Power saving method in wireless LAN system for estimating at terminal station whether or not data destined thereto is buffered in base station
First Claim
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1. A power saving method in a wireless LAN system, comprising:
- a first step at which, upon receipt of a beacon signal from a base station to which a terminal station is subordinate, said terminal station extracts TIM information from the beacon signal, said TIM information indicating whether or not said base station contains data destined to said terminal station, and stores the extracted TIM information in a memory; and
a second step at which said terminal station references a log of the TIM information stored in said memory to determine based on the log of the TIM information whether or not said terminal station transmits a PS-Poll signal for prompting said base station to transmit data destined to said terminal station at a timing at which said terminal station transmits the PS-Poll signal to said base station, said transmission timing being asynchronous to the timing at which said terminal station receives the beacon signal.
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Abstract
A power saving method in a wireless LAN system is disclosed for estimating at a terminal station whether or not data destined thereto is buffered in a base station, and temporarily stopping a downlink data receiving operation when it is estimated that no such data is buffered, thereby preventing the consumption of a bandwidth for needless wireless frame sequences. Upon receipt of a beacon management frame Beacon (TIM) from the base station, the terminal station stores TIM information in a memory. The TIM information indicates whether or not downlink data destined to the terminal station is buffered in the base station (indicating that the data is buffered when it is at “1” and that the data is not buffered when it is at “0”). At a PS-Poll transmission timing, the terminal station references the memory and stops the transmission of PS-Poll when the two latest values of TIM are “00.”
20 Citations
17 Claims
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1. A power saving method in a wireless LAN system, comprising:
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a first step at which, upon receipt of a beacon signal from a base station to which a terminal station is subordinate, said terminal station extracts TIM information from the beacon signal, said TIM information indicating whether or not said base station contains data destined to said terminal station, and stores the extracted TIM information in a memory; and
a second step at which said terminal station references a log of the TIM information stored in said memory to determine based on the log of the TIM information whether or not said terminal station transmits a PS-Poll signal for prompting said base station to transmit data destined to said terminal station at a timing at which said terminal station transmits the PS-Poll signal to said base station, said transmission timing being asynchronous to the timing at which said terminal station receives the beacon signal. - View Dependent Claims (2, 3, 4)
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5. A power saving method in a wireless LAN system, comprising:
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a third step at which, upon receipt of a beacon signal from a base station to which a terminal station is subordinate, said terminal station extracts TIM information from the beacon signal, said TIM information indicating whether or not said base station contains data destined to said terminal station, and stores the extracted TIM information in a memory;
a fourth step at which said terminal station stores data reception information indicating whether or not said terminal station has received the data destined thereto in said memory as a response to a PS-Poll signal transmitted to said base station at a transmission timing for prompting said base station to transmit the data. destined to said terminal station, said transmission timing being asynchronous to a timing at which said terminal station receives the beacon signal; and
a fifth step at which said terminal station references a log of the TIM information or the data reception information stored in said memory at the transmission timing to determine based on the log whether said terminal station transmits the PS-Poll signal or stops the transmission of the PS-Poll signal. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A terminal station having a power saving function which operates asynchronously to a timing at which said terminal station receives a beacon signal from a base station to which said terminal station is subordinate in a wireless LAN system, said terminal station comprising:
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a memory;
means responsive to the beacon signal received from said base station for extracting TIM information from the beacon signal, said TIM information indicating whether or not said base station contains data destined to said terminal station, and storing the TIM information in said memory; and
means for referencing a log of the TIM information stored in said memory to determine based on the log whether a PS-Poll signal for prompting said base station to transmit data destined to said terminal station is transmitted or stopped at a timing at which said terminal station transmits the PS-Poll signal to said base station, said transmission timing being asynchronous to a timing at which said terminal station receives the beacon signal. - View Dependent Claims (15)
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13. A terminal station having a power saving function which operates asynchronously to a timing at which said terminal station receives a beacon signal from a base station to which said terminal station is subordinate in a wireless LAN system, said terminal station comprising:
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a memory;
means for storing data reception information indicating whether or not said terminal station has received data destined thereto in said memory as a response to a PS-Poll signal transmitted to said base station for prompting said base station to transmit data destined to said terminal station at a transmission timing asynchronous to a timing at which said terminal station receives the beacon signal; and
means for referencing a log of the data reception information stored in said memory to determine based on the log whether the PS-Poll signal is transmitted or stopped at the transmission timing. - View Dependent Claims (16)
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14. A terminal station having a power saving function which operates asynchronously to a timing at which said terminal station receives a beacon signal from a base station to which said terminal station is subordinate in a wireless LAN system, said terminal station comprising:
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a memory;
means responsive to the beacon signal received from said base station for extracting TIM information from the beacon signal, said TIM information indicating whether or not said base station contains data destined to said terminal station, and storing the TIM information in said memory;
means for storing data reception information indicating whether or not said terminal station has received data destined thereto in said memory as a response to a PS-Poll signal transmitted to said base station for prompting said base station to transmit data destined to said terminal station at a transmission timing asynchronous to a timing at which said terminal station receives the beacon signal; and
means for referencing a log of the TIM information or the data reception information stored in said memory to determine based on the referenced log whether the PS-Poll signal is transmitted or stopped at the transmission timing. - View Dependent Claims (17)
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Specification
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Current AssigneeNEC Corporation
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Original AssigneeNEC Corporation
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InventorsMorimoto, Shinichi, Omori, Youko
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Application NumberUS11/155,769Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current455/574CPC Class CodesH04W 28/14 using intermediate storageH04W 52/0229 where the received signal i...H04W 74/06 using pollingH04W 84/12 WLAN [Wireless Local Area N...Y02D 30/70 in wireless communication n...
