Data processing method and related device

1. A data processing method, comprising:

determining, by a second device, in response to a first device switching from the second device to a third device, data receiving status information of the first device; and

reporting, by the second device, to a parent node of the second device, the data receiving status information of the first device according to a maintained mapping relationship, wherein the maintained mapping relationship is a correspondence between a data packet number of data sent by the second device to the first device and a data packet number of data received from the parent node of the second device, wherein the reporting the data receiving status information of the first device comprises sending, by the second device, in response to at least one device existing on a link between the second device and a fourth device, a first status message to the parent node of the second device, the first status message causing the parent node of the second device to report the data receiving status information of the first device to the fourth device based on the first status message, wherein the first status message carries the data receiving status information of the first device, and wherein the data receiving status information instructs the fourth device to send data to the first device according to the data receiving status information.

2. The method according to claim 1 , wherein the data receiving status information indicates, in data sent by the fourth device to the first device through the second device, information about data that has been received by the second device but has not been acknowledged as received by the first device.

3. The method according to claim 1 , wherein the fourth device is connected to a core network device, and the second device and the third device are respectively connected to the core network device by the fourth device.

4. The method according to claim 1 , wherein the parent node of the second device is a device that is one-hop closer to the fourth device than the second device among devices that are directly connected to the second device.

5. The method according to claim 4 , wherein the sending the first status message to the parent node of the second device comprises:

sending, by the second device, the first status message to the parent node of the second device wherein the data packet number of data sent by the second device is a Packet Data Convergence Protocol (PDCP) layer count value of the data sent by the second device.

6. A device, comprising:

a communications interface;

a processor; and

a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to:

determine data receiving status information of a first device in response to the first device switching from the device to a third device; and

cause the communications interface to report, to a parent node of the device, the data receiving status information of the first device according to a maintained mapping relationship, wherein the maintained mapping relationship is a correspondence between a data packet number of data sent by the device to the first device and a data packet number of data received from the parent node of the device, wherein the instructions to cause the communications interface to report the data receiving status information of the first device include instructions to send a first status message to the parent node of the device, the first status message causing the parent node of the device to report the data receiving status information of the first device to a fourth device according to the first status message, wherein the first status message carries the data receiving status information of the first device, and wherein the data receiving status information instructs the fourth device to send data to the first device according to the data receiving status information.

7. The device according to claim 6 , wherein the data receiving status information indicates, in data sent by the fourth device to the first device through the device, information about data that has been received by the device but has not been acknowledged as received by the first device.

8. The device according to claim 6 , wherein the fourth device is connected to a core network device, and wherein the device and the third device are respectively connected to the core network device by the fourth device.

9. The device according to claim 6 , wherein the parent node of the device is a device that is one-hop closer than the device to the fourth device among devices that are directly connected to the device.

10. The device according to claim 9 , wherein the instructions to send the first status message to the parent node include instructions to:

send the first status message to the parent node of the device, wherein the data packet number of data sent by the device is a Packet Data Convergence Protocol (PDCP) layer count value of the data sent by the device.

11. A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores program code for execution by a processor, the program including instructions for:

determining, by a second device, in response to a first device switching from the second device to a third device, data receiving status information of the first device; and

reporting, by the second device, to a parent node of the second device, the data receiving status information of the first device according to a maintained mapping relationship, wherein the maintained mapping relationship is a correspondence between a data packet number of data sent by the second device to the first device and a data packet number of data received from the parent node of the second device, wherein the instructions for reporting the data receiving status information of the first device include instructions for sending, by the second device, in response to at least one device existing on a link between the second device and a fourth device, a first status message to the parent node of the second device, the first status message causing the parent node of the second device to report the data receiving status information of the first device to the fourth device according to the first status message, wherein the first status message carries the data receiving status information of the first device, and wherein the data receiving status information instructs the fourth device to send data to the first device according to the data receiving status information.

12. The non-transitory computer-readable storage medium according to claim 11 , wherein the data receiving status information indicates, in data sent by the fourth device to the first device through the second device, information about data that has been received by the second device but has not been acknowledged as received by the first device.

13. The computer-readable storage medium according to claim 11 , wherein the fourth device is connected to a core network device, and wherein the second device and the third device are respectively connected to the core network device by the fourth device.

14. The computer-readable storage medium according to claim 11 , wherein the parent node of the second device is a device that is one-hop closer than the second device to the fourth device among devices that are directly connected to the second device.

15. The computer-readable storage medium according to claim 14 , wherein the instructions for sending the first status message to the parent node include instructions for:

sending, by the second device, the first status message to the parent node of the second device, wherein the data packet number of data sent by the second device is a Packet Data Convergence Protocol (PDCP) layer count value of the data sent by the second device.