The present invention relates to a multicast method and apparatus in an IEEE 802.11n wireless LAN, including an access point (AP) apparatus 10; And a user terminal 20 communicating with the connection point device 10 via a wireless LAN (WL). An MCS selection step (step S2); A transmission timing determination step (S3 step); A first random phase signal transmission step (S4); And the second random phase signal transmission step (step S5). Thus, unlike the conventional techniques, the A-MPDU characteristics are sufficiently considered and the characteristics of the orthogonal frequency division multiplexing (OFDM) A plurality of multicast clients can simultaneously transmit a plurality of feedback information to the AP without any collision, thereby enabling a wireless multicast having a reliability level of 100% with a very small amount of control overhead, unlike the conventional techniques, Based on USRP / GNU Radio based software defined radio (SDR) platform, the proposed technique can be implemented realistically by improving the spectrum efficiency by adaptively adjusting transmission MCS according to the channel status of multicast clients. Performance evaluation through the network simulator ns-2. Method of wireless multicast and a recently proposed wireless multicast technique.
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