Patent ID: 7747273
Filing Date: 2010-06-29
Classification: H04W,Y02D

Abstract:
1. An asynchronous power management method for use in a first station and a second station in a wireless ad hoc network, comprising: determining an SRI (Schedule Repetition Interval) value, in which the SRI defines an awake/sleep schedule, the unit of the SRI value is a BI (Beacon Interval), the SRI value is an odd prime number, and the second station repeats the awake/sleep schedule at regular intervals based on the value of the SRI; determining a number of ABIs (Awake Beacon Intervals) and positions thereof within the SRI, in which the positions of the ABIs in the SRI form a cyclic difference set comprising at least two consecutive ABIs; within every BW (Beacon Window), the second station transmitting a beacon frame, wherein the beacon frame comprises the BI number of the current BI in an SRI, and a bitmap of the set of ABIs in the SRI; the first station receiving the beacon frame from the second station, determining whether the second station is currently in an ABI according to the beacon frame; and if so, transmitting data frames to the second station during the ABI of the second station.