Abstract: The present disclosure relates to a data transfer method. First, a transmitting index of a file is generated on a data transmitting device using a transmitting data block and a size of the file. The transmitting index is then transmitted to a data receiving device. The data receiving device confirms if the transmitting index matches with one of a plurality of receiving indexes stored in the data receiving device. The plurality of receiving indexes respectively represents a plurality of receiving files stored on the data receiving device. The file is transferred from the data transmitting device to the data receiving device when the transmitting index matches none of the plurality of receiving indexes. The file is not transferred when the transmitting index matches one of the plurality of receiving indexes.

Abstract: The present invention provides a location-based service delivering system and method for at least one person carrying a mobile device that can allow the delivery of location-based services without using the earth coordinates. The location-based service delivering system comprises: at least one energy-emitting unit, a tagging unit, at least one display unit, and a control unit. The energy-emitting unit is utilized for emitting at least one energy signal, wherein the mobile device generates at least one sensing signal by sensing the energy signal emitted from the energy-emitting unit. The tagging unit is coupled to the mobile device, and utilized for generating at least one tag associated with the person carrying the mobile device according to the sensing signal. The control unit is coupled to the tagging unit and the display unit, and utilized for controlling the display unit to display information according to the tag generated by the tagging unit.

Abstract: The present invention provides a location-based service delivering system and a location-based service delivering method for at least one person carrying a mobile device that can allow the delivery of location-based services without using the earth coordinates. The location-based service delivering system comprises: at least one sensing unit, a tagging unit, at least one display unit, and a control unit. The sensing unit is utilized for generating at least one sensing signal by sensing at least one energy signal emitted from the energy-emitting mobile device. The tagging unit is coupled to the sensing unit, and utilized for generating at least one tag associated with the person carrying the energy-emitting mobile device according to the sensing signal. The control unit is coupled to the tagging unit and the display unit, and utilized for controlling the display unit to display information according to the tag generated by the tagging unit.