| 摘要 |
<p>A method for acquiring positional information on a wireless terminal station set to its power-saving mode. The access point uses stored-data information in a beacon frame to inform the station applied with the power-saving mode of the presence of stored data regardless of whether or not the stored data exists. The station involved in its dose condition will enter its awake condition immediately before the beacon frame timing to receive a beacon frame. The station then checks the stored-data information and transmits a stored-data request frame to the access point. The access point transmits a data frame if stored data exists, or transmits a null frame if no data is stored. If no stored-data request frame is received within a predetermined time period, the access point determines that the station has moved out of its service area, cancels the registration of the station, and deletes the stored data, if any.</p> |
