UNSCHEDULED 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;
transmitting a polling frame to the access point over the WLAN channel, the polling frame identifying the reserved traffic stream and including an aggregation indicator;
in response to transmitting the polling frame, receiving an aggregate response at the mobile station over the WLAN channel, wherein the aggregate response includes at least one frame of data from an aggregate buffer of the access point, the aggregate buffer for buffering both unreserved and reserved data for the mobile station, and wherein receiving the aggregate response continues until the aggregate buffer is empty or a service time period expires; and
upon receiving the aggregate response, 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 unscheduled 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 an aggregate response. The aggregate response commences by transmitting all data in an aggregate buffer, including both reserved and unreserved data buffers. Upon successful receipt of the aggregate response, the mobile station places the WLAN subsystem back into a low power state.
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Citations
24 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;
transmitting a polling frame to the access point over the WLAN channel, the polling frame identifying the reserved traffic stream and including an aggregation indicator;
in response to transmitting the polling frame, receiving an aggregate response at the mobile station over the WLAN channel, wherein the aggregate response includes at least one frame of data from an aggregate buffer of the access point, the aggregate buffer for buffering both unreserved and reserved data for the mobile station, and wherein receiving the aggregate response continues until the aggregate buffer is empty or a service time period expires; and
upon receiving the aggregate response, setting the WLAN subsystem into the low power state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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, the reserved buffer and an unreserved buffer forming an aggregate buffer at the access point wherein unreserved data is buffered in the unreserved buffer;
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 aggregate buffer for buffered data to be sent to the mobile station; and
transmitting an aggregate response to the mobile station over the WLAN channel, the aggregate response being transmitted by the access point and including data in the aggregate buffer, the transmitting continuing until the aggregate buffer is empty or until a service time period is reached. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. 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, the reserved buffer and an unreserved buffer forming an aggregate buffer at the access point wherein unreserved data is buffered in the unreserved buffer;
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 an aggregate response to the mobile station over the WLAN channel, the aggregate response being transmitted by the access point and including data in the aggregate buffer, the transmitting continuing until the aggregate buffer is empty or until a service time period is reached; and
upon receiving the response frame at the mobile station, setting the WLAN subsystem into the low power state. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification