Base station signaling for enhanced channel estimation for new radio coverage

1. A method for channel estimation in a wireless system, comprising:

transmitting, to a wireless device, an indication of a physical downlink channel configuration for receiving a physical downlink channel transmission, the physical downlink channel transmission including a demodulation reference signal (DMRS);

receiving, from the wireless device, an indication that the wireless device supports bundling DMRS signals across multiple slots and an indication that the wireless device supports dynamic DMRS reconfiguration;

transmitting, to the wireless device, a DMRS configuration, wherein the DMRS configuration includes a channel estimation bundle window indicating that channel estimation may be performed across multiple slots, and wherein the DMRS configuration further indicates a number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window;

transmitting, by a wireless node and based on the DMRS configuration, a set of DMRS signals in the channel estimation bundle window, wherein a first DMRS signal of the set of DMRS signals is transmitted in a first slot, and wherein a second DMRS signal of the set of DMRS signals is transmitted in a second slot, and wherein the first DMRS signal and the second DMRS signal are configured for use by the wireless device to estimate a radio channel based on the first DMRS signal and the second DMRS signal, and

transmit a DMRS reconfiguration indication, the DMRS reconfiguration indication changing the number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window.

2. The method of claim 1 , wherein the physical downlink channel comprises one of a physical downlink shared channel (PDSCH) or a physical downlink control channel (PDCCH).

3. The method of claim 2 , wherein a same PDSCH precoding is used within the channel estimation bundle window.

4. The method of claim 1 , wherein the DMRS configuration includes an indication that the DMRS signals may be estimated across different transport blocks.

5. The method of claim 1 , wherein the DMRS configuration includes an indication that the DMRS signals may be estimated across different DMRS repetitions.

6. The method of claim 1 , wherein the DMRS configuration is transmitted via one of radio resource control signaling, within a field in a downlink control information (DCI), or within a media access control (MAC) control element (MAC CE).

7. The method of claim 1 , wherein the first DMRS signal and the second DMRS signal are transmitted at a same power.

8. A wireless node, comprising:

a radio; and

a processor operably coupled to the radio;

wherein the processor is configured to, when executing instructions stored in memory, cause the wireless node to:

transmit, to a wireless device, an indication of a physical uplink channel configuration for transmitting a physical uplink channel transmission including a demodulation reference signal (DMRS) schedule;

receive, from the wireless device, an indication that the wireless device supports bundling DMRS signals across multiple slots and an indication that the wireless device supports dynamic DMRS reconfiguration;

transmit, to the wireless device, a DMRS configuration, wherein the DMRS configuration includes a channel estimation bundle window indicating that channel estimation may be performed across multiple slots, and wherein the DMRS configuration further indicates a number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window;

receive a set of DMRS signals based on the DMRS configuration and within the channel estimation bundle window, wherein a first DMRS signal of the set of DMRS signals is received in a first slot, and wherein a second DMRS signal of the set of DMRS signals is received in a second slot;

estimate a radio channel based on the first DMRS signal and the second DMRS signal;

decode a transmission from the wireless device based on the estimated radio channel; and

transmit, to the wireless device, a DMRS reconfiguration indication, the DMRS reconfiguration indication changing the number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window.

9. The wireless node of claim 8 , wherein the physical uplink channel comprises one of a physical uplink shared channel or a physical uplink control channel.

10. The wireless node of claim 8 , wherein the radio channel is estimated based on the first DMRS signal and the second DMRS signal being transmitted at the same power within the channel estimation bundle window.

11. The wireless node of claim 10 , wherein the channel estimation bundle window is defined for a set of slots.

12. The wireless node of claim 10 , wherein the channel estimation bundle window comprises a sliding window of the number of slots of the channel estimation bundle window.

13. The wireless node of claim 10 , wherein the number of slots for the channel estimation bundle window is the same as a number of slots in an uplink/downlink configuration.

14. The wireless node of claim 8 , wherein the DMRS configuration indicates a number of slots for the channel estimation bundle window.

15. The wireless node of claim 8 ,

wherein the DMRS reconfiguration indication is transmitted within a downlink control information (DCI), or within a media access control control element (MAC CE).

16. The wireless node of claim 8 , wherein the number of DMRS signals are adjusted for each slot of the channel estimation bundle window.

17. The wireless node of claim 8 , wherein the number of DMRS signals are adjusted for less than all of the slots of the channel estimation bundle window.

18. The wireless node of claim 17 , wherein the DMRS signals are reconfigured such that:

no DMRS signal is transmitted in at least one slot of the channel estimation bundle window; and

the DMRS signal is transmitted in slots that are transmitted earlier in time than the at least one slot where no DMRS signal is transmitted.

19. The wireless node of claim 8 , wherein a DMRS port is changed for each channel estimation bundle window.

20. An integrated circuit, comprising circuitry configured to cause a wireless node to:

transmit, to a wireless device, an indication of a physical downlink channel configuration for receiving a physical downlink channel transmission, the physical downlink channel transmission including a demodulation reference signal (DMRS);

receive, from the wireless device, an indication that the wireless device supports bundling DMRS signals across multiple slots and an indication that the wireless device supports dynamic DMRS reconfiguration;

transmit, to the wireless device, a DMRS configuration, wherein the DMRS configuration includes a channel estimation bundle window indicating that channel estimation may be performed across multiple slots, and wherein the DMRS configuration further indicates a number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window;

transmit, based on the DMRS configuration, a set of DMRS signals in the channel estimation bundle window, wherein a first DMRS signal of the set of DMRS signals is transmitted in a first slot, and wherein a second DMRS signal of the set of DMRS signals is transmitted in a second slot, and wherein the first DMRS signal and the second DMRS signal are configured for use by the wireless device to estimate a radio channel based on the first DMRS signal and the second DMRS signal, and

transmit a DMRS reconfiguration indication, the DMRS reconfiguration indication changing the number of DMRS signals to transmit in at least one of the multiple slots of the channel estimation bundle window.