# US 2014/0194140 A1 · Communication terminal, position management system, and communication method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0194140 A1 - Document ID: US20140194140A1 - Status: Published application - Kind: A1 - Application number: 14/108,461 - Filed: 2013-12-17 - Published: 2014-07-10 - Earliest claimed: 2013-01-08 - Assignees: Ricoh Company, Ltd. - Inventors: Satoshi TAKANO - Web page: https://patentgrep.com/patent/US20140194140A1 ## CPC - G01S 19/11: wherein the cooperating elements are pseudolites or satellite radio beacon positioning system signal repeaters - G01S 19/48: by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system - G01S 19/49: whereby the further system is an inertial position system, e.g. loosely-coupled - H04W 4/027: {using movement velocity, acceleration information} - H04W 4/029: Location-based management or tracking services - Y02D 30/70: in wireless communication networks - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A communication terminal includes a receiving unit configured to receive position information that has been transmitted from a transmission device for transmitting predetermined position information; a detecting unit configured to detect a change in an acceleration applied to the communication terminal; a movement detecting unit configured to detect a movement of the communication terminal based on the position information and information expressing the change in the acceleration; and a sending unit configured to send the position information to the transmission device, when the movement is detected. ## Claims ### Claim 1 A communication terminal comprising: a receiving unit configured to receive position information that has been transmitted from a transmission device for transmitting predetermined position information; a detecting unit configured to detect a change in an acceleration applied to the communication terminal; a movement detecting unit configured to detect a movement of the communication terminal based on the position information and information expressing the change in the acceleration; and a sending unit configured to send the position information to the transmission device, when the movement is detected. ### Claim 2 (depends on 1) The communication terminal according to claim 1, wherein the movement detecting unit detects the movement of the communication terminal, when position information newly received by the receiving unit after the detecting unit detects the change in the acceleration, is different from position information acquired before the detecting unit detects the change in the acceleration. ### Claim 3 (depends on 1) The communication terminal according to claim 1, wherein the sending unit sends the position information to the transmission device, when position information newly received by the receiving unit after the detecting unit detects the change in the acceleration, is position information expressing a predetermined position. ### Claim 4 (depends on 1) The communication terminal according to claim 1, wherein the sending unit sends the position information received by the receiving unit, when the communication terminal is activated. ### Claim 5 (depends on 1) The communication terminal according to claim 1, wherein the receiving unit further receives a positioning signal sent from a GPS satellite, and the sending unit does not send, to the transmission device, position information obtained based on the positioning signal. ### Claim 6 A position management system comprising: a communication terminal; and a position information management system, wherein the communication terminal includes a receiving unit configured to receive position information that has been transmitted from a transmission device for transmitting predetermined position information, a detecting unit configured to detect a change in an acceleration of the communication terminal, a movement detecting unit configured to detect a movement of the communication terminal based on the position information and information expressing the change in the acceleration, and a sending unit configured to send the position information to the transmission device, when the movement is detected, wherein the position information management system is configured to communicate with the communication terminal via a gateway, and to manage the position information sent from the sending unit of the communication terminal. ### Claim 7 (depends on 6) The position management system according to claim 6, wherein the position information management system calculates a possible drive time of the communication terminal by using information expressing a frequency of receiving the position information. ### Claim 8 (depends on 7) The position management system according to claim 7, wherein the position information management system issues a notification message to an administrator of the communication terminal, when the possible drive time becomes less than or equal to a predetermined value. ### Claim 9 A communication method executed by a communication terminal, the communication method comprising: receiving position information that has been transmitted from a transmission device for transmitting predetermined position information; detecting a change in an acceleration applied to the communication terminal; detecting a movement of the communication terminal based on the position information and information expressing the change in the acceleration; and sending the position information to the transmission device, when the movement is detected.