Patent ID: 9397737
Filing Date: 2016-07-19
CPC Classification: H04B,H04L,H04W

Claim Text:
1. A method for a wireless local area network supporting multi-user multiple input multiple output (MU-MIMO), the method comprising: transmitting, by a station, an association request frame to an access point (AP), the association request frame for requesting an association with the AP and including capability information indicating that the station supports receiving a very high throughput (VHT) control field; receiving, by the station, an association response frame from the AP in response to the association request frame; receiving, by the station, a Physical layer Protocol Data Unit (PPDU) from the AP, the PPDU including a group identifier that identifies a plurality of stations to receive the PPDU; and transmitting, by the station, a medium access control (MAC) frame to the AP, the MAC frame including a control bit, a modulation and coding scheme (MCS) feedback field and the VHT control field, the control bit having a length of one bit and being set to one to indicate that the MAC frame includes the VHT control field, the VHT control field of the MAC frame including a multi-user (MU) information, the MCS feedback field indicating a recommended MCS, wherein: the MU information is set to a predefined value when the PPDU is transmitted by the AP via a single-user MIMO (SU-MIMO) transmission; and the MU information is set to a same value as the group identifier of the PPDU when the PPDU is transmitted by the AP via a MU-MIMO transmission in order to indicate that the recommended MCS is estimated from the PPDU that includes the group identifier.