Method and apparatus for operating a power save mode in a wireless LAN system

摘要

The present invention relates to a method for operating a power save mode in a wireless LAN system. The method involves transmitting a power save multi-poll (PSMP) frame containing a power save mode (PSM) of a non-access point (AP) station (STA) to a first station and to a second station which are paired with an AP on the basis of multiple input multiple output (MIMO) technology. Information on the PSM contains downlink transmission start offset which indicates the point in time of starting a downlink transmission period, a downlink transmission duration which indicates the duration of the downlink transmission period, and transmission object station identification information. The method further involves transmitting a data frame to the first station and to the second station on the basis of the MIMO technology during the downlink transmission period. The transmission object station identification information indicates a group identifier (group ID) for indicating an object station group including the first station and the second station, which are object stations to which the AP transmits the data frame on the basis of the MIMO technology.

主权项

1. A method for operating a power save mode (PSM) in a wireless local area network (WLAN) system, the method comprising:
transmitting, by an access point (AP), station allocation information for indicating an uplink time and a downlink time to at least one station, the station allocation information including an indication subfield indicating whether any subfield for a multi-user (MU) group is included in the station allocation information; and transmitting, by the AP, a data frame to the at least one station at the downlink time indicated by the station allocation information, wherein, if the indication subfield is set to a first value, the station allocation information includes a group subfield and a start offset subfield, the group subfield indicating a group of stations for receiving the data frame from the AP through a multi-user multiple input multiple output (MU-MIMO) transmission scheme, and the start offset subfield indicating a starting time to be accessed by the group of stations, wherein the station allocation information further includes a type subfield indicating that the indication subfield is present.