Communication devices, communication systems, programs

Abstract

To provide a technique that also improves the real-time performance of distance measurement while improving the accuracy of distance measurement.SOLUTION: A communication unit 102 receives a first signal containing information that identifies a tag 200 from the tag 200. A distance measurement unit 140 measures the distance to the tag 200 using a first method based on the first signal received by the communication unit 102. The communication unit 102 executes communication with the tag 200 using a second signal for distance measurement that is different from the first signal. The distance measurement unit 140 measures the distance to the tag 200 using a second method different from the first method based on the second signal that has been used by the communication unit 102 in communication.SELECTED DRAWING: Figure 2

Claims

[Claim 1] A communication unit that receives a first signal containing information identifying the wireless device from the wireless device, or receives the first signal and communicates using a second signal different from the first signal for distance measurement, The system includes a distance measuring unit capable of measuring the distance between the communication unit and the wireless device using a first method based on the first signal received by the communication unit, and measuring the distance using a second method different from the first method based on the second signal. If the first signal includes information for using the first method to measure the distance, the distance measuring unit measures the distance using the first method. A communication device that measures the distance by the second method, where the first signal includes information for using the second method to measure the distance. [Claim 2] A communication unit that receives a first signal containing information identifying the wireless device from a wireless device, or receives the first signal and communicates using a second signal different from the first signal for distance measurement, The system includes a distance measuring unit capable of measuring the distance between the communication unit and the wireless device using a first method based on the first signal received by the communication unit, and measuring the distance using a second method different from the first method based on the second signal. If the first signal includes information indicating that the second signal will not be transmitted, the distance measuring unit measures the distance using the first method. A communication device in which the distance measuring unit measures the distance by the second method, provided that the first signal includes information indicating that the second signal is to be transmitted. [Claim 3] A communication device according to claim 1 or 2, A communication system comprising a wireless device that communicates with the aforementioned communication device. [Claim 4] The wireless device is The wireless device side communication unit that transmits the first signal, The communication system according to claim 3, further comprising a transmission interval changing unit for changing the transmission interval of the first signal. [Claim 5] The wireless device further comprises an operation determination unit for determining operation, The communication system according to claim 4, wherein the transmission interval changing unit changes the transmission interval of the first signal based on the determination result of the operation determination unit. [Claim 6] The communication system according to claim 4, wherein the transmission interval changing unit changes the transmission interval of the first signal based on the instruction signal received by the wireless device side communication unit. [Claim 7] The communication system according to claim 6, wherein the instruction signal received by the wireless device side communication unit includes information relating to an instruction to change the transmission interval. [Claim 8] The communication system according to claim 6, wherein the instruction signal received by the wireless device side communication unit is transmitted from the communication device. [Claim 9] The wireless device further comprises a timing unit, The communication system according to claim 4, wherein the transmission interval changing unit changes the transmission interval of the first signal based on information from the timing unit. [Claim 10] The wireless device further comprises a distance measurement count measurement unit that measures the number of measurements by the second method, The communication system according to claim 4, wherein the transmission interval changing unit changes the transmission interval of the first signal based on information from the distance measurement count measurement unit. [Claim 11] A communication step of receiving a first signal containing information identifying the wireless device from a wireless device, or receiving the first signal and communicating with a second signal different from the first signal for distance measurement, The system includes a distance measuring step that enables the measurement of the distance to the wireless device using a first method based on the received first signal, and the measurement of the distance to the wireless device using a second method different from the first method based on the second signal. If the first signal includes information for using the first method to measure the distance, the distance measurement step measures the distance using the first method. If the first signal includes information for using the second method to measure the distance, the distance measurement step is a program that causes a computer to measure the distance using the second method. [Claim 12] A communication step of receiving a first signal from a wireless device which contains information that identifies the wireless device, or receiving the first signal and communicating with a second signal different from the first signal for distance measurement, The system includes a distance measuring step that enables the measurement of the distance to the wireless device using a first method based on the received first signal, and the measurement of the distance to the wireless device using a second method different from the first method based on the second signal. If the first signal includes information indicating that the second signal will not be transmitted, the distance measurement step measures the distance using the first method. If the first signal includes information indicating that the second signal is to be transmitted, the distance measurement step is a program that causes a computer to measure the distance using the second method.

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