Patent ID: 9426630
Filing Date: 2016-08-23
CPC Classification: H04W

Claim Text:
1. A method for transmitting multicast frames by a transmitter in a wireless local area network, the method comprising: receiving, by the transmitter, a first directed multicast service (DMS) request frame from a first receiver, the first DMS request frame including a request type field for a request of a unicast transmission of a multicast frame; receiving, by the transmitter, a second DMS request frame from a second receiver, the second DMS request frame including the request type field for the request of the unicast transmission of the multicast frame; transmitting, by the transmitter, a DMS response frame to the first receiver and the second receiver, the DMS response frame including a response type field, a group identifier field, and a TCLAS element field, the response type field indicating whether the request of the unicast transmission of the multicast frame is accepted for the first receiver and the second receiver, the group identifier field including a group identifier indicating each of the first receiver and the second receiver receiving the multicast frame by the unicast transmission, and the TCLAS element field including a multicast address for the multicast frame corresponding to the group identifier; and performing, by the transmitter, the unicast transmission for a physical layer convergence procedure (PLCP) protocol data unit (PPDU) carrying the multicast frame based on a multiple user (MU)-multiple input multiple output (MIMO) to each of the first receiver and the second receiver, the PPDU including a VHT-SIG A field including the group identifier, wherein the first receiver determines whether the PPDU is the multicast frame transmitted by the unicast transmission based on the group identifier included in the VHT-SIG A field, and wherein the first receiver determines the multicast address based on the group identifier included in the VHT-SIG A field and the multicast address corresponding to the group identifier included in the TCLAS element field when the first receiver determines that the PPDU is the multicast frame transmitted by the unicast transmission.