Patent ID: 8477670

Claim:
A wireless communication method of a wireless communication device to which a power management mode of a wireless LAN is applied and to which a parent device communicates, the method comprises: updating a listen interval of receiving a beacon signal from a parent device to be shorter than a current listen interval in response to a data transmission to the parent device; and periodically increasing the updated listen interval between the time span from the data transmission to a next data transmission, wherein reception of the beacon signal is carried out after switching from a doze state to an awake state, wherein the wireless communication device stores an information table defining three or more levels of interval of receiving the beacon signal from the parent device after switching from the doze state to the awake state; updates the current listen interval to the shorter listen interval according to the information table in response to the data transmission to the parent device; and periodically increases the updated listen interval to follow the levels of the information table, and wherein the information table has the three or more levels according to the time elapsed since the data transmission to the parent device, the method further comprising: detecting the timings of transmission of beacon signals by the parent device to count the total number of times of detections; reducing the value of the total number at each data transmission to the parent device; recognizing the revised value of the total number after the reduction as the elapsed time; and recognizing the revised listen interval of the level corresponding to the recognized elapsed time as the updated listen interval.