Communication method and communication apparatus

1 . A communication method for a first communication apparatus, wherein the method comprises:

receiving, a first signal from a second communication apparatus, wherein a first band used for communication between the first communication apparatus and a third communication apparatus overlaps a second band used for communication between the second communication apparatus and a fourth communication apparatus; and

adjusting a start moment of a first transmission frame of the first communication apparatus or an end moment of the first transmission frame based on the first signal, wherein:

a time interval between an adjusted start moment of the first transmission frame and a start moment of a second transmission frame of the second communication apparatus falls within an interval from T 1 −T 2 to T 1 +T 2 , or

a time interval between an adjusted end moment of the first transmission frame and an end moment of the second transmission frame falls within an interval from T 1 −T 3 to T 1 +T 3 , and

wherein T 1 is equal to 0 or a timing advance (TA), T 2 is a first threshold, and T 3 is a second threshold.

2 . The method according to claim 1 , wherein the adjusting comprises:

determining the start moment of the second transmission frame or the end moment of the second transmission frame based on the first signal; and

adjusting the start moment of the first transmission frame or the end moment of the first transmission frame based on the start moment of the second transmission frame or the end moment of the second transmission frame.

3 . The method according to claim 1 ,

wherein the second band is a frequency band used for downlink communication between the second communication apparatus and the fourth communication apparatus, and T 1 is equal to 0; and

wherein the adjusted start moment of the first transmission frame is aligned with the start moment of the second transmission frame, or the adjusted end moment of the first transmission frame is aligned with the end moment of the second transmission frame.

4 . The method according to claim 1 ,

wherein the second band is a frequency band used for uplink communication between the second communication apparatus and the fourth communication apparatus, and T 1 is equal to the TA; and

wherein the adjusting, the start moment of the first transmission frame or the end moment of the first transmission frame based on the start moment of the second transmission frame or the end moment of the second transmission frame comprises:

determining the TA; and

adjusting the start moment of the first transmission frame or the end moment of the first transmission frame based on the TA, wherein the time interval between the adjusted start moment of the first transmission frame and the start moment of the second transmission frame is time of the TA, or the time interval between the adjusted end moment of the first transmission frame and the end moment of the second transmission frame is the time of the TA.

5 . The method according to claim 4 , wherein the determining the TA comprises:

receiving, first indication information from the second communication apparatus, wherein the first indication information indicates the TA.

6 . The method according to claim 4 , wherein the method further comprises:

sending the TA.

7 . The method according to claim 1 , wherein the method further comprises:

sending third indication information to the second communication apparatus, wherein the third indication information indicates to the second communication apparatus to enable the second band.

8 . The method according to claim 1 , wherein the method further comprises:

enabling a satellite synchronization mode.

9 . The method according to claim 1 , wherein the method further comprises:

sending fourth indication information to the second communication apparatus, wherein the fourth indication information indicates a time-frequency resource used by a cell of the first communication apparatus.

10 . The method according to claim 1 , wherein:

the time interval between the adjusted start moment of the first transmission frame and the start moment of the second transmission frame of the second communication apparatus falls within the interval from T 1 −T 2 to T 1 +T 2 , and

the time interval between the adjusted end moment of the first transmission frame and the end moment of the second transmission frame falls within the interval from T 1 −T 3 to T 1 +T 3 .

11 . A communication method for a first communication apparatus, wherein the method comprises:

receiving, a first signal from a second communication apparatus, wherein a first band used for communication between the first communication apparatus and a third communication apparatus overlaps a second band used for communication between the second communication apparatus and a fourth communication apparatus;

adjusting a start moment of a first transmission frame of the first communication apparatus or an end moment of the first transmission frame based on the first signal, wherein:

a time interval between an adjusted start moment of the first transmission frame and a start moment of a second transmission frame of the second communication apparatus falls within an interval from T 1 −T 2 to T 1 +T 2 , or

a time interval between an adjusted end moment of the first transmission frame and an end moment of the second transmission frame falls within an interval from T 1 −T 2 to T 1 +T 2 , and

wherein T is equal to 0 or a timing advance (TA), T 2 is a first threshold, and T 2 is a second threshold; and

setting an advanced cyclic prefix (ACP) before each symbol in the first transmission frame, wherein a length of the ACP is greater than or equal to a third threshold.

12 . The method according to claim 11 , wherein the third threshold is any one of the following:

max (normal cyclic prefix (NCP), 2R/c), wherein max (NCP, 2R/c) is a maximum value of an NCP and 2R/c, R is a cell radius of the first communication apparatus, and c is a speed of light;

max (extended cyclic prefix (ECP), 2R/c), wherein max (ECP, 2R/c) is a maximum value of an ECP and 2R/c, R is a cell radius of the first communication apparatus, and c is a speed of light; or

a sum of a length of an NCP and 2R/c, wherein R is a cell radius of the first communication apparatus, and c is a speed of light.

13 . The method according to claim 11 , wherein the method further comprises:

sending second indication information, wherein the second indication information indicates to use the ACP.

14 . The method according to claim 13 , wherein the second indication information further indicates the length of the ACP.

15 . A first communication apparatus comprising:

at least one processor; and

a non-transitory computer-readable medium including computer-executable instructions that, when executed by the processor, cause the apparatus to carry out a method including:

receiving a first signal from a second communication apparatus, wherein a first band used for communication between the first communication apparatus and a third communication apparatus overlaps a second band used for communication between the second communication apparatus and a fourth communication apparatus; and

adjusting a start moment of a first transmission frame of the first communication apparatus or an end moment of the first transmission frame based on the first signal,

wherein a time interval between an adjusted start moment of the first transmission frame and a start moment of a second transmission frame of the second communication apparatus falls within an interval from T 1 −T 2 to T 1 +T 2 , or a time interval between an adjusted end moment of the first transmission frame and an end moment of the second transmission frame falls within an interval from T 1 −T 3 to T 1 +T 3 , and

wherein T 1 is equal to 0 or a timing advance (TA), T 2 is a first threshold, and T 3 is a second threshold.

16 . The communication apparatus according to claim 15 , wherein the adjusting comprises:

determining the start moment of the second transmission frame or the end moment of the second transmission frame based on the first signal; and

adjusting the start moment of the first transmission frame or the end moment of the first transmission frame based on the start moment of the second transmission frame or the end moment of the second transmission frame.

17 . The communication apparatus according to claim 15 ,

wherein the second band is a frequency band used for downlink communication between the second communication apparatus and the fourth communication apparatus, and T 1 is equal to 0; and

wherein the adjusted start moment of the first transmission frame is aligned with the start moment of the second transmission frame, or the adjusted end moment of the first transmission frame is aligned with the end moment of the second transmission frame.

18 . The communication apparatus according to claim 15 ,

wherein the second band is a frequency band used for uplink communication between the second communication apparatus and the fourth communication apparatus, and T 1 is equal to the TA; and

wherein the adjusting, the start moment of the first transmission frame or the end moment of the first transmission frame based on the start moment of the second transmission frame or the end moment of the second transmission frame comprises:

determining the TA; and

adjusting the start moment of the first transmission frame or the end moment of the first transmission frame based on the TA, wherein the time interval between the adjusted start moment of the first transmission frame and the start moment of the second transmission frame is time of the TA, or the time interval between the adjusted end moment of the first transmission frame and the end moment of the second transmission frame is the time of the TA.

19 . The communication apparatus according to claim 18 , wherein the determining the TA comprises:

receiving first indication information from the second communication apparatus, wherein the first indication information indicates the TA.

20 . The communication apparatus according to claim 15 , wherein the method further comprises:

setting an advanced cyclic prefix (ACP) before each symbol in the first transmission frame, wherein a length of the ACP is greater than or equal to a third threshold.

21 . The communication apparatus according to claim 20 , wherein the third threshold is any one of the following:

max (normal cyclic prefix (NCP), 2R/c), wherein max (NCP, 2R/c) is a maximum value of an NCP and 2R/c, R is a cell radius of the first communication apparatus, and c is a speed of light;

max (extended cyclic prefix (ECP), 2R/c), wherein max (ECP, 2R/c) is a maximum value of an ECP and 2R/c, R is a cell radius of the first communication apparatus, and c is a speed of light; or

a sum of a length of an NCP and 2R/c, wherein R is a cell radius of the first communication apparatus, and c is a speed of light.