Patent ID: 9113479
Filing Date: 2015-08-18
Classification: H04W

Abstract:
1. A method of transmitting a multicast frame in a wireless communication system, the method comprising: transmitting, by a transmitting station to a receiving station, a clear-to-send (CTS) type frame to inform the receiving station about an impending transmission of multicast frames; transmitting, by the transmitting station to the receiving station, a first multicast frame of the multicast frames by using a first antenna configuration after transmitting the CTS type frame; and transmitting, by the transmitting station to the receiving station, a second multicast frame of the multicast frames by using a second antenna configuration that is different from the first antenna configuration, wherein the second multicast frame is a copy of the first multicast frame, wherein the second multicast frame uses a sequence number that is the same as the first sequence number in order enable the receiving station to filter out a duplicated multicast frame, and wherein the CTS type frame includes a transmitter address field and a transmissions mode field, the address field including an address of the transmitting station that transmits the CTS type frame, the transmission mode field consisting of a single bit indicating whether at least one multicast frame is to be transmitted by the transmitting station.