Interference mitigation in terrestrial network—non-terrestrial network integrated systems

1 . A ground-based terrestrial network (TN) entity configured for wireless communications, comprising: one or more memories comprising processor-executable instructions; and one or more processors configured to execute the processor-executable instructions and cause the TN entity to:

obtain constellation information and trajectory information of one or more non-terrestrial network (NTN) entities in a NTN, from the one or more NTN entities, wherein the one or more NTN entities are configured to fly or orbit with respect to a surface of Earth;

determine a position of a user equipment (UE) in communication with the TN entity, based on position information provided by the UE;

determine a signal projection cone based on the position of the UE, a position of the TN entity, and a beam width of a beam used for the communication between the UE and the TN entity;

determine that the one or more NTN entities are located within the signal projection cone based on a geometry of the signal projection cone and the constellation information and the trajectory information of the one or more NTN entities; and

transmit a first signal corresponding to an uplink power control parameter to the UE based on the determination that the one or more NTN entities are located within the signal projection cone to reduce interference with the one or more NTN entities.

2 . The TN entity of claim 1 , wherein the first signal indicates to the UE to modify the uplink power control parameter.

3 . The TN entity of claim 2 , wherein the uplink power control parameter is a path loss value associated with the one or more NTN entities determined to be located within the signal projection cone.

4 . The TN entity of claim 3 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to receive the path loss value from the UE.

5 . The TN entity of claim 3 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to:

estimate the path loss value associated with the one or more NTN entities based on the position of the UE and the position of the TN entity; and

transmit the estimated path loss value to the UE via a downlink medium access control (MAC) control element (CE).

6 . The TN entity of claim 3 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to:

estimate the path loss value associated with the one or more NTN entities based on the position of the UE and the position of the TN entity; and

transmit the estimated path loss value to the UE via a downlink control information (DCI) information element (IE).

7 . The TN entity of claim 1 , wherein:

the TN entity comprises two or more transmission and reception points (TRP) to which the UE is connected,

the signal projection cone corresponds to a projection of the beam between the UE and a first TRP of the two or more TRPs of the TN entity, and

the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to:

transmit, based on the determination that the one or more NTN entities are located within the signal projection cone corresponding to the projection of the beam between the UE and the first TRP of the two or more TRPs of the TN entity, a second signal to the UE to switch from simultaneous transmission across multiple panels (STxMP) mode with the two or more TRPs to single transmission and reception point (s-TRP) mode with a second TRP of the two or more TRPs.

8 . The TN entity of claim 7 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to determine a timeframe when the one or more NTN entities are located within the signal projection cone corresponding to the projection of the beam between the UE and the first TRP.

9 . The TN entity of claim 8 , wherein the second signal comprises a timer value corresponding to the timeframe, wherein the timer value indicates to the UE a duration to operate in the s-TRP mode before switching back to STxMP mode.

10 . The TN entity of claim 1 , wherein to obtain the constellation information and the trajectory information of the NTN, the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to receive, from the NTN via an application function, the constellation information and the trajectory information of the NTN.

11 . The TN entity of claim 1 , wherein to obtain the constellation information and the trajectory information of the NTN, the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to receive the constellation information and the trajectory information of the NTN from a terrestrial network via an NG interface.

12 . The TN entity of claim 1 , wherein to obtain the constellation information and the trajectory information of the NTN, the one or more processors are configured to execute the processor-executable instructions and cause the TN entity to receive the constellation information and the trajectory information of the NTN from an NTN entity via an Xn interface.

13 . The TN entity of claim 1 , wherein the one or more processors are configured to execute the processor-executable instructions and further cause the TN entity to:

determine a timeframe when the one or more NTN entities are located within the signal projection cone; and

transmit, during the timeframe, the constellation information and the trajectory information of the NTN to one or more user equipments.

14 . The TN entity of claim 1 , wherein the one or more processors are configured to execute the processor-executable instructions and further cause the TN entity to:

receive, from one of the one or more NTN entities, a request to cause the UE to adjust an antenna configuration or a beamforming configuration; and

transmit the constellation information and the trajectory information of the NTN to one or more user equipments based on the received request.

15 . A user equipment (UE) configured for wireless communications, comprising: one or more memories comprising processor-executable instructions; and one or more processors configured to execute the processor-executable instructions and cause the UE to:

receive, from a ground-based terrestrial network (TN) entity, constellation information and trajectory information of one or more non-terrestrial network (NTN) entities in a non-terrestrial network (NTN), wherein the one or more NTN entities are configured to fly or orbit with respect to a surface of Earth;

compute a predicted path loss between a position of the UE and a position of an NTN entity of the one or more NTN entities based on the constellation information and the trajectory information;

compute an estimated received power at the NTN entity of the one or more NTN entities for a transmission from the UE to the NTN entity based on the constellation information and the trajectory information of the NTN, the predicted path loss from the UE to the NTN entity, and a transmit power of the UE;

determine that the estimated received power at the NTN entity is greater than a threshold stored in the one or more memories; and

adjust, based on a determination that the estimated received power at the NTN entity is greater than the threshold, an antenna configuration or a beamforming configuration for transmission between the UE and the TN entity thereby reducing interference to the NTN entity caused by transmission with the TN entity.

16 . The UE of claim 15 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the UE to:

receive, from the TN entity, a timeframe to adjust the antenna configuration or the beamforming configuration;

execute an adjustment of the antenna configuration or the beamforming configuration during the timeframe; and

return the antenna configuration or the beamforming configuration to a pre-adjustment configuration after the timeframe.

17 . The UE of claim 16 , wherein the timeframe corresponds to the NTN entity being located within a signal projection cone, the signal projection cone defining a projection of a beam used for communication between the UE and the TN entity.

18 . The UE of claim 15 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the UE to:

receive, from the TN entity, one or more criterion comprising at least one of (1) when to adjust the antenna configuration or the beamforming configuration or (2) how to adjust the antenna configuration or the beamforming configuration; and

store the one or more criterion in the one or more memories.

19 . The UE of claim 15 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the UE to:

determine that a transmit power of the UE, a path loss from the UE to the TN entity, and a signal quality toward the TN entity each meet a preconfigured value after the adjustment of the antenna configuration or the beamforming configuration for transmission between the UE and the TN entity; and

based on a determination that the transmit power of the UE, the path loss from the UE to the TN entity, or the signal quality toward the TN entity does not meet the preconfigured value, adjust the antenna configuration or the beamforming configuration.

20 . The UE of claim 15 , wherein the constellation information and the trajectory information of the NTN are obtained from a broadcasted system information block (SIB) from the TN entity.

21 . The UE of claim 15 , wherein the constellation information and the trajectory information of the NTN are obtained from a radio resource control (RRC) message from the TN entity.

22 . The UE of claim 15 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the UE to:

receive, from the TN entity, a validity duration, wherein the validity duration indicates when the constellation information and the trajectory information of the NTN or one or more criterion comprising how to adjust the antenna configuration or the beamforming configuration are valid; and

apply the adjustment of the antenna configuration or the beamforming configuration during the validity duration.

23 . The UE of claim 15 , wherein to adjust the antenna configuration or the beamforming configuration, the one or more processors are configured to reduce an antenna gain of one or more antenna elements of an antenna that are directed to the NTN entity.

24 . The UE of claim 15 , the one or more processors are configured to execute the processor-executable instructions and cause the UE to:

obtain a real-time NTN entity position from an orbital propagation model;

obtain, from a gyroscope of the UE, a motion of the UE;

obtain a location of the TN entity and a location of the UE;

determine, for one or more intervals of time, adjustments to the antenna configuration or the beamforming configuration based on the real-time NTN entity position, the motion of the UE, the location of the TN entity, the location of the UE, an uplink transmit power, and one or more characteristics of the antenna configuration; and

execute the adjustments of the antenna configuration or the beamforming configuration corresponding to the one or more intervals of time.

25 . The UE of claim 15 , wherein the one or more processors are configured to execute the processor-executable instructions and cause the UE to transmit an indication to the TN entity indicating when or how the antenna configuration or the beamforming configuration are adjusted.

26 . A method for wireless communications by a ground-based terrestrial network (TN) entity, the method comprising:

obtaining constellation information and trajectory information of one or more non-terrestrial network (NTN) entities in a NTN, from the one or more NTN entities, wherein the one or more NTN entities are configured to fly or orbit with respect to a surface of Earth;

determining a position of a user equipment (UE) in communication with the TN entity, based on position information provided by the UE;

determining a signal projection cone based on the position of the UE, a position of the TN entity, and a beam width of a beam used for the communication between the UE and the TN entity;

determining that the one or more NTN entities are located within the signal projection cone based on a geometry of the signal projection cone and the constellation information and the trajectory information of the one or more NTN entities; and

transmitting a first signal corresponding to an uplink power control parameter to the UE based on the determination that the one or more NTN entities are located within the signal projection cone to reduce interference with the one or more NTN entities.

27 . A method for wireless communications by a user equipment (UE) comprising:

receiving, from a ground-based terrestrial network (TN) entity, constellation information and trajectory information of one or more non-terrestrial network (NTN) entities in a NTN, wherein the one or more NTN entities are configured to fly or orbit with respect to a surface of Earth;

computing a predicted path loss between a position of the UE and a position of an NTN entity of the one or more NTN entities based on the constellation information and the trajectory information;

computing an estimated received power at the NTN entity of the one or more NTN entities for a transmission from the UE to the NTN entity based on the constellation information and the trajectory information of the NTN, the predicted path loss from the UE to the NTN entity, and a transmit power of the UE;

determining that the estimated received power at the NTN entity is greater than a threshold stored in one or more memories of the UE; and

adjusting, based on a determination that the estimated received power at the NTN entity is greater than the threshold, an antenna configuration or a beamforming configuration for transmission between the UE and the TN entity thereby reducing interference to the NTN entity caused by transmission with the TN entity.