Positional information transmission system, positional information transmitter, and positional information transmitting method

A positional information transmission device, comprising:

• a close-range wireless communication unit configured to perform close-range wireless communication with a network transceiver and a second positional information transmission device, the close-range wireless communication unit being configured to,
• receive, via the network transceiver, first positional information from a server configured to store a table mapping between (i) specific device identification information, (ii) positional information, and (Hi) position coordinate information for each positional information transmission device, wherein the first positional information is generated by the server and comprises first temporary identification information associated with first specific device identification information and first position coordinate information of the positional information transmission device stored in the table managed by the server,
• determine second positional information, comprising second temporary identification information for the second positional information transmission device, based on the received first positional information comprising the first temporary identification information, and
• transmit the determined second positional information comprising the second temporary identification information to the second positional information transmission device, and to the server via the network transceiver, with an instruction for the server to associate the second temporary identification information with second specific device identification information and second position coordinate information of the second positional information transmission device in the table managed by the server;
• and
• a sonic wave generation unit configured to,
• generate a sonic signal based on the received first positional information comprising the first temporary identification information associated with the first specific device identification information and the first position coordinate information of the positional information transmission device, and
• transmit the sonic signal, the received first positional information comprising the first temporary identification information being extractable from the sonic signal and usable by a positional information usage device that receives the sonic signal to acquire the first position coordinate information of the positional information transmission device from the server, and to determine a current position of the positional information usage device within a geographical coordinate system based on the first position coordinate information acquired from the server.

A method of transmitting positional information, the method comprising:

• receiving, at a first positional information transmission device via a network transceiver, first positional information from a server configured to store a table mapping between (i) specific device identification information, (ii) positional information, and (iii) position coordinate information for each positional information transmission device of a plurality of positional information transmission devices, wherein the first positional information is generated by the server and comprises first temporary identification information associated with first specific device identification information and first position coordinate information of the first positional information transmission device stored in the table managed by the server, by performing close-range wireless communication with the network transceiver;
• determining, by the first positional information transmission device, second positional information, comprising second temporary identification information for a second positional information transmission device of the plurality, based on the received first positional information comprising the first temporary identification information;
• transmitting, by the first positional information transmission device, the determined second positional information comprising the second temporary identification information to the second positional information transmission device, and to the server via the network transceiver, using the close-range wireless communication, with an instruction for the server to associate the second temporary identification information with second specific device identification information and second position coordinate information of the second positional information transmission device in the table managed by the server;
• generating, by the first positional information transmission device, a sonic signal based on the received first positional information comprising the first temporary identification information associated with the first specific device identification information and the first position coordinate information of the first positional information transmission device;
• and
• transmitting, by the first positional information transmission device, the sonic signal, the received first positional information comprising the first temporary identification information being extractable from the sonic signal and usable by a positional information usage device that receives the sonic signal to acquire the first position coordinate information of the first positional information transmission device from the server, and to determine a current position of the positional information usage device within a geographical coordinate system based on the first position coordinate information acquired from the server.