Rfid tag reading device, rfid tag reading program, and rfid tag reading method

A non-transitory computer readable medium storing a program executed by operation means in an RFID tag reading device, the RFID tag reading device comprising:

• the operation means;
• storage means for storing a program;
• and an antenna that communicates with a wireless tag, the program comprising:
• a response request signal generation step of generating a response request signal for the wireless tag, and providing the response request signal to the wireless tag via the antenna;
• a response reception step of extracting an ID of the wireless tag and detecting a signal collision of a response from the wireless tag, based on a response signal output from the wireless tag in response to the response request signal;
• a reading result acquisition step of acquiring a read tag number indicating the number of wireless tags from which the corresponding ID has been successfully read;
• a collision occurrence status acquisition step of counting the number of time slots in which the signal collision has occurred and calculating the number of collisions;
• and
• a reading result complementation step of estimating the number of readable wireless tags based on the read tag number and the number of collisions.

An RFID tag reading method in an RFID tag reading device, the RFID tag reading device comprising:

• an antenna that communicates with a wireless tag;
• and RFID reading processing means for reading an RFID of the wireless tag based on a radio signal transmitted and received via the antenna, the RFID tag reading method comprising:
• generating a response request signal for the wireless tag, and providing the response request signal to the wireless tag via the antenna;
• extracting an ID of the wireless tag and detecting a signal collision of a response from the wireless tag, based on a response signal output from the wireless tag in response to the response request signal;
• acquiring a read tag number indicating the number of wireless tags from which the corresponding ID has been successfully read;
• counting the number of time slots in which the signal collision has occurred and calculating the number of collisions;
• and
• estimating the number of readable wireless tags based on the read tag number and the number of collisions.