Communication method in wireless local area network system

A wireless apparatus operated in a Wireless Local Area Network (WLAN) system, the wireless apparatus comprising:

• a transceiver configured to transmit and receive radio signals;
• and
• a processor functionally connected to the transceiver, wherein the process is configured to:
• receive a relayed Traffic Indication Map (TIM) message from a relay station, wherein the TIM message comprises a relayed TIM field indicating whether or not there is buffered traffic intended to be transmitted from an Access Point (AP) to the wireless apparatus;
• determine whether or not there is the buffered traffic based on the relayed TIM field;
• receive a data frame related to the buffered traffic, if the relayed TIM field indicates that there is the buffered traffic;
• and
• switch to a doze state, if the relayed TIM field indicates that there is no buffered traffic,
• wherein the relayed TIM field is determined based on a TIM element transmitted from the AP to the relay station,
• the TIM element is transmitted in a first period in which communication between the relay station and the AP is permitted, and
• the relayed TIM message is transmitted in a second period in which communication between the relay station and the wireless apparatus is permitted.