Multicast information transmission method and device

An access point (AP), comprising:

• a processor, configured to generate a multicast association identifier (MID) of a multicast group and a delivery traffic indication map (DTIM) beacon frame;
• a transmit circuit, configured to send the MID of the multicast group, the DTIM beacon frame, and multicast information of the multicast group by using an antenna;
• and
• wherein each MID corresponds to one multicast group and a receiving period of a station (STA) in the multicast group, a partial virtual bitmap of the DTIM beacon frame comprises information indicating a MID in one or more pages, different pages comprise different MIDs corresponding to the same multicast group, the different MIDs correspond to a same receiving period of a STA in the multicast group, and the multicast information carries information about the MID or information associated with the MID, and the multicast information is received by the STA.

A multicast information receiving method, comprising:

• receiving, by a station (STA), a multicast association identifier (MID) of a multicast group sent by an access point (AP), wherein each MID corresponds to one multicast group and a receiving period of a station (STA) in the multicast group;
• receiving, by the STA, a delivery traffic indication map (DTIM) beacon frame sent by the AP, wherein a partial virtual bitmap of the DTIM beacon frame comprises information indicating a MID in one or more pages, different pages comprise different MIDs corresponding to the same multicast group, and the different MIDs correspond to a same receiving period of a STA in the multicast group;
• and
• receiving, by the STA, multicast information, sent by the AP, of the multicast group when the STA wakes up, wherein the multicast information carries information about the MID or information associated with the MID.