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METHOD FOR ACQUIRING POSITIONAL INFORMATION ON A WIRELESS TERMINAL BY PERIODICALLY TRANSMITTING A DATA TRANSMISSION REQUEST

  • US 20070086399A1
  • Filed: 08/16/2006
  • Published: 04/19/2007
  • Est. Priority Date: 08/16/2005
  • Status: Abandoned Application
First Claim
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1. A method for acquiring positional information on a wireless terminal station in a wireless communication system, comprising the steps of:

  • preparing a wireless communication system including an access point and a plurality of wireless terminal stations communicating with the access point;

    transmitting a beacon frame from the access point at a predetermined interval;

    setting the wireless terminal stations to a power-saving mode;

    allowing the wireless terminal stations to enter a normal-operation mode at a timing of the beacon frame being transmitted to receive the beacon frame;

    transmitting from the access point the beacon frame including stored-data information indicating presence of stored data addressed to one of the wireless terminal stations which is set to the power-saving mode, regardless of whether or not the stored data exists;

    sending a stored-data transmission request from the one wireless terminal station to the access point when the stored-data information in the beacon frame indicates the presence of the stored data addressed to the one wireless terminal station;

    receiving the stored-data information by the one wireless terminal station, and transmitting a stored data transmission request to the access point;

    receiving the stored data transmission request by the access point, and recognizing the presence of the one wireless terminal station;

    transmitting from the access point the stored data if the stored data actually exists, or dummy data if no data is stored;

    receiving the stored data or the dummy data transmitted from the access point by the one wireless terminal station;

    allowing the one wireless station to return to the power-saving mode;

    allowing the access point to determine, when failing to receive the stored data transmission request from the one wireless terminal station within a predetermined period of time after transmitting the beacon frame, that the one wireless terminal station has moved out of a wireless service area of the access point; and

    deleting registration of the one wireless terminal station from the access point.

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