Method for updating a timer function in a mobile station in a wireless local area network
First Claim
1. A method for updating a timer function in a mobile station in a wireless local area network, comprising:
- receiving from the mobile station at an access point a trigger frame for servicing a traffic stream in a present service period; and
transmitting to the mobile station from the access point a response sequence, including a timer value that is at least a portion of a present value of a timer function of the access point.
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Accused Products
Abstract
A mobile station (204) in a wireless local area network is associated with an access point (202), which controls timing of certain transmissions, such as beacons (402). The mobile station has a timer (108) that is driven by a high frequency clock source (110) while operating in an active mode, and a low frequency clock source (112) when in a low power mode, to conserve battery charge. To prevent timing errors from significantly affecting the accuracy for the timer (108) upon transitioning from one mode to the other, access point transmits timing information to the mobile station in the course of servicing requests from the mobile station. The timing information is included in a response sequence (300).
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Citations
18 Claims
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1. A method for updating a timer function in a mobile station in a wireless local area network, comprising:
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receiving from the mobile station at an access point a trigger frame for servicing a traffic stream in a present service period; and
transmitting to the mobile station from the access point a response sequence, including a timer value that is at least a portion of a present value of a timer function of the access point. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for updating a timer function in a mobile station in a wireless local area network, comprising:
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transmitting from the mobile station to an access point a trigger frame for initiating a present service period for servicing a traffic stream;
receiving at the mobile station from the access point a response sequence, including a timer value that is at least a portion of a present value of a timer function of the access point; and
updating a local timer of the mobile station with the timer value. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for updating a timer function in a mobile station in a wireless local area network, comprising:
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waking up a wireless local area network subsystem of the mobile station from a low power mode, and wherein a low frequency clock source is used for driving a local timer while in the low power mode;
upon waking up from the low power mode to an active mode, switching to a high frequency clock source for driving the local timer during the active mode;
transmitting from the mobile station to an access point a trigger frame for initiating a present service period for servicing a traffic stream;
receiving at the mobile station from the access point a response sequence, including a timer value that is at least a portion of a present value of a timer function of the access point;
updating the local timer with the timer value; and
reentering the low power mode, and switching to the low frequency clock source for driving the local timer. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification