Power and spectral efficiency based on adding odd order modulations
Aspects are provided which allow for a network entity such as a base station to configure odd modulation orders to be applied to downlink or uplink transmissions via signaling between the network entity and the UE. Initially, the network entity transmits a configuration to the UE indicating network support for communications using odd order modulation. Afterwards, the UE transmits, and the network entity receives, data in a signal using the odd order modulation. As a result, improved SPEF, PAPR reduction, and phase noise mitigation associated with odd order modulations may be realized through application of odd order modulations to data transmissions or receptions based on network support being configured for such odd order modulations.
1. An apparatus for wireless communication, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive a configuration indicating network support for communications using odd order modulation;
transmit to a network entity, in response to the configuration, a request to change a current modulation and coding scheme (MCS) applied to communication between the apparatus and the network entity from a first MCS in a first MCS table to a second MCS in a second MCS table, the apparatus being a user equipment (UE), the first MCS table and the second MCS table respectively including a plurality of MCSs associated with MCS indices, each of the plurality of MCSs including a modulation order and a code rate, the first MCS table including even order modulations and lacking odd order modulations, and the second MCS table including the odd order modulations; and
transmit data in a signal using the second MCS, the second MCS including one of the odd order modulations.
2. The apparatus of claim 1 , wherein the one of the odd order modulations is associated with a non-square quadrature amplitude modulation (QAM) constellation or a non-square amplitude and phase-shift keying (APSK) constellation.
3. The apparatus of claim 1 , wherein the data is transmitted in a single-carrier frequency division multiple access (SC-FDMA) waveform, a Discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform, or a Nyquist pulse shaped single carrier waveform.
4. The apparatus of claim 1 , wherein the configuration is a radio resource control (RRC) configuration or a medium access control (MAC) control element (MAC-CE).
5. The apparatus of claim 1 , wherein the request is transmitted in a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH).
6. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further cause the apparatus to transmit the request in response to a signal to noise ratio (SNR) of the configuration being at least equal to a phase noise SNR threshold.
7. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further cause the apparatus to transmit the request in response to a signal to noise ratio (SNR) of the configuration being at most equal to a cell edge SNR threshold.
8. The apparatus of claim 1 , wherein the request is included in a channel state information (CSI) report.
9. The apparatus of claim 1 , wherein the second MCS table further includes a portion of the even order modulations of the first MCS table.
10. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a message inquiring whether the apparatus includes odd order modulation support; and
transmit, in response to the message, an acknowledgment indicating the odd order modulation support;
wherein the signal uses the one of the odd order modulations the odd order modulation based on the odd order modulation support.
11. The apparatus of claim 10 , wherein the message is received in a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).
12. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further cause the apparatus to:
transmit a channel state information (CSI) report indicating the one of the odd order modulations; and
receive, in response to the CSI report, downlink control information (DCI) scheduling transmission of the data in the signal using the one of the odd order modulations.
13. An apparatus for wireless communication, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
transmit a configuration indicating network support for communications using odd order modulation;
receive from a user equipment (UE), in response to the configuration, a request to change a current modulation and coding scheme (MCS) applied to communication between the apparatus and the UE from a first MCS in a first MCS table to a second MCS in a second MCS table, the apparatus being a network entity, the first MCS table and the second MCS table respectively including a plurality of MCSs associated with MCS indices, each of the plurality of MCSs including a modulation order and a code rate, the first MCS table including even order modulations and lacking odd order modulations, and the second MCS table including the odd order modulations; and
receive data in a signal using the second MCS, the second MCS including one of the odd order modulations.
14. The apparatus of claim 13 , wherein the one of the odd order modulations is associated with a non-square quadrature amplitude modulation (QAM) constellation or a non-square amplitude and phase-shift keying (APSK) constellation.
15. The apparatus of claim 13 , wherein the data is received in a single-carrier frequency division multiple access (SC-FDMA) waveform, a Discrete Fourier transform-spread orthogonal frequency-division multiplexing (DFT-s-OFDM) waveform, or a Nyquist pulse shaped single carrier waveform.
16. The apparatus of claim 13 , wherein the configuration is a radio resource control (RRC) configuration or a medium access control (MAC) control element (MAC-CE).
17. The apparatus of claim 13 , wherein the request is received in a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH).
18. The apparatus of claim 13 , wherein the instructions, when executed by the processor, further cause the apparatus to receive the request in response to a signal to noise ratio (SNR) of the configuration being at least equal to a phase noise SNR threshold.
19. The apparatus of claim 13 , wherein the instructions, when executed by the processor, further cause the apparatus to receive the request in response to a signal to noise ratio (SNR) of the configuration being at most equal to a cell edge SNR threshold.
20. The apparatus of claim 13 , wherein the request is included in a channel state information (CSI) report.
21. The apparatus of claim 13 , wherein the second MCS table further includes a portion of the even order modulations of the first MCS table.
22. The apparatus of claim 13 , wherein the instructions, when executed by the processor, further cause the apparatus to:
transmit a message inquiring whether the UE includes odd order modulation support; and
receive, in response to the message, an acknowledgment from the UE indicating the odd order modulation support;
wherein the signal uses the one of the odd order modulations based on the odd order modulation support.
23. The apparatus of claim 22 , wherein the message is transmitted in a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).
24. The apparatus of claim 13 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a channel state information (CSI) report indicating the one of the odd order modulations; and
transmit, in response to the CSI report, downlink control information (DCI) scheduling transmission of the data in the signal using the one of the odd order modulations.
25. A method of wireless communication at a user equipment (UE), comprising:
receiving a configuration indicating network support for communications using odd order modulation;
transmitting to a network entity, in response to the configuration, a request to change a current modulation and coding scheme (MCS) applied to communication between the UE and the network entity from a first MCS in a first MCS table to a second MCS in a second MCS table, the first MCS table and the second MCS table respectively including a plurality of MCSs associated with MCS indices, each of the plurality of MCSs including a modulation order and a code rate, the first MCS table including even order modulations and lacking odd order modulations, and the second MCS table including the odd order modulations; and
transmitting data in a signal using the second MCS, the second MCS including one of the odd order modulations.
26. The method of claim 25 , wherein the second MCS table further includes a portion of the even order modulations of the first MCS table.
27. A method of wireless communication at a network entity, comprising:
transmitting a configuration indicating network support for communications using odd order modulation;
receiving from a user equipment (UE), in response to the configuration, a request to change a current modulation and coding scheme (MCS) applied to communication between the network entity and the UE from a first MCS in a first MCS table to a second MCS in a second MCS table, the first MCS table and the second MCS table respectively including a plurality of MCSs associated with MCS indices, each of the plurality of MCSs including a modulation order and a code rate, the first MCS table including even order modulations and lacking odd order modulations, and the second MCS table including the odd order modulations; and
receiving data in a signal using the second MCS, the second MCS including one of the odd order modulations.
28. The method of claim 27 , wherein the second MCS table further includes a portion of the even order modulations of the first MCS table.