Patent ID: 9007176
Filing Date: 2015-04-14
Classification: G06K

Abstract:
1. A portable electronic apparatus which generates a random number and makes a response at a timing associated with the generated random number, the portable electronic apparatus comprising: a reception unit which receives an initial response request from an external device; a recognition unit which recognizes a total timeframe number set in the external device based on the initial response request received by the reception unit; a random number generation unit which generates a random number; a communication detection unit which detects communication performed in another portable electronic apparatus; a determination unit which monitors one timeframe by using the communication detection unit based on the total timeframe number recognized by the recognition unit and the random number generated by the random number generation unit, and determines whether a response to the initial response request is to be transmitted to the external device based on a detection result obtained by the communication detection unit; a transmission unit which transmits the response to the external device based on a determination result obtained by the determination unit; and a timeframe selection unit which selects a timeframe based on the total timeframe number recognized by the recognition unit and the random number generated by the random number generation unit; wherein, when a relationship of m>n/2 is satisfied, the determination unit reselects a timeframe associated with a number n−m+1, where n is the total timeframe number set by the external device and m is a number of the timeframe selected by the timeframe selection unit, monitors the timeframe reselected by the communication detection unit and determines whether a response to the initial response request is to be transmitted to the external device based on a detection result obtained by the communication detection unit.