Uplink poll-based power save delivery method in a wireless local area network for real time communication
First Claim
1. A method of performing power save operation in a wireless local area network (WLAN) by a mobile station while performing voice communications, comprising:
- admitting a reserved traffic stream at an access point, including establishing a reserved buffer at the access point for buffering data corresponding to the reserved traffic stream to be transmitted to the mobile station;
waking up a WLAN subsystem of the mobile station from a low power state;
acquiring a WLAN channel between the mobile station and the access point;
transmitting a polling frame to the access point over the WLAN channel, the polling frame identifying the reserved traffic stream;
in response to transmitting the polling frame, receiving a response frame at the mobile station over the WLAN channel, the response frame being transmitted by the access point and identifying the reserved traffic stream; and
upon receiving the response frame, setting the WLAN subsystem into the low power state.
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Accused Products
Abstract
A mobile station (106) establishes a real time communication link via an access point (102) for carrying voice or other time-sensitive data. A WLAN subsystem (204) of the mobile station is normally kept in a low power state. Upon initiating a communication link the mobile station signals to the access point that uplink poll-based power save delivery mode will be used (614), and the access point reserves resources to assure the necessary quality of service. The mobile station initiates a frame transaction by first powering up the WLAN subsystem (712), acquiring the WLAN channel (407), and transmitting a polling frame. Upon successful receipt of the polling frame the access point prepares to reply with a response frame at an unspecified time within service window, during which time the mobile station maintains the WLAN subsystem power up and ready to receive the response frame. Upon successful receipt of the response frame, the mobile station places the WLAN subsystem back into a low power state.
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Citations
23 Claims
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1. A method of performing power save operation in a wireless local area network (WLAN) by a mobile station while performing voice communications, comprising:
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admitting a reserved traffic stream at an access point, including establishing a reserved buffer at the access point for buffering data corresponding to the reserved traffic stream to be transmitted to the mobile station;
waking up a WLAN subsystem of the mobile station from a low power state;
acquiring a WLAN channel between the mobile station and the access point;
transmitting a polling frame to the access point over the WLAN channel, the polling frame identifying the reserved traffic stream;
in response to transmitting the polling frame, receiving a response frame at the mobile station over the WLAN channel, the response frame being transmitted by the access point and identifying the reserved traffic stream; and
upon receiving the response frame, setting the WLAN subsystem into the low power state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of facilitating power save operation by an access point in a wireless local area network (WLAN) by a mobile station while performing voice communications, comprising:
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admitting a reserved traffic stream at the access point, including establishing a reserved buffer at the access point for buffering data corresponding to the reserved traffic stream to be transmitted to the mobile station;
receiving a polling frame at the access point over the WLAN channel from the mobile station, the polling frame identifying the reserved traffic stream;
checking the reserved buffer for buffered data corresponding to the reserved traffic stream to be sent to the mobile station;
acquiring a WLAN channel between the mobile station and the access point, performed by the access point; and
transmitting a response frame to the mobile station over the WLAN channel, the response frame being transmitted by the access point and identifying the reserved traffic stream. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of performing power save operation is a wireless local area network (WLAN) having at least one mobile station and at least one access point, the method comprising:
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admitting a reserved traffic stream at the access point, including establishing a reserved buffer at the access point for buffering data corresponding to the reserved traffic stream to be transmitted to the mobile station;
indicating to the access point by the mobile station that the mobile station will use power save mode;
placing a WLAN subsystem of the mobile station in a low power state;
waking up the WLAN subsystem of the mobile station from a low power state in response to the occurrence of a service interval timer event, the service interval timer for timing a service interval, the service interval defining a real time duration of a voice frame;
acquiring a WLAN channel between the mobile station and the access point, performed by the mobile station after waking up the WLAN subsystem from the low power state;
transmitting a polling frame over the WLAN channel from the mobile station upon acquiring the WLAN channel, the polling frame identifying the reserved traffic stream;
acquiring the WLAN channel, performed by the access point after checking the reserved buffer;
transmitting a response frame to the mobile station over the WLAN channel, the response frame being transmitted by the access point and identifying the reserved traffic stream; and
upon receiving the response frame at the mobile station, setting the WLAN subsystem into the low power state. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification