Multi-numerology frame structure for NR operation in mm-wave frequency bands

1. A network node configured to communicate with a wireless device, the network node comprising:

processing circuitry configured to:

dynamically indicate a mixed numerology to the wireless device for implementation, the mixed numerology corresponding to a first numerology for a data channel and a second numerology for a control channel, the first numerology being different from the second numerology;

indicate a preconfigured subcarrier spacing for a bandwidth part, BWP, in a carrier, the dynamically indicated mixed numerology configured to change a subcarrier spacing for the data channel from the preconfigured subcarrier spacing to a first subcarrier spacing associated with the first numerology; and

add at least one demodulation reference signal, DMRS, symbol to the data channel to densify a DMRS allocation that is based on the preconfigured subcarrier spacing.

2. The network node of claim 1 , wherein the additional at least one DMRS symbol is distributed throughout the data channel in a time domain.

3. The network node of claim 1 , wherein the additional at least one DMRS symbol is front-loaded next to another DMRS symbol of the DMRS allocation.

4. The network node of claim 1 , wherein the data channel and control channel are allocated within a bandwidth part, BWP, that is defined by a plurality of subcarrier spacings, the plurality of subcarrier spacing including a first subcarrier spacing associated with the first numerology and a second subcarrier spacing associated with the second numerology.

5. The network node of claim 4 , wherein the plurality of subcarrier spacings are based on a preconfigured subcarrier spacing for the BWP.

6. The network node of claim 5 , wherein a resource block start position and a size of the BWP are based at least in part on the preconfigured subcarrier spacing.

7. The network node of claim 4 , wherein the plurality of subcarrier spacings are based on a largest subcarrier spacing of the plurality of subcarrier spacings.

8. The network node of claim 7 , wherein a resource block start position and a size of the BWP are based at least in part on the largest subcarrier spacing of the plurality of subcarrier spacings.

9. The network node of claim 1 , wherein the first numerology for the data channel is associated with a larger subcarrier spacing than a subcarrier spacing associated with the second numerology.

10. The network node of claim 9 , wherein the subcarrier spacing associated with the second numerology corresponds to a subcarrier spacing preconfigured for a bandwidth part, BWP, in which the data channel and control channel are transmitted.

11. The network node of claim 1 , wherein the processing circuitry is further configured to indicate the first numerology at least in part by signaling of an expansion factor, the expansion factor configured to change a subcarrier spacing from a preconfigured subcarrier spacing for a bandwidth part, BWP, to a first subcarrier spacing associated with the first numerology using the expansion factor.

12. The network node of claim 11 , wherein the signaling corresponds to one of semi-static radio resource control, RRC, signaling, semi-persistent medium access control, MAC, control element, CE, signaling and downlink control information, DCI, signaling.

13. The network node of claim 12 , wherein the DCI signaling includes a subcarrier spacing section field and a frequency domain resource allocation field that are jointly encoded as a bit field having a predefined bit size.

14. The network node of claim 13 , wherein a subset of most significant bits in the bit field are configured to indicate the first subcarrier spacing.

15. The network node of claim 1 , wherein the processing circuitry is further configured to rate match the data channel to a channel state information reference signal, CSI-RS, associated with a different subcarrier spacing than the first subcarrier spacing.

16. The network node of claim 1 , wherein the processing circuitry is further configured to multiplex a plurality of sounding reference signals, SRSs, received from a plurality of wireless devices, the plurality of SRSs being associated with a plurality of subcarrier spacings including at least a first subcarrier spacing associated with the first numerology.

17. A wireless device configured to communicate with a network node, the wireless device comprising:

processing circuitry configured to:

receive a dynamic indication of a mixed numerology, the mixed numerology corresponding to a first numerology for a data channel and a second numerology for a control channel, the first numerology being different from the second numerology; and

cause implementation of the mixed numerology;

receive an indication for a preconfigured subcarrier spacing for a bandwidth part, BWP, in carrier, the dynamically indicated mixed numerology configured to change a subcarrier spacing for the data channel from the preconfigured subcarrier spacing to a first subcarrier spacing associated with the first numerology; and

the data channel includes at least one added demodulation reference signal, DMRS, symbol for densifying a DMRS allocation that is based on the preconfigured subcarrier spacing.

18. A method implemented by a network node that is configured to communicate with a wireless device, the method comprising:

dynamically indicating a mixed numerology to the wireless device for implementation, the mixed numerology corresponding to a first numerology for a data channel and a second numerology for a control channel, the first numerology being different from the second numerology;

indicating a preconfigured subcarrier spacing for a bandwidth part, BWP, in a carrier, the dynamically indicated mixed numerology configured to change a subcarrier spacing for the data channel from the preconfigured subcarrier spacing to a first subcarrier spacing associated with the first numerology; and

adding at least one demodulation reference signal, DMRS, symbol to the data channel to densify a DMRS allocation that is based on the preconfigured subcarrier spacing.

19. A method implemented by a wireless device configured to communicate with a network node, the method comprising:

receiving a dynamic indication of a mixed numerology, the mixed numerology corresponding to a first numerology for a data channel and a second numerology for a control channel, the first numerology being different from the second numerology;

causing implementation of the mixed numerology;

receiving an indication for a preconfigured subcarrier spacing for a bandwidth part, BWP, in carrier, the dynamically indicated mixed numerology configured to change a subcarrier spacing for the data channel from the preconfigured subcarrier spacing to a first subcarrier spacing associated with the first numerology; and

the data channel including at least one added demodulation reference signal, DMRS, symbol for densifying a DMRS allocation that is based on the preconfigured subcarrier spacing.