MULTI-LINK COMMUNICATION METHOD AND MULTI-LINK DEVICE

1 . A multi-link communication method, wherein a multi-link device receives a second aggregated medium access control protocol data unit A-MPDU over a first link, and receives a first A-MPDU over a second link, wherein the first A-MPDU and the second A-MPDU have a same traffic identifier, and the first A-MPDU is received before the second A-MPDU; and

the method comprises:

determining, by the multi-link device, a start sequence number or an end sequence number of a scoreboard on the first link based on the first A-MPDU received over the second link; and

sending, by the multi-link device, a first block acknowledgment frame over the first link based on the start sequence number or the end sequence number of the scoreboard on the first link and the received second A-MPDU, wherein the first block acknowledgment frame is used to acknowledge a receiving status of the second A-MPDU.

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

determining, by the multi-link device, a start sequence number or an end sequence number of a scoreboard on the second link based on the first A-MPDU received over the second link; and

sending, by the multi-link device, a second block acknowledgment frame over the second link based on the start sequence number or the end sequence number of the scoreboard on the second link and the received first A-MPDU, wherein the second block acknowledgment frame is used to acknowledge a receiving status of the first A-MPDU.

3 . The method according to claim 1 , wherein a window size of the scoreboard on the first link is the same as a window size of the scoreboard on the second link.

4 . The method according to claim 1 , wherein the multi-link device comprises a first receiving device on the first link and a second receiving device on the second link; and

the determining, by the multi-link device, a start sequence number or an end sequence number of a scoreboard on the first link based on the first A-MPDU received over the second link comprises:

determining, by the first receiving device, a start sequence number or an end sequence number of a scoreboard of the first receiving device based on a start sequence number or an end sequence number of a scoreboard of the second receiving device, wherein

the start sequence number or the end sequence number of the scoreboard of the second receiving device corresponds to the first A-MPDU.

5 . The method according to claim 1 , wherein the multi-link device comprises a first receiving device on the first link and a second receiving device on the second link; and

the determining, by the multi-link device, a start sequence number or an end sequence number of a scoreboard on the first link based on the first A-MPDU received over the second link comprises:

determining, by the first receiving device, a start sequence number or an end sequence number of a scoreboard of the first receiving device based on a start sequence number or an end sequence number of a common scoreboard of the multi-link device, wherein

the start sequence number or the end sequence number of the common scoreboard of the multi-link device is determined based on the first A-MPDU.

6 . The method according to claim 1 , wherein the multi-link device comprises a first receiving device on the first link and a second receiving device on the second link; and

the determining, by the multi-link device, a start sequence number or an end sequence number of a scoreboard on the first link based on the first A-MPDU received over the second link comprises:

receiving, by the first receiving device, a start sequence number sent by a sending device on the first link, wherein the start sequence number is coupled to the first A-MPDU; and

determining, by the first receiving device, a start sequence number or an end sequence number of a scoreboard of the first receiving device based on the start sequence number.

7 . The method according to claim 6 , wherein the start sequence number is carried in an add block acknowledgment request frame or a block acknowledgment request frame.

8 . The method according to claim 1 , wherein the multi-link device comprises a second receiving device on the second link, and the method further comprises:

sending, by the multi-link device, indication information over the second link, wherein the indication information indicates that the second receiving device cannot be synchronized with a start sequence number or an end sequence number of a scoreboard of a receiving device of any link.

9 . The method according to claim 1 , wherein the first block acknowledgment frame of the first A-MPDU is sent before the second A-MPDU is received.

10 . A multi-link device, wherein the multi-link device receives a second aggregated medium access control protocol data unit A-MPDU over a first link, and receives a first A-MPDU over a second link, wherein the first A-MPDU and the second A-MPDU have a same traffic identifier, and the first A-MPDU is received before the second A-MPDU; and

the multi-link device comprises:

a processing unit, configured to determine a start sequence number or an end sequence number of a scoreboard on the first link based on the first A-MPDU received over the second link, wherein

the processing unit is further configured to determine a first acknowledgment frame based on the start sequence number or the end sequence number of the scoreboard on the first link and the received second A-MPDU, wherein the first block acknowledgment frame is used to acknowledge a receiving status of the second A-MPDU; and

a transceiver unit, configured to send the first block acknowledgment frame over the first link.

11 . The multi-link device according to claim 10 , wherein

the processing unit is configured to determine a start sequence number or an end sequence number of a scoreboard on the second link based on the first A-MPDU received over the second link;

the processing unit is configured to determine a second block acknowledgment frame based on the start sequence number or the end sequence number of the scoreboard on the second link and the received first A-MPDU, wherein the second block acknowledgment frame is used to acknowledge a receiving status of the first A-MPDU; and

the transceiver unit is configured to send the second block acknowledgment frame over the second link.

12 . The multi-link device according to claim 10 , wherein a window size of the scoreboard on the first link is the same as a window size of the scoreboard on the second link.

13 . The multi-link device according to claim 10 , wherein the multi-link device comprises a first communication apparatus on the first link and a second communication apparatus on the second link, and the first communication apparatus comprises a processing module;

the processing module is configured to determine a start sequence number or an end sequence number of a scoreboard of the first communication apparatus based on a start sequence number or an end sequence number of a scoreboard of the second communication apparatus; and

the start sequence number or the end sequence number of the scoreboard of the second communication apparatus corresponds to the first A-MPDU.

14 . The multi-link device according to claim 10 , wherein the multi-link device comprises a first communication apparatus on the first link and a second communication apparatus on the second link, and the first communication apparatus comprises a processing module;

the processing module is configured to determine a start sequence number or an end sequence number of a scoreboard of the first communication apparatus based on a start sequence number or an end sequence number of a common scoreboard of the multi-link device; and

the start sequence number or the end sequence number of the common scoreboard of the multi-link device corresponds to the first A-MPDU.

15 . The multi-link device according to claim 10 , wherein the multi-link device comprises a first communication apparatus on the first link and a second communication apparatus on the second link, and the first communication apparatus comprises a processing module and a transceiver module;

the transceiver module is configured to receive a start sequence number sent by a sending device on the first link, wherein the start sequence number is coupled to the first A-MPDU;

the processing module is configured to determine a start sequence number or an end sequence number of a scoreboard of the first communication apparatus based on the start sequence number; and

the start sequence number is coupled to the first A-MPDU.

16 . The multi-link device according to claim 15 , wherein the start sequence number is carried in an add block acknowledgment request frame or a block acknowledgment request frame.

17 . The multi-link device according to claim 10 , wherein the multi-link device comprises a second communication apparatus on the second link; and

the transceiver unit is configured to send indication information over the second link, wherein the indication information indicates that the second communication apparatus cannot be synchronized with a start sequence number or an end sequence number of a scoreboard of a communication apparatus of any link.

18 . The multi-link device according to claim 1 , wherein the first block acknowledgment frame of the first A-MPDU is sent before the second A-MPDU is received.