Data transmission terminal, agent program, location estimation system and location estimation method

摘要

A data transmission terminal used in a location estimation system including a plurality of communication terminals and a management server connected to a wired network and adapted to estimate a location of each of the plurality of communication terminals and then registering and managing location data of the communication terminal, the communication terminal serving as agent means by executing an installed agent program, the agent means comprising: a connection judging unit that performs: checking a network connection state of the communication terminal, and judging whether the data transmission terminal Terminal device connected to the wired network; a terminal data transmitting unit that, when the data transmission terminal is found to be connected to the wired LAN, performs: transmitting terminals Identification data comprising a network address of the communication terminal assigned by an address assignment unit to the management server, and causing the management server to generate location data of the communication terminal based on the network address and the location data associated with registering and managing the terminal ID data; a data transfer mode changing unit that, after receiving a mode change instruction from the management server, enters a data transfer mode for performing wireless data transfer directly with another of the data terminal terminals, the data transfer terminal causing a switch to the data transfer mode and serving as a Pseudo Access Point (PAP); a carrier wave transmission unit that transmits a carrier wave to which the terminal identification data of the communication terminal has been added as PAP n; an intensity measuring unit which, when the data transmission terminal is found not to be connected to the wired network, measures an intensity of a carrier wave transmitted by another of the data transmission terminals serving as PAP and the terminal identification data the other data transmission terminal have been added; anda measurement result transmitting unit that performs: sending the measured intensity together with the terminal identification data of the other communication terminal serving as PAP to the management server, and causing the management server to store data of the communication terminal using the location data estimating and managing the estimated location data in association with the terminal identification data of the communication terminal, and upon receiving the mode change command from the management server, in to change a data transmission mode for performing wireless data transmission via an access point connected to the wired network, the data transmission mode changing unit causes the data transmission terminal to change to the data transmission mode and to be non-PAP serve.