Multi-link communication method and related apparatus

A multi-link device, serving as a transmit end of multi-link aggregation transmission, the device comprising:

• a transceiver configured to send a data frame over a plurality of links between the transceiver and a receive end, wherein the plurality of links comprises a first link, and
• the transceiver is further configured to send a block acknowledgment request (BAR) frame over the first link;
• and
• a processor, configured to parse a starting sequence number (SSN_1) that is carried in the BAR frame and that corresponds to the first link, wherein the SSN_1 is a sequence number of a next data frame to be sent over the first link, or the SSN_1 is greater than a sequence number of a data frame discarded by the transmit end over the first link.

A chip system, comprising:

• at least one processor;
• and
• an interface that is configured to:
• output a data frame to be sent over a plurality of links between the transmit end and a receive end, wherein the plurality of links comprises a first link;
• and
• output a block acknowledgment request (BAR) frame to be sent over the first link, wherein the BAR frame carries a starting sequence number (SSN_1) corresponding to the first link, and the SSN_1 is a sequence number of a next data frame to be sent over the first link, or the SSN_1 is greater than a sequence number of a data frame discarded by the transmit end over the first link.