Embodiments of the present invention provide an information transmission method and a node. The information transmission method provided in the present invention may include: receiving, by a first node, a request message sent by a second node, where the first node and the second node belong to a same BSS; and sending, by the first node, a response message to the second node, where the response message includes an identifier of a BSS to which the first node belongs. The embodiments of the present invention can improve a network throughput.