Power control design for non-orthogonal multiple access
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may determine at least one of a downlink path loss value or an uplink path loss value associated with a base station; receive system information, a semi-persistently configured grant via RRC or a dynamic uplink grant via DCI from the base station, wherein the RRC signaling or the dynamic uplink grant identifies a power control value associated with one user or a plurality of users associated with the base station; and determine a transmit power for a data or control transmission based at least in part on at least one of the downlink path loss value or the uplink path loss value and the power control value. Numerous other aspects are provided.
1. A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors, coupled to the one or more memories, configured to:
determine a transmit power for a MsgA transmission, wherein the MsgA transmission is a grant-free transmission and is associated with a random access procedure;
perform the MsgA transmission using non-orthogonal multiple access (NOMA) in accordance with the transmit power;
determine that the MsgA transmission has failed; and
perform a fallback to a grant-based transmission based at least in part on the MsgA transmission having failed.
2. The UE of claim 1 , wherein the grant-based transmission uses orthogonal multiple access in at least one of:
a time domain,
a frequency domain,
a code domain, or
a spatial domain.
3. The UE of claim 1 , wherein the grant-based transmission uses NOMA in at least one of:
a time domain,
a frequency domain,
a code domain, or
a spatial domain.
4. The UE of claim 1 , wherein the one or more processors, to determine the transmit power, are configured to:
determine the transmit power based at least in part on a NOMA-specific resource configuration for reference signals, data, and control information.
5. The UE of claim 4 , wherein the NOMA-specific resource configuration includes an indication of a reference signal resource index for determining the transmit power.
6. The UE of claim 1 , wherein the MsgA transmission comprises a random access preamble and a data or control channel, and
wherein the one or more processors, to determine the transmit power, are configured to:
determine the transmit power for the random access preamble.
7. The UE of claim 1 , wherein the one or more processors, to determine the transmit power for the MsgA transmission, are configured to:
determine the transmit power for the MsgA transmission based at least in part on a downlink path loss value of the UE.
8. The UE of claim 1 , wherein the one or more processors, to determine the transmit power for the MsgA transmission, are configured to:
determine the transmit power for the MsgA transmission based at least in part on a grant-free open-loop power control technique that is based at least in part on a UE group of the UE.
9. The UE of claim 8 , wherein the UE group of the UE is assigned based at least in part on a bandwidth of the UE; or
wherein the UE is associated with the UE group based at least in part on a modulation order or a code rate of the UE.
10. The UE of claim 8 , wherein the one or more processors, to perform the fallback to the grant-based transmission at least in part on the MsgA transmission having failed, are configured to:
perform the fallback to the grant-based transmission based at least in part on a set quantity of repetitions of the MsgA transmission having failed.
11. A method of wireless communication performed by a user equipment (UE), comprising:
determining a transmit power for a MsgA transmission, wherein the MsgA transmission is a grant-free transmission and is associated with a random access procedure;
performing the MsgA transmission using non-orthogonal multiple access (NOMA) in accordance with the transmit power;
determining that the MsgA transmission has failed; and
performing a fallback to a grant-based transmission based at least in part on the MsgA transmission having failed.
12. The method of claim 11 , wherein the grant-based transmission uses orthogonal multiple access in at least one of:
a time domain,
a frequency domain,
a code domain, or
a spatial domain.
13. The method of claim 11 , wherein the grant-based transmission uses NOMA in at least one of:
a time domain,
a frequency domain,
a code domain, or
a spatial domain.
14. The method of claim 11 , wherein determining the transmit power is based at least in part on a NOMA-specific resource configuration for reference signals, data, and control information.
15. The method of claim 14 , wherein the NOMA-specific resource configuration includes an indication of a reference signal resource index for determining the transmit power.
16. The method of claim 15 , wherein the MsgA transmission comprises a random access preamble and a data or control channel associated with respective transmit powers, and wherein determining the transmit power for the random access preamble and for the data or control channel is based at least in part on the NOMA-specific resource configuration.
17. The method of claim 11 , wherein determining the transmit power for the MsgA transmission is based at least in part on a downlink path loss value of the UE.
18. The method of claim 11 , wherein determining the transmit power for the MsgA transmission is based at least in part on a grant-free open-loop power control technique that is based at least in part on a UE group of the UE.
19. The method of claim 18 , wherein the UE group of the UE is assigned based at least in part on a bandwidth of the UE.
20. The method of claim 18 , wherein the UE is associated with the UE group based at least in part on a modulation order or a code rate of the UE.
21. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the UE to:
determine a transmit power for a MsgA transmission, wherein the MsgA transmission is a grant-free transmission and is associated with a random access procedure;
perform the MsgA transmission using non-orthogonal multiple access (NOMA) in accordance with the transmit power;
determine that the MsgA transmission has failed; and
perform a fallback to a grant-based transmission based at least in part on the MsgA transmission having failed.
22. The non-transitory computer-readable medium of claim 21 , wherein the grant-based transmission uses orthogonal multiple access in at least one of:
a time domain,
a frequency domain,
a code domain, or
a spatial domain.
23. The non-transitory computer-readable medium of claim 21 , wherein the grant-based transmission uses NOMA in at least one of:
a time domain,
a frequency domain,
a code domain, or
a spatial domain.
24. The non-transitory computer-readable medium of claim 21 , wherein the one or more instructions, that cause the UE to determine the transmit power, cause the UE to:
determine the transmit power based at least in part on a NOMA-specific resource configuration for reference signals, data, and control information.
25. The non-transitory computer-readable medium of claim 24 , wherein the NOMA-specific resource configuration includes an indication of a reference signal resource index for determining the transmit power.
26. The non-transitory computer-readable medium of claim 25 , wherein the MsgA transmission comprises a random access preamble and a data or control channel associated with respective transmit powers, and
wherein the one or more instructions, that cause the UE to determine the transmit power for the random access preamble and for the data or control channel, cause the UE to:
determine the transmit power for the random access preamble and for the data or control channel based at least in part on the NOMA-specific resource configuration.
27. The non-transitory computer-readable medium of claim 21 , wherein the one or more instructions, that cause the UE to determine the transmit power for the MsgA transmission, cause the UE to:
determine the transmit power for the MsgA transmission based at least in part on a downlink path loss value of the UE.
28. The non-transitory computer-readable medium of claim 21 , wherein the one or more instructions, that cause the UE to determine the transmit power for the MsgA transmission, cause the UE to:
determine the transmit power for the MsgA transmission based at least in part on a grant-free open-loop power control technique that is based at least in part on a UE group of the UE.
29. The non-transitory computer-readable medium of claim 28 , wherein the UE group of the UE is assigned based at least in part on a bandwidth of the UE.
30. An apparatus for wireless communication, comprising:
means for determining a transmit power for a MsgA transmission, wherein the MsgA transmission is a grant-free transmission and is associated with a random access procedure;
means for performing the MsgA transmission using non-orthogonal multiple access (NOMA) in accordance with the transmit power;
means for determining that the MsgA transmission has failed; and
means for performing a fallback to a grant-based transmission based at least in part on the MsgA transmission having failed.