Patent ID: 9572102
Date: 2017-02-14
CPC Classifications: H04W,Y02D

Claim:
1. A method of computing a start of a next awake interval of a wireless station, wherein said wireless station is designed to set one or more circuit portions comprised in said wireless station in a low-power mode between awake intervals, wherein said wireless station is designed to receive beacons from an access point (AP) in awake intervals, said method being performed in said wireless station, said method comprising: receiving a packet from said AP in a previous awake interval of said wireless station, wherein said packet contains a field having a first time value representing time maintained at said AP; computing a difference between said first time value and a second time value, wherein said second time value represents a local time maintained using a local clock of said wireless station, wherein said difference represents a drift between said time maintained at said AP and said local time; computing a sleep duration by adding an error to a pre-specified duration, wherein said error has a positive correlation to said pre-specified duration and said difference, wherein said difference is multiplied by said pre-specified duration in computing said error; placing said one or more circuit portions in said low power mode for said sleep duration using said local clock; and powering-ON said one or more circuit portions at the end of said sleep duration.