A method of power saving in a wireless local area network, and a wireless apparatus therefore are discussed. The method according to one embodiment includes acquiring a transmission opportunity (TXOP), receiving a signal field, the signal field including a group identifier, a number indicator and a power saving indicator, the group identifier indicating a group of recipients, the number indicator indicating a number of spatial streams, the power saving indicator indicating that the transmitting device allows the wireless device to enter a doze state. The method according to the embodiment further includes entering the doze state until the end of the TXOP if the power saving indicator indicates an allowance of entering the doze state during the TXOP, the wireless device is a member of the group of recipients, and the number of spatial streams to be received by the wireless device is equal to zero.