Systems, methods and apparatuses for terrestrial and non-terrestrial networks interference mitigation

1. A method, comprising:

exchanging, by a non-terrestrial network node, round trip time (RTT) information with at least one terrestrial network node;

informing the at least one terrestrial network node of resources scheduled at the non-terrestrial network node for one or more user equipment (UEs) to coordinate interference mitigation with the at least one terrestrial network node;

wherein the informing comprises informing about a list of scheduled resource blocks (RBs) for at least one user equipment in an area of coverage overlap between the terrestrial network node and the non-terrestrial network node.

2. The method according to claim 1 , further comprising estimating a maximum round trip time (RTT) from a cell edge user equipment.

3. The method according to claim 1 , further comprising:

obtaining a location of the at least one terrestrial network node from a core network; and

estimating the area of coverage overlap with the at least one terrestrial network node.

4. The method according to claim 3 , wherein the informing comprises taking into account scheduled user equipment location and the location of the at least one terrestrial network node.

5. The method according to claim 1 , further comprising:

estimating a location of the one or more user equipment (UEs) based on a timing advance; and

tracking timing advance commands issued to the one or more user equipment (UEs) to keep an estimate of the location of the one or more user equipment (UEs) and the round trip time (RTT).

6. The method according to claim 1 , wherein the sending comprises sending the list of scheduled resource blocks (RBs) in a relative narrowband transmit power information element.

7. The method according to claim 1 , further comprising receiving an indication of scheduling decisions from the at least one terrestrial network node.

8. A non-transitory computer readable medium storing a program of instructions, execution of which by a processor configures an apparatus to at least to perform the method of claim 1 .

9. An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to

exchange round trip time (RTT) information with at least one terrestrial network node;

inform the at least one terrestrial network node of resources scheduled at the apparatus for one or more user equipment (UEs) to coordinate interference mitigation with the at least one terrestrial network node;

wherein the informing comprises informing about a list of scheduled resource blocks (RBs) for at least one user equipment in an area of coverage overlap between the terrestrial network node and the non-terrestrial network node.

10. The apparatus according to claim 9 , wherein the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus at least to estimate a maximum round trip time (RTT) from a cell edge user equipment.

11. The apparatus according to claim 9 , wherein the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus at least to:

obtain a location of the at least one terrestrial network node from a core network; and

estimate the area of coverage overlap with the at least one terrestrial network node.

12. The apparatus according to claim 9 , wherein the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus at least to:

estimate a location of the one or more user equipment (UEs) based on a timing advance; and

track timing advance commands issued to the one or more user equipment (UEs) to keep an estimate of the location of the one or more user equipment (UEs) and the round trip time (RTT).

13. The apparatus according to claim 11 , wherein the informing comprises taking into account scheduled user equipment location and the location of the at least one terrestrial network node.

14. The apparatus according to claim 9 , wherein the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus at least to send the list of scheduled resource blocks (RBs) in a relative narrowband transmit power information element.

15. The apparatus according to claim 9 , wherein the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus at least to:

receive an indication of scheduling decisions from the at least one terrestrial network node.

16. A method, comprising:

exchanging, by a terrestrial network node, round trip time (RTT) information with at least one non-terrestrial network node;

receiving, from the at least one non-terrestrial network node, an indication of resources scheduled at the at least one non-terrestrial network node for one or more user equipment (UEs); and

using at least the round trip time (RTT) information and the received indication of the scheduled resources to coordinate interference mitigation with the at least one non-terrestrial network node;

wherein the receiving comprises receiving a list of scheduled resource blocks (RBs) for at least one user equipment in an area of coverage overlap between the terrestrial network node and the non-terrestrial network node.

17. The method according to claim 7 , wherein the receiving comprises receiving the list of scheduled resource blocks (RBs) in a relative narrowband transmit power information element.

18. The method according to claim 16 , wherein the using comprises at least one of:

reducing downlink power in the resource blocks (RBs) indicated by the at least one non-terrestrial network node or avoiding scheduling user equipment (UEs) that will be interfered by the non-terrestrial network node in the indicated resource blocks (RBs); or

using a more robust coding and modulation scheme (MCS) in the indicated resource blocks (RBs).

19. The method according to claim 16 , wherein the using comprises at least one of:

assigning non-overlapping resources such that resource blocks (RBs) that are being interfered by user equipment (UEs) served by the non-terrestrial network node at slots indicated through the round trip time are not used by user equipment (UEs) served by the terrestrial network node; or

using a more robust coding and modulation scheme (MCS) for resource blocks (RBs) that are being interfered by user equipment (UEs) served by the non-terrestrial network node at slots indicated through the round trip time.

20. The method according to claim 16 , further comprising transmitting, to the non-terrestrial network node, an indication of scheduling decisions made at the terrestrial network node.

21. A non-transitory computer readable medium storing a program of instructions, execution of which by a processor configures an apparatus to at least to perform the method of claim 16 .

22. An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

the at least one memory and computer program code configured, with the at least one processor, to cause the apparatus at least to

exchange round trip time (RTT) information with at least one non-terrestrial network node;

receive, from the at least one non-terrestrial network node, an indication of resources scheduled at the at least one non-terrestrial network node for one or more user equipment (UEs); and

use at least the round trip time (RTT) information and the received indication of the scheduled resources to coordinate interference mitigation with the at least one non-terrestrial network node;

wherein the receiving comprises receiving a list of scheduled resource blocks (RBs) for at least one user equipment in an area of coverage overlap between the terrestrial network node and the non-terrestrial network node.

23. The apparatus according to claim 22 , wherein the list of scheduled resource blocks (RBs) is received in a relative narrowband transmit power information element.

24. The apparatus according to claim 22 , wherein, to coordinate the interference mitigation, the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus to perform at least one of:

reduce downlink power in the resource blocks (RBs) indicated by the at least one non-terrestrial network node or avoiding scheduling user equipment (UEs) that will be interfered by the non-terrestrial network node in the indicated resource blocks (RBs); or

use a more robust coding and modulation scheme (MCS) in the indicated resource blocks (RBs).

25. The apparatus according to claim 22 , wherein, to coordinate the interference mitigation, the at least one memory and computer program code are configured, with the at least one processor, to cause the apparatus to perform at least one of:

assign non-overlapping resources such that resource blocks (RBs) that are being interfered by user equipment (UEs) served by the non-terrestrial network node at slots indicated through the round trip time are not used by user equipment (UEs) served by the terrestrial network node; or

use a more robust coding and modulation scheme (MCS) for resource blocks (RBs) that are being interfered by user equipment (UEs) served by the non-terrestrial network node at slots indicated through the round trip time.

26. The apparatus according to claim 22 , further comprising transmitting, to the non-terrestrial network node, an indication of scheduling decisions made at the terrestrial network node.