Patent ID: 9332517
Filing Date: 2016-05-03
CPC Classification: H04J,H04W

Claim Text:
1. A method of transmitting a signal, which is transmitted by an access point in a wireless communication system, comprising: generating a frame for synchronization of a timer of a station associated with the access point; and transmitting the frame for the synchronization, wherein the frame for the synchronization is transmitted before or after every target beacon transmission time, wherein the frame for the synchronization comprises a timestamp field indicating a value of a timer of the access point and an offset field indicating an offset amounting to a difference between the target beacon transmission time and a transmission time of the frame for the synchronization, wherein the offset is determined as a maximum clock error of the timer of the station, wherein the maximum clock error is calculated from a time information of a listen interval field transmitted when the station is associated with the access point, and wherein the time information comprises an interval for the station to awake to receive a beacon frame in power save mode.