Non-terrestrial network link adaptation

1. A method, comprising:

causing, by a base station, a first signal to be transmitted from a non-terrestrial station to user equipment during a first transmission time period;

receiving, by the base station, a communication indicating signal quality for a plurality of times during the first transmission time period;

obtaining, for the plurality of times, a plurality of fading losses associated with the first signal;

estimating, for a future time subsequent to the plurality of times, a first fading loss of a first loss type associated with the first signal by at least applying a first filter to the plurality of fading losses;

estimating, for the future time, a second fading loss of a second loss type associated with the signal by at least determining differences between the plurality of fading losses and the first fading loss;

calculating signal-to-interference-plus-noise-ratio (SINR) that includes at least one fading loss selected from the first fading loss and the second fading loss;

causing the non-terrestrial station to transmit a second signal for a second transmission time period that includes the future time, the second signal having first settings for modulation and channel coding parameters, the first settings determined based on the SINR calculated;

receiving communications indicating successful receipt of a defined number of second signal transmissions during the second transmission period; and

causing, as a result of receiving the communications indicating successful receipt of the defined number of second signal transmissions, the non-terrestrial station to transmit a third signal to the user equipment according to third modulation and channel coding parameters for a third transmission period.

2. The method of claim 1 , wherein estimating the first fading loss includes applying a low pass filter to the plurality of fading losses for the plurality of times.

3. The method of claim 1 , wherein estimating the second fading loss includes applying a predictive filter to the differences determined between the plurality of fading losses and the first fading loss.

4. The method of claim 1 , wherein estimating the second fading loss includes applying a Kalman filter to fast fading losses for the plurality of times.

5. A method, comprising:

causing, by a base station, a first signal to be transmitted from a non-terrestrial station to user equipment during a first transmission time period;

receiving, by the base station, a communication indicating signal quality for a plurality of times during the first transmission time period;

obtaining, for the plurality of times, a plurality of fading losses associated with the first signal;

estimating, for a future time subsequent to the plurality of times, a first fading loss of a first loss type associated with the first signal by at least applying a first filter to the plurality of fading losses;

estimating, for the future time, a second fading loss of a second loss type associated with the signal by at least determining differences between the plurality of fading losses and the first fading loss;

calculating signal-to-interference-plus-noise-ratio (SINR) that includes at least one fading loss selected from the first fading loss and the second fading loss;

causing the non-terrestrial station to transmit a second signal for a second transmission time period that includes the future time, the second signal having first settings for modulation and channel coding parameters, the first settings determined based on the SINR calculated;

receiving communications indicating successful receipt of a defined number of second signal transmissions during the second transmission period; and

causing, as a result of receiving the communications indicating unsuccessful receipt of the defined number of second signal transmissions, the non-terrestrial station to transmit a third signal to the user equipment according to previous modulation and channel coding parameters for a third transmission period.

6. The method of claim 5 , wherein the SINR is calculated based on the first fading loss estimated and a conservative value for the second fading loss.

7. The method of claim 5 , wherein the SINR is calculated based on the first fading loss estimated and the second fading loss estimated.

8. A method, comprising:

causing, by a base station, a first signal to be transmitted from a non-terrestrial station to user equipment during a first transmission time period;

receiving, by the base station, a communication indicating signal quality for a plurality of times during the first transmission time period;

obtaining, for the plurality of times, a plurality of fading losses associated with the first signal;

estimating, for a future time subsequent to the plurality of times, a first fading loss of a first loss type associated with the first signal by at least applying a first filter to the plurality of fading losses;

estimating, for the future time, a second fading loss of a second loss type associated with the signal by at least determining differences between the plurality of fading losses and the first fading loss;

calculating signal-to-interference-plus-noise-ratio (SINR) that includes at least one fading loss selected from the first fading loss and the second fading loss;

causing the non-terrestrial station to transmit a second signal for a second transmission time period that includes the future time, the second signal having first settings for modulation and channel coding parameters, the first settings determined based on the SINR calculated;

calculating a conservative SINR value based on location information of the user equipment, the conservative SINR value based on a conservative value for the first fading loss type and a conservative value for the second fading loss type;

receiving one or more communications indicating unsuccessful receipt of the second signal; and

causing, in response to receiving the one or more communications indicating unsuccessful receipt of the second signal, the non-terrestrial station to transmit a third signal according to settings for modulation and channel coding parameters selected based on the conservative SINR value.

9. A method, comprising:

calculating, by a base station, a first fading loss associated with signal transmission from a non-terrestrial station to user equipment for a first transmission period;

determining first modulation and channel coding settings based on the first fading loss;

causing the non-terrestrial station to transmit a first signal to the user equipment according to the first modulation and channel coding settings during the first transmission period;

receiving communications indicating whether the first signal was successfully received by the user equipment;

determining a second fading loss that is different than the first fading loss; and

causing, in response to receiving the communications, the non-terrestrial station to transmit a second signal according to second modulation and channel coding settings different than the first modulation and channel coding settings during a second transmission period;

receiving a communication indicating unsuccessful receipt of the second signal during the second transmission period; and

causing, in response to receiving the plurality of communications, the non-terrestrial station to transmit a third signal according to the first modulation and channel coding parameters during a third transmission period.

10. The method of claimer 9 , wherein the first fading loss calculated based on at least one estimated fading loss value.

11. The method of claim 10 , wherein the at least one estimated fading loss value includes a shadow fading loss estimate obtained using a low pass filter.

12. The method of claimer 9 , wherein the at least one estimated fading loss value includes a fast fading loss estimate obtained using a predictive filter.

13. The method of claimer 9 , wherein the at least one estimated fading loss value is obtained by at least:

determining a set of fading losses for a plurality of times;

applying a low pass filter to the set of fading losses to obtain a first fading loss estimate;

calculating differences between the set of fading losses and the first fading loss estimate; and

applying a predictive filter to the differences to obtain a second fading loss estimate.

14. The method of claim 13 , wherein the first fading loss includes the first fading loss estimate and the second fading loss estimate.

15. A communication system, comprising:

a receiver configured to receive communications from terrestrial user equipment and communications from a non-terrestrial network station;

a transmitter configured to transmit communications to the non-terrestrial network station;

one or more processors; and

memory storing instructions that, as a result of execution by the one or more processors, cause the communication system to:

calculate a first fading loss associated with signal transmission from a non-terrestrial station to user equipment for a first transmission period;

determine first modulation and channel coding settings based on the first fading loss;

cause the non-terrestrial station to transmit a first signal to the user equipment according to the first modulation and channel coding settings during the first transmission period;

receive communications indicating whether the first signal was successfully received by the user equipment;

determine a second fading loss that is different than the first fading loss;

cause, in response to receiving the communications, the non-terrestrial station to transmit a second signal according to second modulation and channel coding settings different than the first modulation and channel coding settings during a second transmission period; and

implement enhanced modulation and channel coding settings as the second modulation and channel coding settings in response to receiving communications indicating that a number of successfully received first signal transmissions by the user equipment exceed a defined threshold.

16. A communication system, comprising:

a receiver configured to receive communications from terrestrial user equipment and communications from a non-terrestrial network station;

a transmitter configured to transmit communications to the non-terrestrial network station;

one or more processors; and

memory storing instructions that, as a result of execution by the one or more processors, cause the communication system to:

calculate a first fading loss associated with signal transmission from a non-terrestrial station to user equipment for a first transmission period;

determine first modulation and channel coding settings based on the first fading loss;

cause the non-terrestrial station to transmit a first signal to the user equipment according to the first modulation and channel coding settings during the first transmission period;

receive communications indicating whether the first signal was successfully received by the user equipment;

determine a second fading loss that is different than the first fading loss; and

cause, in response to receiving the communications, the non-terrestrial station to transmit a second signal according to second modulation and channel coding settings different than the first modulation and channel coding settings during a second transmission period; and

implement diminished modulation and channel coding settings as the second modulation and channel coding settings in response to receiving communications indicating that a number of unsuccessfully received first signal transmissions by the user equipment exceed a defined threshold.