Patent ID: 8031653

Claim:
A wireless communication device comprising: wireless transmitting means configured to perform communication using one of a plurality of predetermined wireless transmission methods; distance measuring means configured to measure a distance between the wireless communication device and a communication partner device; transmission method sorting means configured to sort out one or more suitable wireless transmission methods from the plurality of wireless transmission methods on the basis of the distance measured by the distance measuring means; link quality determining means configured to determine a link quality of the communication; and wireless transmission method determining means configured to determine the wireless transmission method to be employed by the wireless transmitting means according to the link quality from the wireless transmission methods sorted by the transmission method sorting means; wherein the link quality determining means determines the link quality using radio field intensity; the wireless transmission method determining means includes candidate transmission method choosing means configured to choose one or more candidate wireless transmission methods to be employed by the wireless transmitting means on the basis of the radio field intensity, and transmission method selecting means configured to select one wireless transmission method to be employed by the wireless transmitting means, wherein the selected wireless transmission method is included in the wireless transmission methods sorted by the transmission method sorting means and is also included in the candidate transmission methods; the transmission method sorting means sorts out one or more selectable wireless transmission methods and a quasi-selectable wireless transmission method as the suitable wireless transmission methods, and the transmission method selecting means selects the candidate as the wireless transmission method to be employed by the wireless transmitting means if the candidate is the selectable wireless transmission method, whereas the transmission method selecting means selects the wireless transmission method requiring the lowest radio field intensity from the selectable wireless transmission methods if the candidate is the quasi-selectable wireless transmission method.