Altitude-aware energy saving methods and apparatuses

1. An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

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

receive, from a network element, information comprising a coupling loss change between the apparatus and the network element when the network element is at first altitude and at a second altitude; and

control an uplink transmission based on the received information,

wherein during the controlling, the at least one memory and the computer program code are further configured, with the at least one processor, to cause the apparatus at least to receive, from the network element, a reduced transmit power command, and adjust transmit power in the uplink transmission based on the reduced transmit power command associated with a timing that is used when the uplink transmission is performed.

2. The apparatus according to claim 1 , wherein the at least one memory and the computer program code are further configured, with the at least one processor, to cause the apparatus at least to:

receive a signal measurement from the network element; and

adjust an initial power reduction rate of the uplink transmission by estimating a path loss based on the received signal measurement.

3. The apparatus according to claim 1 , wherein the at least one memory and the computer program code are further configured, with the at least one processor, to cause the apparatus at least to:

transmit to the network element a report comprising information of

whether a delayed transmission is selected,

an application type, and

a maximum allowed delay.

4. An apparatus, comprising:

at least one processor; and

at least one memory comprising computer program code,

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

receive, from a network element, information comprising a coupling loss change between the apparatus and the network element when the network element is at first altitude and at a second altitude; and

control an uplink transmission based on the received information,

wherein during the controlling, the at least one memory and the computer program code are further configured, with the at least one processor, to cause the apparatus at least to:

calculate, based on the coupling loss change, a transmit power level to achieve a current data rate in the uplink transmission;

adjust a transmit power in the uplink transmission based on the calculated transmit power level to maintain the current data rate; and

adjust a timing that is used when the uplink transmission is performed.

5. A method, comprising:

receiving, from a network element, information comprising a coupling loss change between a user equipment and the network element when the network element is at a first altitude and at a second altitude; and

controlling an uplink transmission based on the received information,

wherein during the controlling, the method comprises receiving, from the network element, a reduced transmit power command, and adjusting transmit power in the uplink transmission based on the reduced transmit power command associated with a timing that is used when the uplink transmission is performed.

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

receiving a signal measurement from the network element; and

adjusting an initial power reduction rate of the uplink transmission by estimating a path loss based on the received signal measurement.

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

transmitting to the network element a report comprising information of

whether a delayed transmission is selected,

an application type, and

a maximum allowed delay.

8. A method, comprising:

receiving, from a network element, information comprising a coupling loss change between a user equipment and the network element when the network element is at a first altitude and at a second altitude; and

controlling an uplink transmission based on the received information,

wherein during the controlling, the method comprises:

calculating, based on the coupling loss change, a transmit power level to achieve a current data rate in the uplink transmission;

adjusting a transmit power in the uplink transmission based on the calculated transmit power level to maintain the current data rate; and

adjusting a timing that is used when the uplink transmission is performed.

9. A method, comprising:

receiving, from a user equipment, a report comprising status information;

determining a transmit timing and a transmit power based on the report to achieve a current data rate;

controlling a downlink transmission based on the transmit timing and the transmit power; and

estimating a coupling loss between an aerial base station (or an aerial node or station) and the user equipment at a future altitude based on a current elevation angle of the apparatus and a current coupling loss between the apparatus and the user equipment.

10. The method according to claim 9 , wherein the status information comprises:

whether delayed transmission is selected by the user equipment,

an application type used by the user equipment, and

a maximum allowed delay reported by the user equipment.

11. The method according to claim 10 , wherein in determining the transmit timing, the method comprises:

considering the maximum allowed delay reported by the user equipment.

12. A method, comprising:

receiving, from a user equipment, a report comprising status information;

determining a transmit timing and a transmit power based on the report to achieve a current data rate; and

controlling a downlink transmission based on the transmit timing and the transmit power,

wherein in determining the transmit power, the method comprises:

estimating, based on the report and a timing advance value of the user equipment, a clutter loss and an elevation angle of the user equipment; and

calculating a coupling loss change based on the clutter loss and the elevation angle.