Patent ID: 8738026

Claim:
A wireless transmission system, comprising: a plurality of candidate devices, each of the candidate devices comprises: a device information generating unit for generating device information of each of the candidate devices; a wireless transmission interface; and a wireless transmission device for building connection with the candidate devices through the wireless transmission interface, wherein the wireless transmission device comprises: a storage unit for storing information to be transmitted; a transmission direction information generating unit for generating transmission direction information, wherein the transmission direction information generating unit comprises: a direction input unit for imputting transmission direction; and a geomagnetic sensor for sensing present geomagnetic direction relative to the wireless transmission device, wherein the transmission direction information comprises information of the transmission direction and the present geomagnetic direction relative to the wireless transmission device; and a processing unit, electrically connected with the storage unit and the transmission direction information generating unit, wherein the processing unit comprises: a candidate device information receiving module for receiving the information of each of the candidate devices from each of the candidate devices respectively through the wireless transmission interface; a direction range calculating module for calculating transmission direction range according to the transmission direction information, wherein the direction range calculating module calculates the transmission direction range according to the transmission direction and the present geomagnetic direction relative to the wireless transmission device; a selecting module for selecting at least one of the candidate devices, device information of which matches the transmission direction range, wherein the selected at least one candidate device is taken as at least one transmission target device; and an information transmitting module, transmitting the information to be transmitted to the transmission target device through the wireless transmission interface.