JOINT RESOURCE MAP DESIGN OF DM-RS AND PT-RS

1 . A method for use in a radio node in a wireless communication system for one of transmitting and receiving a phase-tracking reference signal, PT-RS, the method comprising:

obtaining information about a position in a time domain of a scheduled first demodulation reference signal, DM-RS, in a slot; and

one of transmitting and receiving the PT-RS within the slot, the position of the PT-RS depending on the position in the time domain of the scheduled first DM-RS.

2 . The method of claim 1 , wherein the obtaining comprises one of receiving information about and determining the position in the time domain of the scheduled first DM-RS.

3 . The method of claim 1 , further comprising:

obtaining information about a position of a first time symbol in a slot scheduled for data transmission; and

obtaining information about a position of a last time symbol in the slot scheduled for data transmission.

4 . The method of claim 1 , further comprising:

obtaining information indicating a scheduled modulation and coding scheme, MCS; and

transmitting the PT-RS with a time density based on the scheduled MCS.

5 . The method of claim 4 , wherein the time density is one of 1, ½ and ¼.

6 . The method of claim 1 , further comprising:

mapping the PT-RS to resource elements, REs, in the slot based on one or more of a position of the scheduled first DM-RS, a scheduled MCS, a required time density, a position of the first time symbol scheduled for data transmission and a position of the last time symbol scheduled for data transmission.

7 . The metho/d of claim 1 , wherein the first DM-RS is scheduled in resource elements, REs, which span a plurality of subcarriers in frequency and at least one time symbol of the slot in time, while the PT-RS is one of transmitted and received in REs which span at least one subcarrier in frequency and multiple time symbols of the slot in time.

8 . The method of any of claim 1 , wherein a physical resource block, PRB, of the slot has 12 subcarriers in the frequency domain and one of 12 and 14 time symbols in the time domain.

9 . The method of claim 1 , wherein the radio node is a wireless device.

10 . The method of claim 1 , wherein the radio node is a network node.

11 . A radio node in a wireless communication system configured for one of transmitting and receiving a phase tracking-reference signal, PT-RS, the radio node comprising:

processing circuitry configured to:

obtain information about a position in a time domain of a scheduled first demodulation reference signal, DM-RS in a slot; and

one of transmit and receive the PT-RS within the slot, the position of the PT-RS depending on the position in the time domain of the scheduled first DM-RS.

12 . The radio node of claim 11 , wherein the obtaining comprises one of receiving and determining information about the position in the time domain of the scheduled first DM-RS.

13 . The radio node of claim 11 , wherein the processing circuitry is further configured to:

obtain information about a position of a first time symbol in a slot scheduled for data transmission; and

obtain information about a position of a last time symbol in the slot scheduled for data transmission.

14 . The radio node claim 11 , wherein the processing circuitry is further configured to:

obtain information indicating a scheduled modulation and coding scheme, MCS; and

transmit the PT-RS with a time density based on the scheduled MCS.

15 . The radio node of claim 14 , wherein the time density is one of 1, ½ and ¼.

16 . The radio node of claim 11 , wherein the processing circuitry is further configured to:

map the PT-RS to resource elements, REs, in the slot based on one or more of a position of the scheduled first DM-RS, a scheduled MCS, a required time-density, a position of the first time symbol scheduled for data transmission and a position of the last time symbol scheduled for data transmission.

17 . The radio node of any of claim 11 , wherein the first DM-RS is scheduled in resource elements, REs, which span a plurality of subcarriers in frequency and at least one time symbol of the slot in time, while the PT-RS is one of transmitted and received in REs which span at least one subcarrier in frequency and multiple time symbols of the slot in time.

18 . The radio node of claim 11 , wherein a physical resource block, PRB, of the slot has 12 subcarriers in the frequency domain and one of 12 and 14 time symbols in the time domain.

19 . The radio node of claim 11 , wherein the radio node is a wireless device.

20 . The radio node of claim 11 , wherein the radio node is a network node.