METHOD AND DEVICE FOR TRANSMITTING SPATIAL FLOW APPLICABLE TO MU-MIMO IN A WIRELESS LOCAL NETWORK SYSTEM

摘要

1. A method of transmitting data through a transmitter that implements multi-user communication with multiple inputs / outputs (MU-MIMO) of the transmitter) to a receiver in a wireless LAN, the method comprising the steps of: transmitting a control frame by means of a MU-MIMO transmitter, including group information to assign or change a position of a receiver spatial stream in at least one of a plurality of groups; and the group information includes a plurality of group indicators and a plurality of spatial flow indicators (SS), each of this plurality of group indicators indicating whether or not the receiver is a member of a corresponding group, each of this plurality of SS indicators indicating a spatial stream position appropriate group. 2. The method of claim 1, wherein the group information includes information for assigning or changing a position of more than one receiver spatial stream in at least one of the plurality of groups. The method of claim 1, wherein each of said plurality of SS indicators indicates the position of the spatial stream among the four spatial streams. The method of claim 1, further comprising the step of: transmitting, using the MU-MIMO transmitter, a frame including a spatial stream in accordance with group information. The method of claim 4, wherein the frame further includes a header that includes a group identifier field indicating a membership group from the plurality of groups, the receiver being a member of the membership group. The method of claim 5, wherein the frame is transmitted before