Method and device in communication node used for NR NTN communications

1. A method in a first-type communication node for wireless communications, comprising:

receiving first information; and

transmitting a first radio signal;

wherein a length of a time interval between a start time for transmitting the first radio signal and a first reference time is equal to a sum of a first timing adjustment and a second timing adjustment, the first timing adjustment being one of X candidate timing adjustments, the X being a positive integer greater than 1; the second timing adjustment is used for determining a transmission timing of a radio signal transmitted before the first radio signal in time domain; a transmitter of the first radio signal determines the first timing adjustment out of the X candidate timing adjustments by itself, and the first information is used for determining the X candidate timing adjustments; and the first information is transmitted via an air interface.

2. The method according to claim 1 , also comprising:

receiving a second radio signal;

wherein the second radio signal is used for determining the first reference time.

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

transmitting a third radio signal;

wherein the second timing adjustment is used for determining a transmission timing of the third radio signal, or a sum of the second timing adjustment and a third timing adjustment is used for determining a transmission timing of the third radio signal; the third timing adjustment is one of Y candidate timing adjustments, and a transmitter of the third radio signal determines the third timing adjustment out of the Y candidate timing adjustments by itself, the Y being a positive integer greater than 1; and a start time for transmitting the third radio signal is earlier than a start time for transmitting the first radio signal.

4. The method according to claim 1 , also comprising:

receiving second information;

wherein the X candidate timing adjustments are respectively equal to X candidate timing offsets plus a target timing adjustment, the second information is used for determining the target timing adjustment, and a transmitter of the first radio signal selects a candidate timing offset corresponding to the first timing adjustment out of the X candidate timing offsets by itself; the first information is used for indicating the X candidate timing offsets, or that the X candidate timing offsets are related to at least one of the target timing adjustment or a subcarrier spacing (SCS) of subcarriers occupied by the first radio signal; and the second information is transmitted via the air interface.

5. The method according to claim 4 , wherein a minimum adjustment step-size of the target timing adjustment is related to an SCS of subcarriers occupied by the first radio signal.

6. The method according to claim 1 , also comprising:

receiving third information;

wherein the third information is used for determining an SCS of subcarriers occupied by the first radio signal; and the third information is transmitted via the air interface.

7. The method according to claim 1 , wherein a transmitter of the first radio signal selects the first timing adjustment out of the X candidate timing adjustments according to a geographic position of the transmitter of the first radio signal when transmitting the first radio signal, or the transmitter of the first radio signal selects the first timing adjustment out of the X candidate timing adjustments according to a moving speed of the transmitter of the first radio signal when transmitting the first radio signal, or the transmitter of the first radio signal selects the first timing adjustment out of the X candidate timing adjustments according to a crystal-oscillator offset of the transmitter of the first radio signal when transmitting the first radio signal.

8. A first-type communication node for wireless communications, comprising:

a first receiver, receiving first information; and

a first transmitter, transmitting a first radio signal;

wherein a length of a time interval between a start time for transmitting the first radio signal and a first reference time is equal to a sum of a first timing adjustment and a second timing adjustment, the first timing adjustment being one of X candidate timing adjustments, the X being a positive integer greater than 1; the second timing adjustment is used for determining a transmission timing of a radio signal transmitted before the first radio signal in time domain; a transmitter of the first radio signal determines the first timing adjustment out of the X candidate timing adjustments by itself, and the first information is used for determining the X candidate timing adjustments; and the first information is transmitted via an air interface.

9. The first-type communication node according to claim 8 , wherein the first receiver receives a second radio signal; herein, the second radio signal is used for determining the first reference time.

10. The first-type communication node according to claim 8 , wherein the first transmitter transmits a third radio signal; herein, the second timing adjustment is used for determining a transmission timing of the third radio signal, or a sum of the second timing adjustment and a third timing adjustment is used for determining a transmission timing of the third radio signal; the third timing adjustment is one of Y candidate timing adjustments, and a transmitter of the third radio signal determines the third timing adjustment out of the Y candidate timing adjustments by itself, the Y being a positive integer greater than 1; and a start time for transmitting the third radio signal is earlier than a start time for transmitting the first radio signal.

11. The first-type communication node according to claim 8 , wherein the first receiver receives second information; herein, the X candidate timing adjustments are respectively equal to X candidate timing offsets plus a target timing adjustment, the second information is used for determining the target timing adjustment, and a transmitter of the first radio signal selects a candidate timing offset corresponding to the first timing adjustment out of the X candidate timing offsets by itself; the first information is used for indicating the X candidate timing offsets, or that the X candidate timing offsets are related to at least one of the target timing adjustment or an SCS of subcarriers occupied by the first radio signal; and the second information is transmitted via the air interface.

12. The first-type communication node according to claim 11 , wherein a minimum adjustment step-size of the target timing adjustment is related to an SCS of subcarriers occupied by the first radio signal.

13. The first-type communication node according to claim 8 , wherein the first receiver receives third information; herein, the third information is used for determining an SCS of subcarriers occupied by the first radio signal; and the third information is transmitted via the air interface.

14. The first-type communication node according to claim 8 , wherein a transmitter of the first radio signal selects the first timing adjustment out of the X candidate timing adjustments according to a geographic position of the transmitter of the first radio signal when transmitting the first radio signal, or the transmitter of the first radio signal selects the first timing adjustment out of the X candidate timing adjustments according to a moving speed of the transmitter of the first radio signal when transmitting the first radio signal, or the transmitter of the first radio signal selects the first timing adjustment out of the X candidate timing adjustments according to a crystal-oscillator offset of the transmitter of the first radio signal when transmitting the first radio signal.

15. A second-type communication node for wireless communications, comprising:

a second transmitter, transmitting first information; and

a second receiver, receiving a first radio signal;

wherein a length of a time interval between a start time for transmitting the first radio signal and a first reference time is equal to a sum of a first timing adjustment and a second timing adjustment, the first timing adjustment being one of X candidate timing adjustments, the X being a positive integer greater than 1; the second timing adjustment is used for determining a transmission timing of a radio signal transmitted before the first radio signal in time domain; a transmitter of the first radio signal determines the first timing adjustment out of the X candidate timing adjustments by itself, and the first information is used for determining the X candidate timing adjustments; and the first information is transmitted via an air interface.

16. The second-type communication node according to claim 15 , wherein the second transmitter transmits a second radio signal; herein, the second radio signal is used for determining the first reference time.

17. The second-type communication node according to claim 15 , wherein the second receiver receives a third radio signal; herein, the second timing adjustment is used for determining a transmission timing of the third radio signal, or a sum of the second timing adjustment and a third timing adjustment is used for determining a transmission timing of the third radio signal; the third timing adjustment is one of Y candidate timing adjustments, and a transmitter of the third radio signal determines the third timing adjustment out of the Y candidate timing adjustments by itself, the Y being a positive integer greater than 1; and a start time for transmitting the third radio signal is earlier than a start time for transmitting the first radio signal.

18. The second-type communication node according to claim 15 , wherein the second transmitter transmits second information; herein, the X candidate timing adjustments are respectively equal to X candidate timing offsets plus a target timing adjustment, the second information is used for determining the target timing adjustment, and a transmitter of the first radio signal selects a candidate timing offset corresponding to the first timing adjustment out of the X candidate timing offsets by itself; the first information is used for indicating the X candidate timing offsets, or that the X candidate timing offsets are related to at least one of the target timing adjustment or an SCS of subcarriers occupied by the first radio signal; and the second information is transmitted via the air interface.

19. The second-type communication node according to claim 18 , wherein a minimum adjustment step-size of the target timing adjustment is related to an SCS of subcarriers occupied by the first radio signal.

20. The second-type communication node according to claim 15 , wherein the second transmitter transmits third information, the third information being used for determining an SCS of subcarriers occupied by the first radio signal; and the third information is transmitted via the air interface.