Position detection system

A position detection system comprising:

• a responder configured to be carried by a user;
• interrogators arranged at a room entrance of each floor and at a plurality of specific places in a room, and
• a position detection unit configured to detect a floor at which the user exists and a position in a room of each floor at which the user exists,
• wherein each of the interrogators comprises:
• an interrogator transmission unit configured to transmit interrogator identification information, which is determined by the room entrance of each floor or the place in the room at which the interrogator is provided, and floor identification information, which is determined by a floor at which the interrogator is provided, when the place at which the interrogator is provided is the room entrance, and
• an interrogator reception unit configured to receive user identification information and the floor identification information from the responder and to transmit the user identification information and the interrogator identification information to the position detection unit when the received floor identification information coincides with the floor identification information of the interrogator and not to transmit any information when the information does not coincide with each other,
• wherein the responder comprises:
• a responder reception unit configured to receive both the interrogator identification information and the floor identification information or only the interrogator identification information from the interrogator,
• a current floor identification information storage unit configured to store therein the floor identification information when the interrogator identification information and the floor identification information are received from the interrogator, and
• a responder transmission unit configured to, when only the interrogator identification information is received from the interrogator, transmit the user identification information to the interrogator in a case where the floor identification information stored in the current floor identification information storage unit coincides with the received floor identification information, and is configured to not transmit the user identification information in a case where the floor identification information stored in the current floor identification information storage unit does not coincide with the received floor identification information, and
• wherein the position detection unit comprises a position determination unit configured to detect that a position in the room of the floor, at which the user exists, is adjacent to the interrogator, based on the interrogator identification information and user identification information received from the interrogator.