Physical Downlink Control Channel Design For DFT-S-OFDM Waveform

1. A method of operating a base station (BS), the method comprising:

generating, by the BS, one or more physical downlink control channels (PDCCH) in a time division multiplexing (TDM) manner using a Discrete Fourier Transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform;

generating, by the BS, a demodulation reference signal (DMRS) which is multiplexed in the TDM manner with the one or more PDCCH;

transmitting, by the BS, the one or more PDCCH and the DMRS to a user equipment;

generating, by the BS, a Discrete Fourier Transform (DFT) size for the transmission of the one or more PDCCH;

applying, by the BS, the DFT size to multiple instances of the transmission of the one or more PDCCH; and

wherein the DFT size equals a control resource set (CORESET) size in a frequency domain.

2. The method of claim 1 , further comprising inserting, by the BS, the DMRS before the one or more PDCCH prior to transmitting to the UE.

3. The method of claim 1 , further comprising multiplexing, by the BS, the one or more PDCCH in the TDM manner prior to performing a discrete Fourier transform (DFT) to generate the DFT-s-OFDM waveform.

4. The method of claim 1 , wherein the DMRS is a wideband DMRS and spans the whole CORESET in frequency.

5. The method of claim 1 , further comprising applying, by the BS, a time first mapping for a control channel element-to-resource element group (CCE-to-REG) mapping to the PDCCH in a time domain prior to performing a discrete Fourier transform (DFT) to generate the DFT-s-OFDM waveform.

6. The method of claim 1 , wherein when there is more than one PDCCH, generating, by the BS, a same DFT size for each PDCCH of the one or more PDCCH.

7. The method of claim 1 , wherein the DFT size is configured by higher layers via New Radio (NR) minimum system information (MSI), NR remaining minimum system information (RMSI), NR other system information (OSI), or radio resource control (RRC) signaling.

8. A non-transitory computer readable medium having instructions stored thereon that, when executed by one or more processors of a base station (BS), cause the BS to perform operations comprising:

generating one or more physical downlink control channels (PDCCH) in a time division multiplexing (TDM) manner using a Discrete Fourier Transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform;

generating a demodulation reference signal (DMRS) which is multiplexed in the TDM manner with the one or more PDCCH;

transmitting the one or more PDCCH and the DMRS to a user equipment (UE);

generating a Discrete Fourier Transform (DFT) size for the transmission of the one or more PDCCH;

applying the DFT size to multiple instances of the transmission of the one or more PDCCH; and

wherein the DFT size equals a control resource set (CORESET) size in a frequency domain.

9. The non-transitory computer readable medium of claim 8 , wherein the operations further comprise inserting the DMRS before the one or more PDCCH prior to transmitting to the UE.

10. The non-transitory computer readable medium of claim 8 , wherein the operations further comprise multiplexing the one or more PDCCH in the TDM manner prior to performing a discrete Fourier transform (DFT) to generate the DFT-s-OFDM waveform.

11. The non-transitory computer readable medium of claim 8 , wherein the DMRS is a wideband DMRS and spans the whole CORESET in frequency.

12. The non-transitory computer readable medium of claim 8 , wherein the operations further comprise applying a time first mapping for a control channel element-to-resource element group (CCE-to-REG) mapping to the PDCCH in a time domain prior to performing a discrete Fourier transform (DFT) to generate the DFT-s-OFDM waveform.

13. The non-transitory computer readable medium of claim 8 , wherein when there is more than one PDCCH, the operations further comprise generating a same DFT size for each PDCCH of the one or more PDCCH.

14. The non-transitory computer readable medium of claim 8 , wherein the DFT size is configured by higher layers via New Radio (NR) minimum system information (MSI), NR remaining minimum system information (RMSI), NR other system information (OSI), or radio resource control (RRC) signaling.

15. A base station (BS), comprising:

a processor configured to:

generate one or more physical downlink control channels (PDCCH) in a time division multiplexing (TDM) manner using a Discrete Fourier Transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform;

generate a demodulation reference signal (DMRS) which is multiplexed in the TDM manner with the one or more PDCCH;

generate a Discrete Fourier Transform (DFT) size for the transmission of the one or more PDCCH;

apply the DFT size to multiple instances of the transmission of the one or more PDCCH;

wherein the DFT size equals a control resource set (CORESET) size in a frequency domain; and

a radio frequency integrated circuit, coupled to the processor, configured to transmit the one or more PDCCH and the DMRS to a user equipment (UE).

16. The BS of claim 15 , wherein the processor is further configured to insert the DMRS before the one or more PDCCH prior to transmitting to the UE.

17. The BS of claim 15 , wherein the processor is further configured to multiplex the one or more PDCCH in the TDM manner prior to performing a discrete Fourier transform (DFT) to generate the DFT-s-OFDM waveform.

18. The BS of claim 15 , wherein the DMRS is a wideband DMRS and spans the whole CORESET in frequency.

19. The BS of claim 15 , wherein when there is more than one PDCCH, the processor is further configured to generate a same DFT size for each PDCCH of the one or more PDCCH.

20. The BS of claim 15 , wherein the DFT size is configured by higher layers via New Radio (NR) minimum system information (MSI), NR remaining minimum system information (RMSI), NR other system information (OSI), or radio resource control (RRC) signaling.