCCH resource of the plurality of PUCCH resources for the PUCCH, the PRI further indicating the waveform type for the first format of the PUCCH based on the PUCCH resource.
9. The network entity of claim 8 , wherein the one or more processors are further configured to:
receive the PUCCH comprising acknowledgement information for a scheduled physical downlink shared channel (PDSCH).
10. The network entity of claim 8 , wherein the one or more processors are further configured to:
receive the PUCCH comprising acknowledgement information for a semi-persistently scheduled (SPS) PDSCH based on an activating DCI activating an SPS configuration for the SPS PDSCH.
11. The network entity of claim 1 , wherein the one or more processors are further configured to:
identify the waveform type from at least two waveform types; and
identify a number of symbols of the PUCCH for the waveform type.
12. The network entity of claim 11 , wherein the one or more processors are further configured to:
provide a PUCCH resource configuration indicating a respective waveform configuration for each of a plurality of PUCCH resources, the respective waveform configuration for each of the plurality of PUCCH resources indicating one of the at least two waveform types and a respective number of symbols associated with the respective waveform configuration; and
provide a PUCCH resource indicator (PRI) within downlink control information (DCI), the PRI indicating a PUCCH resource of the plurality of PUCCH resources for the PUCCH, the PRI indicating the waveform type for the first format of the PUCCH and the respective number of symbols of the PUCCH based on the PUCCH resource.
13. The network entity of claim 11 , wherein the one or more processors are further configured to:
identify the number of symbols of the PUCCH for the waveform type based on the first format of the PUCCH.
14. The network entity of claim 11 , wherein the one or more processors are further configured to:
switch from a first waveform type having a first number of symbols to a second waveform type having a second number of symbols different than the first number of symbols for the first format of the PUCCH.
15. The network entity of claim 14 , wherein the second number of symbols is greater than the first number of symbols and wherein a first overhead of demodulation reference signals (DMRSs) for the first number of symbols is greater than a second overhead of DMRSs for the second number of symbols.
16. The network entity of claim 1 , wherein the one or more processors are further configured to:
provide a semi-persistent command for waveform switching from a first waveform type to a second waveform type for the PUCCH.
17. The network entity of claim 16 , wherein the first waveform type is associated with a second format of the PUCCH having a same length range as the first format.
18. The network entity of claim 16 , wherein the one or more processors are further configured to:
provide the semi-persistent command for waveform switching via one of downlink control information (DCI) or a medium access control (MAC) control element (MAC-CE).
19. The network entity of claim 1 , wherein the capability of the UE is based on at least one of a frequency range, a frequency band, a band combination, or a bandwidth part (BWP) of the PUCCH.
20. A method for wireless communication at a network entity, the method comprising:
providing an indication of a waveform type for a first format of a physical uplink control channel (PUCCH) to a user equipment (UE) based on a capability of the UE; and
communicating the PUCCH using the waveform type for the first format.
21. The method of claim 20 , wherein the indication comprises a semi-static indication, and wherein the providing the indication of the waveform type further comprises:
providing a radio resource control (RRC) configuration of the waveform type for the first format of the PUCCH.
22. The method of claim 20 , wherein the indication comprises a dynamic indication, and wherein the providing the indication of the waveform type for the first format of the PUCCH further comprises:
providing a PUCCH resource configuration indicating a respective waveform configuration for each of a plurality of PUCCH resources; and
providing a PUCCH resource indicator (PRI) within downlink control information (DCI), the PRI indicating a PUCCH resource of the plurality of PUCCH resources for the PUCCH, the PRI further indicating the waveform type for the first format of the PUCCH based on the PUCCH resource.
23. The method of claim 20 , wherein the providing the indication of the waveform type for the first format of the PUCCH further comprises:
providing a semi-persistent command for waveform switching from a first waveform type to a second waveform type for the PUCCH.
24. A user equipment configured for wireless communication, comprising:
one or more transceivers configured to communicate with a network entity;
one or more memories; and
one or more processors coupled to the one or more transceivers and the one or more memories, the one or more processors being configured to:
receive an indication of a waveform type for a first format of a physical uplink control channel (PUCCH) based on a capability of the UE; and
communicate the PUCCH using the waveform type for the first format.
25. The user equipment of claim 24 , wherein the indication comprises a semi-static indication, and wherein the one or more processors are further configured to:
receive a radio resource control (RRC) configuration of the waveform type for the first format of the PUCCH.
26. The user equipment of claim 24 , wherein the indication comprises a dynamic indication, and wherein the one or more processors are configured to:
receive a PUCCH resource configuration indicating a respective waveform configuration for each of a plurality of PUCCH resources; and
receive a PUCCH resource indicator (PRI) within downlink control information (DCI), the PRI indicating a PUCCH resource of the plurality of PUCCH resources for the PUCCH, the PRI further indicating the waveform type for the first format of the PUCCH based on the PUCCH resource.
27. The user equipment of claim 24 , wherein the one or more processors are further configured to:
provide a semi-persistent command for waveform switching from a first waveform type to a second waveform type for the PUCCH.
28. A method for wireless communication at a user equipment, the method comprising:
receiving an indication of a waveform type for a first format of a physical uplink control channel (PUCCH) based on a capability of the UE; and
communicating the PUCCH using the waveform type for the first format.
29. The method of claim 28 , wherein the indication comprises a semi-static indication, a dynamic indication, or a semi-persistent command for waveform switching.