Scheduling method and device

1. A scheduling method, comprising: receiving, by a second device, information about a transmission time difference that is sent by a first device, wherein the transmission time difference is a time difference between a control channel of a first link and a data channel that is of the first link and that is scheduled by the control channel of the first link; wherein the first link comprises a link between the first device and the second device; wherein the first device comprises a base station and the second device comprises a first relay device, or the first device comprises a second relay device and the second device comprises a third relay device; wherein the control channel of the first link comprises a channel used to send control information on the first link; and the data channel of the first link comprises a channel used to send data on the first link; determining, by the second device based on the information about the transmission time difference, whether to reserve a resource for the data channel of the first link, including performing a comparison between the transmission time difference and a processing delay; and performing, by the second device, scheduling a second link based on the information about the transmission time difference, wherein the second link is a link between the second device and a third device, and the third device comprises a terminal or a fourth relay device;

wherein the information about the transmission time difference further comprises at least one of the following: information (1) about the transmission time difference comprising: information about a value N of the transmission time difference; information (2) about the transmission time difference comprising: information that the transmission time difference is greater than or equal to M or information that the transmission time difference is greater than M; information (3) about the transmission time difference comprising: information that the transmission time difference is less than or equal to K or information that the transmission time difference is less than K; information (4) about the transmission time difference comprising: information that the transmission time difference is greater than or equal to M or information that the transmission time difference is greater than M, and information about a value N of the transmission time difference; or information (5) about the transmission time difference comprising: information that the transmission time difference is less than or equal to K or information that the transmission time difference is less than K, and information about a value N of the transmission time difference, wherein N is greater than or equal to 0, M is greater than or equal to 0, and K is greater than or equal to 0,

wherein the determining, by the second device based on the information about the transmission time difference, whether a resource needs to be reserved for the data channel of the first link comprises:

performing a comparison between the transmission time difference and a processing delay, and in response to the comparison, implementing at least one of the following manners:

a scheduling manner (1): in response to the information about the transmission time difference comprising the information (1) about the transmission time difference, and in response to the value N of the transmission time difference being greater than the processing delay of the second device, the second device does not reserve a resource for the data channel of the first link;

and a scheduling manner (2): in response to the information about the transmission time difference comprising the information (1) about the transmission time difference, and in response to the value N of the transmission time difference being less than or equal to the processing delay of the second device, the second device reserves a resource for the data channel of the first link.

2. The method according to claim 1 , wherein the receiving, by a second device, information about a transmission time difference that is sent by a first device comprises: receiving, by the second device in at least one of the following manners, the information about the transmission time difference that is sent by the first device: a receiving manner (1): the second device receives the information (1) about the transmission time difference that is sent by the first device by using higher layer signaling or physical layer signaling; a receiving manner (2): the second device receives the information (2) or (3) about the transmission time difference that is sent by the first device by using higher layer signaling; a receiving manner (3): the second device receives the following information sent by the first device by using higher layer signaling: the information that the transmission time difference is greater than or equal to M or the information that the transmission time difference is greater than M; and the second device receives the information about the value N that is of the transmission time difference and that is sent by the first device by using physical layer signaling; or a receiving manner (4): the second device receives the following information sent by the first device by using higher layer signaling: the information that the transmission time difference is less than or equal to K or the information that the transmission time difference is less than K; and the second device receives the information about the value N that is of the transmission time difference and that is sent by the first device by using physical layer signaling.

3. The method according to claim 1 , wherein the performing, by the second device, scheduling based on the information about the transmission time difference further comprises scheduling, by the second device, a second link based on the information about the transmission time difference, wherein the second link is a link between the second device and a third device, and the third device comprises a terminal or a fourth relay device.

4. The method according to claim 1 , further comprising in response to the comparison, implementing a scheduling manner (4): when the information about the transmission time difference comprises the information (3) or (5) about the transmission time difference, the second device reserves a resource for the data channel of the first link.

5. The method according to claim 1 , further comprising: when the information about the transmission time difference further comprises the value N of the transmission time difference, determining, by the second device, a location of the data channel of the first link based on the value N of the transmission time difference.

6. The method according to claim 3 , wherein the scheduling, by the second device, a second link based on the information about the transmission time difference comprises at least one of the following manners: a scheduling manner (5): if the second device reserves a resource for the data channel of the first link, the second device schedules the second link on a resource other than the reserved resource; or a scheduling manner (6): if the second device does not reserve a resource for the data channel of the first link, the second device dynamically schedules the second link.

7. A second device, comprising: a receiver, configured to receive information about a transmission time difference that is sent by a first device, wherein the transmission time difference is a time difference between a control channel of a first link and a data channel that is of the first link and that is scheduled by the control channel of the first link; the first link comprises a link between the first device and the second device; wherein the first device comprises a base station and the second device comprises a first relay device, or the first device comprises a second relay device and the second device comprises a third relay device; wherein the control channel of the first link comprises a channel used to send control information of a backhaul link on the first link; and the data channel of the first link comprises a channel used to send data on the first link; determining, by the second device based on the information about the transmission time difference, whether to reserve a resource for the data channel of the first link, including performing a comparison between the transmission time difference and a processing delay; and a processor, configured to perform scheduling of a second link based on the information about the transmission time difference, wherein the second link is a link between the second device and a third device, and the third device comprises a terminal or a fourth relay device;

wherein the information about the transmission time difference further comprises at least one of the following: information (1) about the transmission time difference comprising: information about a value N of the transmission time difference; information (2) about the transmission time difference comprising: information that the transmission time difference is greater than or equal to M or information that the transmission time difference is greater than M; information (3) about the transmission time difference comprising: information that the transmission time difference is less than or equal to K or information that the transmission time difference is less than K; information (4) about the transmission time difference comprising: information that the transmission time difference is greater than or equal to M or information that the transmission time difference is greater than M, and information about a value N of the transmission time difference; or information (5) about the transmission time difference comprising: information that the transmission time difference is less than or equal to K or information that the transmission time difference is less than K, and information about a value N of the transmission time difference, wherein N is greater than or equal to 0, M is greater than or equal to 0, and K is greater than or equal to 0;

wherein the processor is configured to determine, in at least one of the following manners, whether the resource needs to be reserved for the data channel of the first link: a scheduling manner (1): in response to the information about the transmission time difference comprises the information (1) about the transmission time difference, and in response to the value N of the transmission time difference being greater than a processing delay of the second device, the processor does not reserve a resource for the data channel of the first link;

and a scheduling manner (2): in response to the information about the transmission time difference comprises the information (1) about the transmission time difference and in response to the value N of the transmission time difference being less than or equal to a processing delay of the second device, the processor reserves a resource for the data channel of the first link.

8. The device according to claim 7 , wherein the receiver is configured to receive, in at least one of the following manners, the information about the transmission time difference that is sent by the first device: a receiving manner (1): the receiver receives the information (1) about the transmission time difference that is sent by the first device by using higher layer signaling or physical layer signaling; a receiving manner (2): the receiver receives the information (2) or (3) about the transmission time difference that is sent by the first device by using higher layer signaling; a receiving manner (3): the receiver receives the following information sent by the first device by using higher layer signaling: the information that the transmission time difference is greater than or equal to M or the information that the transmission time difference is greater than M; and the receiver receives the information about the value N that is of the transmission time difference and that is sent by the first device by using physical layer signaling; or a receiving manner (4): the receiver receives the following information sent by the first device by using higher layer signaling: the information that the transmission time difference is less than or equal to K or the information that the transmission time difference is less than K; and the receiver receives the information about the value N that is of the transmission time difference and that is sent by the first device by using physical layer signaling.

9. The device according to claim 7 , wherein the processor is configured to: determine, based on the information about the transmission time difference, whether a resource needs to be reserved for the data channel of the first link, and/or schedule a second link based on the information about the transmission time difference, wherein the second link is a link between the second device and a third device, and the third device comprises a terminal or a fourth relay device.

10. The device according to claim 7 , wherein the processor is further configured to determine-whether the resource needs to be reserved for the data channel of the first link by: a scheduling manner (4): when the information about the transmission time difference comprises the information (3) or (5) about the transmission time difference, the processor reserves a resource for the data channel of the first link.

11. The device according to claim 7 , wherein the processor is configured to schedule the second link in at least one of the following manners: a scheduling manner (5): if the processor reserves a resource for the data channel of the first link, the processor schedules the second link on a resource other than the reserved resource; or a scheduling manner (6): if the processor does not reserve a resource for the data channel of the first link, the processor dynamically schedules the second link.