Method for power saving in wireless local area network and apparatus for the same

A wireless apparatus comprising:

• a transceiver configured to transmit and receive a radio signal;
• and
• a processor operatively coupled to the transceiver and configured to:
• acquire a transmission opportunity (TXOP) from a transmitting device,
• receive a signal field from the transmitting device, 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 for a corresponding recipient, the power saving indicator indicating that the transmitting device allows the wireless device to enter a doze state during the TXOP, and
• enter 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 indicated by the group identifier, and
• the number of spatial streams to be received by the wireless device is equal to zero.