Patent ID: 8479059

Claim:
A radio communication device comprising: a control unit that controls to prepare for data loss during radio communication of transmission data; and a transmission unit that transmits the transmission data by radio to another radio communication device according to the control of the control unit, wherein one of the radio communication device and the other radio communication device comprises: a reception unit configured to receive a radio signal from the other ratio communication device; a measurement unit configured to measure a field intensity and an associated noise component from the received radio signal; a judgment unit configured to judge whether the noise component satisfies a certain requirement; and an estimation unit configured to estimate a distance between the radio communication device and the other radio communication device based on the field intensity whose corresponding noise component satisfies the certain requirement, and wherein the control unit performs a control of a content according to the estimated distance, and wherein the estimation unit: calculates an average value of a plurality of field intensities of the radio signals which are judged to satisfy the certain requirement by the judgment unit, judges whether the average value is included in any one of classified average value ranges, and estimates that the distance from the other radio communication device is a distance corresponding to the average value range to which the average value is included.